The present work illustrates results concerned with experimental tests on physical (reduced-scale) models of pentamode lattices confined between rigid plates and equipped with rigid connections. Finally, it discusses the potential use of such systems for the base isolation of existing buildings. Through experimental arguments, we show that the mechanical response of pentamode lattices with rigid connections is bending-dominated, and that such structures are able to carry unidirectional compressive loads with sufficiently high stiffness, while showing markedly low stiffness against shear loads. The high ratio between effective compression and shear rigidities derives both from the nonzero bending rigidity of nodes and rods, and from the confinement effect played by the stiffening plates. The obtained results emphasize the ability of such structures to behave as tension-capable and performance-based systems, whose mechanical properties are driven more by the geometry of the lattice microstructure (i.e., such systems behave as mechanical metamaterials) than the chemical composition of the material they are made of.

On the mechanics of pentamode lattices

Amendola A.;Fraternali F.
2017-01-01

Abstract

The present work illustrates results concerned with experimental tests on physical (reduced-scale) models of pentamode lattices confined between rigid plates and equipped with rigid connections. Finally, it discusses the potential use of such systems for the base isolation of existing buildings. Through experimental arguments, we show that the mechanical response of pentamode lattices with rigid connections is bending-dominated, and that such structures are able to carry unidirectional compressive loads with sufficiently high stiffness, while showing markedly low stiffness against shear loads. The high ratio between effective compression and shear rigidities derives both from the nonzero bending rigidity of nodes and rods, and from the confinement effect played by the stiffening plates. The obtained results emphasize the ability of such structures to behave as tension-capable and performance-based systems, whose mechanical properties are driven more by the geometry of the lattice microstructure (i.e., such systems behave as mechanical metamaterials) than the chemical composition of the material they are made of.
2017
978-889-42484-7-0
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4701926
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