针对腐蚀造成管道承载能力降低的问题, 研究了管道缺陷评价方法。基于形状改变比能强度准则(Mises强度准则), 推导了管道极限承载力的计算公式, 采用ANSYS有限元仿真软件对理论计算得出的结果进行分析验证。建立了等深度方形腐蚀缺陷管道的有限元模型, 针对不同几何参数的腐蚀缺陷, 得出腐蚀缺陷深度、长度和宽度对缺陷管道极限承载力的影响规律。仿真结果表明, 腐蚀缺陷深度是影响管道极限承载力的最主要因素, 腐蚀缺陷长度到达某一特定值后对极限承载力的影响平缓, 腐蚀缺陷宽度对管道极限承载力存在微弱的加强作用。

In response to the reduction of the pipeline carrying capacity caused by corrosion, the pipeline defect assessment methods were studied. Based on the distortion energy intensity criterion of Mises, the formulation of pipeline ultimate bearing capacity was derived, theoretical calculation results were compared with the results of ANSYS finite element analysis software. An iso-depth square corrosion pipeline model was established. The influences of corrosion defect depect depth, length and width on the ultimate bearing capacity of pipeline defects was studied for the corrosion defects with different parameters. Simulation results showed that corrosion defect depth was the most important factor;as the corrosion defect length reached a certain value, the ultimate bearing capacity kept unchanged;the corrosion defect width strengthened the ultimate bearing capacity very weakly.