标题： 三维打印的空心椭圆柱渐变晶格中的非线性波传播 显示英文标题

标题： Nonlinear Wave Propagation in 3D-Printed Graded Lattices of Hollow Elliptical Cylinders

摘要： 我们提出了一种由中空椭圆柱体（HECs）制成的3D打印梯度晶格，作为一种设计冲击缓解系统的全新方法。我们在具有逐渐增加和减少刚度的梯度HEC链中观察到了非对称动力学行为。具体来说，增加刚度的链表现出传播波的加速，而减少刚度的链则表现出相反的效果。从冲击缓解的角度来看，减少刚度的链结合HECs的应变软化行为，与增加刚度的链相比，在力衰减方面有了数量级的提升。我们将这一发现扩展到梯度2D阵列，并展示了增加和减少刚度晶格之间波传输效率对比的类似趋势。本研究中展示的3D打印HEC晶格可以推动新型冲击缓解和吸震结构的发展。 显示英文摘要

摘要： We propose a 3D-printed graded lattice made of hollow elliptical cylinders (HECs) as a new way to design impact mitigation systems. We observe asymmetric dynamics in the graded HEC chains with increasing and decreasing stiffness. Specifically, the increasing stiffness chain shows an acceleration of the propagating waves, while the decreasing stiffness chain shows the opposite. From the standpoint of impact mitigation, the decreasing stiffness chain combined with the strain-softening behavior of HECs results in an order-of-magnitude improvement in force attenuation compared to the increasing stiffness chain. We extend this finding to the graded 2D arrays and demonstrate a similar trend of wave transmission efficiency contrast between the increasing and decreasing stiffness lattices. The 3D-printed HEC lattices shown in this study can lead to the development of a new type of impact mitigating and shock absorbing structures.