论文部分内容阅读
为了分析AZ31镁合金帽状试样在冲击载荷作用下的局域变形行为及绝热剪切的产生过程,采用LS-DYNA有限元软件对其进行2D数值模拟。结果表明,在冲击速率为18 m/s的载荷作用下,在沿着冲击方向呈45°的切应力方向上产生局域变形,变形量累积至一定值将产生绝热剪切和断裂。采用霍普金森压杆实验获得的绝热剪切带组织为动态再结晶细晶组织,硬度明显高于剪切带外组织的平均硬度。
In order to analyze the local deformation behavior and the adiabatic shear process of AZ31 magnesium alloy cap under impact load, 2D numerical simulation was carried out by LS-DYNA finite element software. The results show that under the load of 18 m / s, local deformation occurs in the direction of shear stress of 45 ° along the impact direction. When the deformation reaches a certain value, adiabatic shear and fracture will occur. Adopting the Hopkinson pressure bar experiment, the adiabatic shear band structure is a dynamic recrystallized fine grain structure, the hardness is obviously higher than the average hardness of the shear band.