能量输入对TC4钛合金超声喷丸力学影响的仿真研究

Simulation Study on Effect of Energy Input on Mechanical Properties of TC4 Titanium Alloy by Ultrasonic Shot Peening

目的探究超声喷丸强化中影响目标强化区域冲击力分布的主要因素,验证通过改变工艺参数控制零件目标区域强化的可行性。方法构建TC4钛合金超声喷丸强化的有限元模型,分别建立了聚合型和圆柱型两种腔室模型,以研究超声喷丸中不同腔室能量分布对冲击力分布的影响。通过改变振动头的振幅大小控制超声喷丸中能量输入,以研究能量输入大小对冲击力分布的影响。结果针对两种腔室模型分别进行了60、80、100μm振幅下的超声喷丸仿真。随着能量输入的增大,零件表面的冲击力大小和分布面积均有所增大。针对圆柱型腔室,进行三种能量输入下的超声喷丸试验,得到喷丸覆盖率分别为10.23%、31.23%、56.98%,验证了超声喷丸能量输入对冲击力的影响规律。在相同输入能量下,聚合型腔室对试件中部目标区域的强化效果更明显。结论通过改变超声喷丸腔室形状和振动头振幅,可以控制零件目标区域的强化范围和强度。

The work aims to explore the main factors affecting the distribution of impact force during ultrasonic shot peening,and verify the feasibility of changing process parameters to control the strengthening area of the target part.The finite element model of TC4 titanium alloy by ultrasonic shot peening was established.Convergent chamber and cylindrical chamber were established to study the effect of energy distribution in different chambers on impact force distribution during ultrasonic shot peening.The energy input was controlled by changing the amplitude of the vibration to study the influence of energy input on impact force distribution.The simulation of ultrasonic shot peening was carried out for two chambers under the amplitude of 60 μm,80 μm and 100 μm.With the increase of energy input,the value and distribution area of the impact force increased.For the cylindrical chamber,the USP test under three kinds of energy input was carried out,and the obtained coverage was 10.23%, 31.23%,and 56.98%,thus the effect of ultrasonic peening energy input on the impact force was verified.The convergent chamber had more obvious strengthening effect on the middle target area of the test piece under the same energy input.During USP,the strengthening range and intensity of the target area of the parts can be controlled by changing the shape of the chamber and the amplitude of the vibration head.