Theoretical analysis of the static and dynamic response of tensor skin
Theoretical analysis of the static and dynamic response of tensor skin
复制标题
张量蒙皮静态和动态响应的理论分析
DOI：
10.1016/j.ijimpeng.2013.10.006
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发表时间：
2014
影响因子：
5.1
通讯作者：
Yu TongXi
中科院分区：
文献类型：
--
作者：
Ren YanTing;Qiu XinMing;Yu TongXi
张量蒙皮是为提高直升机的耐撞性而研制的一种复合材料夹层结构，由蒙皮层、张量层和承载层组成。本文提出了一种分析张量蒙皮静动态响应的理论模型。将张量蒙皮的整体响应分为三个阶段：整体梁的弹性变形阶段、张量铺层的展开阶段和张量铺层的拉伸阶段。在冲击初始阶段，整个梁发生弹性变形，直至覆盖层和承载层断裂，然后剩余的张量层展开并拉伸，以吸收更多的冲击动能，在展开阶段，采用刚塑性材料理想化，提出了具有静止塑性铰的变形机制.结果表明，随着中心挠度的增大，静临界压力先减小后增大。静态临界压力随几何参数的变化而变化，但在展开阶段消耗的总能量与几何参数无关。在展开阶段结束时的剩余动能将被塑性拉伸耗散。分析了阶跃压力和矩形压力脉冲作用下张量蒙皮的动态响应。经验证，理论预测与相应的有限元模拟显示非常好的协议。
Comprised of cover ply, tensor ply and carrying ply, tensor skin is a kind of composite sandwich structure developed to improve the helicopter's crashworthiness in water impacts. In this study, a theoretical model is proposed to analyze the static and dynamic response of a kind of tensor skin. The whole response of tensor skin is divided into three stages: an elastic deformation stage of the whole beam; an unfolding stage of the tensor ply; and a stretching stage of the tensor ply. At the beginning of impact, the whole beam undergoes elastic deformation until the breakage of the cover and carrying plies; then the tensor ply left is unfolded and stretched to absorb more impact kinetic energy.In the unfolding stage, by adopting the rigid, perfectly plastic material idealization, a deformation mechanism with stationary plastic hinges is proposed. It is found that the static critical pressure first decreases then increases with the increasing central deflection. The static critical pressure varies with the geometric parameters, but the total energy dissipated in the unfolding stage is independent of the geometric parameters. The residual kinetic energy at the end of unfolding stage will be dissipated by the plastic stretching. The dynamic responses of the tensor skin are analyzed for step loaded pressure and rectangular pressure pulse. It is verified that the theoretical predictions display very good agreement with the corresponding finite element simulations.