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Kazuyuki Yagi Last modified date:2017.06.26

Associate Professor / Machine Design and Bionic Systems
Department of Mechanical Engineering
Faculty of Engineering


Graduate School
Undergraduate School


E-Mail
Homepage
http://www.mech.kyushu-u.ac.jp/~tribology/index-en.html
Academic Degree
Doctor of Engineering
Field of Specialization
Tribology
Outline Activities
Dr Yagi has studied some topics in the field of tribology as follows.

Rheological phenomena of elastohydrodynamic films
Investigation of Scuffing Phenomenon in sliding contacts
Controll of lubrication characterstics by texturing surfaces
Dewetting Phenomenon of lubrication film with free surrface
Research
Research Interests
  • In-Situ Observation of Scuffing Phenomenon
    keyword : scuffing, wear, temperature, in-situ observation
    2008.04.
  • Control of hydrodynamic lubrication by surface texturing
    keyword : texture, hydrodynamic lubrication, cavitation, friction
    2007.04.
  • Temperature Measurement of Sliding Contact Area in Elastohydrodyamic Conditions
    keyword : elastohydrodynamic, temperature measurement, high sliding
    2002.04.
  • Anomalous Film Shapes in High Sliding Elastohydrodynamic Conditions
    keyword : elastohydrodynamic, temperature measurement, high sliding, rheology, dimple
    2002.04.
Academic Activities
Reports
1. In-situ Synchrotron XRD Observation System for Metal Friction Surface, [URL].
2. Hydrodynamic Lubrication Actions of Textured Surfaces.
3. Fundamentals of Elastohydrodynamic Lubrication.
4. EHL Regime Appearing in Thin Film Hydrodynamic Lubrication.
5. EHL with Various Lubricants ―Alcohol―.
6. Visualization Technologies for Lubricating Behaviors under Elastohydrodynamic Lubrication Conditions.
Papers
1. Yasuo Matsuzaki, Kazuyuki Yagi, Joichi Sugimura, In-Situ Fast and Long Observation System for Friction Surfaces during Scuffing of Steel, Wear, accepted, 2017.06, [URL].
2. Kazuyuki Yagi, Joichi Sugimura, Performance of Balancing Wedge Action in Textured Hydrodynamic Pad Bearings, Transactions of the ASME, Journal of Tribology, 2016.03, [URL].
3. Kazuyuki Yagi, Seiji Kajita, Takashi Izumi, Jun Koyamachi, Mamoru Tohyama, Koji Saito, Joichi Sugimura, Simultaneous Synchrotron X-ray Diffraction, Near-Infrared, and Visible In Situ Observation of Scuffing Process of Steel in Sliding Contact, Tribology Letters, 61, 2, 2016.01, [URL].
4. Kazuyuki Yagi, Joichi Sugimura, Balancing Wedge Action in Textured Converging Bearings, Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 230, 3, 2015.07, [URL].
5. Kazuyuki Yagi, Hajime Sato, Joichi Sugimura, On the Magnitude of Load-Carrying Capacity of Textured Surfaces in Hydrodynamic Lubrication, Tribology Online, 10, 3, 2015.06, [URL].
6. Seiji Kajita, Kazuyuki Yagi, Takashi Izumi, Jun Koyamachi, Mamoru Tohyama, Koji Saito, Joichi Sugimura, In Situ X-Ray Diffraction Study of Phase Transformation of Steel in Scuffing Process, Tribology Letters, 57, 1, 2015.01, [URL].
7. Haijiang Li, Kazuyuki Yagi, Joichi Sugimura, Seiji Kajita, Takatoshi Shinyoshi, Role of Wear Particles in Scuffing Initiation, Tribology Online, 8, 5, 2013.12, [URL].
8. Kazuyuki Yagi, Joichi Sugimura, Elastohydrodynamic Simulation of Rayleigh Step Bearings in Thin Film Hydrodynamic Lubrication, Tribology International, 64, August, 2013.04, [URL].
9. Kazuyuki Yagi, Joichi Sugimura, Balancing Wedge Action: A Contribution of Textured Surface to Hydrodynamic Pressure Generation, Tribology Letters, 50, 3, 2013.04, [URL].
10. Kazuyuki Yagi, Joichi Sugimura, Elastic Deformation in Thin Film Hydrodynamic Lubrication, Tribology International, 59, March, 170-180, 2012.06, [URL].
11. Kazuyuki Yagi, Joichi Sugimura and Philippe Vergne, Rheological Response of Fatty Alcohols in Sliding Elastohydrodynamic Contacts, Tribology International, 49, May, 58-66, 2011.12, [URL].
12. Kazuyuki Yagi, Yukito Ebisu, Joichi Sugimura, Seiji Kajita, Toshihide Ohmori and Atsushi Suzuki, In Situ Observation of Wear Process Before and During Scuffing in Sliding Contact, Tribology Letters, 43, 3, 361-368, 2011.09, [URL].
13. Kazuyuki Yagi, Philippe Vergne and Tsunamitsu Nakahara, In Situ Pressure Measurements in Dimpled Elastohydrodynamic Sliding Contacts by Raman Microspectroscopy, Tribology International, Vol.42, No.5, pp.724-730., 2009.05, [URL].
14. Kazuyuki Yagi, Wataru Takedomi, Hiroyoshi Tanaka and Joichi Sugimura, Improvement of Lubrication Performance by Micro Pit Surfaces, Tribology Online, Vol. 3, No. 5, pp.285-288., 2008.10, [URL].
