岩石、混凝土和土抗侵彻能力数值计算与分析

利用LS-DYNA3D软件数值计算了弹体侵彻岩石、混凝土和土问题,分析在不同碰撞速度条件下的弹体响应和靶体抗侵彻能力。碰撞速度小于900 m/s时,弹体侵彻岩石的减加速度峰值约是侵彻混凝土的2倍,而侵彻混凝土的减加速度峰值约是侵彻土的6倍。减加速度峰值高则稳态侵彻过程短,弹体能量消耗很快。碰撞速度超过1.5 km/s时,随靶体材料的强度、密度逐渐减小,侵彻深度和孔径逐渐缓慢增加,岩石、混凝土和土3种靶体材料相比,最大侵彻深度增加41%~62%,最大扩孔口径增加16%~25%。

Numerical Computation and Analysis on Anti-Penetration Capability of Rock ,Concrete and Soil

Using LS-DYNA3D to compute the problem of projectile penetrating into rock, concrete and soil targets, we analyze anti-penetration capability of these three materials. We choose HJC concrete constitutive model for target materials in numerical computations. Under the lower and intermediate impact velocities such as from 200 m/s to 900 m/s, rock is evidently more stronger than concrete for anti-penetration. The peak value of deceleration of the projectile penetration into rock is as twice as into concrete. And it is 6 times into concrete than soil. The energy of the projectile dissipated rapidly when the projectile has greater peak value of the deceleration and the steady penetration process is shorter. When the impact velocity is above 1.5 km/s, the effect of material strength on depth or diameter of the penetration becomes gradually decreased. For rock, concrete and soil targets, with gradual decrease of strength, density and compressibility, the depth or diameter of the penetration slowly increased. The maximum of penetration depth increases by 41%~62%, and that of penetration diameter increases by 16%~25%.