轴向裂纹对U型管强度的影响  

The effect on the strength of U-tube with axial crack

作　　者：魏明业[1] 刘景新[1] 刘乃江[2] 李俊超[2] 

机构地区：[1]唐山市特种设备监督检验所,河北唐山063000 [2]河北联合大学,河北唐山063009

出　　处：《节能》2013年第10期17-22,共6页Energy Conservation

基　　金：河北省质量技术监督局项目(项目编号:2011ZD17)

摘　　要：针对在高温和管道压力作用下U型管的弯管处容易产生裂纹,这些裂纹对U型管上应力的分布产生严重影响,降低的了U型管的承载能力。本文采用ABAQUS软件对存在轴向裂纹的U型管进行分析,得到不同长度、深度及多个不同位置裂纹间相互作用对U型管强度的影响。分析结果表明,裂纹的长度与深度之比越小,裂纹对U型管强度的削弱效果越小,反之越大。U-tube is widely used in chemical equipment. Under high temperature and pressure it is easy to emerge crack at the elbow of the U-tube,the cracks seriously affected the stress distribution on the U-tube and it seriously reduced the carrying capacity of the U-tube. By using ABAQUS software analysis the U-tube which exists axial crack,it can get the influence on the strength U-tube which own different length, depth and the interaction between several different locations on the Utube crack. The results show that the ratio of the crack length and depth is smaller,the effect on the strength of the U-tube is smaller,the greater on the contrary; the influence of cracks longitudinally aligned on the strength of the U-tube is much greater than the cracks horizontally aligned; as the increases of depth on crack the stress concentration at the bottom and the end will gradually stabilize or even decrease; the influence on strength of the crack inside the U-tube is much larger than the cracks located elsewhere.

关 键 词：U型管 裂纹 有限元 应力集中 强度 

分 类 号：TQ050.3[化学工程]