2024/11/01 更新

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写真a

マツダ カズキ
松田 和貴
MATSUDA KAZUKI
所属
工学研究院 海洋システム工学部門 准教授
工学部 船舶海洋工学科(併任)
工学府 船舶海洋工学専攻(併任)
職名
准教授
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学位

  • 博士(工学)

研究テーマ・研究キーワード

  • 研究テーマ:新接合技術を用いた既存の大型溶接構造物の強度信頼性に関する検討

    研究キーワード:Al合金,レーザ溶接,ウォブリング,AM技術,WAAM

    研究期間: 2023年6月 - 2024年5月

  • 研究テーマ:材料の強度,破壊,接合に関する研究

    研究キーワード:材料,強度,破壊,疲労,接合

    研究期間: 2022年7月

受賞

  • 論文奨励賞

    2024年4月   一般社団法人溶接学会   一般溶接用鋼における大ひずみ領域での繰返し真応力真ひずみ関係

  • 論文賞

    2022年5月   日本材料学会疲労部門委員会   Observation of fatigue microcracks and estimation of fatigue strength of a thin sheet arc welded part considering micro-ripples

  • 若手優秀講演賞

    2014年11月   船舶海洋工学会   せん断型から開口型に至る疲労き裂成長履歴推定手法の実験的検証

論文

  • デジタル画像相関法を用いた両振り塑性域寸法の 測定精度向上に向けた検討

    アキノトーレスルイス,村上幸治,松田和貴, 後藤浩二

    溶接学会九州支部講演論文集   ( 21 )   1 - 4   2024年11月

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    記述言語:日本語   掲載種別:研究論文(研究会,シンポジウム資料等)  

  • WAAM 方式による金属積層造形技術確立に向けた基礎検討

    井上雄介,松田和貴,後藤浩二,寺崎秀紀

    溶接学会九州支部講演論文集   ( 21 )   9 - 12   2024年11月

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    記述言語:日本語   掲載種別:研究論文(研究会,シンポジウム資料等)  

  • 構造用接着剤の船体防振カーリング接合への適用に関する基礎研究

    松田吉平,鬼塚博之,村上幸治,松田和貴,後藤浩二

    溶接学会九州支部講演論文集   ( 21 )   5 - 8   2024年11月

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    記述言語:日本語   掲載種別:研究論文(研究会,シンポジウム資料等)  

  • A study on laser-arc hybrid welding of butt welded joints of steel plates for hulls under the condition of I-gap with zero initial gap 国際誌

    Hiroo Kobayashi, Tomoya Uchimura, Akihiro Ide, Kazuki Matsuda, Koji Gotoh

    Proceedings of The 37th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM 2024)   502 - 509   2024年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    Laser-arc hybrid welding (LAHW) can significantly reduce weld deformation due to the lower heat input compared to conventional arc welding, which is the standard method used in the current hull construction stages. Because of its superior heat concentration, LAHW has a relatively larger plate thicknesses over which I-shaped groove joints can be fabricated than conventional arc welding.
    One of authors reported that one-pass welding without backing material was possible for a 17 mm thick steel plate with I-shaped groove. However, it was necessary to insert a filler gauge into the groove face and set the gap across the weld line to 0.5 mm.
    From the viewpoint of introducing LAHW into the construction stage of general merchant ships, this study examined the welding work conditions to fabricate sound welded joints by LAHW under the following conditions: (1) groove fabrication by plasma cutting and (2) I-shaped groove with zero initial gap width. With reference to our previous studies, a search was conducted for welding parameters (laser power, arc current and voltage, etc.) that would allow the joint to be fabricated by a single pass of construction. As a result, although welding conditions with good bead appearance were identified, hot cracking of the weld metal occurred in some of the joints. To prevent hot cracking, the number of welding passes was changed from one to two, the length of the molten pool formed in the first pass was shortened in the thickness direction, and the second pass was performed by arc welding alone to compensate for the insufficient reinforcement height. As a result, it was possible to fabricate welded joints with good bead appearance without hot cracking.

  • Study on improvement of measurement accuracy of alternating plastic zone using the digital image correlation method 国際誌

    Luis Aquino Torres, Kouji Murakami, Kazuki Matsuda, Koji Gotoh

    Proceedings of The 37th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM 2024)   494 - 501   2024年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    It is known that fatigue crack growth behavior is dominated by cyclic plastic behavior near the crack tip. The purpose of this study is to improve the accuracy of measuring the dimensions of the alternating plastic region, which is the region where tensile and compressive plastic deformation overlap near the crack tip, using digital image correlation (DIC) method. To measure the dimensions of the alternating plastic region, fatigue crack propagation tests were conducted under two stress ratios using compact specimen (C(T) in ASTM E399). Two methods were employed to print speckle-patterns on the specimen surface for strain field measurement using the DIC method as analytical markers: (1) sprayed on the specimen surface with white and black ink, and (2) 3% nital etching solution was applied. To measure the alternating plastic zone (ῶ) under cyclic loading conditions, a high-speed camera was used to capture the strain fields near the crack tip under cyclic loading. To determine the dimensions of the alternating plastic zone, strain fields obtained from the results of the DIC method were analyzed. The elasto-plastic FE analysis was conducted to compare the results with DIC measurement. As the results, good agreement has been obtained in the low stress ratio condition rather than high stress ratio condition with the FE analysis.

  • Basic research on the use of structural adhesives for the installation of anti-vibration curling to suppress local hull vibration 国際誌

    Kippei Matsuda, Hiroyuki Onizuka, Koji Murakami, Kazuki Matsuda, Koji Gotoh

    Proceedings of The 37th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM 2024)   518 - 524   2024年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    In the process of constructing the hull, additional anti-vibration measures are sometimes required during the commissioning phase after construction. However, the current process of installation involves welding, which results in paint burning and requires additional repair works to be painted. Therefore, the use of structural adhesives, which are a joining method that does not cause paint burning, is expected to replace welding.
    In this study, as a basic study for the use of structural adhesives instead of welding for joining vibration isolation curling members, the joint strength under static three-point bending loading was compared with that of welded joints by experiments and finite element (FE) analysis. In these experiments, four types of specimens were prepared: an arc-welded joints (leg length of 5 mm) and three types of adhesives joints (adhesives thickness of 0.5 mm, 3 mm, and 5 mm) to not only compare welded joints with adhesives joints, but also to examine difference in strength due to the thickness of adhesives layer. The experimental results showed that all of the adhesives joints broke at lower loads than the arc-welded joints, but the adhesives joints also have sufficiently improved bending stiffness compared to the main plate alone and have not ruptured under the designed load. It was confirmed that the thinner the adhesives layer thickness, the greater bond strength. In the FE analysis, the interface region was defined in between steel and adhesives sections. It was confirmed that the elastic deformation before peeling could be simulated by applying appropriately material properties to each section. On the other hand, the adhesives modeling needs to be improved to estimate the peeling behavior and local strain distribution in vicinity of the adhesives part accurately.

