|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Effects of Induced Surface Defects on Crack Initiation and Fatigue Strength for HCF and VHCF of a Structural Steel
||Youshi Hong, Qingqing Jiang, Chengqi Sun
|On-Site Speaker (Planned)
Surface defects of structural steels have remarkable influence on crack initiation and fatigue strength for high-cycle-fatigue (HCF) and very-high-cycle fatigue (VHCF). In this paper, we performed fatigue tests with rotary bending method on specimens with different types of induced surface defects for a structural steel, such that to investigate the effects of surface defects on crack initiation and fatigue strength of HCF and VHCF. The S-N data show the degradation of fatigue strength due to the existence of surface defects, which is described by available models. The observations via SEM and TEM on the region of crack initiation demonstrate the detailed microstructure morphologies and selected area X-ray diffraction patterns, which reveal the micro-mechanism of crack initiation in HCF and VHCF regimes with the effects of induced surface defects. The results are compared with the case without surface defects.
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