文献类型：期刊文献

中文题名：内压及扭矩载荷下无缺陷弯管的应力分析

英文题名：STRESS ANALYSIS OF UNDEFECTED PIPE BENDS UNDER THE LOADS OF INTERNAL PRESSURE OR TORSION

作者：郭茶秀[1];魏新利[1];刘宏[1];李培宁[2]

机构：[1]郑州大学化工学院,郑州450002;[2]华东理工大学机械学院,上海200237

年份：2002

卷号：24

期号：3

起止页码：391

中文期刊名：机械强度

外文期刊名：Journal of Mechanical Strength

收录：CSTPCD;;Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

基金：国家教委博士点基金项目资助 (1 9990 2 51 0 2 )~~

语种：中文

中文关键词：弯管;内压;扭矩;应力

外文关键词：Pipe bends; Internal pressure; Torsion; Stress

摘要：分析在内压或扭矩载荷作用下非均匀壁厚椭圆弯管的应力分布 ,结果表明内压引起的最大应力随着弯管的截面不均匀度而变化 ,由此解释了工程实际中弯管失效的原因 。
It is well-known that the pipe bends can absorb the expansion of the piping and play an important role in the piping system. Much work has been published on the stress analysis of the smooth pipe bends. However, pipe bends manufactured by straight pipes with circular cross sections cause to geometric irregularities, such as cross section ovality and variation in thickness. Such geometric irregularities have influence on the behavior of pipe bends under internal pressure, torsion or bending moment loading, give additional stress and decrease its load carrying ability. So it's necessary to know the real stress distribution to avoid failure in engineering. Here theoretical study on constant thickness circular cross section has been extended to deal with thickness variation and elliptical cross section, the loading is internal pressure or torsion. The circumferential stress equation for pipe bends with nonuniform thickness wall is obtained which conforms to finite element result. So it's easier to know the stress distribution by the theoretical solution. Then the stresses situation of pipe bends with elliptical cross section and nonuniform thickness wall are also studied, the results show that the maximum stress due do internal pressure changes with the degree of nonuniformity. Therefore, the failure reasons for pipe bends are explained, which is in agreement with the engineering examples. All the stress in extrados, cross and intrados can be quickly got by the theoretical equations presented here. Meanwhile, a basis method has been provided to study the plastic collapse load for pipe bends.