  • ウィービング溶接による亜鉛めっき鋼板の気孔抑制 その1

    松葉 正寛, 石田 欽也, 児玉 真二, 松田 和貴

    溶接学会全国大会講演概要   2024s ( 0 )   4 - 5   2024年3月

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    記述言語:日本語   出版者・発行元:一般社団法人 溶接学会  

    DOI: 10.14920/jwstaikai.2024s.0_4

    CiNii Research

  • Cyclic true stress true strain relation in the large strain region of common steel for welded structures 査読 国際誌

    Matsuda, K; Shimoka, T; Murakami, K; Uchimura, T; Gotoh, K

    WELDING INTERNATIONAL   38 ( 3 )   239 - 248   2024年3月   ISSN:0950-7116 eISSN:1754-2138

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    記述言語:英語   出版者・発行元:Welding International  

    Cyclic true stress - true strain curves were obtained using general-purpose shipbuilding steel in the large strain region. Test methods are incremental step test and static tensile test after cyclic loading. The stress–strain curves for static and cyclic loading were compared to investigate the cause of the difference between each other. A simple method for estimating the cyclic stress-strain curves was proposed. The diameter and curvature of the smallest cross-section of the specimen were measured using telecentric measurement device, and the true stress - true strain curve was obtained using the Bridgman correction method. Using the measurement method, cyclic stress-strain diagrams were obtained in the region where the true strain exceeded 1% by performing cyclic tensile tests using the incremental step method and static tensile tests after cyclic loading. The influence of the test method and maximum displacement conditions on the cyclic stress-strain curve was small within the scope of this study. There was little difference in the elongation between the static tensile test and the static tensile test after cyclic loading. The difference in yield stress between static and cyclic loading was discussed in terms of macro-yield mechanisms at intergranular and transgranular. A simple method for estimating cyclic stress-strain curves from a static stress-strain curve was proposed. The specimens used in this study are general-purpose shipbuilding steels, and the results should be applicable to similar steels for welding and structures.

    DOI: 10.1080/09507116.2023.2282231

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  • 3. 薄鋼板GMA溶接部の微小疲労亀裂の観察,薄鋼板重ね隅肉GMA溶接部の残留応力に及ぼす鋼板,ワイヤ強度の影響 招待

    松田 和貴, 児玉 真二

    溶接学会誌   93 ( 5 )   300 - 300   2024年   ISSN:00214787 eISSN:18837204

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    記述言語:日本語   出版者・発行元:一般社団法人 溶接学会  

    DOI: 10.2207/jjws.93.300

    CiNii Research

  • Study on fabrication of butt welded joints of thick plates by laserarc hybrid welding in horizontal position

    TSURUOKA Toshiki, NAKADA Tomoya, UCHIMURA Tomoya, MATSUDA Kazuki, GOTOH Koji

    Proceedings of The 36th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM 2023)   79 - 85   2023年10月

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    記述言語:英語  

    Laser-arc hybrid welding (LAHW) is an advanced welding process that combines arc and laser welding as one molten pool. Compared with conventional arc welding, LAHW can be performed higher welding speeds with narrower grooves, and weld deformation can be significantly reduced. When LAHW is applied to construction of structural members, the welding is generally performed in a flat position because it is automatic welding system is applied from the viewpoint of safety in the work environment. / Flat position (PA), it is expected to be applied to many welds of large steel structures by applying LAHW to horizontal position. However, the application of LAHW in the construction of large structures is expected by expanding the applicable welding position. / In this study, butt joints with a plate thickness of 20 mm were fabricated in the horizontal position (PC) as a target of welding position in LAHW. By trial and error, referring to the welding conditions in the flat position, the welding conditions that produced a sound weld bead appearance were derived. However, molten metal was sagging at some of lower weld bead edge of the front bead. A sliding jig was designed to prevent the front bead sagging. As a result, the sagging was prevented and it was expected that the jig was effective in relaxing the shape of the weld toe for improving the fatigue strength of the joint. / In the construction stages of large structures, it is difficult to maintain a constant root gap over the entire length of the weld line, so it is desirable to extend the allowable range of the initial gap. Therefore, we attempted to process with an initial root gap of 1.5 mm. However, we were unable to find welding conditions that would avoid undercutting and melting-in, and confirmed that the applicable limit of the initial root gap is 1.0 mm for the construction method studied in this study.

    CiNii Research

  • Numerical simulation of fatigue crack growth with stress-strain relationship under cyclic loading

    SHIMOOKA Tsukasa, MURAKAMI Koji, MATSUDA Kazuki, GOTOH Koji

    Proceedings of The 36th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM 2023)   122 - 128   2023年10月

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    記述言語:英語  

    In numerical simulations of fatigue crack propagation, the true stress-true strain relationship under cyclic loading should be considered, but in simulations modelling crack opening behaviour, the stress-strain relationship of the material is regarded as rigid plastic or isotropically hardened elastic-plastic material from the point of view of model simplification. / In this study, the true stress-true strain relationship under cyclic loading, estimated from the true stress-true strain relationship under monotonic tensile loading, is implemented in fatigue crack propagation simulations of work-hardened materials proposed by some of authors. / Fatigue crack growth curves under the following three loadings, (1) constant cyclic loading under different stress ratios, (2) two-stage block loading cycles, (3) constant cyclic loading with a spike load, were estimated and compared with the measured results obtained in previous studies. / The results show that the accuracy of the fatigue crack growth estimation is better than the conventional stress-strain relationship assuming elastic-perfectly plastic materials.

    CiNii Research

  • Improvement of Fatigue Strength of Welded Joints by Grain Refinement Using Laser Irradiation and Locally Carburized

    TERATSUJI Kazutaka, UCHIMURA Tomoya, MATSUDA Kazuki, GOTOH Koji

    Proceedings of The 36th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM 2023)   63 - 70   2023年10月

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    記述言語:英語  

    The purpose of this paper is to confirm fatigue strength of welded joints can be improved by grain refinement using laser irradiation and localized carburization considering corrosion and abrasion. / Comparing measured temperature history of laser irradiation with theoretical solutions of moving heat source and instantaneous line heat source, and effective temperature range of grain refinement are investigated. Only moving heat source agreed with the measured values. Maximum temperature and time required from 800 ℃ to 500 ℃ (Δt8/5) of the grain refinement region are obtained by applying moving heat source. It is reasonable based on the theory of phase transformation. / Four-point bending fatigue tests were conducted on T-joint specimens as welded, laser irradiated, and locally carburized. As a result, number of cycles to failure of the specimens which locally carburized and laser irradiated were equivalent and they are longer than that of the specimens as-welded. The main reason is locally carburized and laser irradiated had more gentler toe shapes than as-welded. However, the porosity was observed in the carburized specimen. It can affect fatigue strength, further improvement of fatigue strength was expected by eliminating it.

    CiNii Research

  • Effect of strength of steel sheets on tensile shear strength and failure mode of dissimilar joint of spot welds 査読 国際誌

    Okada, T; Ueda, H; Matsuda, K; Miyazaki, Y; Yasuyama, M; Fujii, H

    WELDING INTERNATIONAL   37 ( 5 )   282 - 294   2023年5月   ISSN:0950-7116 eISSN:1754-2138

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    記述言語:英語   出版者・発行元:Welding International  

    Advanced high strength steel sheet (AHSS) is widely used in the automotive body for weight reduction and the improvement of crash performance. For example, TS1500 MPa class hot stamped steel (1500HS steel) sheet is applied to many vehicle models. However, there is a concern that performance of spot welded joints will decline as steel strength increases. In order to further expand the application of AHSS, it is very important to have knowledge about the characteristics of spot welded joints. In this report, we investigated the tensile shear strength (TSS) of the 1500HS steel sheet. Then, we compared the joint strength and failure position of the same kind material joints and the dissimilar material joints with the 1500HS steel sheet in case of the plug failure. As a result, it was found that TSS of dissimilar material joints depend on base metal strength on lower strength steel side. However, fracture occurred on the 1500HS steel side except for joints with large difference of base metal strength. The mechanism is thought that the effect of strain concentration at the edge of nugget on the 1500HS steel side due to the increase of rotational deformation around the nugget.

