考虑喷丸残余应力的齿根裂纹扩展计算方法  

Calculation method of root crack propagation considering residual stress of shot peening

作　　者：徐向阳[1] 时慧一 樊林放 XU Xiangyang;SHI Huiyi;FAN Linfang(Chongqing Key Laboratory of Public Transportation Equipment Design and System Integration,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学公共交通装备设计与系统集成重庆市重点实验室,重庆400074

出　　处：《中南大学学报(自然科学版)》2025年第3期932-940,共9页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2023YFB4203402);国家自然科学基金资助项目(52375042)。

摘　　要：为了解决喷丸冲击残余应力影响下齿根裂纹扩展计算方法缺乏的问题,首先,基于线弹性断裂力学理论,耦合残余应力与裂纹闭合效应,采用修正的Paris法构建裂纹扩展模型,分析在不同喷丸条件下残余应力场对裂纹扩展行为的具体影响;其次,联合预置裂纹的单齿裂纹扩展模型和有限元-离散元(FEM-DEM)喷丸模型,提出齿根残余应力裂纹扩展计算方法,获得不同喷丸参数下的残余应力场;最后,探究喷丸强化残余应力与齿根弯曲应力耦合复合应力场对齿根裂纹扩展行为的影响。研究结果表明:在喷丸强化作用下,残余压应力影响区域内裂纹尖端的应力强度因子显著降低,导致裂纹闭合力增大,裂纹闭合效应增强,裂纹扩展门槛提高,从而有效抑制了裂纹扩展;在次表面上,喷丸残余应力对裂纹的抑制作用最明显,并随裂纹深度增加而减弱。In order to solve the problem of lack of calculation method for crack propagation under the influence of shot peening residual stress,firstly,based on the theory of linear elastic fracture mechanics,the modified Paris method was used to construct the crack propagation model by coupling the residual stress and crack closure effect.The specific influence of residual stress field on crack propagation behavior under different shot peening conditions was analyzed.Secondly,a computational method for residual stress-induced crack propagation was proposed by integrating a single-tooth preset crack propagation model and a finite element-discrete element(FEM-DEM)shot peening model,and the residual stress field with different shot peening parameters was obtained.Finally,the influence of the combined stress field of shot peening residual stress and root bending stress on the crack propagation behavior of the tooth root was investigated.The results show that shot peening significantly reduces the stress intensity factor at the crack tip within the residual compressive stress region.Shot peening increases the crack closure force and enhances the crack closure effect.This increases the crack propagation threshold and effectively inhibits the crack growth.The inhibitory effect of residual stress is the most pronounced in the subsurface region,but gradually weakens as crack depth increases.

关 键 词：喷丸强化 疲劳裂纹扩展 残余应力 数值模拟 应力强度因子 

分 类 号：TG668[金属学及工艺—金属切削加工及机床]