裂纹前沿网格参数对皮带轮应力强度因子的影响  

Influence of crack front grid parameters on stress intensity factor of pulley

作　　者：翁剑成[1] 张皓诚 丁兴波 黄亿捷 WENG Jian-cheng;ZHANG Hao-cheng;DING Xing-bo;HUANG Yi-jie(College of Physics and Mechanical and Electrical Engineering,Longyan College,Longyan 364000,China)

机构地区：[1]龙岩学院物理与机电工程学院,福建龙岩364000

出　　处：《机电工程》2022年第4期519-523,共5页Journal of Mechanical & Electrical Engineering

基　　金：福建省大学生创新创业训练计划资助项目(S202111312057);福建省自然科学基金面上项目(2021J011087);龙岩学院第七批[2021年]教育教学改革研究资助项目(2021JG11)。

摘　　要：针对皮带轮三维裂纹体端面网格数和轴向网格数的优化问题,基于应力强度因子理论,对皮带轮张开型表面裂纹前沿的网格参数进行了正交实验研究。首先,研究了正交设计理论和应力强度因子的位移法计算原理;然后,在皮带轮应力集中位置,建立了一定大小的裂纹,并对该裂纹的应力强度因子进行了有限元计算;最后,用正交设计方法设计了裂纹体周边网格的不同因数水平的实验方案,根据I型最大应力强度因子结果,对裂纹体周边网格数进行了研究。研究结果表明:径向网格数对皮带轮裂纹I型最大应力强度因子影响最灵敏,其次是周向网格数,而轴向网格数最不灵敏;经过正交优化后,该裂纹体最佳网格划分的径向网格数为8,周向网格数为16,轴向网格数为15。Aiming at the optimization to determine the number of meshes on the end face and axial meshes of a three-dimensional cracked body,the grid parameters of the crack front of the belt pulley with opening surface crack were studied by orthogonal experiments based on the stress intensity factor theory.Firstly,the orthogonal design theory and the displacement method calculation principle of the stress intensity factor were studied.Secondly,a crack of a certain size was established at the stress concentration position of the spinning pulley and the stress intensity factor of the crack was calculated.Finally,the orthogonal design method was used to design the experimental schemes of different factor levels of the grid around the cracked body.According to the results of the I-type maximum stress intensity factor,the number of grids around the cracked body was studied.The results show that the radial mesh number has the greatest impact on the maximum stress strength factor of belt wheel crack type I,followed by the number of circumferential mesh,and the axial mesh number has the least impat.After orthogonal optimization,as the best grid division scheme for the crack structure:the radial grid number is 8,the number of circumferential grid is 16,and the number of axial grids is 15.

关 键 词：皮带轮 三维裂纹体 应力强度因子 正交实验设计 网格数 

分 类 号：TH132[机械工程—机械制造及自动化]