    DOI: 10.1080/09507116.2023.2202949

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  • Fatigue strength improvement method for thin sheet GMA welding joints by weaving 招待 査読 国際誌

    Matsuda, K; Ishida, Y; Kodama, S

    WELDING IN THE WORLD   67 ( 3 )   733 - 739   2023年3月   ISSN:0043-2288 eISSN:1878-6669

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    記述言語:英語   出版者・発行元:Welding in the World  

    A method for improving the fatigue strength of thin steel sheet gas metal arc (GMA)-welded joints using weaving welding was evaluated. Weaving created peaks and valleys at the weld toe. The valley has high stress triaxiality, and plastic deformation is unlikely to occur. Fatigue cracks occurred from the peaks with gentle toe shapes. Therefore, it is considered that the fatigue strength is improved by reducing the initiation points of the crack and stress concentration at the toe. The fatigue test results showed that the fatigue limit of the weaving welding joint was improved compared with that of the normal welding joint. Furthermore, the optimal weaving condition, which is the relationship between the weaving wavelength and torch swing amplitude, was evaluated. As a consequence, when the wave density is small, the crack initiation point is not restricted to the peak. On the other hand, when the wave density is large, the peak and valley shapes merge and the weaving effect disappears. In addition, undercuts occurred when the swing amplitude became too large. The mechanism of improving the fatigue strength was considered by observing the initiation point of the fatigue microcracks.

    DOI: 10.1007/s40194-023-01480-z

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  • 一般溶接用鋼における大ひずみ領域での繰返し真応力真ひずみ関係

    松田 和貴, 下岡 司, 村上 幸治, 内村 友哉, 後藤 浩二

    溶接学会論文集   41 ( 3 )   217 - 224   2023年   ISSN:02884771 eISSN:24348252

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    記述言語:日本語   出版者・発行元:一般社団法人 溶接学会  

    Cyclic true stress - true strain curves were obtained using general-purpose shipbuilding steel in the large strain region. Test methods are incremental step test and static tensile test after cyclic loading. The stress-strain curves for static and cyclic loading were compared to investigate the cause of the difference between each other. A simple method for estimating the cyclic stress-strain curves was proposed. The diameter and curvature of the smallest cross-section of the specimen were measured using telecentric measurement device, and the true stress - true strain curve was obtained using the Bridgman correction method. Using the measurement method, cyclic stress-strain diagrams were obtained in the region where the true strain exceeded 1% by performing cyclic tensile tests using the incremental step method and static tensile tests after cyclic loading. The influence of the test method and maximum displacement conditions on the cyclic stress-strain curve was small within the scope of this study. There was little difference in the elongation between the static tensile test and the static tensile test after cyclic loading. The difference in yield stress between static and cyclic loading was discussed in terms of macro-yield mechanisms at intergranular and transgranular. A simple method for estimating cyclic stress-strain curves from a static stress-strain curve was proposed. The specimens used in this study are general-purpose shipbuilding steels, and the results should be applicable to similar steels for welding and structures.

    DOI: 10.2207/qjjws.41.217

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  • Investigation of fatigue strength of root of lap fillet welds of thin sheet and improvement method 査読 国際誌

    Matsuda K., Yonezawa T.

    Theoretical and Applied Fracture Mechanics   122 ( 103667 )   2022年11月   ISSN:01678442

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    記述言語:英語   出版者・発行元:Theoretical and Applied Fracture Mechanics  

    This study investigates the dominant factors of fatigue strength at the root of thin-sheet lap fillet arc welds, which are frequently used in automobile chassis components. A method to improve the root fatigue strength was investigated. The direction of fatigue crack propagation at the root coincided with the direction of maximum circumferential stress range. The circumferential stress was reduced by increasing the distance from the toe to the root (penetration width). Fatigue strength originating from the root was improved in welded joints where the penetration width was increased by adjusting the welding aim point and heat input.

    DOI: 10.1016/j.tafmec.2022.103667

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  • 異強度板組の抵抗スポット溶接継手の引張せん断強さと破断位置に及ぼす材料強度の影響 査読

    岡田 徹, 上田 秀樹, 松田 和貴, 宮崎 康信, 泰山 正則, 藤井 英俊

    溶接学会論文集   40 ( 4 )   216 - 225   2022年11月   ISSN:02884771

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    記述言語:日本語   出版者・発行元:Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society  

    Advanced high strength steel sheet (AHSS) is widely used in the automotive body for weight reduction and the improvement of crash performance. In general, weldability and formability of steel sheet tends to decline as steel strength increases. Hot stamping is a technique that achieves both formability and strength of steel sheet, and TS1500MPa class hot stamped steel sheet is applied to many vehicle models. On the other hand, since the joint strength characteristics of the spot weld are dominated by the melt-solidified zone and weld heat affected zone, there is a concern that performance of spot welded joints will decline as steel strength increases. In other words, in order to further expand the application of AHSS, it is very important to have knowledge about the characteristics of spot welded joints. In this report, we investigated the TSS of the TS1500MPa class hot stamped steel sheet, focusing on the characteristics of tensile shear joints. Then, we compared the joint strength and failure position of the same kind material joints and the dissimilar material joints with the TS1500MPa class hot stamped steel sheet in case of the plug failure. As a result, it was found that TSS of dissimilar material joints depend on base metal strength on lower strength steel side. However, fracture occurred on the TS1500MPa class hot stamped steel side except for joints with large difference of base metal strength. The mechanism is thought that the effect of strain concentration at the edge of nugget on the TS1500MPa class hot stamped steel side due to the increase of rotational deformation around the nugget.

    DOI: 10.2207/qjjws.40.216

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  • 機械学習を援用した溶接施工条件および溶接音を入力変数としたすみ肉溶接ビード形状の予測に関する研究

    馮永益, 渡辺範弘, 山嵜賢人, 松田和貴, 後藤浩二

    溶接学会九州支部講演論文集   ( 19 )   41 - 44   2022年9月

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    記述言語:日本語  

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  • 疲労強度改善のためのレーザ照射による結晶粒微細化に関する基礎検討

    寺辻和陸, 内村友哉, 松田和貴, 後藤浩二

    溶接学会九州支部講演論文集   ( 19 )   37 - 40   2022年9月

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    記述言語:日本語  

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  • 繰返し負荷を受ける鋼材の応力~ひずみ関係に関する実験的検討

    下岡 司, 村上 幸治, 松田 和貴, 後藤 浩二

    溶接学会九州支部講演論文集   19   1 - 4   2022年9月

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    記述言語:日本語   出版者・発行元:溶接学会九州支部  

    CiNii Research

  • Effect of the strength of steel sheets and wires on residual stress of thin steel sheet lap-fillet GMA weld joint 査読 国際誌

    Matsuda K., Kodama S.

