文献类型：期刊文献

英文题名：Multi-scale fatigue crack propagation in 304 stainless steel: experiments and modelling

作者：Ye, S.[1];Zhang, X. -C.[1];Gong, J. -G.[1];Tu, S. -T.[1];Zhang, C. -C.[2]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]AECC Commercial Aircraft Engine Co Ltd, Shanghai Engn Res Ctr Commercial Aircraft Engine, Shanghai 201108, Peoples R China

年份：2017

卷号：40

期号：11

起止页码：1928

外文期刊名：FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES

收录：;EI(收录号：20171403532242);WOS:【SCI-EXPANDED(收录号:WOS:000412226900021)】；

基金：The authors would like to acknowledge gratefully for the financial support through the National Natural Science Foundations of China (51322510, 51371082) and 111 project. The author X. C. Z. is also grateful for the support by the Shanghai Pujiang Program, Young Scholar of the Yangtze River Scholars Program and Shanghai Technology Innovation Program of SHEITC (CXY-2015-001).

语种：英文

外文关键词：crack propagation model; grain boundary; microstructural dissimilitude; small fatigue crack

摘要：The stages of fatigue crack initiation and small crack propagation usually occupy most part of fatigue life. The multi-scale fatigue crack propagation mechanism of 304 stainless steel using in situ optical microscopy was investigated in this paper. An analytical model was also proposed to predict the multi-scale crack growth rate. Results indicated that grain boundaries inhibit the small crack propagation and lead to the fluctuation of crack growth rate when the applied stress is relatively low. The prediction results using the proposed model agree well with the experimental result. The effect of grain size distribution on crack growth rate can be identified by the present model. Moreover, the prediction capacity of the proposed model is further verified by using another two materials, for example 7075-T6 and U720Li.