聚乙烯压力管道裂纹快速扩展性及止裂性研究进展

Development of Research on Rapid Propagation and Arrest of Cracks in Polyethylene Pressurized Pipelines

许多工程问题是由于流 (气 )体压力导致了结构开裂 ,裂纹会迅速扩展或者止裂 ,这被认为是断裂动力学最前沿的研究领域。在这篇文章中介绍了聚乙烯 (PE)管材抗快速裂纹扩展评价方法的研究进展 ,简述了正在完善的标准方法的试验原理和试验装置 ,对我国在此领域的研究工作提出了建议。陈述了一些与快速扩展及其止裂相关的动态断裂问题 ,并将有限元编码方面的一些发展用来模拟断裂管道行为 。

There are many instances where fluid pressure acting on the structure caused the structure to cracking and the cracks could be propagated rapidly or arrestded,which is regarded as the most advanced research field in dynamic fracture.The information and development which are related to polyehtylene pipes estimation methods of resistanc to crack propagation are described,including the principle and apparatus of test.Several dynamic analysis issues relating to rapid propagation and arrest in gas pipelines are presented in this paper.Some developments have been implemented into this finite element code to simulate the behavior of the fractured pipes.For the calculation of crack driving force,the numerical approaches using the nodal force release and energy balance methods are described.