    Welding International   36 ( 2 )   97 - 113   2022年2月   ISSN:09507116

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    記述言語:英語   出版者・発行元:Welding International  

    Weld residual stress of the lap fillet GMA welding joints which was performed using two strength grades of steel sheets and two strength grades of welding wires were measured. In addition, to consider the effects of steel sheet strength and weld metal strength on welding residual stress, thermal elastoplastic analysis using FEM was carried out for the experiments. As a result of the analysis using the temperature history of the heat-affected zone as a fitting parameter, the residual stress distributions near the toe were in agreement with the measurement in the FE analysis. Comparing the residual stress distributions in the direction perpendicular to the weld line on the weld metal surface near the toe, which is the occurring point of fatigue cracks in the FE analysis results, with the same steel sheet, the higher the weld metal strength the smaller the tensile residual stress. And comparing with the same wire, the higher the steel sheet strength the higher the tensile residual stress. The reason for the former is that when using high-strength wire, cooling transformation occurs at a lower temperature than using low-strength wire. As a result, it is considered that the tensile residual stress was effectively reduced by causing transformation expansion while the surrounding strength was high. The reason for the latter is considered to be that each stress value changes based on the yield stress of the steel sheet and weld metal because the plastic strain continues to occur in each direction until transformation occurs after welding. It was considered that the larger the ratio of the hardness of the weld metal to the base metal, the smaller the ratio of the residual stress of the weld metal near the toe to the yield stress.

    DOI: 10.1080/09507116.2022.2030536

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  • Effect of galvannealed coating on corona bond strength of resistance spot welding 査読 国際誌

    Matsuda K., Kodama S.

    Science and Technology of Welding and Joining   27 ( 2 )   132 - 140   2022年1月   ISSN:13621718

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    記述言語:英語   出版者・発行元:Science and Technology of Welding and Joining  

    The effect of galvannealed (GA) coating on the corona bond strengths of resistance spot welding joints was investigated. A cross tensile test was performed with removal of the nugget, using GA steel sheets and steel sheets whose coating had been removed via pickling. The maximum load with coating was lower than that without coating. When the nugget diameter was small (3√t, t: sheet thickness), GA coating reduced the corona bond strength (MPa). In contrast, when the nugget diameter was large (5√t), GA coating did not change the corona bond strength but reduced the corona bond area.

    DOI: 10.1080/13621718.2021.2023964

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  • 薄鋼板重ね隅肉GMA溶接部の残留応力に及ぼす鋼板,ワイヤ強度の影響 査読

    @松田 和貴, @児玉 真二

    溶接学会論文集   39 ( 3 )   218 - 231   2021年9月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    Weld residual stress of the lap fillet GMA welding joints which was performed using two strength grades of steel sheets and two strength grades of welding wires were measured. In addition, in order to consider the effects of steel sheet strength and weld metal strength on welding residual stress, thermal elastoplastic analysis using FEM was carried out for the experiments. As a result of analysis using the temperature history of the heat-affected zone as a fitting parameter, the residual stress distributions near the toe were in agreement with the measurement in the FE analysis. Comparing the residual stress distributions in the direction perpendicular to the weld line on the weld metal surface near the toe, which is the occurring point of fatigue cracks in the FE analysis results, with the same steel sheet, the higher the weld metal strength the smaller the tensile residual stress. And comparing with the same wire, the higher the steel sheet strength the higher the tensile residual stress. The reason for the former is that when using high-strength wire, cooling transformation occurs at a lower temperature than using low-strength wire. As a results, it is considered that the tensile residual stress was effectively reduced by causing transformation expansion due to while the surrounding strength was high. The reason for the latter is considered to be that the each stress value changes based on the yield stress of the steel sheet and weld metal because the plastic strain continues to occur in each direction until transformation occurs after welding. It was considered that the larger the ratio of the hardness of the weld metal to the base metal, the smaller the ratio of the residual stress of the weld metal near the toe to the yield stress.

    DOI: https://doi.org/10.2207/qjjws.39.218

    その他リンク: https://doi.org/10.2207/qjjws.39.218

  • 薄板アーク溶接部の残留応力に及ぼす鋼板,ワイヤ強度の影響

    @松田和貴, @児玉真二

    溶接学会全国大会講演概要   109   230 - 231   2021年9月

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    記述言語:日本語   掲載種別:研究論文(その他学術会議資料等)  

    DOI: https://doi.org/10.14920/jwstaikai.2021f.0_230

    その他リンク: https://doi.org/10.14920/jwstaikai.2021f.0_230

  • Observation of fatigue microcracks and estimation of fatigue strength of a thin sheet arc welded part considering micro-ripples 査読 国際誌

    @Kazuki Matsuda, @Shinji Kodama

    International Journal of Fatigue   145   2021年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.ijfatigue.2020.106087

    その他リンク: https://doi.org/10.1016/j.ijfatigue.2020.106087

  • 薄板アーク溶接部の微小疲労亀裂の観察(第二報)

    @松田和貴, @児玉真二

    溶接学会全国大会講演概要   164 - 165   2020年9月

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    記述言語:日本語   掲載種別:研究論文(その他学術会議資料等)  

    DOI: https://doi.org/10.14920/jwstaikai.2020f.0_164

    その他リンク: https://doi.org/10.14920/jwstaikai.2020f.0_164

  • 薄鋼板GMA溶接部の微小疲労亀裂の観察 査読

    @松田 和貴, @児玉 真二

    溶接学会論文集   38 ( 3 )   157 - 163   2020年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    Fatigue tests were performed on GMA welded joints using a prototype steel sheets with varying amounts of C. In addition, the origin of the fatigue cracks in the thin steel GMA welded joints were investigated through observation the micro cracks in the specimens that were judged to be not fractured by fatigue limit stress in the fatigue test. As a result of plane bending fatigue test of bead-on-plate welding sheet, fatigue limit of the welded specimen did not differ much between the steel sheets. Observing the specimens which were not fractured at the fatigue limit, micro cracks often occurred at the bottom of the ripples on the weld metal surface and in the ferrite structure. It was founded that fatigue cracks in thin steel sheet GMA welding using mixed gas occurred parallel along the bottom of the ripples and parallel cracks merged with the crack growth, resulting in a zigzag propagation path on the weld joint surface. The effect of ripple on the fatigue limit was predicted by comparing estimating the fatigue limit without considering the ripple with the fatigue limit obtained from experiment. Finally, the effect of ripple on the fatigue limit was more than 10% and less than 20%. And it was implied that higher the strength of the material, the greater the effect of ripple on the fatigue limit.

    DOI: https://doi.org/10.2207/qjjws.38.157

    その他リンク: https://doi.org/10.2207/qjjws.38.157

  • 薄板重ね隅肉継手のルート部の応力解析

    @松田和貴, @児玉真二

    溶接学会全国大会講演概要   226 - 227   2019年9月

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    記述言語:日本語   掲載種別:研究論文(その他学術会議資料等)  

    DOI: https://doi.org/10.14920/jwstaikai.2019f.0_226

    その他リンク: https://doi.org/10.14920/jwstaikai.2019f.0_226

  • Evaluation of corona bond strength of resistance spot welding 査読 国際誌

    @Kazuki Matsuda, @Shinji Kodama

    Science and Technology of Welding and Joining   25 ( 1 )   66 - 72   2019年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1080/13621718.2019.1613010

    その他リンク: https://doi.org/10.1080/13621718.2019.1613010

  • Evaluation of Corona Bond Area Strength of Resistance Spot Welding 国際誌

    @Kazuki MATSUDA, @Shinji KODAMA

    International Symposium on Joining Technologies in Advanced Automobile Assembly 2018   41 - 42   2018年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • 抵抗スポット溶接コロナボンド部の強度評価

    @松田和貴, @児玉真二

    溶接学会全国大会講演概要   240 - 241   2018年9月

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    記述言語:日本語   掲載種別:研究論文(その他学術会議資料等)  

