CAJ | 학술논문

破前漏（LBB ）分析是一种先进的管道分析评价技术，其关键技术是裂纹的稳定性分析，决定着LBB技术的可用性。本文从核级管道的失效模式出发研究了LBB分析的裂纹稳定性分析问题，并探讨了修正 J积分撕裂模量汇交方法（J-T方法）、修正极限载荷分析法以及两倍弹性斜率法的优缺点和适用范围，最后通过工程算例对不同分析方法进行检验，其结论可为我国核电站管道的 LBB设计提供参考。
파전루（LBB ）분석시일충선진적관도분석평개기술，기관건기술시렬문적은정성분석，결정착LBB기술적가용성。본문종핵급관도적실효모식출발연구료LBB분석적렬문은정성분석문제，병탐토료수정 J적분시렬모량회교방법（J-T방법）、수정겁한재하분석법이급량배탄성사솔법적우결점화괄용범위，최후통과공정산례대불동분석방법진행검험，기결론가위아국핵전참관도적 LBB설계제공삼고。
The leak before break (LBB) analysis is an advanced assessment technology for pipes .The key technology of LBB is the crack stability analysis ,which decides the usability of the LBB approach .The crack stability analysis problem was studied based on the failure mode of the nuclear grade pipes in this paper .Advantage ,disadvantage and application range of the modified J-integral tearing modulus intersection method ( J-T method) ,modified limit load method and twice elastic slope method were discussed . Finally ,aforementioned methods were applied to an engineering example to verify their validity .Conclusions of this paper can provide some references for the application of the LBB approach to the nuclear power stations of China .