近爆场下固支铝合金圆板的动态响应研究

对2024-T3铝合金圆板在近爆场下进行了爆炸冲击试验，利用Henrych经验公式与有限元法分别进行了计算和数值模拟，对比了近爆场的冲击波超压，考察了铝合金圆板的动态响应特性与变形失效模式，分析了药量及爆距的影响.结果表明:在爆炸冲击载荷的作用下，随着载荷的增强，即随着药量的增大、爆距及比例距离的减小，固支铝合金圆板呈现出3种变形失效模式、塑性变形、中心拉伸破孔失效、中心破孔，并发生圆板开裂；塑性变形首先在铝合金圆板的固支边界处产生，随后迅速扩展到板中心区域；随着比例距离的减小，发生中心拉伸破孔板的破孔尺寸逐渐增大，而发生边界拉伸断裂板的鼓包程度逐渐减小. 

Dynamic Response of Fully Clamped Circular Aluminum Alloy Plate Subjected to Near Field Explosion

A explosive shock experiment on 2024-T3 circular aluminum alloy plate subjected to near field explosion was conducted. Calculations and numerical simulations were implemented with Henrych empirical formula and finite element method, respectively. Shock wave overpressure under near field explosion was compared. Dynamic response characteristics and deformation failure modes of circular aluminum alloy plate were studied, and influences of charge weights and stand-off distances were analyzed. The results showed that under the influence of the impact load, with the increasing of loads, that is, with the increase of charge weight and the decrease of stand-off distance and scaled distance, three kinds of deformation and failure modes of fully clamped circular aluminum alloy plate were exhibited in the following ways:plastic deformation, rupture (tensile failure) with broken hole in the center and rupture with broken hole and fracture of the plate; the plastic deformation first occurred at the fixed boundary of the plate, and then rapidly extended to the central area of the plate; with the increase of stand-off distances, the amplitude of the midpoint displacement of the plate without failure increased in the balance position under the same charge weight. With the decrease of scaled distances, the broken hole size of the plate with rupture in the center gradually increased, and the bulge degree of the plate with tearing in the boundary gradually declined.