On the Use of Mechanical Metamaterials for Innovative Seismic Isolations Systems

Fraternali, Fernando; Carpentieri, Gerardo; Montuori, Rosario; Amendola, Ada; Benzoni, Gianmario

doi:10.7712/120115.3401.636

Cited by 26 publications

(20 citation statements)

References 25 publications

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“…The present study aims at extending the research initiated in Refs. [4] [9], through a numerical investigation on the elastic response of single-and multi-layered confined pentamode lattices featuring different aspect ratios and lamination schemes. We examine a wide range of values of selected design variables, which are related to the size of the nodal junctions (microstructure aspect ratio), the ratio between the number of unit cells placed in the vertical and horizontal directions in each layer (macrostructure aspect ratio), and the number of layers.…”

Section: Introductionmentioning

confidence: 99%

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

Amendola

Carpentieri

Feo

2016

Composite Structures

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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.

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Section: Introductionmentioning

confidence: 99%

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

Amendola

Carpentieri

Feo

2016

Composite Structures

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“…The impactabsorbing liner of next-generation helmets could be designed to reproduce the skull-brain system, with the outer section mimicking the skull, through a pressure-wave mitigation lattice [32], and the inner section mimicking the cerebrospinal fluid, via micro-or small-scale confined pentamode metamaterials acting as "metafluid" lattices [11]. Macroscale sfcc systems with pinned or semi-rigid joints can also serve as next-generation seismic isolators, whose isolation properties may be finely adjusted to the structure being isolated [12]- [13]. Previous studies have pointed out several mechanical analogies between the bending-dominated response of confined pentamode lattices and the mechanics of seismic isolation devices alternating rubber layers and stiffening plates [20]- [23].…”

Section: Discussionmentioning

confidence: 99%

“…The incremental displacements and elongations of the elementary module are related to each other through the following incremental kinematic problem 11 11 ,  (12) Due to the assumption of rigid behavior of the terminal pates, and without loss of generality, we hereafter assume that the bottom plate is at rest, and the motion of the top plate can be represented as the composition of an incremental translation ̇ and an infinitesimal incremental rotation with axial vector ̇, about its center of mass . Under such assumptions, ̇2 =̇2(̇,̇) in Eqn.…”

Section: Incremental Kinematic Problemmentioning

confidence: 99%

Mechanical modeling of innovative metamaterials alternating pentamode lattices and confinement plates

Fraternali

2017

Journal of the Mechanics and Physics of Solids

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This study examines the mechanical behavior of a novel class of mechanical metamaterials\ud alternating pentamode lattices and stiffening plates. The unit cell of such lattices consists of a\ud sub-lattice of the face cubic-centered unit cell typically analyzed in the current literature on\ud pentamode materials. The studied systems exhibit only three soft deformation modes in the\ud infinitesimal stretch-dominated regime, as opposed to the five zero-energy modes of unconfined\ud pentamode lattices. We develop analytical formulae for the vertical and bending stiffness\ud properties and study the dependence of such quantities on the main design parameters: the\ud lattice constant, the solid volume fraction, the cross-section area of the rods, and the layer\ud thickness. A noteworthy result is that the effective compression modulus of the analyzed\ud structures is equal to two thirds of the Young modulus of the stiffest isotropic elastic networks\ud currently available in the literature, being accompanied by zero-rigidity against infinitesimal\ud shear and twisting mechanisms. The use of the proposed metamaterials as novel seismicisolation\ud devices and impact-protection equipment is discussed by drawing comparisons with\ud the response of alternative devices already available or under development

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“…Such nonlinear metamaterials will be able to transform compressive disturbances into solitary rarefaction waves with progressively vanishing oscillatory tail, and/or rarefaction shock-like waves [4]. Finally, we address to future studies the employment of tensegrity concepts in a variety of mechanical problems involving innvovative materials and structures [61]- [65].…”

Section: Discussionmentioning

confidence: 99%

Accurate Numerical Methods for Studying the Nonlinear Wave-Dynamics of Tensegrity Metamaterials

Fabbrocino¹,

Carpentieri²,

Amendola³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. This paper presents presents an effective numerical approach to the nonlinear dynamics of columns of tensegrity prisms subject to impulsive compressive loading. The equations of motions of the analyzed structures are formulated in vector form, by modeling the cables as deformable members and the bars as rigid bodies. The given numerical results investigate the wave dynamics of tensegrity columns, with focus on the propagation of compression solitary waves with variable size and amplitude throughout the system, as a function of the applied impact velocity and the state of prestress of the structure. The engineering potential of the examined structures as tunable acoustic actuators is discussed.

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On the Use of Mechanical Metamaterials for Innovative Seismic Isolations Systems

Abstract: Abstract. We design novel versions of pentamode materials

Cited by 26 publications

References 25 publications

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

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

Mechanical modeling of innovative metamaterials alternating pentamode lattices and confinement plates

Accurate Numerical Methods for Studying the Nonlinear Wave-Dynamics of Tensegrity Metamaterials

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