Subjects on Fatigue Crack Generation in High Strength Alloys for Long-life Design
The very localized deformation processes have been found to be decisive for subsurface fatigue crack generation at the lower stress level such as the elastic incompatibility at boundaries where only a very small fraction of plastically deformed grains was detected. The material design and its microstructure modification to achieve higher fatigue resistance in long-life range are needed for the high strength alloys, which is one of the ways developing an ecomaterial. Novel systems have employed to clarify the substance crack generation and growth mechanisms of high strength alloys. The initial crack size highly depends on the maximum cyclic stress range, which implies a threshold of stress intensity range controlling mechanism. Heterogeneous microplasticity due to planar slip and restricted system is considered to play an important role on making the subsurface crack. Then, it should be progressed in the understanding of damage stage in high-cycle fatigue fracture process.
fatigue crack initiationl strain incompatibility strain gradient stress concentration microcrack
Osamu Umezawa Satoshi Morooka
Department of Materials Science and Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama, 240-8501, Japan Fundamental Studies on Technologies for Steel Materials with Enhanced Strength and Functions, Consortium of the JRCM, Tokyo, Japan
国际会议
11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)
青岛
英文
278-284
2010-09-25（万方平台首次上网日期，不代表论文的发表时间）