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A numerical study on the elastic response of single- and multi-layer systemsformed by alternating pentamode lattices and stiffening plates is presented.Finite element simulations are conducted to analyze the dependence of theeffective elastic moduli of such structures upon suitable aspect ratios, whichcharacterize the geometry of the generic pentamode layer at the micro- andmacro-scale, and the lamination scheme of the layered structure. The givennumerical results highlight that the examined structures exhibitbending-dominated response, and are able to achieve low values of the effectiveshear modulus and, contemporarily, high values of the effective compressionmodulus. We are lead to conclude that confined pentamode lattices can beregarded as novel metamaterials that are well suited for seismic isolation andimpact protection purposes. Their elastic response can be finely tuned byplaying with several geometrical and mechanical design variables.

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