文献类型：期刊文献

英文题名：In situ SEM study on fatigue short crack initiation and propagation in microscale single-crystal copper with different loading conditions

作者：Wang, Yiheng[1,2];Wan, Shijia[1,2];Sumigawa, Takashi[3];Kitamura, Takayuki[3];Yan, Yabin[1,2];Xuan, Fuzhen[1,2]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Intelligent Sensing & Detect Tech, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[3]Kyoto Univ, Grad Sch Energy Sci, Sakyo Ku, Kyoto 6068501, Japan

年份：2026

卷号：209

外文期刊名：INTERNATIONAL JOURNAL OF FATIGUE

收录：;EI(收录号：20261120243661);WOS:【SCI-EXPANDED(收录号:WOS:001713343800001)】；

基金：Y. Yan thanks the support of National Natural Science Foundation of China (Grant Nos. 52275149 and U2468210) . F.Z. Xuan thanks the support of Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 52321002) and Na-tional Natural Science Foundation of China (Grant No. 51835003) . T. Sumigawa thanks the support of JST CREST (Grant No. JPMJCR2092) and JSPS KAKENHI (Grant Nos. JP24H00283, JP24K21575, and JP22K18754) .

语种：英文

外文关键词：Insitu SEM; Single-crystal copper; Fatigue short crack; Crack growth rate; Fatigue life

摘要：Due to experimental limitations, research on fatigue short cracks has mainly been confined to macroscale metal materials, with experimental studies on nanoscale short cracks being extremely scarce. In this study, a series of cyclic tension-compression fatigue experiments were conducted under in situ SEM to investigate the initiation and propagation behaviors of micro-nanoscale fatigue short cracks in single-crystal copper. Fatigue crack initiation and propagation behaviors were compared under various strain amplitudes and loading frequencies. Fluctuations in the growth rate of fatigue short cracks were observed, and the cyclic hardening and softening exhibited by the resolved shear stress provided corresponding fundamental explanation. The growth rate usually reached its maximum value around crack initiation, while the subsequent propagation process exhibited a lag in internal cracks relative to surface cracks, and was influenced by both strain amplitude and loading frequency. The fatigue lives were further divided into initiation lives and propagation lives, both showing a good Manson-Coffin relationship but different sensitivities to loading frequency, which provided valuable insights for fatigue short crack of microscale metallic material.