超声冲击处理对不同材料的应力应变影响的有限元模拟

FINITE ELEMENT SIMULATION OF STRESS-STRAIN TREATED BY ULTRASONIC IMPACT TREATMENT ON DIFFERENT MATERIALS

采用有限元的方法建立了不同材料力学性能的超声冲击处理模型。根据Johnson理论得出的冲击动力学公式,找到影响应力应变的关键参数:弹性模量、泊松比以及静态屈服强度。分别讨论了弹性模量、泊松比以及静态屈服强度对超声冲击处理后材料应力应变的影响,旨在探讨超声冲击处理对不同力学性能材料的应力应变强化程度。结果表明:材料的弹性模量、泊松比以及静态屈服强度都会影响超声冲击处理的应力应变;材料的弹性模量越大,其冲击处平行于材料表面方向应力和等效塑性应变都会显著增大;材料的泊松比越大,x方向应力和等效塑性应变都会增加,但泊松比对等效塑性应变影响大于x方向应力的影响;随着静态屈服强度的增大,冲击处的x方向应力显著增大,等效塑性应变值显著降低。

Using finite element method to establish different materials mechanical properties of ultrasonic impact treatment model. According to the theory of Johnson, the formula of impact dynamics have found the key parameter of stress and strain ： elastic modulus, poisson＇s ratio, and the static yield strength. The effects of elastic modulus, poisson＇s ratio and the initial yield strength of material treated by ultrasonic impact on stress and strain were discussed Respectively. The ann is to explore the stress and strain in different mechanical properties of materials treated by ultrasonic impact . The results show that elastic modulus, poisson ratio and initial yield strength of material can affect the stress and strain. With the increase of elastic modulus, compressive stress of x direction and equivalent plastic strain can increases. With the increase of poisson ratio, stress of x direction and equivalent plastic strain will increase, but the poisson ratio on the equivalent plastic strain greater than x direction stress. With the increase of the initial yield strength, stress of x direction will increase, and equivalent plastic strain reduced significantly.