锻压技术

基于有限元的长输管道凹陷回弹系数研究

英文标题：Study on rebound coefficient of long distance pipeline sag based on FEM

作者：吕亚峰马廷霞邹海翔刘维洋

分类号：TE973

出版年,卷(期):页码：2017,42(4):194-200

摘要：

目前大多利用经验公式来估算内压卸载后的凹陷深度，并且没有估算外载荷卸载后凹陷深度的公式。以长输管线上常见的X52、X60、X70钢制管道为工程背景，运用ABAQUS软件进行管道结构力学的非线性分析，模拟了管道凹陷的形成及回弹过程。通过对比试验与数值模拟数据，验证了有限元仿真方法的可靠性。分别在外载卸载及内压卸载的情况下分析了各参数（加载深度、压头尺寸、管道尺寸、操作压力、管材性能）对凹陷回弹系数的影响。运用Matlab软件对计算结果进行非线性回归分析，得到回弹系数与各参数的关系表达式。结果表明：外载作用下凹陷的回弹系数变化范围较大，约在0.4~0.8之〖JP3〗间；而内压卸载后凹陷的回弹系数变化范围相对较小，约在1.05~1.3之间。该研究工作有助于管道维护人员对凹陷的回弹量做出合理的估算。

At present, the empirical formula is often used to estimate the sag depth after unloading inner pressure, while there is no formula for that after unloading external load. Therefore, based on the common steel pipeline X52, X60 and X70 as the engineering backgrounds, the nonlinear analysis of the pipeline structure mechanics was carried out by ABAQUS software, and the forming and rebound processes of pipeline sag were simulated numerically. Then, the reliability of the finite element simulation method was verified by comparing experimental data with the numerical simulation data, and the influences of various parameters (loading depth, pressure head size, pipe size, operating pressure and pipe properties) on the rebound coefficient of sag after unloading external load and inner pressure were analyzed respectively. Furthermore, the nonlinear regression analysis on the calculated results was carried out by Matlab software, and the relationship between rebound coefficient and parameters was obtained. The results show that the rebound coefficient of sag has wide variation range of 0.4-0.8 under the external load, and it is relatively small of 1.05-1.3 after unloading inner pressure. The conclusion is helpful for the pipeline maintenance personnel to make a reasonable estimate on the sag rebound.

基金项目：

吕亚峰（1991-），男，硕士研究生 E-mail：435404611@qq.com 通讯作者：马廷霞（1974-），女，博士，副教授 E-mail：823761506@qq.com

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