摘要
针对目前难以准确获得压力容器缺陷裂纹临界值aN的状况,通过基于空气动力压力容器安全评定的缺陷失效路径与失效速率的仿真系统,来寻找裂纹缺陷在安全临界域速率拐点及准确获取aN的临界值的计算方法。反映缺陷"安全裕度"的射线法或平行线法并不能反映缺陷真实的动态安全程度,而应该是沿着缺陷的失效路径来进行标定缺陷趋近安全临界线的距离,而这个距离真实反映了缺陷的剩余循环疲劳次数,进而建立一种全新的评估压力容器剩余寿命的理论判据。
It is difficult to obtain critical values of pressure vessel defect cracks accurately. In order to solve this problem, the safety e- valuation simulation system for the failure rate and paths of the crack on the aerodynamic pressure vessel was used to find the inflection point of the failure rate in safety critical region and the threshold of aN. The ray method or parallel method did not reflect She real level of dynamic security, but the defects along the failure path which reaches safety critical distance and this distance really reflected the re- maining number of cyclic fatigue defects, and a new theory criterion for pressure vessel residual life prediction was established.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2012年第4期204-208,共5页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(51075286)
关键词
压力容器
安全评定
失效仿真
安全裕度
剩余寿命
pressure vessel
safety assessment
failure simulation
safety margin
residual life
