基于位错密度的铝合金塑性损伤模型

Plastic Damage Model of Aluminum Alloys Based on Dislocation Density

通过分子动力学方法模拟铝合金拉伸变形行为,得到材料拉伸过程中内部位错密度的变化规律。进而结合基于位错密度的弹塑性本构,在Lemaitre提出的塑性损伤模型基础上,建立了基于位错密度的塑性损伤模型。该模型综合考虑了位错、硬化、应变等诸多因素,有效的反映了金属材料塑性损伤的微观机理。

The tensile deformation behavior of aluminum alloy was simulated by molecular dynamics method, and the variation of dislocation density in the tensile process was obtained. Combining the elastic-plastic constitutive model based on dislocation density,the plastic damage model based on dislocation density is established on the basis of Lemaitre＇s plastic damage model. The model takes into account dislocation, hardening, strain and other factors, and effectively reflects the micro-mechanism of plastic damage of metal materials.