TC4钛合金超声喷丸强化残余应力数值模拟分析

Numerical Simulation Analysis of Residual Stress in Ultrasonic Shot Peening of TC4 Titanium Alloy

为了探究 TC4 钛合金超声喷丸过程中喷丸参数对残余应力的影响规律,基于 ABAQUS 建立了 TC4 钛合金超声喷丸强化的 3 维有限元模型,分别从超声喷丸模型中振动头振幅、弹丸数量和弹丸直径的变化对 TC4 钛合金表层及亚表层残余应力分布的影响进行了分析。结果表明:随着振动头振幅和弹丸直径的增加,试件表面及亚表面每层残余压应力分布范围及残余压应力值均增大,残余压应力层深度增加;随着弹丸数量的增加,仅能提高每层残余压应力的值,对残余压应力层深度影响较小。

In order to investigate the influence rules of shot peening parameters on residual stress during ultrasonic shot peening of TC4 titanium alloy,a three-dimension finite element model of ultrasonic shot peening of TC4 titanium alloy was established based on ABAQUS. The influences of vibration head amplitude,spheres number and diameter on the residual stress distribution in the surface and subsurface layers of TC4 titanium alloy were analyzed from the ultrasonic shot model. The results show that with the increase of vibration head amplitude and spheres diameter,the distribution range of residual compressive stress and residual compressive stress value of each layer on the surface and subsurface of the specimen increase,and the depth of residual compressive stress layer increases. With the increase of the spheres number,the value of residual compressive stress spheres number layer can only be increased,and the influence on the depth of residual compressive stress layer is small.