文献类型：期刊文献

英文题名：In-plane and out-of-plane constraint characterization of different constraint parameters for semi-elliptical surface cracks in 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, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2020

卷号：235

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20202708894868);WOS:【SCI-EXPANDED(收录号:WOS:000559761200007)】；

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).

语种：英文

外文关键词：Constraint parameters; In-plane constraint; Out-of-plane constraint; Semi-elliptical surface cracks; Pipes

摘要：Six constraint parameters (namely T-stress, Q, h, T-z, A(d) and A(p)) have been numerically calculated for semi-elliptical surface cracks in pipes so as to comparatively investigate their capability, applicability and ease of use for characterizing in-plane and out-of-plane constraints. The results show that the parameters T-stress and T-z can separately characterize in-plane and out-of-plane constraints. The crack depth a/t and aspect ratio a/c of semi-elliptical cracks can influence both in-plane and out-of-plane constraints. With decreasing a/c (increasing crack length) and increasing crack depth a/t, both in-plane and out-of-plane constraints increase. The parameters Q and stress triaxiality factor h are equivalent, and they can capture both in-plane and out-of-plane constraints for the cracks in pipes. But they may overestimate constraint for longer cracks with lower a/c. The parameters A(d) and A(p) based on crack-tip plastic deformation (or strain) can equivalently characterize both in-plane and out-of-plane constraints for the cracks in pipes. The advantages and limitations of different constraint parameters in terms of their engineering applications are analyzed and appropriate parameters are recommended.