Zhengqiang Lei
Chinese Academy of Sciences
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Publication
Featured researches published by Zhengqiang Lei.
Theoretical and Applied Mechanics Letters | 2012
Zhengqiang Lei; Aiguo Zhao; Jijia Xie; Chengqi Sun; Youshi Hong
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.
International Journal of Fatigue | 2014
Youshi Hong; Zhengqiang Lei; Chengqi Sun; Aiguo Zhao
International Journal of Fatigue | 2012
Aiguo Zhao; Jijia Xie; Chengqi Sun; Zhengqiang Lei; Youshi Hong
International Journal of Fatigue | 2016
Youshi Hong; Xiaolong Liu; Zhengqiang Lei; Chengqi Sun
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2011
Aiguo Zhao; Jijia Xie; Chengqi Sun; Zhengqiang Lei; Youshi Hong
Fatigue & Fracture of Engineering Materials & Structures | 2012
Chengqi Sun; Jijia Xie; Aiguo Zhao; Zhengqiang Lei; Youshi Hong
International Journal of Fatigue | 2013
Chengqi Sun; Zhengqiang Lei; Jijia Xie; Youshi Hong
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2012
Zhengqiang Lei; Youshi Hong; Jijia Xie; Chengqi Sun; Aiguo Zhao
Mechanics of Materials | 2014
Chengqi Sun; Zhengqiang Lei; Youshi Hong
Science China-physics Mechanics & Astronomy | 2014
Zhengqiang Lei; Jijia Xie; Chengqi Sun; Youshi Hong