Kyushu University [Shigeki YASHIRO (Professor) Faculty of Engineering, Department of Aeronautics and Astronautics]

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Shigeki YASHIRO
Professor
Aerospace Structures and Structural Dynamics Laboratory
Department of Aeronautics and Astronautics
Faculty of Engineering
Last modified date：2024.04.08

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Department of Aeronautics and Astronautics
Graduate School of Engineering

Undergraduate School

School of Engineering

Department of Mechanical and Aerospace Engineering
School of Engineering

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Country of degree conferring institution (Overseas)

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Total Priod of education and research career in the foreign country

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1.	Sota Onodera, Koki Kawahara, Shigeki Yashiro, Damage progression and strength prediction of open-hole CFRP laminates containing ply gaps, Engineering Fracture Mechanics, https://doi.org/10.1016/j.engfracmech.2023.109681, 293, 109681, 2023.12.
2.	Kazuki Ryuzono, Shigeki Yashiro, Sota Onodera, Nobuyuki Toyama, Lamb wave mode conversion and multiple-reflection mechanisms for simply and reliably evaluating delamination in composite laminates, ADVANCED COMPOSITE MATERIALS, 10.1080/09243046.2022.2146564, 32, 5, 749-766, 2023.09.
3.	Shu Kumabe, Shigeki Yashiro, Sota Onodera, Evaluation of the frictional effect on the energy release rate in doubly end-notched tension test for mode II delamination, Engineering Fracture Mechanics, https://doi.org/10.1016/j.engfracmech.2023.109354, 288, 109354, 2023.08.
4.	Shigeki Yashiro, Tomohiro Yamasaki, Hiroto Nagai, Akinori Yoshimura, Effect of material nonlinearity on the toughness evaluation in quasi-static mode II interlaminar fracture toughness tests of composite laminates, ENGINEERING FRACTURE MECHANICS, 10.1016/j.engfracmech.2021.107879, 253, 107879, 2021.08.
5.	Kazuki Ryuzono, Shigeki Yashiro, Hiroto Nagai, Nobuyuki Toyama, Topology optimization-based damage identification using visualized ultrasonic wave propagation, Materials, 10.3390/ma13010033, 13, 1, 33, 2020.01.
6.	Shigeki Yashiro, Tatsuya Okuda, Keiji Ogi, Masaaki Nishikawa, Hiroto Nagai, Simple approach for modeling unidirectionally arrayed chopped strand laminates via the extended finite-element method, Composite Structures, 10.1016/j.compstruct.2019.111457, 229, 111457, 2019.12.
7.	Shigeki Yashiro, Ryuji Ono, Keiji Ogi, Effect of machining conditions on the trimming damage in composite laminates induced by out-of-plane shearing, Journal of Materials Processing Technology, 10.1016/j.jmatprotec.2019.04.025, 271, 463-475, 2019.09, Fast machining is essential for mass production of composite structures, and out-of-plane shearing, also known as die cutting, is appropriate for trimming. Nevertheless, little is known about shearing of polymer-matrix composites. This study was done to investigate the damaging impact of shearing conditions on carbon fiber reinforced plastic (CFRP) laminates. The clearance and temperature affected the damage progress, while the cutting speed in the tested range had negligible effect. In cross-ply laminates, delamination and matrix cracks first appeared in a narrow shearing zone, and with further loading longitudinal plies broke at the dies’ edges. Although delamination occurred only in a narrow shear-stress concentrated zone in the case of a small clearance, it was significant for a large clearance, owing to the local bending deformation. A temperature slightly lower than the glass transition temperature narrowed the delamination area, owing to the increase in the interlaminar fracture toughness as well as insignificant strength degradation of the matrix..
