Kyushu University Academic Staff Educational and Research Activities Database
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Shigeki YASHIRO Last modified date:2021.05.21

Professor / Aerospace Structures and Structural Dynamics Laboratory
Department of Aeronautics and Astronautics
Faculty of Engineering

Graduate School
Undergraduate School

 Reseacher Profiling Tool Kyushu University Pure
Academic Degree
Doctor of Engineering
Country of degree conferring institution (Overseas)
Field of Specialization
Mechanics of composite materials and structures
ORCID(Open Researcher and Contributor ID)
Total Priod of education and research career in the foreign country
Outline Activities
Research activities
1. Prediction of mechanical properties of composite materials.
2. Static and dynamic failure mechanisms of composite materials.
3. Improvement of nondestructive evaluation techniques of composite materials.
4. Prediction of the manufacturing process of composite materials.
5. Development of new test methods and measurement techniques of composite materials.

Academic activities
Undergraduate education: Fundamental Physics IA in KIKAN Education, Exercise course for Fundamental Physics IA, Theory of Elasticity, Structural mechanics, Mechanical Vibrations, Experiments for Aerospace Engineering
Graduate education: Computational Structural Mechanics
Research Interests
  • Development of new composite structures by the automated fiber placement (AFP)
    keyword : Automated fiber placement (AFP), Internal defects, Stacking sequence optimization
  • A new approach of damage identification based on the topology optimization using visualized ultrasonic wave propagation
    keyword : Visualized ultrasonic wave propagation, Topology optimization, Delamination, Composite materials
  • Improvement of mechanical properties of composite laminates using spinnable carbon nanotubes
    keyword : Carbon nanotube spun yarn, Carbon nanotube spun sheet
  • A new test method for evaluating interlaminar fracture toughness of composite laminates
    keyword : Composite materials, Delamination, Interlaminar fracture toughness, Testing method
  • Strength evaluation considering complex microstructure of composites
    keyword : Discontinuous fiber-reinforced composites, Microstructure, Numerical analysis
  • Prediction of manufacturing process of composite structural components
    keyword : Composite materials, Injection molding, Resin transfer molding (RTM), Microstructure, Numerical analysis
  • Modeling of out-of-plane impact events on composites
    keyword : Composite materials, Impact, damage, Numerical analysis
  • Prediction of static and fatigue damage progress in composites
    keyword : Composite materials, Damage, Delamination, Finite-element analysis
  • Damage monitoring of composites using optical fiber sensors
    keyword : Composite materials, Delamination, Structural health monitoring, Inverse analysis
  • Visualizing technology for the ultrasound propagation
    keyword : Nondestructive testing, Ultrasonic testing
Academic Activities
1. Shigeki YASHIRO, Keiji Ogi, High-velocity impact damage in CFRP laminates. In: Vadim V. Silberschmidt, editor. Dynamic Deformation, Damage and Fracture in Composite Materials and Structures, Woodhead Publishing, Chapter 7 (pp. 169-191), 2016.02.
1. 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.
2. 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.
3. 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..
4. 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..
5. 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..
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.
11. 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.
12. 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.
13. 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.
14. 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.
15. 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.
16. 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.
17. 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.
18. 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.
19. 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.
20. 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.
21. 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.
22. 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.
23. 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.
24. 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.
25. 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.
26. 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.
27. 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.
28. 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.
Membership in Academic Society
  • The Japan Society for Aeronautical and Space Sciences
  • The Society of Materials Science, Japan
  • Japan Society for Composite Materials
  • The Japan Society of Mechanical Engineers
  • JSMS Award for Promising Researchers, The Society of Materials Science, Japan. 2015.05.
  • JCOM Award for Promising Researchers, JSMS Committee on Composite Materials. 2015.05.
  • JCOM Award for Scientific Papers, JSMS Committee on Composite Materials. 2014.06.
  • Hayashi Award, The Japan Society for Composite Materials. 2011.05.
  • JSME Young Engineers Award, The Japan Society of Mechanical Engineers. 2009.04.
  • JCOM Award for Scientific Papers, JSMS Committee on Composite Materials. 2009.03.
  • Advanced Technology Award, The Visualization Society of Japan. 2007.07.
  • Best Paper Award, The Japan Society for Composite Materials. 2007.05.
Educational Activities
Undergraduate education
Mechanical Vibrations A
Mechanical Vibrations B
Theory of Elasticity I
Theory of Elasticity II
Fundamental Structural Mechanics A
Fundamental Structural Mechanics B
Applied Structural Mechanics A
Applied Structural Mechanics B
Vibrations in Aerospace Applications A
Vibrations in Aerospace Applications B
Aircraft and Spacecraft Materials B
Aerospace Laboratory

Graduate education
Computational Structural Mechanics
Aerospace Structural Systems Engineering Seminar I
Aerospace Structural Systems Engineering Seminar II
Aerospace Structural Systems Engineering Laboratory
Advanced Aerospace Structural Systems Engineering