文献类型：期刊文献

英文题名：Prediction of creep crack growth behavior in Cr-Mo-V steel specimens with different constraints for a wide range of C

作者：Zhang, J. W.[1];Wang, G. Z.[1];Xuan, F. Z.[1];Tu, S. T.[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Pressurized Syst & Safety, Shanghai 200237, Peoples R China

年份：2014

卷号：132

起止页码：70

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20144600206756);WOS:【SCI-EXPANDED(收录号:WOS:000346396500005)】；

基金：This work was financially supported by the Projects of the National Natural Science Foundation of China (51375165, 51325504).

语种：英文

外文关键词：Creep crack growth; Constraint effects; Creep ductility; Stress; Specimen

摘要：The stress dependent creep ductility and strain rate model were implemented in a ductility exhaustion based damage model, and the creep crack growth rates in Cr-Mo-V steel specimens with different constraints over a wide range of C*-integral have been predicted by finite element analyses. The predicted creep crack growth rates agree well with the existing experimental data. The creep crack growth rate increases with increasing specimen constraint, and the specimen constraint has effect on the C*-integral values of the slope turning points on the crack growth rate curves. The mechanical mechanism of specimen constraint effects on creep crack growth behavior was analyzed and discussed. The results show that the constraint effects on the creep crack growth behavior for a wide range of C*-integral mainly arise from interaction of crack-tip stress states and stress dependent creep ductility of the steel. The constraint dependent creep crack growth rate data in a wide range of C*-integral should be obtained and used in creep life assessments of components. (C) 2014 Elsevier Ltd. All rights reserved.