层状复合结构的应力波传播规律及能量耗散机制研究

Stress wave propagation law and energy dissipation mechanism of layered composite structure

为研究层状复合结构的应力波特性和能量耗散机制,设计了碳化硅陶瓷/超高分子量聚乙烯/钛合金(SiC/UHMWPE/TC4)和SiC/TC4/UHMWPE两种复合结构,并进行了SHPB(split-Hopkinson pressure bar)试验和数值模拟。基于金属丝缠绕材料(entangled metallic wire material,EMWM)出色的能量耗散性能,设计了SiC/UHMWPE/EMWM/TC4和SiC/TC4/EMWM/UHMWPE复合结构,并进行了SHPB试验。结果表明,复合结构中的EMWM对应力波的透射传播具有延迟和阻碍效应。EMWM复合结构主要通过反射大部分入射能量来耗散冲击能量,相比于其他复合结构主要通过SiC的破坏来耗散冲击能量相比,EMWM复合结构的能量耗散机制更合理,抗冲击性能更好。UHMWPE置于SiC的背部可以充分发挥UHMWPE和EMWM的缓冲性能,减小SiC的损伤。而TC4置于SiC的背部会加剧SiC的损伤。

Here,to study stress wave characteristics and energy dissipation mechanism of layered composite structure,two composite structures of silicon carbide ceramic/ultra-high molecular weight polyethylene/titanium alloy TC4(SiC/UHMWPE/TC4)and SiC/TC4/UHMWPE were designed,and their split Hopkinson pressure bar(SHPB)tests and numerical simulation were conducted.Based on excellent energy dissipation performance of entangled metallic wire material(EMWM),SiC/UHMWPE/EMWM/TC4 and SiC/TC4/EMWM/UHMWPE composite structures were designed,and their SHPB tests were conducted.The results showed that EMWM in composite structures has delay and hindrance effects on transmission and propagation of stress wave;EMWM composite structure mainly dissipates impact energy by reflecting most of incident energy;compared with other composite structures dissipating impact energy mainly through destruction of SiC,EMWM composite structure has more reasonable energy dissipation mechanism and better anti-impact performance;UHMWPE placed on back of SiC can give full play to cushioning performance of UHMWPE and EMWM and reduce damage of SiC,while TC4 placed on back of SiC can aggravate damage of SiC.