文献类型：期刊文献

英文题名：Unified constraint parameter based on crack-tip opening displacement

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

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

年份：2018

卷号：200

起止页码：175

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20183105631212);WOS:【SCI-EXPANDED(收录号:WOS:000444000400015)】；

基金：This work is supported by the Projects of the National Natural Science Foundation of China (Grant No: 51575184) and by the Fundamental Research Funds for the Central Universities (No: 222201718005).

语种：英文

外文关键词：CTOD; In-plane constraint; Out-of-plane constraint; Fracture toughness; Equivalent plastic strain

摘要：To develop new fracture assessment methodology to incorporate both in-plane and out-of-plane constraints, it is desirable to develop unified constraint parameters convenient for engineering calculation and application. In this work, a new unified constraint parameter A(d) based on crack-tip opening displacement (CTOD) was proposed, and the capability of A(d) to characterize both in-plane and out-of-plane constraints has been investigated by a comparison with the unified constraint parameter A(p). The results indicate that the parameter A(d) can quantify both in-plane and out-of-plane constraints and their change with load levels. A unified correlation line between the normalized fracture toughness J(C)/J(ref) and A(d) (toughness locus) can be established for both ductile and brittle fracture. The parameter A(d) based on CTOD has clear physical and geometric meaning, and it can be easily measured and determined in FEM analyses. Therefore, the A(d) may be an appropriate engineering unified constraint parameter, and it may be adopted in fracture assessments of cracked structures for incorporating both in-plane and out-of-plane constraints.