    DOI: https://doi.org/10.14920/jwstaikai.2018f.0_240

    その他リンク: https://doi.org/10.14920/jwstaikai.2018f.0_240

  • 薄板アーク溶接部に生じた微小亀裂の観察

    @松田和貴, @石田欽也, @児玉真二

    溶接学会全国大会講演概要   18 - 19   2017年9月

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    記述言語:日本語   掲載種別:研究論文(その他学術会議資料等)  

    DOI: https://doi.org/10.14920/jwstaikai.2017f.0_18

    その他リンク: https://doi.org/10.14920/jwstaikai.2017f.0_18

  • ビーチマーク試験による薄鋼板の溶接部疲労亀裂の伝播特性評価

    @松田和貴, @石田欽也, @児玉真二, @宮崎康信

    溶接学会全国大会講演概要   368 - 369   2016年9月

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    記述言語:日本語   掲載種別:研究論文(その他学術会議資料等)  

    DOI: https://doi.org/10.14920/jwstaikai.2016f.0_368

    その他リンク: https://doi.org/10.14920/jwstaikai.2016f.0_368

  • 複数周波数成分を有する重畳応力履歴の単一周波数応力履歴への置き換えに関する一考察

    @松田和貴, @後藤浩二

    日本船舶海洋工学会講演会論文集   20   489 - 492   2015年9月

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    記述言語:日本語   掲載種別:研究論文(その他学術会議資料等)  

    DOI: https://doi.org/10.14856/conf.20.0_489

    その他リンク: https://doi.org/10.14856/conf.20.0_489

  • Numerical simulation of fatigue crack propagation under superimposed stress histories containing different frequency components with several mean stress conditions 査読 国際誌

    @Kazuki Matsuda, @Koji Gotoh

    Marine Structures   41   77 - 95   2015年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.marstruc.2014.12.005

    その他リンク: https://doi.org/10.1016/j.marstruc.2014.12.005

  • 平均応力が変動する重畳応力条件下における疲労亀裂伝播挙動解析 査読

    @松田 和貴, @村上 幸治, @後藤 浩二

    日本船舶海洋工学会論文集   20   119 - 125   2014年12月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    Fatigue crack propagation behavior under superimposed loading histories with several mean stress conditions is highlighted.Numerical simulation of fatigue crack propagation based on an advanced fracture mechanics approach using the RPG (Re-tensile Plastic zone Generating) stress criterion for fatigue crack propagation is improved to enable the extraction of the effective loading history for fatigue crack propagation. The parameter, which is based on the plastic hysteresis consuming in the vicinity of a crack tip,is applied to extract the effective loading for fatigue crack propagation and implemented into the numerical simulation code of fatigue crack propagation. Fatigue crack propagation tests under various superimposed loading conditions, which contain several constants and variable mean stress, are performed and comparison of fatigue crack propagation histories obtained from the improved numerical simulations with the measurements is performed. These comparisons show the validity of the proposed procedure for extracting the effective loading history from the superimposed loading histories with different frequencies. Subsequently, practical fatigue strength evaluation based on the linear cumulative fatigue damage parameter were conducted to investigate the tendency of fatigue damage value affected by mean stresses.

    DOI: https://doi.org/10.2534/jjasnaoe.20.119

    その他リンク: https://doi.org/10.2534/jjasnaoe.20.119

  • Numerical Simulation of Fatigue Crack Propagation Under Simulated Whipping Loading Arising in Hull Structures 査読 国際誌

    @Kazuki Matsuda, @Koji Gotoh

    Volume 3: Materials Technology; Ocean Space Utilization, ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2013),   3   2013年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    Numerical Simulation of Fatigue Crack Propagation Under Simulated Whipping Loading Arising in Hull Structures, Kazuki Matsuda, Koji Gotoh, OMAE2013-10985, V003T03A037; 7 pages.

    DOI: https://doi.org/10.1115/OMAE2013-10985

    その他リンク: https://doi.org/10.1115/OMAE2013-10985

  • 複数周波数成分を有する重畳応力条件下における疲労き裂伝播挙動解析 査読

    @後藤 浩二,@松田 和貴

    日本船舶海洋工学会論文集   17   75 - 81   2013年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    Fatigue crack propagation behaviour under superposed loading histories which contain two different frequency components is highlighted. Numerical simulation of fatigue crack propagation based on an advanced fracture mechanics approach using the RPG (Retensile Plastic zone Generating) stress criterion for fatigue crack propagation is improved to enable the extraction of the effective loading history. The critical value of the plastic hysteresis for the stress versus strain relationship occurring in the vicinity of a crack tip is defined as the control parameter for extracting the effective loading history. Comparison of fatigue crack propagation curves obtained from the improved numerical simulations with the measurements under the superposed loading histories is performed. These comparisons show the validity of the proposed procedure for extracting the effective loading history from the superposed loading history containing different frequencies. Besides, the insufficiency of S-N curves approach with the cumulative damage law for the superposed loading history condition containing different frequency components is conducted.

    DOI: https://doi.org/10.2534/jjasnaoe.17.75

    その他リンク: https://doi.org/10.2534/jjasnaoe.17.75

  • Numerical simulation of fatigue crack propagation under superposed loading histories with two different frequencies 査読 国際誌

    HYDROELASTICITY 2012   287 - 297   2012年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    Numerical simulation of fatigue crack propagation under superposed loading histories with two different frequencies, Koji GOTOH,Kazuki MATSUDA,O KITAMURA, Proc. HYDROELASTICITY 2012, pp 287~297

▼全件表示

講演・口頭発表等

  • デジタル画像相関法を用いた両振り塑性域寸法の 測定精度向上に向けた検討

    アキノトーレスルイス,村上幸治,松田和貴,後藤浩二

    溶接学会九州支部研究発表会  2024年11月 

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    開催年月日: 2024年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:福岡県   国名:日本国  

  • WAAM 方式による金属積層造形技術確立に向けた基礎検討

    井上雄介,松田和貴,後藤浩二,寺崎秀紀

    溶接学会九州支部研究発表会  2024年11月 

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    開催年月日: 2024年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:福岡県   国名:日本国  

  • 構造用接着剤の船体防振カーリング接合への適用に関する基礎研究

    松田吉平,鬼塚博之,村上幸治,松田和貴,後藤浩二

    溶接学会九州支部研究発表会  2024年11月 

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    開催年月日: 2024年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:福岡県   国名:日本国  

  • Study on improvement of measurement accuracy of alternating plastic zone using the digital image correlation method 国際会議

    Luis Aquino Torres, Kouji Murakami, Kazuki Matsuda, Koji Gotoh

    The 37th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures  2024年9月 

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    開催年月日: 2024年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Kure, Hiroshima   国名:日本国  

    It is known that fatigue crack growth behavior is dominated by cyclic plastic behavior near the crack tip. The purpose of this study is to improve the accuracy of measuring the dimensions of the alternating plastic region, which is the region where tensile and compressive plastic deformation overlap near the crack tip, using digital image correlation (DIC) method. To measure the dimensions of the alternating plastic region, fatigue crack propagation tests were conducted under two stress ratios using compact specimen (C(T) in ASTM E399). Two methods were employed to print speckle-patterns on the specimen surface for strain field measurement using the DIC method as analytical markers: (1) sprayed on the specimen surface with white and black ink, and (2) 3% nital etching solution was applied. To measure the alternating plastic zone (ῶ) under cyclic loading conditions, a high-speed camera was used to capture the strain fields near the crack tip under cyclic loading. To determine the dimensions of the alternating plastic zone, strain fields obtained from the results of the DIC method were analyzed. The elasto-plastic FE analysis was conducted to compare the results with DIC measurement. As the results, good agreement has been obtained in the low stress ratio condition rather than high stress ratio condition with the FE analysis.

