文献类型：会议论文

中文题名：Limit loads for part-through surface axially cracked elbows under internal pressure

作者：Chen Wang[1];Yinpei Wang[1];Peining Li[1];Jin Chen[1];Xiaoming Sun[1];

机构：[1]Key Lab of Safety Science of Pressure System, Ministry of Education, School of Mechanical Engineering, East China University of Science and Technology, Shanghai 200237, China;

会议论文集：2010 International Symposium on Structural Integrity(2010国际结构完整性学术研讨会 ISSI 2010)论文集

会议日期：20101021

会议地点：上海

主办单位：华东理工大学

语种：英文

中文关键词：Cracked elbows;Limit loads;FE analyses;Internal pressure

摘要：Elbow is a type of components which has been widely used in a piping system. In practice, the existence of cracks in excess of the defect limits cannot be excluded. So it is very important to know the effect of cracks on the limit loads of elbows for integrity assessment of the piping system. The existing closedform solutions for limit loads of axiaily cracked elbows under internal pressure are either too conservative or inadequate. The present studies focus on plastic limit loads of pressurized elbows with part-through surface axial cracks with constant-depth rectangle configurations. The crack-like defects are postulated to be in extrados, crown or intrados of elbows with different sizes. The limit loads and residual strength factors (RSFs) of cracked elbows with the connecting tangent pipes are investigated in detail, by use of three-dimensionally (3D) non-linear finite element (FE) analyses. The elastic-perfectlyplastic material behavior and geometric nonlinearity are taken into account. The results from comprehensive parametric studies indicate that the limit load of cracked elbows may reduce with increasing of crack length and crack depth, and these trends are more serious for long radius elbows under internal pressure. Base on extensive limit load numeric data and comprehensive parametric studies, the revised closed-form equations for cracked elbows under internal pressure, involving effects of tangent pipes, are established respectively. The results can be used for 'fitness-for-service' assessment of elbow.