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Featured researches published by Zhengqiang Lei.


Theoretical and Applied Mechanics Letters | 2012

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

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

Propensities of crack interior initiation and early growth for very-high-cycle fatigue of high strength steels

Youshi Hong; Zhengqiang Lei; Chengqi Sun; Aiguo Zhao


International Journal of Fatigue | 2012

Effects of strength level and loading frequency on very-high-cycle fatigue behavior for a bearing steel

Aiguo Zhao; Jijia Xie; Chengqi Sun; Zhengqiang Lei; Youshi Hong


International Journal of Fatigue | 2016

The formation mechanism of characteristic region at crack initiation for very-high-cycle fatigue of high-strength steels

Youshi Hong; Xiaolong Liu; Zhengqiang Lei; Chengqi Sun


Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2011

Prediction of threshold value for FGA formation

Aiguo Zhao; Jijia Xie; Chengqi Sun; Zhengqiang Lei; Youshi Hong


Fatigue & Fracture of Engineering Materials & Structures | 2012

A cumulative damage model for fatigue life estimation of high-strength steels in high-cycle and very-high-cycle fatigue regimes

Chengqi Sun; Jijia Xie; Aiguo Zhao; Zhengqiang Lei; Youshi Hong


International Journal of Fatigue | 2013

Effects of inclusion size and stress ratio on fatigue strength for high-strength steels with fish-eye mode failure

Chengqi Sun; Zhengqiang Lei; Jijia Xie; Youshi Hong


Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2012

Effects of inclusion size and location on very-high-cycle fatigue behavior for high strength steels

Zhengqiang Lei; Youshi Hong; Jijia Xie; Chengqi Sun; Aiguo Zhao


Mechanics of Materials | 2014

Effects of stress ratio on crack growth rate and fatigue strength for high cycle and very-high-cycle fatigue of metallic materials

Chengqi Sun; Zhengqiang Lei; Youshi Hong


Science China-physics Mechanics & Astronomy | 2014

Effects of loading condition on very-high-cycle fatigue behaviour and dominant variable analysis

Zhengqiang Lei; Jijia Xie; Chengqi Sun; Youshi Hong

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Youshi Hong

Chinese Academy of Sciences

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Chengqi Sun

Chinese Academy of Sciences

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Jijia Xie

Chinese Academy of Sciences

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Aiguo Zhao

Chinese Academy of Sciences

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Xiaolong Liu

Chinese Academy of Sciences

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