轻质可变形弹体冲击6061-T651铝合金板的数值模拟研究

NUMERICAL SIMULATION STUDY OF LIGHTWEIGHT-DEFORMABLE PROJECTILE IMPACT 6061-T651 ALUMINUM ALLOY PLATE

为研究铝合金靶板抗不同强度和头部形状的弹体冲击时的弹道性能、失效模式与能量耗散情况,利用Abaqus有限元软件建立了不同强度的轻质可变形弹体冲击3 mm厚6061-T651铝合金靶板的三维模型,并采用修正后的Johnson-Cook(MJC)本构模型和Lode参数相关的修正后的Mhor-Coulomb(MMC)断裂准则进行数值模拟计算。结果表明,采用低强度的6061-T651铝合金作为弹体材料时,靶板对应的弹道极限最高,并且靶板的弹道极限随着弹体强度的增加而降低;当弹体强度较低时,冲击作用将会造成靶板更为复杂的失效模式,同时弹体头部均发生了不同程度的塑性变形;弹体强度对靶板能量耗散能力有明显的影响。轻质可变形平头弹对应的弹道极限高于卵形头弹。

In order to investigate the ballistic performance,failure patterns and energy dissipation of aluminum alloy target plates against the impact of different strength and head shape projectiles,the three-dimensional models of 3 mm thick 6061-T651 aluminum alloy target plates impacted by lightweight-deformable projectiles of different materials were established by Abaqus finite element software,and the modified Johnson-Cook(MJC)constitutive model and the Lode-dependent modified Mhor-Coulomb(MMC)fracture criterion are used for numerical simulation.The results show that the corresponding ballistic limit velocity of the target plates are the highest when the low strength 6061-T651 aluminum alloy are used as the projectile material,and the ballistic limit velocity of the target plates decrease with the increase of the projectiles strength.The impact will cause a more complex failure patterns of the target plates when the projectiles strength is low,and at the same time,the plastic deformation of the projectiles head occur to different degree;the projectiles strength has a significant effect on the energy dissipation ability of the target plates.The ballistic limit velocity corresponding to the lightweight-deformable blunt-head projectiles are higher than that of the ogival-head projectiles.