文献类型：期刊文献

英文题名：Observation and modeling of physically short fatigue crack closure in terms of in-situ SEM fatigue test

作者：Zhu, Ming-Liang[1];Xuan, Fu-Zhen[1];Tu, Shan-Tung[1]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China

年份：2014

卷号：618

起止页码：86

外文期刊名：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录：;EI(收录号：20144100089595);WOS:【SCI-EXPANDED(收录号:WOS:000344439500012)】；

基金：The authors are grateful for the support provided by the National Natural Science Foundation of China (51325504 and 51205131), and the Specialized Research Fund for the Doctoral Program of Higher Education (20120074120010).

语种：英文

外文关键词：Physically short crack; Crack closure; Fatigue crack growth; In-situ fatigue

摘要：Crack closure and opening behavior of physically short fatigue crack tip was investigated in microstructures with different grain sizes by using the in-situ SEM fatigue test. A gradually decreased crack closure zone near the crack tip was observed which depended on the microstructures, crack size and stress levels. A new parameter involving the load level, grain size, specimen dimensions and crack length was proposed to interpret the physically short crack closure development. The contribution of the gradient crack closure zone on the physically short fatigue crack growth behavior was evaluated by using the modified partial crack closure model. A generalized fatigue crack growth driving force was finally determined and correlated well with the physically short crack growth rate. (C) 2014 Elsevier B.V. All rights reserved.