高温蠕变下P12管道断裂力学参数变化的数值模拟研究

Numerical Simulation Study on the Change of Fracture Mechanical Parameters of P12 Pipeline under High Temperature Creep

金属材料在高温、低应力环境下长时间服役时容易发生蠕变断裂,具有极大的危害性。某石化企业P12蒸汽管道在远低于设计寿命的情况下发生了蠕变断裂失效。为研究该P12蒸汽管道在高温蠕变情况下其裂纹尖端应力强度因子的变化情况,采用ANSYS有限元软件建立该P12蒸汽管道的有限元计算模型并得到了其裂纹尖端应力强度因子的分布情况。研究结果表明,随着蠕变情况加剧,该P12蒸汽管道裂纹发生断裂破坏的风险不断升高。

Metal materials were prone to creep rupture when they were used for a long time in a high temperature and low stress environment,which was extremely harmful.Creep rupture failure occurred in the P12steam pipeline of a petrochemical enterprise far below the design life.In order to study the change of the stress intensity factor at the crack tip of the P12 steam pipeline under the condition of high temperature creep,the finite element calculation model of the P12 steam pipeline was established by using ANSYS finite element software,and the distribution of the stress intensity factor at the crack tip was obtained.The results of the study showed that as the creep situation intensified,the risk of fracture failure of the P12 steam pipeline crack increased.