文献类型：期刊文献

英文题名：Load-independent creep constraint parameter and its application

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

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

年份：2014

卷号：116

起止页码：41

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20140717311799);WOS:【SCI-EXPANDED(收录号:WOS:000332497200004)】；

基金：This work was financially supported by the Projects of the National Natural Science Foundation of China (51375165, and 51325504), and the National High Technology Research and Development Program of China (2012AA040103).

语种：英文

外文关键词：Creep constraint; Load independence; Finite element; Creep crack growth; Application

摘要：A load-independent creep constraint parameter R* was proposed, and its load-independence was validated using finite element results in previous studies. A fixed distance r = 0.2 mm from a crack tip is chosen to define the R", and the R* at steady-state creep can be used to evaluate constraint level with little conservatism for whole creep time. The R" can be used for ranking constraint levels for different specimens or components, and for predicting constraint-dependent creep crack growth rates. The constraint-dependent creep crack growth rate equations of a Cr-Mo-V steel have been obtained, and it may be used in creep life assessments. (C) 2013 Elsevier Ltd. All rights reserved.