双稳态机械异向介质的动能吸收能力对碰撞质量和速度的依赖性
Dependence of the kinetic energy absorption capacity of bistable mechanical metamaterials on impactor mass and velocity
摘要：
使用耗散或散射的替代机制，双稳态结构和机械超材料已经显示出通过可逆地将能量锁定到应变材料中来减轻冲击的有害影响的前景。在这里，我们通过双稳态超材料的冲击吸收扩展以前的工作，计算探索的依赖性的动能传输的速度和质量的冲击，应变率超过$10^2$的$^{-1}$。我们观察到一个很大的依赖于两个冲击参数，从显着更好的性能比比较线性材料差。然后，我们相关的孤立波形成的系统中的性能的变化，并给出分析估计的理想化的能量吸收能力下的动态加载。此外，我们发现一个显着的依赖阻尼伴随着系统内的孤立波传播的定性差异。本研究揭示的复杂动力学为双稳态超材料应用于包括人类和工程系统冲击和冲击保护装置在内的应用提供了潜在的未来指导。
英文摘要：
Using an alternative mechanism to dissipation or scattering, bistable structures and mechanical metamaterials have shown promise for mitigating the detrimental effects of impact by reversibly locking energy into strained material. Herein, we extend prior works on impact absorption via bistable metamaterials to computationally explore the dependence of kinetic energy transmission on the velocity and mass of the impactor, with strain rates exceeding $10^2$ s$^{-1}$. We observe a large dependence on both impactor parameters, ranging from significantly better to worse performance than a comparative linear material. We then correlate the variability in performance to solitary wave formation in the system and give analytical estimates of idealized energy absorption capacity under dynamic loading. In addition, we find a significant dependence on damping accompanied by a qualitative difference in solitary wave propagation within the system. The complex dynamics revealed in this study offer potential future guidance for the application of bistable metamaterials to applications including human and engineered system shock and impact protection devices.
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