基于ABAQUS的铝合金超声冲击处理有限元模拟

FE Simulation of Aluminum Treated by Ultrasonic Impact Based on ABAQUS

为了探究超声冲击处理对7A52铝合金材料应力应变的影响,采用有限元分析软件AQAQUS建立了7A52铝合金的超声冲击处理模型,旨在探讨7A52铝合金材料模型中应变率以及超声冲击次数对应力、应变的影响规律。结果表明:材料的应变率和超声冲击次数均会影响应力应变;随着冲击次数的增加,x方向的压应力会增大,且其压应力值存在的深度范围会增大;冲击次数对z方向应力的影响比x方向应力的影响要大;随着冲击次数的增加,沿试板冲击深度方向的等效塑性应变值也会增大,且其最大值位于距离试板冲击表面一定深度范围内;材料在高应变率变形条件下,应变率对等效塑性应变有较大的影响;无论是否考虑应变率的影响,冲击次数对z方向应力的影响都很显著,随着冲击次数的增加,其z方向的应力显著增大,且在相同冲击次数下,冲击点处的z方向应力不考虑应变率影响比考虑应变率影响的数值要大很多。

The finite element model of 7A52 aluminum alloy treated by ultrasonic impact whose purpose is to explore the influence of stress and strain was established based on finite element software ABAQUS.The arm is to explore the influence of strain rate using in 7A52 aluminum alloy material model and the ultrasonic impact times.The results show that the strain rate of materials and ultrasonic impact times can affect the stress and strain.With the increase of impact times,compressive stress of x direction increases,and the depth scope of the compressive stress increases.The influence of impact times on the z direction stress is bigger than the x direction stress.With the increase of impact times,the values of equivalent plastic strain along the direction of plate treated depth also increases,and its maximum values at the plate surface within a certain depth.The strain rate has an significant influence on the equivalent plastic strain when the material＇s deformation at high strain rate.Whether to consider the effects of strain rate,the impact number of times on the z direction stress are very significant.With the increase of impact times,the z direction of the stress increase significantly.The values of z direction of the impact point stress does not consider the strain rate effect is much larger than considering the effects of strain rate under the same impact times.