球形压力容器的裂纹应力强度因子分析  

Crack Stress Intensity Factor Analysis of Spherical Pressure Vessels

作　　者：桑立彪 Sang Libiao(Ningxia Special Equipment Inspection and Testing Institute,Guyuan Ningxia 756000,China)

机构地区：[1]宁夏特种设备检验检测院,宁夏固原756000

出　　处：《机械管理开发》2024年第2期20-22,25,共4页Mechanical Management and Development

摘　　要：为探究双材料球形压力容器裂纹初始角度对于裂纹应力强度因子的影响,以N6-Q345双材料球形压力容器作为研究对象,通过建立有限元模型进行数值模拟的方式模拟N容器不同的裂纹初始角度,并结合相互积分作用法对应力强度因子进行计算。结果表明:裂纹Ⅰ型、Ⅱ型应力强度因子会随着裂纹初始角度增大而增大,但Ⅱ型应力强度因子会在裂纹初始角度为45°时达到最大值,超过45°则会降低;高强度性能Q345材料侧的裂纹尖端应力强度因子要始终高于低强度性能N6材料侧的裂纹尖端应力强度因子;J积分、等效应力强度因子会随着初始角度的增大而增大,但Ⅰ型应力强度因子占据主导地位,裂纹更易向着高强度材料(Q345)界面侧发生扩展。In order to investigate the effect of initial crack angle on the stress intensity factor of a bimaterial spherical pressure vessel,N6-Q345 bimaterial spherical pressure vessel was taken as the research object.By establishing a finite element model for numerical simulation,different initial crack angles of N vessel were simulated,and the stress intensity factor was calculated using the interaction integration method.The results show that the TypeⅠand TypeⅡstress intensity factors of cracks increase with the increase of the initial angle of the crack,but the TypeⅡstress intensity factor reaches its maximum value at an initial angle of 45°,and decreases when it exceeds 45°;The stress intensity factor at the crack tip on the high-strength Q345 material side should always be higher than that on the low-strength N6 material side;The J-integral and equivalent stress intensity factor will increase with the increase of the initial angle,but the TypeⅠstress intensity factor dominates,and cracks are more likely to propagate towards the interface side of high-strength materials(Q345).

关 键 词：球形压力容器 裂纹 应力强度因子 复合材料 

分 类 号：TH49[机械工程—机械制造及自动化]