Nonlinear stress wave propagation in 3D woodpile elastic metamaterials

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:58

Article

Kim, Eunho¹  Kim, Yong Han Noel¹  Yang, Jinkyu¹ 

[1] Univ Washington, Aeronaut & Astronaut, Seattle, WA 98195 USA

关键词: Nonlinear wave propagation;    Periodic woodpile structure;    Elastic metamaterial;   

DOI  :  10.1016/j.ijsolstr.2014.12.024

来源: Elsevier

【 摘 要 】

We study the formation and propagation of nonlinear stress waves in 3D woodpile elastic metamaterials consisting of vertically stacked slender cylindrical rods. We find the nonlinear waveforms transmitted through the woodpile architectures under impact are highly sensitive to their design parameters, particularly stacking distances and angles in 3D assemblies. We numerically and experimentally demonstrate that the woodpile system can localize, modulate, and ultimately attenuate propagating nonlinear waves in an efficient manner without relying on material damping. We also show the feasibility of constructing metamaterials with a simultaneous characteristic of high damping and high stiffness by using the controllable wave dispersion in the woodpile structures. These woodpile metamaterials offer enhanced degrees of freedom in manipulating stress waves, thereby offering a new way to design efficient impact protectors with high stiffness. (C) 2014 Elsevier Ltd. All rights reserved.

【 授权许可】

Free