基于ANSYS Workbench有限元法的外腐蚀管道失效压力研究

为确定管道的服役状况、保证管道安全运行、延长管道总体使用寿命以及科学指导管道安全生产管理,需要对管道剩余强度进行准确评估。借助ANSYS Workbench软件,模拟了含有矩形、球形、圆柱形外腐蚀缺陷管道的等效应力,分析了缺陷尺寸对管道失效压力的影响规律。结果表明,不论管道外腐蚀缺陷形状如何,缺陷深度增加均会明显降低失效压力;矩形外腐蚀缺陷的轴向长度、圆柱形外腐蚀缺陷的长度均与失效压力大小呈负相关;矩形外腐蚀缺陷周向长度、球形外腐蚀缺陷半径均对失效压力影响不明显;圆柱形外腐蚀缺陷的半径与失效压力呈正相关。

Study on the External Corrosion Failure Pressure of Pipeline Based on ANSYS Workbench Finite Element Method

The residual strength of the pipeline has been evaluated for determining the service status of the pipeline, ensuring the safe operation of the pipeline, extending the overall service life of the pipeline and scientifically providing the guidance to the safety production management of the pipeline. The equivalent stress of the pipeline with different shapes of external corrosion defects: rectangular,spherical and cylindrical shapes were simulated by ANSYS Workbench software and the relationship between defect size and failure pressure was analyzed. The results show that the failure depth can significantly reduce the failure pressure regardless of the shapes of external corrosion defects. There is a negative correlation between the axial length and the length of cylindrical external corrosion defects, while a positive correlation between the radius of cylindrical external corrosion defects and failure pressure. The influence of circumferential length of rectangular external corrosion defects and radius of spherical external corrosion defects on failure pressure is not obvious.