低约束试件断裂韧性测试方法研究进展  

RESEARCH PROGRESS OF FRACTURE TOUGHNESS TEST METHOD FOR LOW CONSTRAINT SPECIMENS

作　　者：武旭[1] 帅健[1] 许葵[1] WU Xu;SHUAI Jian;XU Kui(College of Safety and Ocean Engineering,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)安全与海洋工程学院,北京102249

出　　处：《力学与实践》2020年第5期535-542,共8页Mechanics in Engineering

基　　金：国家自然科学基金资助项目(51874324)。

摘　　要：低约束试件断裂韧性测试对油气管道安全运营具有重要意义。本文回顾了低约束试件断裂韧性测试方法及发展过程,介绍了裂纹尖端张开位移(crack tip opening displacement,CTOD)和J积分等常用断裂韧性表征参数,并对断裂韧性测试中应力强度因子、J积分塑性因子、J积分与CTOD转换因子、裂纹尺寸测量方法、数字图像相关方法等关键问题进行对比分析,总结需要深入研究的问题,为低约束试件断裂韧性测试发展提供一定依据。The fracture toughness test of low constraint specimens is of great significance for the safe operation of oil and gas pipelines. In this paper, the existing fracture toughness testing methods and the development process of low constraint specimens are reviewed, and the common fracture toughness characterization parameters such as crack tip opening displacement(CTOD) and J-integral are introduced. The key problems such as the stress intensity factor, the J-integral plasticity factor, the J-integral and CTOD conversion factor, the crack size measurement method, and the digital image correlation method, in the fracture toughness test, are analyzed, and the problems that need to be further studied are summarized, to provide a necessary basis for the development of fracture toughness test of low constraint specimens.

关 键 词：低约束 单边缺口拉伸试件 断裂韧性 J积分 裂纹尖端张开位移 

分 类 号：TE832[石油与天然气工程—油气储运工程]