冰碰载荷下船用泡沫铝夹层板冲击动力响应研究

Research on Dynamic Response of Hull Foam Aluminum Sandwich Plates under Ice Impact Load

文中利用ANSYS/LS-DYNA有限元软件,建立了楔形冰碰撞载荷下船用泡沫铝夹层板的动态冲击数值仿真模型,并开展了船体板-冰碰撞实验对冰材料模型进行了实验验证,研究了泡沫铝夹层板动态冲击响应.在此基础上,对比分析了冰体撞击和刚体撞击情况下对泡沫铝夹层板动态冲击响应的差异.结果表明:冰体撞击和刚体撞击情况下对泡沫铝夹层板的上面板变形模态出现明显差异.与刚体撞击相比,冰体撞击泡沫铝夹层板由于冰体破碎会导致能量耗散,从而使得泡沫铝夹层板吸收能量和产生的塑性变形都较前者低.最后研究了冰碰速度和芯层厚度对泡沫铝夹层板动态冲击响应的影响规律.

Through ANSYS/LS-DYNA finite element software,the dynamic impact numerical simulation model of marine foam aluminum sandwich plate under wedge-shaped ice collision load was established,and the hull plate-ice collision experiment was carried out to verify the ice material model and study the dynamic impact response of foam aluminum sandwich plate.On this basis,the differences of dynamic impact response to foam aluminum sandwich plate under ice body impact and rigid body impact were compared and analyzed.The results show that the deformation modes of the upper panel of the foam aluminum sandwich plate are obviously different under the conditions of ice body impact and rigid body impact.Compared with rigid body impact,ice body impact on foam aluminum sandwich plate will lead to energy dissipation due to ice body breakage,thus making the foam aluminum sandwich plate absorb energy and produce lower plastic deformation than the former.Finally,the influence of ice collision speed and core thickness on the dynamic impact response of foam aluminum sandwich plate was studied.