基于裂纹尖端张开角的管道止裂控制研究进展

Research progress on arrest control of pipeline cracking based on Crack Tip Opening Angle

传统基于夏比冲击韧性的双曲线止裂控制模型对于高钢级管道已不再适用,对能源安全输送造成巨大威胁。裂纹尖端张开角(Crack Tip Opening Angle,CTOA)作为具有前景的止裂韧性参数,有望取代夏比冲击韧性形成新的止裂控制方法,但目前相关研究缺乏足够的进展与验证。为此,围绕基于实验室试样的CTOA标准化测试、CTOA测试结果的可转移性、基于CTOA的止裂控制方法3个方面对国内外研究进展进行了综述与剖析,指出当前各项研究存在的争议与不足,分析了后续研究的重点方向,以期推动中国管道止裂控制领域的研究进程及管道建设事业的发展。

The traditional two-curve crack arrest control model based on Charpy impact toughness is no longer suitable for the high-grade steel pipelines,which poses a great threat to the safety of energy transportation.The Crack Tip Opening Angle(CTOA),as a promising crack arrest toughness parameter,is expected to replace the Charpy impact toughness and form a new crack arrest control method.However,there has been no adequate progress and verification in the relevant research by now.Therefore,the latest research progress home and abroad was comprehensively reviewed and discussed from three aspects,which are the standard test of CTOA with laboratory specimens,the transferability of CTOA test results,and the CTOA based crack arrest control method.Meanwhile,the disputes and deficiencies in the current research were pointed out,and the future working direction of the researches was analyzed.It is expected to promote the research process in the field of crack arrest control of pipelines,as well as the development of pipeline construction in China.