文献类型：期刊文献

英文题名：Limit Load Analysis of Pressure Structures Containing Pitting Defects Subjected to High Temperature Creep

作者：Wang, Ning[1];Liu, Hong-qi[1,2]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Shanghai 200237, Peoples R China

年份：2016

卷号：57

期号：4

起止页码：501

外文期刊名：MATERIALS TRANSACTIONS

收录：;EI(收录号：20161602250900);WOS:【SCI-EXPANDED(收录号:WOS:000376226500005)】；

基金：The authors gratefully acknowledge the financial supported by the Projects of the National Natural Science Foundation of China (51405159) and the Natural Science Foundation of Shanghai (14ZR1410900).

语种：英文

外文关键词：high temperature creep; plasticity-damage due to creep; pitting defect; limit load; safety assessment

摘要：High-temperature technologies are widely used in many industries and the high temperature components are usually designed for long term operation. Creep damages are inevitable in service, which may lead to the loss of material strength. Volumetric defects such as pits may occur during the manufacturing process and during service. These defects may cause severe reduction of the limit load of structures. The existing assessment procedures do not take into account the effect of plasticity-damage due to creep, which may lead to inaccurate assessment results. This paper aims to investigate the limit load of pressurized components with volumetric defect subjected to high temperature creep. An elasto-plastic constitutive model with coupled plasticity-damage due to creep effects is proposed. The limit load of high temperature structures with volumetric defects is systematically studied using finite element method. Safety assessment approach for structures considering plasticity-damage due to creep effect is subsequently proposed based on the principle of "fitness for service".