金属材料在重复冲击下的损伤演化

为了探究金属材料在重复冲击下的损伤演化规律,基于Lemaitre损伤演化模型,提出了两种损伤演化方程建立方法:直接法和修正法.基于这两种方法建立了7075铝合金的损伤演化方程,并对两种损伤演化方程进行了对比研究,结果表明:直接法和修正法得到的损伤演化方程形式不同,但其损伤演化曲线十分相似,对试样失效前的可冲击次数预测十...

Damage Evolution of Metal Materials under Repeated Impact Load

In order to explore the damage evolution law of metal materials under repeated impact load, two methods based on Lemaitre damage evolution model for establishing damage evolution equations, direct method and modified method, are proposed. The damage evolution equations of 7075 aluminum alloy are established based on these two methods, and the two damage evolution equations are compared. The results show that the damage evolution equations obtained by the direct method and the modified method are different, but their damage evolution curves are similar, and the prediction of the number of impact times before failure is approximate. Through the comparison with the experimental values, it is considered that the two damage evolution equations have high accuracy in predicting the repeated impact life in a certain range.