基于有限元法的平滑凹痕管道应力分析

针对管道上典型的平滑凹痕缺陷,根据管道的实际运行状况,建立了有限元模型；在其它参数不变的情况下,改变凹痕深度、管道壁厚、管道直径和凹痕纵向长度进行了大量计算；对计算结果进行了整理、归纳、作图,并对结果进行了单因素和多因素分析,得出应力随各参数的变化规律；采用非线性回归分析方法对计算结果进行了拟合.结果表明,在其它参数不变的情况下,凹痕管道最大应力与凹痕深度、壁厚、管径以及凹痕纵向长度之间的关系分别采用正弦模型、指数模型、线性模型和半对数线性模型最优,并且得到了具有一定适用范围下的具体关系式.

Stress analysis of plain dent on pipeline based on finite element method

For the typical plain dent on pipeline,according to the actual operation situation of the pipeline,the finite element models were established. When other parameters were invariable, a large number of calculations were carried out by changing dent depth,pipe wall thickness,pipe diameter and longitudinal dent length. The calculation results were sorted,inducted, and plotted. On this basis,the results were analyzed by single factor and multiple factors analysis,and then the changing rules between the stress and various parameters were obtained. Non-linear regression analysis was utilized to fit the results. The results show that the relationships between the maximum stress in the dented pipeline,the dent depth,wall thickness,diameter of pipeline,and the longitudinal length of the dent were modeled by sine,index,linear and semi-log liner function,respectively. Some specific expression are obtained in certain range.