球形压力容器埋藏裂纹的影响分析  

Analysis on embedded cracks in the spherical pressure vessel

作　　者：谢芳 刘德俊 秦忠宝 郭志青 XIE Fang;LIU De-jun;QIN Zhong-bao;GUO Zhi-qing(Basic Institute,Rocket Force University of Engineering,Xi’an 710025)

机构地区：[1]火箭军工程大学基础部,陕西西安710025

出　　处：《机械设计》2019年第3期110-116,共7页Journal of Machine Design

基　　金：军队科研基金资助项目(EP2016033100A21105)

摘　　要：疲劳、制造工艺及复杂应力状态都能够产生导致压力容器最终失效断裂的裂纹。鉴于对埋藏裂纹研究的相关文献较少,文中在验证有限元法可靠性的基础上,利用ANSYS及Franc 3D通过有限元法对球形压力容器轴向椭圆埋藏裂纹,从裂纹半径比a/c及扩展的两个方面,探究裂纹尖端张开型应力强度因子KΙ及裂纹面形态的变化。通过数值结果分析发现,a/c=1时可作为裂纹尖端KΙ分布情况和幅度大小的临界条件,而且裂纹在扩展过程逐步由椭圆形趋近圆形,同时不同裂纹角路径下扩展速率由其主导的应力强度因子大小决定。Fatigue,manufacturing processes,and complex stress conditions can produce cracks which result in the final failure of the pressure vessel.Currently,the literature on embedded cracks is rare.In this paper,based on the reliable finite element method,ANSYS and Franc 3D are applied to analyze the crack radius ratio a/c and the expansion of axial elliptical embedded cracks in the spherical pressure vessel.Effort is made to explore the stress-intensity factor KΙof the crack tip and the changes of the crack surface.The numerical results show that a/c=1 serves as the critical condition for the distribution and amplitude magnitude of crack tip KΙ;the crack gradually turns into a circle from an ellipse during the extension process;the expansion rate is determined by the dominated KΙunder different crack-angle paths.

关 键 词：埋藏裂纹 应力强度因子 ANSYS FRANC 3D 扩展 

分 类 号：O346.1[理学—固体力学]