钢骨架塑料复合管带压开孔的有限元模拟

针对钢丝网骨架塑料复合管在带压开孔施工中的盲目性问题,对钢骨架塑料复合管进行力学分析,建立复合管的力学模型,并对管段模型进行网格划分。运用ANSYS软件对其在不同管径下的最大开孔孔径进行有限元模拟,得到不同开孔孔径下的Mises等效应力分布云图,进而确定最大开孔孔径。结果表明,最大开孔孔径随管径的增加呈线性增加。基于ANSYS仿真结果,通过对管段的密封性进行检测,发现施工条件下管段无介质泄漏现象发生,且未见明显塑性变形。通过现场试验验证了钢骨架塑料复合管的带压开孔模型精度较高,可以为其现场开孔作业提供参考。

Finite element simulation of the hot tapping for steel framed plastic composite pipe

In order to solve the blindness problem of steel mesh framed plastic composite pipe in hot tapping construction,firstly,the mechanical analysis on steel framed plastic composite pipe was carried out,the mechanical model of composite pipe was established,and then the pipe section model was meshed.On this basis,finite element simulation was carried out on the maximum tapping diameter of the pipe under different pipe diameters using ANSYS software.Then the Mises equivalent stress distribution nephogram under different tapping diameters was obtained,which could be used to determine the maximum tapping diameter.The results show that the maximum tapping size increases linearly with the pipe diameter.Based on the ANSYS simulation results,no medium leaking from the pipe or obvious plastic deformation under construction condition is found after testing the pipeline tightness.The test results verify the high accuracy of hot tapping model of the steel framed plastic composite pipe,which can effectively solve the blindness problem existing in the field tapping operation.