铸造镁合金的材料性能测试和喷丸处理的有限元数值分析

Material Properties Test and Finite Analysis of Shot Blasting for Die Cast Magnesium Alloy AM60

作为目前最轻的金属结构材料之一,镁合金在汽车、航空航天等行业具有广阔的应用前景.但其模铸构件表面粗糙,循环加载时极易产生疲劳裂纹并加剧扩展.因此在工业生产中常对其进行喷丸处理以提高表面质量进而实现改善构件性能的目的.在MTS试验机上对铸造镁合金AM60在不同温度条件下的应力应变关系进行了研究,并利用ANSYS对喷丸处理时不同速率(80m/s,120m/s,160m/s)的钢丸冲击铸造镁合金板的过程进行了模拟分析.结果表明,铸造镁合金板残余应力和塑性应变在温度相同时,随着冲击速率的增大而增加;而在冲击速率相同时,随着温度升高塑性应变增加而残余应力减小.

The poison’s ratio of plane plate samples taken from AM60 Magnesium Alloy is test. And a number of strain controlled fatigue experiments are also carried out on MTS to investigate the stress-strain behavior under different temperature conditions. The finite element analysis software ANSYS is employed to simulate impact process of shot blasting. Results indicate that at the specific temperature condition the residual stress and plastic strain increases with impact velocity increases. At the specific impact velocity, residual stress reduces and plastic strain increases with temperature increases.