内嵌负泊松比型耦合蜂窝结构的共面冲击响应

In-plane impact response of coupled honeycomb structure with embedded negative Poisson's ratio

为提升蜂窝结构共面的力学性能,引入了内凹负泊松比结构,并将其内嵌到传统六边形蜂窝共面孔隙内,复合成一种新型内嵌负泊松比型耦合蜂窝结构。利用显式动力学有限元方法研究了内嵌负泊松比型耦合蜂窝结构的共面在不同冲击速度作用下的冲击响应特性和能量吸收能力。结果表明:耦合蜂窝结构的变形模式受到冲击速度和耦合角的影响;耦合蜂窝结构冲击端和固定端的名义应力-名义应变曲线与其变形模式和耦合角有关,且耦合角越大,名义应力水平越低;耦合蜂窝结构的平台应力和比吸能均随着耦合角的增大而减小,在高速冲击时,其平台应力降低2%~9%,比吸能降低7%~20%;相对密度影响耦合蜂窝结构的平台应力和能量吸收能力。

To improve the in-plane mechanical properties of honeycomb structure,the structure with concave negative Poisson's ratio was introduced and embedded into the traditional hexagonal honeycomb in-plane hole to form a new type coupled honeycomb structure with embedded negative poisson's ratio.The impact response characteristics and energy absorption capacity of the coupled honeycomb structure in-plane with embedded negative Poisson's ratio with different impact velocities were studied through the explicit dynamic finite element method.The results show that the deformation mode of coupled honeycomb structure is affected by impact velocity and coupling angle,and the nominal stress-nominal strain curves at impact end and supporting end of coupled honeycomb structure are related to its deformation mode and coupling angle,and the larger the coupling angle is,the lower the nominal stress level is.The plateau stress and specific energy absorption of the coupled honeycomb structure decrease with the increase of the coupling angle,the plateau stress is reduce by 2%-9% and specific energy absorption is reduce by 7%-20% under high velocity impact.The relative density affects the plateau stress and energy absorption capacity of the coupled honeycomb structure.