17号锻造钩尾框浅表裂纹扩展特性分析和剩余寿命预测  

RESIDUAL LIFE PREDICTION AND CRACK GROWTH PROPERTY ANALYSIS FOR NO.17 GORGER COUPLER YOKE WITH SHALLOW SURFACE CRACK

作　　者：景致明 刘宇杰[1] 张娟[1] 康国政[1] JING ZhiMing;LIU YuJie;ZHANG Juan;KANG GuoZheng(School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学力学与工程学院,成都610031

出　　处：《机械强度》2022年第5期1238-1242,共5页Journal of Mechanical Strength

摘　　要：针对钩尾框裂纹大多为深度较小,长度较长的浅表裂纹的情况,对17号锻造钩尾框的浅表面裂纹扩展进行有限元模拟。分析了表面裂纹在扩展过程中的形状变化,并对具有不同初始长度和初始深度浅表裂纹的钩尾框剩余寿命进行了预测。结果表明,钩尾框椭圆表面裂纹在扩展过程中会发生形状改变,趋于狭长。对深度0.5 mm和1 mm,不同长度的初始浅表裂纹钩尾框剩余寿命模拟表明锻造钩尾框具有较高的抗断裂性能。对于相同初始长度与深度的裂纹,中间裂纹较之边角裂纹更危险。基于模拟结果,得到了不同初始长度的中间裂纹和边角裂纹的钩尾框剩余寿命预测公式。In view of the fact that most of the cracks in the coupler yoke are surface cracks with small depth and long length, the shallow surface crack propagation was simulated by FEA method for No.17 forged coupler yoke. The shape change of the surface crack was analyzed in the process of crack propagation, and the residual lives were predicted for the coupler yokes with different initial length and depth cracks. The results show that the shape of the elliptical surface crack of the coupler yoke changes and tends to be narrow and long during the propagation process. In the case of 0.5 mm and 1 mm initial crack depth, the residual lives of the coupler yokes were simulated for various crack lengths, and simulated results show that the forged coupler yoke has high anti-fracture resistance. For crack with the same initial length and depth, intermediate crack is more dangerous than corner crack. Based on the simulation results, a residual life prediction formula is obtained for the coupler yoke with the intermediate crack and corner crack under different initial crack lengths.

关 键 词：17号钩尾框 浅表面裂纹 裂纹形状 裂纹扩展 剩余寿命 

分 类 号：U270.34[机械工程—车辆工程] O346.1[交通运输工程—载运工具运用工程]