文献类型：期刊文献

英文题名：Ductile fracture prediction based on J-integral and unified constraint parameters for cracked pipes

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

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

年份：2019

卷号：215

起止页码：1

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20191906903660);WOS:【SCI-EXPANDED(收录号:WOS:000470057600001)】；

基金：This work was financially supported by the Projects of the National Natural Science Foundation of China (51575184 and 51835003), the National Key Research and Development Program of China (2018YFC080880) and the Fundamental Research Funds for the Central Universities of China (50321071918005).

语种：英文

外文关键词：Ductile fracture prediction; Unified constraint parameter; Two-parameter approach; Cracked pipes; Crack

摘要：In actual engineering cracked components, both in-plane and out-of-plane constraints exist simultaneously, thus it is desirable to develop fracture prediction and assessment methodology incorporating both constraints. The constraint parameters A(p) based on crack-tip equivalent plastic strain and A(d) based on crack-tip opening displacement (CTOD) are two new unified constraint parameters for characterizing both constraints. In this work, by extensive three-dimensional finite element analyses of the parameters A(p) and A(d) for cracked pipes, the crack driving force (CDF) approaches for predicting ductile fracture based on two-parameter J-A(p) and J-A(d) have been investigated and developed. The results show that the two approaches can produce similar prediction results for ductile fracture toughness and initiation load of cracked pipes with different crack sizes. Compared with the fracture prediction based on the conventional single parameter J-integral, the application of the two-parameter approaches can reduce conservatism degree for shallower and shorter pipe cracks with low constraint. Because the parameter A(d) based on CTOD can be easily measured and determined in finite element analyses. Therefore, it is recommended that the J-A(d) approach may be adopted in fracture prediction and assessment of cracked components.