文献类型：期刊文献

英文题名：Local strain accumulation in fatigue crack propagation process of Ti-6Al-4V alloy

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

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Minist Educ, Key Lab Pressure Syst & Safety, 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：5

起止页码：836

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

收录：;EI(收录号：20165103150574);WOS:【SCI-EXPANDED(收录号:WOS:000398597700013)】；

基金：The authors would like to acknowledge gratefully for the financial support through National Natural Science Foundations of China (51371082, 51322510) and the 111 project. The author X. C. Zhang is also grateful for the support by Shanghai Pujiang Program, Shanghai Technology Innovation Program of SHEITC (CXY-2015-001), and Fok Ying Tung Education Foundation.

语种：英文

外文关键词：crack growth rate; digital image correlation; multi-scale fatigue crack; titanium alloy

摘要：Fatigue crack growth behaviours of the titanium alloy Ti-6Al-4V, with two different microstructures, at different maximum stresses were identified by digital image correlation technique. Full-field strains were monitored around fatigue cracks after consecutive cycles in fatigue crack growth experiments. Results indicated that the Ti-6Al-4V alloy with a bi-modal microstructure had a better fatigue resistance than that with a primary- microstructure. Typical behaviours of small cracks and the evolution of multi-scale fatigue cracks were clarified. The strain accumulations around the micro-notch and fatigue crack increased with increasing number of load cycles. On the basis of von Mises strain mapping, it was found that crack growth rate could be characterized by crack-tip plastic zone size.