文献类型：期刊文献

英文题名：Effect of load ratio on fatigue crack growth in the near-threshold regime: A literature review, and a combined crack closure and driving force approach

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, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2015

卷号：141

起止页码：57

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20152100872215);WOS:【SCI-EXPANDED(收录号:WOS:000356239300004)】；

基金：The authors are grateful for the supports provided by National Natural Science Foundation of China (51325504 and 51205131) and Natural Science Foundation of Shanghai (12ZR1442900). Ming-Liang Zhu also appreciates the support from Chen Guang Project (12CG33) by Shanghai Municipal Education Commission and Shanghai Education Development Foundation.

语种：英文

外文关键词：Near-threshold fatigue crack growth; Load ratio; Crack closure; Driving force parameter; Load-shedding technique

摘要：The current state of influence of load ratio, R, on fatigue crack growth (FCG) behavior is thoroughly reviewed. Two main approaches, including crack closure concept and driving force parameter method, when used independently, are found to be short of accuracy during load-shedding procedure in the near-threshold regime. By combining an equivalent driving force model and crack closure approach, a new crack opening equation and a general FCG law is established for the load-shedding technique. This merging method does not involve crack closure measurement, and is capable to predict R dependence of FCG curves and fatigue thresholds fairly well. (C) 2015 Elsevier Ltd. All rights reserved.