利用ABAQUS软件,采用控制变量法和无量纲分析法,求解只含轴向或环向多腐蚀缺陷管道的等效应力,并提出了管道多腐蚀缺陷间的相互作用准则、判定流程和影响因素;在考虑腐蚀缺陷间相互作用效应的情况下,结合控制变量法,对处于复杂腐蚀状态下含多腐蚀缺陷的管道的剩余强度进行了数值模拟,并提出了剩余强度变化系数;采用正交试验设计法,分析了影响腐蚀管道剩余强度的主、次要因素。结果表明:当只有轴向或环向腐蚀缺陷时,轴向间距系数是影响管道应力状态的主要因素;当腐蚀轴向间距大于 Dt 时,腐蚀缺陷间无相互作用;当轴向、环向均有腐蚀缺陷时,腐蚀长度系数和腐蚀宽度系数是影响管道剩余强度的主要因素,腐蚀深度系数和轴向间距系数次之。

Using ABAQUS software, the control variable method and dimensionless analysis method were used to solve the equivalent stress of pipelines with only axial or circumferential multiple corrosion defects, and the interaction criteria, determination process and influencing factors between multiple corrosion defects of pipelines were proposed. Considering the interaction effect between corrosion defects, combined with the control variable method, the residual strength of pipelines with multiple corrosion defects under complex corrosion conditions was numerically simulated, and the residual strength variation coefficient was proposed. The main and secondary factors affecting the residual strength of corroded pipelines were analyzed by orthogonal test design method. The results showed that when there were only axial or circumferential corrosion defects, the axial spacing coefficient was the main factor affecting the stress state of the pipeline. When the corrosion axial spacing was greater than Dt, there was no interaction between corrosion defects. When there were corrosion defects in both axial and circumferential directions, the corrosion length coefficient and the corrosion width coefficient were the main factors affecting the residual strength of the pipeline, followed by the corrosion depth coefficient and the axial spacing coefficient.