垂直围壁对爆炸载荷作用下固支方板动力响应特性影响分析

采用数值仿真方法研究了垂直围壁对爆炸载荷作用下固支方板动力响应特性的影响.提出包含角的概念来反映围壁高度的变化.采用控制变量法对264组具有垂直围壁方板模型的动力响应进行了计算,分析了包含角、炸药质量、板厚、相对爆距等变量对方板所受爆炸冲量和中心点位移的影响.结果表明,垂直围壁会增大目标方板所受爆炸冲量,当围壁高度增大到一定程度后,爆炸冲量趋于一定值;无量纲冲量-I仅与包含角和相对爆距有关,并提出了相应经验公式.文中同时提出了一个考虑垂直围壁影响的中心点挠厚比计算公式,并对其适用范围进行了讨论.

Influence of Vertical Surroundings on the Dynamic Response of Fixed Square Plate Subjected to Blast Loading

The dynamic response of fixed square plates with different heights of vertical surroundings subjected to blast loading was studied by using numerical simulation. The covering angle concept was proposed to express the change of the surroundings height. By using the control variable method, the dynamic response of 264 square plates with vertical surroundings was analyzed, and the influence of the covering angle, explosive mass, plate thickness as well as relative detonation distance on the explo?sion impulse and midpoint deflection of the square plates was investigated. The results show that the existence of vertical surroundings will increase the explosion impulse acting on the target plate. When the height of the surroundings reaches up to a critical value, the value of the explosion impulse will reach its maximum and keep a constant. An empirical formula was proposed to predict the dimension?less impulse Iˉ, which is only related to the covering angle and the relative detonation distance. More?over, another empirical formula was proposed to predict the midpoint deflection-thickness ratio of the plate considering the influence of the vertical surroundings, and its applicability was discussed.