8.	Shigeki Yashiro, Daichi Nakashima, Yutaka Oya, Tomonaga Okabe, Ryosuke Matsuzaki, Particle simulation of dual-scale flow in resin transfer molding for process analysis, Composites Part A: Applied Science and Manufacturing, 10.1016/j.compositesa.2019.03.038, 121, 283-288, 2019.06, Modeling the inhomogeneous microstructures of fibrous tows is important for analyzing the process of resin transfer molding because dual-scale pores in a preform can lead to void formation. This study focused on the development of a microscopic flow analysis method to predict the impregnation of fiber bundles. The moving particle semi-implicit method was adopted to model the microstructure of a fiber bundle explicitly and inter-particle potential force was introduced into the numerical model to take account for the capillary effect. The predicted process of impregnation and void formation agreed with empirical observations. The developed approach was applied to predict the relationship between the modified capillary number and void content to identify the optimal molding conditions to reduce microvoids. The obtained relationship reproduced the trends of a reported experiment, which indicates that the proposed approach will provide information about optimal conditions for minimizing void content..
9.	Shigeki Yashiro, Keiji Ogi, Experimental study on shear-dominant fiber failure in CFRP laminates by out-of-plane shear loading, Journal of Composite Materials, 10.1177/0021998318801454, 53, 13, 1337-1346, 2019.05, Understanding the shear behavior and resulting fiber failure of fiber-reinforced plastics is required for better prediction of their behavior during the machining process, but knowledge regarding the shear strength of fiber failure is limited. In this study, out-of-plane shear tests were conducted to observe the shear behavior of carbon fiber-reinforced plastic laminates subjected to high shear stress exceeding the shear strength of matrix failure. The longitudinal fibers in carbon fiber-reinforced plastic unidirectional laminates were cut by shear loading without severe internal damage and the maximum shear stress causing progressive fiber breaks was much higher than the shear strength of matrix failure. This result suggested the possibility of out-of-plane shearing as a machining method for fiber-reinforced plastics and shear tests were subsequently performed for carbon fiber-reinforced plastic cross-ply laminates. Delamination was generated by high shear stress to cut the reinforcing fibers, but the size of the remaining damage was small even in the thermoset carbon fiber-reinforced plastic laminates in which delamination likely occurs, without any optimization of the trimming conditions..
10.	Shigeki Yashiro, Toshihide Agata, Akinori Yoshimura, A new approach for evaluating crack growth resistance curve of mode II delamination by doubly end-notched tension tests, Advanced Composite Materials, 10.1080/09243046.2017.1373384, 27, 2, 119-133, 2018.03.
11.	Shigeki Yashiro, Jumpei Wada, Yoshihisa Sakaida, A monitoring technique for disbond area in carbon fiber–reinforced polymer bonded joints using embedded fiber Bragg grating sensors: Development and experimental validation, Structural Health Monitoring-An International Journal, 16, 2, 185-201, 2017.03.
12.	Shigeki Yashiro, Application of particle simulation methods to composite materials: A review, Advanced Composite Materials, 10.1080/09243046.2016.1222508, 26, 1, 1-22, 2017.01.
13.	Shigeki Yashiro, Yoshihisa Sakaida, Yoshinobu Shimamura, Yoku Inoue, Evaluation of interfacial shear stress between multi-walled carbon nanotubes and epoxy based on strain distribution measurement using Raman spectroscopy, Composites Part A, 85, 192-198, 2016.06.
14.	Shigeki Yashiro, Tomonaga Okabe, Smoothed particle hydrodynamics in a generalized coordinate system with a finite-deformation constitutive model, International Journal for Numerical Methods in Engineering, 10.1002/nme.4906, 103, 11, 781-797, 2015.09.
15.	Shigeki Yashiro, Keiji Ogi, Akinori Yoshimura, Yoshihisa Sakaida, Characterization of high-velocity impact damage in CFRP laminates: Part II- prediction by smoothed particle hydrodynamics, Composites Part A, 10.1016/j.compositesa.2013.04.012, 56, 308-318, 2014.01.