  • A study on laser-arc hybrid welding of butt welded joints of steel plates for hulls under the condition of I-gap with zero initial gap 国際会議

    Hiroo Kobayashi, Tomoya Uchimura, Akihiro Ide, Kazuki Matsuda, Koji Gotoh

    The 37th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures  2024年9月 

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    開催年月日: 2024年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Kure, Hiroshima   国名:日本国  

    Laser-arc hybrid welding (LAHW) can significantly reduce weld deformation due to the lower heat input compared to conventional arc welding, which is the standard method used in the current hull construction stages. Because of its superior heat concentration, LAHW has a relatively larger plate thicknesses over which I-shaped groove joints can be fabricated than conventional arc welding. One of authors reported that one-pass welding without backing material was possible for a 17 mm thick steel plate with I-shaped groove. However, it was necessary to insert a filler gauge into the groove face and set the gap across the weld line to 0.5 mm. From the viewpoint of introducing LAHW into the construction stage of general merchant ships, this study examined the welding work conditions to fabricate sound welded joints by LAHW under the following conditions: (1) groove fabrication by plasma cutting and (2) I-shaped groove with zero initial gap width. With reference to our previous studies, a search was conducted for welding parameters (laser power, arc current and voltage, etc.) that would allow the joint to be fabricated by a single pass of construction. As a result, although welding conditions with good bead appearance were identified, hot cracking of the weld metal occurred in some of the joints. To prevent hot cracking, the number of welding passes was changed from one to two, the length of the molten pool formed in the first pass was shortened in the thickness direction, and the second pass was performed by arc welding alone to compensate for the insufficient reinforcement height. As a result, it was possible to fabricate welded joints with good bead appearance without hot cracking.

  • Basic research on the use of structural adhesives for the installation of anti-vibration curling to suppress local hull vibration 国際会議

    Kippei Matsuda, Hiroyuki Onizuka, Koji Murakami, Kazuki Matsuda, Koji Gotoh

    The 37th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures  2024年9月 

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    開催年月日: 2024年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Kure, Hiroshima   国名:日本国  

    In the process of constructing the hull, additional anti-vibration measures are sometimes required during the commissioning phase after construction. However, the current process of installation involves welding, which results in paint burning and requires additional repair works to be painted. Therefore, the use of structural adhesives, which are a joining method that does not cause paint burning, is expected to replace welding. In this study, as a basic study for the use of structural adhesives instead of welding for joining vibration isolation curling members, the joint strength under static three-point bending loading was compared with that of welded joints by experiments and finite element (FE) analysis. In these experiments, four types of specimens were prepared: an arc-welded joints (leg length of 5 mm) and three types of adhesives joints (adhesives thickness of 0.5 mm, 3 mm, and 5 mm) to not only compare welded joints with adhesives joints, but also to examine difference in strength due to the thickness of adhesives layer. The experimental results showed that all of the adhesives joints broke at lower loads than the arc-welded joints, but the adhesives joints also have sufficiently improved bending stiffness compared to the main plate alone and have not ruptured under the designed load. It was confirmed that the thinner the adhesives layer thickness, the greater bond strength. In the FE analysis, the interface region was defined in between steel and adhesives sections. It was confirmed that the elastic deformation before peeling could be simulated by applying appropriately material properties to each section. On the other hand, the adhesives modeling needs to be improved to estimate the peeling behavior and local strain distribution in vicinity of the adhesives part accurately.

  • ウィービング溶接による亜鉛めっき鋼板の気孔抑制 その1

    松葉 正寛, 石田 欽也, 児玉 真二, 松田 和貴

    2024年度春季全国大会  2024年4月  一般社団法人溶接学会

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    開催年月日: 2024年4月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪大学 中之島センター   国名:日本国  

    DOI: https://doi.org/10.14920/jwstaikai.2024s.0_4

  • Numerical Simulation of Fatigue Crack Growth with Stress-Strain Relationship Under Cyclic Loading 国際会議

    #Tsukasa SHIMOOKA, @Koji MURAKAMI, @Kazuki MATSUDA, @Koji GOTOH

    The 36th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures  2023年10月 

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    開催年月日: 2023年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:大韓民国  

    リポジトリ公開URL: https://hdl.handle.net/2324/7157018

  • Improvement of Fatigue Strength of Welded Joints by Grain Refinement Using Laser Irradiation and Locally Carburized 国際会議

    Kazutaka TERATSUJI, Tomoya UCHIMURA, Kazuki MATSUDA, Koji GOTOH

    The 36th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures  2023年10月 

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    開催年月日: 2023年10月

    記述言語:英語  

    開催地:Busan   国名:大韓民国  

    The purpose of this paper is to confirm fatigue strength of welded joints can be improved by grain refinement using laser irradiation and localized carburization considering corrosion and abrasion. Comparing measured temperature history of laser irradiation with theoretical solutions of moving heat source and instantaneous line heat source, and effective temperature range of grain refinement are investigated. Only moving heat source agreed with the measured values. Maximum temperature and time required from 800 ℃ to 500 ℃ (Δt8/5) of the grain refinement region are obtained by applying moving heat source. It is reasonable based on the theory of phase transformation. Four-point bending fatigue tests were conducted on T-joint specimens as welded, laser irradiated, and locally carburized. As a result, number of cycles to failure of the specimens which locally carburized and laser irradiated were equivalent and they are longer than that of the specimens as-welded. The main reason is locally carburized and laser irradiated had more gentler toe shapes than as-welded. However, the porosity was observed in the carburized specimen. It can affect fatigue strength, further improvement of fatigue strength was expected by eliminating it.

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  • Study on Fabrication of Butt Welded Joints of Thick Plates by Laser-Arc Hybrid Welding in Horizontal Position 国際会議

    Toshiki TSURUOKA, Tomoya NAKADA, Tomoya UCHIMURA, Kazuki MATSUDA, Koji GOTOH

    The 36th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures  2023年10月 

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    開催年月日: 2023年10月

    記述言語:英語  

    開催地:Busan   国名:大韓民国  

    Laser-arc hybrid welding (LAHW) is an advanced welding process that combines arc and laser welding as one molten pool. Compared with conventional arc welding, LAHW can be performed higher welding speeds with narrower grooves, and weld deformation can be significantly reduced. When LAHW is applied to construction of structural members, the welding is generally performed in a flat position because it is automatic welding system is applied from the viewpoint of safety in the work environment. Flat position (PA), it is expected to be applied to many welds of large steel structures by applying LAHW to horizontal position. However, the application of LAHW in the construction of large structures is expected by expanding the applicable welding position. In this study, butt joints with a plate thickness of 20 mm were fabricated in the horizontal position (PC) as a target of welding position in LAHW. By trial and error, referring to the welding conditions in the flat position, the welding conditions that produced a sound weld bead appearance were derived. However, molten metal was sagging at some of lower weld bead edge of the front bead. A sliding jig was designed to prevent the front bead sagging. As a result, the sagging was prevented and it was expected that the jig was effective in relaxing the shape of the weld toe for improving the fatigue strength of the joint. In the construction stages of large structures, it is difficult to maintain a constant root gap over the entire length of the weld line, so it is desirable to extend the allowable range of the initial gap. Therefore, we attempted to process with an initial root gap of 1.5 mm. However, we were unable to find welding conditions that would avoid undercutting and melting-in, and confirmed that the applicable limit of the initial root gap is 1.0 mm for the construction method studied in this study.

