Very high cycle fatigue for GCr15 steel with smooth and hole-defect specimens

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	Very high cycle fatigue for GCr15 steel with smooth and hole-defect specimens
	Lei ZQ(雷铮强); Zhao AG(赵爱国); Xie JJ(谢季佳); Sun CQ(孙成奇); Hong YS(洪友士)
发表期刊	THEORETICAL & APPLIED MECHANICS LETTERS
	2012-05-10
卷号	2 期号:3 页码:031003
ISSN	2095-0349
摘要	Very high cycle fatigue (VHCF) properties of a low temperature tempering bearing steel GCr15 with smooth and hole-defect specimens are studied by employing a rotary bending test machine with frequency of 52.5 Hz. Both smooth and hole-defect specimens break in VHCF regime with some difference in fatigue crack initiation. For smooth specimens, a fine granular area (FGA) is observed near the grain boundary in the fracture surface of the specimens broken after 10^7 cycles. But no FGA is observed in the hole-defect specimens broken in VHCF regime, and the VHCF crack does not initiate from the small hole at the surface as it does at low or high cycle fatigue regime. Internal stress is employed to explain the VHCF behavior of these two types of specimens. At last, an advanced dislocation model based on Tanaka and Mura model is proposed to illustrate the internal stress process and to predict fatigue crack initiation life with FGA observed in the fracture region.; Very high cycle fatigue (VHCF) properties of a low temperature tempering bearing steel GCr15 with smooth and hole-defect specimens are studied by employing a rotary bending test machine with frequency of 52.5 Hz. Both smooth and hole-defect specimens break in VHCF regime with some difference in fatigue crack initiation. For smooth specimens, a fine granular area (FGA) is observed near the grain boundary in the fracture surface of the specimens broken after 10^7 cycles. But no FGA is observed in the hole-defect specimens broken in VHCF regime, and the VHCF crack does not initiate from the small hole at the surface as it does at low or high cycle fatigue regime. Internal stress is employed to explain the VHCF behavior of these two types of specimens. At last, an advanced dislocation model based on Tanaka and Mura model is proposed to illustrate the internal stress process and to predict fatigue crack initiation life with FGA observed in the fracture region.
关键词	Very High Cycle Fatigue Gcr15 Fga Hole-defect Experimental Research
学科领域	疲劳与断裂力学
URL	查看原文
语种	英语
项目资助者	This work was supported by the National Natural Science Foundation of China (11021262 and 11172304), and the National Basic Research Program of China (2012CB937500).
课题组名称	LNM金属材料微结构与力学性能
论文分区	二类
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/46400
专题	非线性力学国家重点实验室
通讯作者	Hong YS(洪友士)
推荐引用方式 GB/T 7714	Lei ZQ,Zhao AG,Xie JJ,et al. Very high cycle fatigue for GCr15 steel with smooth and hole-defect specimens[J]. THEORETICAL & APPLIED MECHANICS LETTERS,2012,2,3,:031003.
APA	雷铮强,赵爱国,谢季佳,孙成奇,&洪友士.(2012).Very high cycle fatigue for GCr15 steel with smooth and hole-defect specimens.THEORETICAL & APPLIED MECHANICS LETTERS,2(3),031003.
MLA	雷铮强,et al."Very high cycle fatigue for GCr15 steel with smooth and hole-defect specimens".THEORETICAL & APPLIED MECHANICS LETTERS 2.3(2012):031003.

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