摘要
以微粒子喷丸为对象,应用ANSYS/LS-DYNA软件对靶材力学性能参数对喷丸残余应力场的影响进行了研究。首先,提出了虚拟钢材模型,其弹性模量、密度、切线模量恒定,而泊松比和屈服极限可变,并通过有限元仿真对其可行性进行了验证。应用虚拟钢材模型,对靶材泊松比和屈服极限对残余应力场的影响进行了研究。结果表明:泊松比对表面残余压应力(SS)具有较大影响,对最大残余压应力(SM)、最大残余压应力深度(HM)和残余压应力层深(HR)影响很小。屈服极限对残余应力场的4个特征值影响显著。最大残余压应力(SM)随屈服极限(σS)增大按对数关系增大;残余压应力层深(HR)随σS增大呈指数关系减小;最大残余压应力深度(HM)则σS随增大按分段线性关系减小:当σS≤300 MPa时,HM以很大的速率线性减小;当σS>300 MPa时,HM以较小的速率线性减小。泊松比和屈服极限对表面残余压应力(SS)存在耦合影响,且具有如下关系SS=1.500μ-0.387σS 0.842。
The effect of target mechanical properties on the residual stress field in microshot peening was studied using ANSYS/LS-DYNA software.Firstly,the virtual steel model was proposed,whose elastic modulus,density and tangent modulus were constant,while Poisson’s ratio and yield limit were variable,and its feasibility was verified by finite element simulation.The influence of Poisson’s ratio and yield limit of target material on residual stress field was studied with the virtual steel model.The results show that Poisson’s ratio has a greater influence on the surface residual compressive stress(SS),while it has little effect on the maximum residual compressive stress(SM),the maximum residual compressive stress depth(HM)and the residual compressive stress layer depth(HR).The yield limit has a significant influence on the four characteristic values of residual stress field.The maximum residual compressive stress(SM)increases logarithmically with the increase of yield limit(σS).The layer depth of residual compressive stress(HR)decreases exponentially with the increase ofσS.The maximum residual compressive stress depth(HM)decreases in a piecewise linear relationship with the increase ofσS:WhenσS≤300 MPa,HM decreases linearly at a large rate.WhenσS>300 MPa,HM decreases linearly at a smaller rate.The Poisson’s ratio and the yield limit have a coupling effect on the surface residual compressive stress(SS),and the relationship is as follows:SS=1.500μ-0.387σS 0.842.
作者
王超
张海
李冬飞
云浩
徐文苏
赵武
Wang Chao;Zhang Hai;Li Dongfei;Yun Hao;Xu Wensu;Zhao Wu(School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo Henan 454000,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2019年第12期238-243,共6页
Heat Treatment of Metals
基金
国家自然科学基金(U1604140)
关键词
微粒喷丸
残余应力场
靶材性能.
microshot peening
residual stress field
target properties
