初始裂纹对超高压容器疲劳寿命的影响研究  

Influence of initial cracks on fatigue life of ultra-high-pressure vessels

作　　者：高耀东[1] 王壮壮 郭忠亮 GAO Yao-dong;WANG Zhuang-zhuang;GUO Zhong-liang(Mechanical Engineering School,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学机械工程学院,内蒙古包头014010

出　　处：《机电工程》2021年第11期1506-1512,共7页Journal of Mechanical & Electrical Engineering

基　　金：内蒙古自治区自然科学基金资助项目(2018MS05032)。

摘　　要：为了更准确地预测超高压容器的使用寿命,研究了初始裂纹尺寸对于超高压容器疲劳寿命的影响。首先,通过ASME中的断裂力学分析计算方法,对超高压容器中表面裂纹的疲劳裂纹寿命进行了计算;其次,使用该方法对不同初始裂纹尺寸下的应力强度因子以及疲劳扩展循环次数进行了计算;最后,对比分析了初始裂纹对应力强度因子、疲劳裂纹扩展寿命的影响。研究结果表明:通过该计算方法可以计算出超高压容器相应表面裂纹的疲劳裂纹扩展寿命,且不同初始裂纹尺寸首次扩展循环次数占总体疲劳扩展循环次数的9.379%至28.057%不等,占比较大;通过与应力强度因子计算结果结合可知:初始裂纹深度尺寸对整体疲劳裂纹扩展寿命影响较大,且在裂纹疲劳扩展中,裂纹深度方向尺寸的影响要大于裂纹长度方向尺寸。In order to predict the service life of ultra-high-pressure vessels more accurately,the influence of the initial crack size on the fatigue life of ultra-high-pressure vessels was studied.Firstly,the fatigue crack life of the surface crack in the ultra-high-pressure vessel was calculated by the fracture mechanics analysis method in ASME.Secondly,the stress intensity factor and the number of fatigue propagation cycles under different initial crack sizes were calculated by the method.Finally,the influence of initial cracks on stress intensity factor and fatigue crack growth life was comparatively analyzed.The results show that this method can calculate the fatigue crack propagation life of the corresponding surface crack of ultra-high-pressure vessels,and the number of first propagation cycles of different initial crack sizes varies from 9.379%to 28.057%of the total fatigue propagation cycles,which is relatively large.Combining with the results of stress intensity factor calculation,it is found that the size of the initial crack depth has a great influence on the overall fatigue crack growth life,and the size of the crack depth direction has a greater influence than the size of the crack length direction in the fatigue crack growth.

关 键 词：高压容器 疲劳寿命 初始裂纹 ASEM规范 断裂力学 寿命计算 

分 类 号：TH49[机械工程—机械制造及自动化]