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Bending dominated response of layered mechanical metamaterials alternating pentamode lattices and confinement plates

机译:五层晶格和约束板交替出现的层状机械超材料的弯曲支配响应

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摘要

A numerical study on the elastic response of single-and multi-layer systems formed by alternating pentamode lattices and stiffening plates is presented. Finite element simulations are conducted to analyze the dependence of the effective elastic moduli of such structures upon suitable aspect ratios, which characterize the geometry of the generic pentamode layer at the micro-and macro-scale, and the lamination scheme of the layered structure. The given numerical results highlight that the examined structures exhibit bending-dominated response, and are able to achieve low values of the effective shear modulus and, contemporarily, high values of the effective compression modulus. We are lead to conclude that confined pentamode lattices can be regarded as novel metamaterials that are well suited for seismic isolation and impact protection purposes. Their elastic response can be finely tuned by playing with several geometrical and mechanical design variables. (C) 2016 Elsevier Ltd. All rights reserved.
机译:数值研究了交替的五模格子和加劲板形成的单层和多层系统的弹性响应。进行了有限元模拟,以分析此类结构的有效弹性模量与合适纵横比的相关性,这些纵横比在微观和宏观尺度上表征了通用五模层的几何形状以及层状结构的层压方案。给定的数值结果突出表明,所检查的结构表现出弯曲主导的响应,并且能够获得较低的有效剪切模量值,以及同时较高的有效压缩模量值。我们得出的结论是,有限五模晶格可以被认为是非常适合于地震隔离和冲击保护目的的新型超材料。可以通过考虑几个几何和机械设计变量来微调它们的弹性响应。 (C)2016 Elsevier Ltd.保留所有权利。

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