扭转载荷下柱形压力容器裂纹扩展分析  

Analysis on crack propagation of cylindrical pressure vessels with torsional load

作　　者：邹子杰 秦忠宝 刘德俊 孟飞 ZOU Zi-jie;QIN Zhong-bao;LIU De-jun;MENG Fei(Basic Department,Rocket Force University of Engineering,Xi'an 710025;School of Misile Engineering,Rocket Force University of Engineering,Xi'an 710025;45 Unit,96037 Troop,People's Liberation Army of China)

机构地区：[1]火箭军工程大学基础部,陕西西安710025 [2]火箭军工程大学导弹工程学院,陕西西安710025 [3]中国人民解放军96037部队45分队

出　　处：《机械设计》2020年第4期93-99,共7页Journal of Machine Design

基　　金：国家自然科学基金资助项目(51605481)。

摘　　要：扭转是柱形压力容器常见的受力情况,长时间在这种工况下工作会衍生出多种裂纹,这些裂纹会随着压力容器的使用进而发生扩展甚至断裂,严重影响了设备的结构强度、使用寿命及使用安全性。因此利用ANSYS,FRANC 3D有限元分析软件开展了在扭转载荷作用下裂纹应力强度因子的变化规律,以及裂纹扩展路径和扩展形貌的研究。结果表明,扭转载荷下试件主要以滑移型和撕开型扩展为主,且不同深长比的半椭圆裂纹在扩展过程中尖端应力强度因子分布规律基本一致,最终裂纹的扩展形貌均为长椭圆形。Torsion is a common stress for cylindrical pressure vessels. Various cracks will be caused when pressure vessels work under this circumstance for a long time. The cracks will expand or even break,which seriously affects the structural strength,service life and safety of pressure vessels. Therefore,the ANSYS and FRANC 3D finite-element software are adopted to explore the variation of stress-intensity factors,propagation path and morphology when the torsional load is exerted. The results show that under this circumstance,slip-type and tear-type cracks are dominant,and the distribution of stress-intensity factors at the tip of semi-elliptical cracks with different depth-length ratios is basically identical. Finally,for propagation path and morphology,long ellipse is identified.

关 键 词：应力强度因子 裂纹扩展 ANSYS FRANC 3D 

分 类 号：O346.1[理学—固体力学]