摘要
体积型缺陷特别是凹坑缺陷是管线腐蚀最常见的一种形式。该文对含凹坑缺陷的直管与弯管进行了内压爆破试验,缺陷形状为球形、沿轴向与环向分布的椭球形,载荷为内压,极限压力的求解方法有GB/T19624-2004(直管)、大变形非线性弹塑性有限元分析。有限元失效模拟的结果与爆破试验结果吻合较好。通过有限元方法与试验的分析,发现缺陷沿轴线分布对极限压力影响较大,并建立了直管与弯管含体积型缺陷的内压极限载荷估算式。
The volume defects, especially the pitting defects, are very common when the pipeline is corroded. The burst test is performed on the straight and circular arch pipes, which have pitting defects and are subjected to internal pressure. The shape of defects is spherical and long spherical in axial and circular directions. The collapse pressure is calculated by large displacement nonlinear elastic-plastic finite element method and GB/T19624-2004 （in straight pipe）. The numerical results and failure modes of finite element method are in good agreement with burst tests. The finite element method and the burst test result both show that the defects in axial direction have larger influence on the collapse load. The calculation formulas of plastic limit load for bent and straight pressured pipeline with 3D defects are put forward.
出处
《工程力学》
EI
CSCD
北大核心
2009年第8期20-25,共6页
Engineering Mechanics
关键词
极限载荷
拱形管
爆破试验
非线性有限元分析
体积形缺陷
collapse load
circular arch pipe
burst test
nonlinear finite element method
volume defects
