A modified fracture assessment method for pipelines under combined inner pressure and large-scale axial plastic strain

作者：Jia, Pengyu; Jing, Hongyang; Xu, Lianyong^*; Han, Yongdian; Zhao, Lei

来源：Theoretical and Applied Fracture Mechanics, 2017, 87: 91-98.

DOI：10.1016/j.tafmec.2016.10.007

• Engineering critical assessment
• In-service pipeline
• Limit load solution of Kastner
• Optimised reference stress method

Owing to ground movement, in-service pipelines may be subjected to large scale axial plastic strain. Therefore, determining the fracture capacity of pipelines with crack-like defects is a key issue that needs to be addressed. In this study, to conduct an engineering critical assessment (ECA) for in-service pipelines, the limit load solution of Kastner for pipelines with circumferential surface cracks under tension was modified based on the von Mises yield criterion. Then, the limit load solution of Kastner was adapted to the situation under combined inner pressure and axial plastic strain. Furthermore, the optimised reference stress method was applied to improve the accuracy of the ECA for in-service pipelines. Finally, the formula for the non-dimensional parameter, gamma, was developed.

• 出版日期2017-2
• 单位天津大学