基于有限元的裂纹应力强度因子影响因素分析

Analysis of Influencing Factors of Crack Stress IntensityFactor Based on Finite Element

采用ANSYS软件建立了含埋藏裂纹的压力管道有限元模型,计算了仅受内压下管道埋藏裂纹的应力强度因子,分析了裂纹尺寸、管道壁厚、偏心距、压力载荷对应力强度因子的影响。结果表明:有限元分析计算结果与标准GB/T 19624-2019中的公式计算结果很接近,证明有限元分析得到的应力强度因子是精准可靠的;当裂纹尺寸越大、壁厚越小、裂纹中心越偏离壁厚中心、压力载荷越大时,对应的裂纹应力强度因子越大,裂纹对管道危害就越大。

The finite element model of the pressure pipeline with buried cracks is established by ANSYS software,the stress intensity factor of the pipeline buried cracks only under internal pressure is calculated,and the effects of crack size,pipeline wall thickness,eccentric distance and pressure load on the stress intensity factor are analyzed.The results show that the calculation results of the finite element analysis are very close to the calculation results of the formula in the standard GB/T 19624-2019,which proves that the stress intensity factor obtained by the finite element analysis is accurate and reliable.When the crack size is larger,the wall thickness is smaller,the crack center is farther away from the wall thickness center,the pressure load is larger,the corresponding crack stress intensity factor is larger,and the crack is more harmful to the pipeline.