文献类型：期刊文献

英文题名：Unified constraint-based FAD assessments for ductile fracture in 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：2020

卷号：185

外文期刊名：INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING

收录：;EI(收录号：20202408811921);WOS:【SCI-EXPANDED(收录号:WOS:000546903400004)】；

基金：This work was financially supported by the Projects of the National Natural Science Foundation of China (51975212 and 51835003), the National Key Research and Development Program of China (2018YFC080880) and the Fundamental Research Funds for the Central Universities (50321071918005).

语种：英文

外文关键词：Unified constraint parameter; Failure assessment diagram; Ductile fracture prediction; Cracked pipes; Crack

摘要：In this work, the unified constraint-based FAD (failure assessment diagram) assessment methodology has been investigated and developed for ductile fracture in cracked pipes. Two unified constraint parameters A(p) and A(d) are utilized to incorporate both in-plane and out-of-plane constraints. The results show that the FAD approaches based on two-parameter K-A(p) and K-A(d) can predict similar fracture initiation loads. With decreasing crack length and depth, the constraint level decreases and fracture toughness increases, thus the predicted fracture load increases. For some shallow and short pipe cracks with lower constraints, the unified constraint-based FAD assessment can reduce conservatism degree of the conventional FAD assessment. For some deep and long cracks, their constraint levels may be higher than the standard plane strain specimen, and the application of the unified constraint-based FAD assessment approaches may eliminate non-conservative assessment in the conventional FAD approach. The unified constraint-based FAD approaches and CDF (crack driving farce) approaches using parameters A(p) and A(d) can produce similar fracture prediction results, thus they are basically equivalent.