文献类型：期刊文献

英文题名：Unified constraint parameter solutions for axial and circumferential surface cracks in pressurized pipes under creep condition

作者：Ma, H. S.[1];Wang, G. Z.[1];Liu, S.[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：2018

卷号：189

起止页码：307

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20174804465951);WOS:【SCI-EXPANDED(收录号:WOS:000425215700020)】；

基金：This work was financially supported by the Projects of the National Natural Science Foundation of China (51375165, 51575184 and 51325504) and the Fundamental Research Funds for the Central Universities (222201718005).

语种：英文

外文关键词：Unified constraint parameter; Creep; Axial crack; Circumferential crack; Pressurized pipes

摘要：Unified creep constraint parameter Ac for axial and circumferential surface cracks in pressurized pipes have been calculated and investigated by three-dimensional finite element method. It has been shown that the parameter Ac can effectively characterize in-plane and out-of-plane creep constraints in pressurized pipes. The overall constraint levels of pipe cracks increase with increasing crack depth, length, pipe wall thickness and radius-thickness ratio. The parameter Ac solutions have been obtained for different pipe geometries and crack sizes. In creep life assessments of pressurized pipes, the overall constraint effect can be incorporated by the unified constraint parameter Ac. For shallower and shorter surface cracks in pipes, more benefits can be gained by incorporating constraint effect. (C) 2017 Elsevier Ltd. All rights reserved.