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  • 繰返し負荷を受ける鋼材の応力~ひずみ関係に関する実験的検討

    #下岡司,@村上幸治,@松田和貴,@後藤浩二

    溶接学会九州支部研究発表会  2022年9月 

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    開催年月日: 2022年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:福岡県   国名:日本国  

    リポジトリ公開URL: http://hdl.handle.net/2324/4798534

  • 機械学習を援用した溶接施工条件および溶接音を入力変数としたすみ肉溶接ビード形状の予測に関する研究

    #馮永益,@渡辺範弘,@山嵜賢人,@松田和貴,@後藤浩二

    溶接学会九州支部研究発表会  2022年9月 

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    開催年月日: 2022年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:福岡県   国名:日本国  

    リポジトリ公開URL: http://hdl.handle.net/2324/4822551

  • 疲労強度改善のためのレーザ照射による結晶粒微細化に関する基礎検討

    寺辻和陸, 内村友哉, 松田和貴, 後藤浩二

    溶接学会九州支部研究発表会  2022年9月 

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    開催年月日: 2022年9月

    記述言語:日本語  

    開催地:福岡県   国名:日本国  

    researchmap

  • Fatigue strength improvement method for thin sheet GMA welding joints by weaving 国際会議

    @Kazuki Matsuda, @Yoshinari Ishida, @Shinji Kodama

    International Institute of Welding  2022年7月 

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    開催年月日: 2022年7月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

    Kazuki Matsuda, Yoshinari Ishida, Shinji Kodama, Fatigue strength improvement method for thin sheet GMA welding joints by weaving, International Institute of Welding, XII-2494-2022, Tokyo, July 20-21, 2022

  • 薄板アーク溶接部の残留応力に及ぼす鋼板,ワイヤ強度の影響

    @松田 和貴, @児玉 真二

    溶接学会全国大会  2021年9月 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:WEB開催   国名:日本国  

    その他リンク: https://doi.org/10.14920/jwstaikai.2021f.0_230

  • 1.5GPa級鋼板を含む異強度板組におけるスポット溶接部継手強度評価

    @篠原萌, @松田和貴, @古迫誠司,@児玉真二

    溶接学会全国大会  2021年9月 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:WEB開催   国名:日本国  

    その他リンク: https://doi.org/10.14920/jwstaikai.2021f.0_188

  • 薄板アーク溶接部の微小疲労亀裂の観察(第二報)

    @松田 和貴, @児玉 真二

    溶接学会全国大会  2020年9月 

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    開催年月日: 2020年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:WEB開催   国名:日本国  

    その他リンク: https://doi.org/10.14920/jwstaikai.2020f.0_164

  • 薄板重ね隅肉継手のルート部の応力解析

    @松田 和貴, @児玉 真二

    溶接学会全国大会  2019年9月 

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    開催年月日: 2019年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    その他リンク: https://doi.org/10.14920/jwstaikai.2019f.0_226

  • Evaluation of corona bond area strength of resistance spot welding 国際会議

    @Kazuki MATSUDA, @Shinji KODAMA

    International Symposium on Joining Technologies in Advanced Automobile Assembly 2018  2018年11月 

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    開催年月日: 2018年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • 抵抗スポット溶接コロナボンド部の強度評価

    @松田 和貴, @児玉 真二

    溶接学会全国大会  2018年9月 

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    開催年月日: 2018年9月

    記述言語:日本語  

    開催地:愛媛県   国名:日本国  

    その他リンク: https://doi.org/10.14920/jwstaikai.2018f.0_240

  • 薄板アーク溶接部に生じた微小亀裂の観察

    @松田 和貴, @石田 欽也, @児玉 真二

    溶接学会全国大会  2017年9月 

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    開催年月日: 2017年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:福岡県   国名:日本国  

    その他リンク: https://doi.org/10.14920/jwstaikai.2017f.0_18

  • ビーチマーク試験による薄鋼板の溶接部疲労亀裂の伝播特性評価

    @松田 和貴, @石田 欽也, @児玉 真二, @宮崎 康信

    溶接学会全国大会  2016年9月 

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    開催年月日: 2016年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:群馬県   国名:日本国  

    その他リンク: https://doi.org/10.14920/jwstaikai.2016f.0_368

  • 高強度ワイヤ適用による薄板ハイテン重ね隅肉溶接継手の疲労強度向上

    @児玉真二,@松田和貴,@石田欽也,@宮崎康信

    溶接学会全国大会  2016年9月 

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    開催年月日: 2016年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:群馬県   国名:日本国  

    その他リンク: https://doi.org/10.14920/jwstaikai.2016f.0_378

  • 複数周波数成分を有する重畳応力履歴の単一周波数応力履歴への置き換えに関する一考察

    @松田 和貴, @後藤 浩二

    日本船舶海洋工学会講演会  2015年5月 

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    開催年月日: 2015年5月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    その他リンク: https://doi.org/10.14856/conf.20.0_489

  • 等価疲労応力を用いた複数周波数成分を有する変動加重条件下における疲労亀裂伝播挙動解析

    @松田和貴,@後藤浩二

    溶接構造シンポジウム  2014年12月 

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    開催年月日: 2014年12月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪   国名:日本国  

  • Numerical simulation of fatigue crack propagation under superimposed loading histories, -mean stress effect for fatigue crack propagation- 国際会議

    The 28th Asian Pacific Technical Exchange Advisory Meeting on Marine Structures  2014年10月 

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    開催年月日: 2014年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:トルコ共和国  

  • 重畳応力条件下における疲労き裂伝播挙動解析 -(第二報)平均応力振幅及び平均応力変動の伝播挙動に及ぼす影響に関する検証-

    @松田和貴,@村上幸治,@後藤浩二

    日本船舶海洋工学会講演会  2014年5月 

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    開催年月日: 2014年5月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:宮城   国名:日本国  

  • Numerical Simulation of Fatigue Crack Propagation Under Simulated Whipping Loading Arising in Hull Structures 国際会議

    @Kazuki Matsuda, @Koji Gotoh

    ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering  2013年7月 

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    開催年月日: 2013年7月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:フランス共和国  

  • 重畳応力条件下における疲労き裂伝播挙動解析 -平均応力の伝播挙動に及ぼす影響に関する検証-

    @松田和貴,@村上幸治,@杉野弘樹,@後藤浩二

    日本船舶海洋工学会講演会  2013年5月 

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    開催年月日: 2013年5月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:広島   国名:日本国  

  • せん断型から開口型に至る疲労き裂発生評価モデルの実験的検証

    @松田和貴,@辻隆太郎,@村上幸治,@後藤浩二

    日本船舶海洋工学会講演会  2012年11月 

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    開催年月日: 2012年11月

    記述言語:日本語  

    開催地:千葉   国名:日本国  

  • Numerical simulation of fatigue crack propagation under superposed loading histories with two different frequencies 国際会議

    @Koji Gotoh, @Kazuki Matsuda, @O Kitamura

    HYDROELASTICITY 2012  2012年9月 

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    開催年月日: 2012年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • RPG荷重基準に基づくき裂発生評価モデルの実験的検証