16.	Shigeki Yashiro, Keiji Ogi, Tsukasa Nakamura, Akinori Yoshimura, Characterization of high-velocity impact damage in CFRP laminates: Part I- experiment, Composites Part A, 10.1016/j.compositesa.2012.12.015, 48, 93-100, 2013.05.
17.	Shigeki Yashiro, Hideaki Sasaki, Yoshihisa Sakaida, Particle simulation for predicting fiber motion in injection molding of short-fiber-reinforced composites, Composites Part A, 10.1016/j.compositesa.2012.05.002, 43, 10, 1754-1764, 2012.10.
18.	Shigeki Yashiro, Keiji Ogi, Masashi Oshita, High-velocity impact damage behavior of plain-woven SiC/SiC composites after thermal loading, Composites Part B, 10.1016/j.compositesb.2011.11.021, 43, 3, 1353-1362, 2012.04.
19.	Shigeki Yashiro, Tomonaga Okabe, Estimation of fatigue damage in holed composite laminates using an embedded FBG sensor, Composites Part A, 10.1016/j.compositesa.2011.08.021, 42, 12, 1962-1969, 2011.12.
20.	Shigeki Yashiro, Tomonaga Okabe, Kisa Matsushima, A numerical approach for injection molding of short-fiber-reinforced plastics using a particle method, Advanced Composite Materials, 10.1163/092430411X584423, 20, 6, 503-517, 2011.11.
21.	Shigeki Yashiro, Nobuyuki Toyama, Junji Takatsubo, Tetsuro Shiraishi, Laser-generation based imaging of ultrasonic wave propagation on welded steel plates and its application to defect detection, Materials Transactions, 51, 11, 2069-2075, 2010.11.
22.	Shigeki Yashiro, Keiji Ogi, Toshihiro Yamamoto, Takahiro Watanabe, A simple approach for determining the characteristic distance in the point stress criterion for holed CFRP unidirectional laminates, Advanced Composite Materials, 19, 3, 243-259, 2010.07.
23.	Shigeki Yashiro, Tomonaga Okabe, Numerical prediction of fatigue damage progress in holed CFRP laminates using cohesive elements, Journal of Solid Mechanics and Materials Engineering, 3, 11, 1212-1221, 2009.11.
24.	Shigeki Yashiro, Keiji Ogi, Fracture behavior in CFRP cross-ply laminates with initially cut fibers, Composites Part A, 10.1016/j.compositesa.2009.04.023, 40, 6-7, 938-947, 2009.06.
25.	Shigeki Yashiro, Junji Takatsubo, Nobuyuki Toyama, Tomonaga Okabe, Nobuo Takeda, Nondestructive evaluation of holed CFRP laminates by a new technique to visualize propagation of ultrasonic waves, Journal of Solid Mechanics and Materials Engineering, 2, 3, 333-341, 2008.03.
26.	Shigeki Yashiro, Junji Takatsubo, Hidekazu Miyauchi, Nobuyuki Toyama, A novel technique for visualizing ultrasonic waves in general solid media by pulsed-laser scan, NDT & E International, 41, 2, 137-144, 2008.03.
27.	Shigeki Yashiro, Junji Takatsubo, Nobuyuki Toyama, An NDT technique for composite structures using visualized Lamb-wave propagation, Composites Science and Technology, 67, 15-16, 3202-3208, 2007.12.
28.	Shigeki Yashiro, Kazue Murai, Tomonaga Okabe, Nobuo Takeda, Numerical study for identifying damage in open-hole composites with embedded FBG sensors and its application to experiment results, Advanced Composite Materials, 16, 2, 115-134, 2007.03.
29.	Shigeki Yashiro, Nobuo Takeda, Inverse analysis for estimating damage patterns in notched composite laminates using an embedded FBG sensor, Journal of Solid Mechanics and Materials Engineering, 1, 3, 310-321, 2007.03.
30.	Shigeki Yashiro, Tomonaga Okabe, Nobuo Takeda, Damage identification in a holed CFRP laminate using a chirped fiber Bragg grating sensor, Composites Science and Technology, 67, 2, 286-295, 2007.02.
31.	Shigeki Yashiro, Tomonaga Okabe, Nobuyuki Toyama, Nobuo Takeda, Monitoring damage in holed CFRP laminates using embedded chirped FBG sensors, International Journal of Solids and Structures, 44, 2, 603-613, 2007.01.
32.	Shigeki Yashiro, Nobuo Takeda, Tomonaga Okabe, Hideki Sekine, A new approach to predicting multiple damage states in composite laminates with embedded FBG sensors, Composites Science and Technology, 65, 3-4, 659-667, 2005.03.