不同加筋结构在水中接触爆炸下的破损规律

Damage of different reinforced structures subjected to underwater contact explosion

采用LS-DYNA对不同加筋强度和不同加筋位置的筋板结构的水中接触爆炸进行了数值模拟,定义描述不同加筋强度、位置的强度因子和距离因子,建立不同强度因子的6种加筋模型和不同距离因子的3种加筋模型。通过对水中接触爆炸下典型加筋结构破损过程分析和不同模型纵、横破口长度和破口面积的对比,得到了加筋板在水中接触爆炸下强度因子、距离因子对破口形状和大小的影响规律。结果表明:增大纵横方向强度因子能有效抑制破口面积,增大横向强度因子对破口无明显影响;药量一定情况下,距离因子与破口面积成正比,破口形状与距离、强度因子相关。

LS-DYNA was used to simulate the responses of different reinforced structures subjected to underwater contact explosion by considering different reinforcement strengths and locations.Strength and distance factors were defined to describe the strength and locations of stiffeners,respectively.Six models were proposed with different strengths of stiffeners and three models were developed with different locations of stiffeners.Typical damage processes of the reinforced structures were analyzed.The horizontal and vertical crack lengths of crevasse were compared as well as crevasse area.The effects of the strength and distance factors were found on the reinforced structures subjected to underwater contact explosion.The results show that it can be effective to restrain crevasse area when the strength factor rises in the vertical direction and it is not significant when the strength factor rises in the horizontal direction.The distance factor is in direct proportion to crevasse area and the crevasse shapes are related to both of the two factors defined.