    @松田和貴,@辻隆太郎,@村上幸治,@後藤浩二

    溶接学会九州支部研究発表会  2012年7月 

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    開催年月日: 2012年7月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:鹿児島   国名:日本国  

  • 複数周波数成分を有する重畳応力条件下における疲労き裂伝播挙動解析手法

    @後藤浩二,@松田和貴

    日本船舶海洋工学会講演会  2012年5月 

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    開催年月日: 2012年5月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:兵庫県   国名:日本国  

  • Numerical simulation of fatigue crack propagation under variable amplitude loading with different frequency components 国際会議

    @Kazuki Matsuda, @Hirokazu Takahashi, @Koji Gotoh

    The 25th Asian Pacific Technical Exchange Advisory Meeting on Marine Structures  2011年9月 

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    開催年月日: 2011年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:大韓民国  

  • RPG荷重基準に基づくき裂発生評価モデルの実験的検証

    @松田和貴,@村上幸治,@後藤浩二

    溶接学会九州支部研究発表会  2011年7月 

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    開催年月日: 2011年7月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:熊本   国名:日本国  

▼全件表示

MISC

  • シャシー部品用高強度鋼板のアーク溶接技術

    @児玉真二,@富士本博紀,@石田欽也,@松田和貴,@松葉正寛

    日本製鉄技報   2019年4月

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    記述言語:日本語   掲載種別:機関テクニカルレポート,技術報告書,プレプリント等  

    Recent research progresses on fatigue strength and corrosion resistance of arc welded joint using high tensile strength steel sheets are described, focusing on automotive chassis members. At first, the impacts of weld metal hardness and weld bead shape on fatigue strength are studied, and the importance of the selection of welding wires and the optimization of welding conditions are indicated. Additionally, the effects of the shielding gas components on weld bead shapes or the arrangements of the stiffening beads to reduce stress concentrations are described. Secondly, the properties of electrodeposition coating on the weld part are evaluated in order to improve corrosion resistance. It is confirmed that the coating properties depend on the characteristics of peeling or coating on the weld slags, and the coating defects are varied according to the type of welding wire and steel plate. Finally, the shot blast treatment is proposed as a countermeasure for supporting corrosion resistance and fatigue strength.

    その他リンク: https://www.nipponsteel.com/en/tech/report/pdf/122-12.pdf

  • 自動車足回り用超高強度鋼板の溶接部の疲労強度向上

    @児玉真二,@石田欽也,@松田和貴,@小川正裕

    新日鉄住金技報   2017年12月

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    記述言語:日本語   掲載種別:機関テクニカルレポート,技術報告書,プレプリント等  

    Recent research progresses on fatigue strength of arc welded joint using high tensile strength steel sheets are described, focusing on automotive chassis members. At first, effects of the high strength welding wire on fatigue strength were examined by bending fatigue test. As the result, it was confirmed that increasing of welded metal strength associated by the high strength wire suppresses the crack in welded metal around the toe portion, and improves the fatigue strength of welded joint. Secondly, comparison of fatigue strength between fillet lap joints and butt joints were studied by tensile load fatigue test. The fatigue strength of butt joint increases twice as high compared with its of fillet lap joint, while fillet lap joint and half penetration butt joint on which the root portion cracks generated could not obtain the effects of high strength welding wire. Finally, welded joints with the stiffening bead were proposed as a countermeasure for improving fatigue strength including root portion, and its potential for the stress reduction and the increasing of fatigue strength was indicated.

    その他リンク: https://www.nipponsteel.com/en/tech/report/nssmc/pdf/119-10.pdf

産業財産権

特許権   出願件数: 28件   登録件数: 11件
実用新案権   出願件数: 0件   登録件数: 0件
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所属学協会

  • 一般社団法人溶接学会

  • 日本船舶海洋工学会

委員歴

  • 一般社団法人溶接学会   FS委員会 委員   国内

    2022年10月 - 現在   

  • 一般社団法人溶接協会   学識会員   国内

    2022年10月 - 2024年9月   

学術貢献活動

  • 司会

    役割:パネル司会・セッションチェア等

    溶接学会九州支部研究発表会  ( 福岡 ) 2024年11月

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    種別:大会・シンポジウム等 

  • Session Chair 国際学術貢献

    役割:パネル司会・セッションチェア等

    The 37th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures  ( Kure, Hiroshima, Japan ) 2024年9月

     詳細を見る

    種別:大会・シンポジウム等 

  • 学術論文等の審査

    役割:査読

    2024年

     詳細を見る

    種別:査読等 

    外国語雑誌 査読論文数:8

    日本語雑誌 査読論文数:2

  • 学術論文等の審査

    役割:査読

    2023年

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    種別:査読等 

    外国語雑誌 査読論文数:5

  • 司会

    溶接学会九州支部研究発表会  ( 福岡 ) 2022年9月

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    種別:大会・シンポジウム等 

  • 学術論文等の審査

    役割:査読

    2022年

     詳細を見る

    種別:査読等 

    外国語雑誌 査読論文数:4

    国際会議録 査読論文数:1

▼全件表示

共同研究・競争的資金等の研究課題

  • 大型部材製造のための直流パルス溶接プロセスを用いたWAAMによる高速造形技術の研究

    2024年

    2024年度 次世代を担う研究者助成事業

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    担当区分:研究代表者  資金種別:受託研究

  • 溶接条件をパラメータとした深層学習による自動溶接・積層造形検査技術の構築

    2024年

    九州大学大学院 システム情報科学研究院 情報知能工学部門 数理・データサイエンス教育研究センター  数理・データサイエンスに関する教育・研究支援プログラム 

    松田 和貴

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    担当区分:研究代表者 

  • 新接合技術を用いた既存の大型溶接構造物の強度信頼性に関する検討

    2023年

    公益財団法人鹿島学術振興財団海外派遣援助(長期)

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    担当区分:研究代表者  資金種別:受託研究

  • 不規則な荷重履歴作用下における大型溶接構造物の疲労き裂発生・伝播挙動解析

    2014年

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

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    担当区分:研究代表者  資金種別:科研費

担当授業科目

  • 船舶海洋システム工学実験

    2023年4月 - 2023年9月   前期

  • 船舶海洋工学実験

    2024年4月 - 2024年9月   前期

FD参加状況

  • 2024年9月   役割:参加   名称:令和6年度九州大学安全の日講演会 教育研究における安全対策 FY2024 Kyushu University Safety Day Lecture Safety Measures in Education and Research

    主催組織:全学

  • 2023年4月   役割:参加   名称:令和5年度 第1回全学FD(新任教員の研修)The 1st All-University FD (training for new faculty members) in FY2023

    主催組織:全学

その他教育活動及び特記事項

  • 2023年  クラス担任  全学

社会貢献活動

  • 高大連携事業:金属解析セミナー(強度等検証による材料推定及び大型溶接構造物の構造様式)

    福岡県立新宮高等学校 理数科1年  2024年8月

  • 高大連携事業:金属解析セミナー(強度等検証による材料推定及び大型溶接構造物の構造様式)

    福岡県立新宮高等学校 理数科1年  2022年8月

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    対象: 幼稚園以下, 小学生, 中学生, 高校生

    種別:セミナー・ワークショップ

海外渡航歴

  • 2023年6月 - 2024年5月

    滞在国名1:カナダ   滞在機関名1:Department of Mechanical and Mechatronics Engineering, University of Waterloo