水下爆炸载荷下固支方板的动态毁伤模式

Dynamic Damage Mode of Clamped Square Plates Subjected to Underwater Explosive Loading

水下爆炸产生的冲击波是造成水面舰船毁伤的重要原因,研究水下爆炸载荷作用下舰船结构的动态响应和毁伤模式,对提高舰船自身生存能力有着重要的意义。通过对水下爆炸载荷作用下固支方板形变过程中平板边界和中心处的应变变化进行理论分析,并结合有限元仿真方法对不同爆距下受到水下爆炸载荷作用的固支方板动态毁伤进行研究,发现固支方板的破裂方式与爆距有着紧密关系:对于水下爆炸中远场,冲击波几乎同时到达固支方板的中心处和边界处,此时固支方板通常是边界处破裂;只有在近场甚至接触爆炸情况下,爆炸冲击载荷率先到达方板中心处,固支方板才可能出现中心处率先破裂的情况。研究结果证明了固支方板临界破裂压力与平板自身几何尺寸和炸药距离平板的距离有着直接关系。

The shock wave generated by underwater explosion is an important cause of damage to surface ships.The dynamic response and damage modes of ship structure subjected to underwater explosive loading are studied to improve the ship survivability.Theoretical method is used to analyze the strains at the boundary and center of clamped square plate during its deformation,which is caused by underwater explosive loading.In addition,the finite element simulation method is used to research the dynamic damage of clamped square plate subjected to underwater explosive loading at different explosion distances.It is found that the fracture mode is closely related to the explosion distance:the shock wave reaches the center and boundary of fixed square plate nearly at the same time in the case of far field underwater explosion,which causes the boundary of fixed square plate broken firstly;the shock wave reaches the center of square plate before it reaches its boundary,which only occurres in near-field or even contact explosion,and the clamped square plate would be broken at its center firstly.The results prove that the critical fracture pressure of clamped square plate is directly related to its geometrical sizes and the distance between the explosive and the plate.