文献类型：期刊文献

英文题名：Near-tip strain evolution and crack closure of growing fatigue crack under a single tensile overload

作者：Chen, Rong[1]; Zhu, Ming-Liang[1]; Xuan, Fu-Zhen[1]; Wu, Sheng-Chuan[2]; Fu, Ya-Nan[3]

机构：[1] Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, 610031, China; [3] Shanghai Synchrotron Radiation Facility [SSRF], Shanghai Advanced Research Institute, Chinese Academy of Sciences, China

年份：2020

卷号：134

外文期刊名：International Journal of Fatigue

收录：EI(收录号：20200308032405)

语种：英文

外文关键词：Fatigue crack propagation - Strain - Synchrotrons - Residual stresses - Crack tips - Synchrotron radiation - Image correlation

摘要：Fatigue crack growth retardation of AZ31 alloy under a single tensile overload was investigated by 3D synchrotron radiation, 2D in-situ SEM and digital image correlation techniques. Results showed a consistent evolution of crack closure level by both 3D and 2D methodologies. The straining and plastic zone ahead of crack-tip, and crack opening displacement behind, which were quantitative indicators of crack-tip shielding, residual stress formation and relaxation, were correlated well with the retardation behavior. Mechanistically, compressive residual stress played a dominant but time-limited role while crack closure was secondary, based on an intrinsic load transfer concept during crack growth. ? 2020 Elsevier Ltd