期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 99, 期 -, 页码 259-271出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2016.11.010
关键词
Pentamode lattices; Layered systems; Stretch-dominated lattices; Effective elastic moduli; Seismic isolation; Impact protection
资金
- Ph.D. School in Civil Engineering at the University of Salerno
This study examines the mechanical behavior of a novel class of mechanical metamaterials alternating pentamode lattices and stiffening plates. The unit cell of such lattices consists of a sub-lattice of the face cubic-centered unit cell typically analyzed in the current literature on pentamode materials. The studied systems exhibit only three soft deformation modes in the infinitesimal stretch-dominated regime, as opposed to the five zero-energy modes of unconfined pentamode lattices. We develop analytical formulae for the vertical and bending stiffness properties and study the dependence of such quantities on the main design parameters: the lattice constant, the solid volume fraction, the cross-section area of the rods, and the layer thickness. A noteworthy result is that the effective compression modulus of the analyzed structures is equal to two thirds of the Young modulus of the stiffest isotropic elastic networks currently available in the literature, being accompanied by zero-rigidity against infinitesimal shear and twisting mechanisms. The use of the proposed metamaterials as novel seismic isolation devices and impact-protection equipment is discussed by drawing comparisons with the response of alternative devices already available or under development.
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