15. Kazuyuki Yagi & Philippe Vergne, Abnormal Film Shapes in Sliding Elastohydrodynamic Contacts Lubricated by Fatty Alcohols, Proceedings of the Institution of Mechanical Engineers, Part J, 221, 3, pp287-300., 2007.04, [URL].
16. Kazuyuki Yagi, Keiji Kyogoku & Tsunamitsu Nakahara, Measurements of Temperature Distributions around Longitudinally Grooved Rough Surfaces in Sliding Elastohydrodynamic Point Contacts, STLE Tribology Transactions, 49, 4, pp482-489., 2006.10, [URL].
17. Kazuyuki Yagi, Keiji Kyogoku & Tsunamitsu Nakahara, Experimental Investigation of Effects of Slip Ratio on Elastohydrodynamic Lubrication Film Related to Temperature Distribution in Oil Films, Proceedings of the Institution of Mechanical Engineers, Part J, 220, 4, pp353-363., 2006.08, [URL].
18. Kazuyuki Yagi & Philippe Vergne, Film Thickness Changes in EHD Sliding Contacts Lubricated by a Fatty Alcohol, Tribology Online, 1, 1, pp5-8., 2006.08, [URL].
19. Kazuyuki Yagi, Keiji Kyogoku & Tsunamitsu Nakahara, Relationship between Temperature Distribution in EHL Film and Dimple Formation, Transactions of the ASME, Journal of Tribology, 127, 3, pp658-665., 2005.07, [URL].
Presentations
1. Kazuyuki Yagi, Takashi Izumi, Jun Koyamachi, Shuzo Sanda, Satoshi Yamaguchi, Koji Saito, Joichi Sugimura, In-situ Observation of Crystalline Orientation During Scuffing of Steel by Synchrotron X-ray Diffraction, 2015 STLE Tribology Frontiers Conference, 2015.10.26.
2. Takashi Izumi, Kazuyuki Yagi, Jun Koyamachi, Koji Saito, Shuzo Sanda, Satoshi Yamaguchi, Yasuhiro Yogo, Joichi Sugimura, Investigation of Effect of Compositions on Scuffing Behavior of Steels by
In-situ Synchrotron X-ray Diffraction, International Tribology Conference, Tokyo 2015, 2015.09.19.
3. Daiki Kawasaki, Kazuyuki Yagi, Hajime Sato, Joichi Sugimura, Direct Observation of Hydrodynamic Film Behavior in Passing of Textured Surfaces, International Tribology Conference, Tokyo 2015, 2015.09.17.
4. Takayuki Ohbuchi, Kazuyuki Yagi, Joichi Sugimura, Spectroscopic Analysis of Solidified Lubricants under High Pressure, International Tribology Conference, Tokyo 2015, 2015.09.17.
5. Hiroyuki Tango, Kazuyuki Yagi, Takashi Izumi, Mamoru Tohyama, Koji Saito, Joichi Sugimura, In-situ Measurements of Temperature Rise During Wear Process of Various Metals, International Tribology Conference, Tokyo 2015, 2015.09.17.
6. Kazuyuki Yagi, Relationship between Rheology and Film Shape in Elastohydrodynamic Contacts, Czech-Japan Tribology Workshop, 2014.11.25.
7. Kazuyuki Yagi, Joichi Sugimura, A Hydrodynamic Lubrication Mechanism of Textured Surfaces Based on Moment Balance, 3rd Malaysia-Japan Tribology Symposium 2014, 2014.11.13.
8. Yasuo Matsuzaki, Kazuyuki Yagi, Joichi Sugimura, In-situ observation of plastic flow behaviour during scuffing by long time and short interval observation system, 3rd Malaysia-Japan Tribology Symposium 2014, 2014.11.12.
9. Kazuyuki Yagi, Seiji Kajita, Takashi Izumi, Jun Koyamachi, Mamoru Tohyama, Koji Saito, Joichi Sugimura, In-situ observation of synchrotron X-ray diffraction and temperature during scuffing of steel, 2014 STLE Tribology Frontiers Conference, 2014.10.27.
10. Kazuyuki Yagi, Seiji Kajita, Takashi Izumi, Jun Koyamachi, Mamoru Tohyama, Koji Saito, Joichi Sugimura, In-situ XRD Analysis of Frictional Area during Scuffing of Steel by Synchrotron, Swiss-Japanese Tribology Meeting: Energy Savings through Tribology, 2014.09.08.
11. Kazuyuki Yagi, Keigo Nakagawa, Joichi Sugimura, Measurements of Surface Temperatures in Anomalous Elastohydrodynamic Film Shapes, 41st Leeds-Lyon Symposium on Tribology, 2014.09.04.
12. Kazuyuki Yagi, Joichi Sugimura, Impact of Balancing Wedge Action in Textured Hydrodynamic Bearings, World Tribology Congress 2013, 2013.09.10.
13. Haijiang Li, Kazuyuki Yagi, Joichi Sugimura, Seiji Kajita, Takatoshi Shinyoshi, Subsurface Deformation and Structural Changes during Scuffing of Steel, 40th Leeds-Lyon Symposium on Tribology, 2013.09.05, [URL].
14. Kazuyuki Yagi, Hajime Sato, Joichi Sugimura, Importance of Boundary Condition of Environment for Load-Carrying Capacity of Textured Surfaces, The 5th International Conference on Manufacturing, Machine Design and Tribology (ICMDT 2013), 2013.05.24.
15. Kazuyuki Yagi, Joichi Sugimura, Promoted Wedge Action by Textured Surface, The STLE 68th Annual Meeting and Exhibition, 2013.05.07.
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Membership in Academic Society
  • Japanese Society of Tribologist
  • The Japan Society of Mechanical Engineers
  • The Japan Society for Precision Engineering
  • Japan Society for Design Engineering
Educational
Other Educational Activities
  • 2007.09.