聚脲涂覆铝板水下冲击特性数值模拟研究

Numerical investigation of polyurea coated aluminum plate response subjected to underwater impact

近距离水下爆炸冲击是舰船抗爆防护的难点,而具有应变率强化效应的聚脲涂层为水下冲击防护提供了新的思路。基于非药式水下爆炸冲击加载方法,利用数值模拟方法对聚脲涂覆圆形铝板靶板施加高强度水下冲击载荷,对水下冲击作用下靶板的变形过程进行描述,重点讨论了冲击波初始峰值和聚脲涂敷厚度与位置对6061铝合金圆板变形的影响规律。以聚脲涂覆铝板最终残余挠度来衡量抗水下冲击性能,随着加载速率的增加,聚脲涂敷铝板的抗水下冲击性能随之增加,同时聚脲涂敷在铝板的受载面抗水下冲击性能最佳。相关结论可为舰船、海工建筑等抗水下冲击设计提供指导。

The close underwater explosion is difficult for ship explosion protection,and polyurea coating with strain rate strengthening effect provides a new idea for underwater impact protection.Based on the non-explosive underwater impact loading method,the high-strength underwater impact load was applied to the polyurea coated circular aluminum plate target by numerical simulation method.The deformation process of the target under underwater impact was described.The effects of the initial peak value of shock wave and the thickness and position of polyurea coating on the deformation of 6061aluminum alloy circular plate were discussed.The resistance to underwater impact is measured by the final deformation value of polyurea coated aluminum plate.With the increase of strain rate,the resistance to the underwater impact of the polyurea coated aluminum plate increases,and the resistance to the underwater impact of polyurea coated aluminum plate is the best.The relevant conclusions can provide guidance for the anti underwater impact design of ships and marine structures.