摘要
基于接触力学模型,建立了超声滚压加工残余应力分布的理论模型,模拟了不同静压力、进给速度和振幅下的超声滚压加工过程,分析了超声滚压加工后残余应力和等效塑性应变的分布情况。结果表明,试样表面会发生不同程度的塑性变形并产生残余压应力。随着深度的增加,残余压应力逐渐增大,在深度为0.4 mm处达到最大值,之后逐渐转为残余拉应力,最后残余拉应力和残余压应力趋于平衡。随着深度的增加,等效塑性应变先增大后逐渐减小,最后在深度约1 mm处达到0。加工参数中静压力对残余应力和等效塑性应变的影响最为显著,最大残余压应力和等效塑性应变随着静压力的增大而增大,最大残余压应力和最大等效塑性应变分别为-910.07 MPa和0.46。对比残余应力实验和仿真结果,发现二者残余应力随加工参数的变化规律一致,并且误差范围基本保持在10%以内,验证了有限元模型的准确性和有效性。
Based on the contact mechanics model,the theoretical model of residual stress distribution in ultrasonic rolling machining was established,and the ultrasonic rolling machining process with different static pressures,feed velocities and amplitudes was simulated,and the distribution of residual stress and equivalent plastic strain after ultrasonic rolling machining was analyzed.The results show that different degrees of plastic deformation occur and residual compressive stress is generated on the surface of sample.With the increase of depth,the residual compressive stress increases gradually and reaches the maximum value at the depth of 0.4 mm,then gradually be-comes residual tensile stress,and finally the residual tensile stress and residual compressive stress tend to be balance.With the increase of depth,equivalent plastic strain firstly increases and then decreases gradually,and finally reaches 0 at the depth of about 1 mm.A-mong the machining parameters,static pressure has the most significant effect on residual stress and equivalent plastic strain,the maxi-mum residual compressive stress and equivalent plastic strain increase with the increase of static pressure,and the maximum residual compressive stress and the maximum equivalent plastic strain are-910 MPa and 0.46,respectively.Comparing the experimental and simulation results of residual stress,it is found that the variation of residual stress with machining parameters is consistent,and the error range is basically within 10%,which verifies the accuracy and effectiveness of the finite element model.
作者
杜志钢
魏昕
杨宇辉
李毅
DU Zhi-gang;WEI Xin;YANG Yu-hui;LI Yi(School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2023年第5期141-149,共9页
Journal of Plasticity Engineering
基金
广东省重点领域研发计划(2020B090926001)。
关键词
超声滚压
42CRMO钢
残余应力
等效塑性应变
有限元分析
ultrasonic rolling
42CrMo steel
residual stress
equivalent plastic strain
finite element analysis
