title: Mechanics of elastic networks.
abstract: We consider a periodic lattice structure ind=2 or 3 dimensions with unit cell comprisingZthin elastic members emanating from a similarly situated central node. A general theoretical approach provides an algebraic formula for the effective elasticity of such frameworks. The method yields the effective cubic elastic constants for three-dimensional space-filling lattices withZ=4, 6, 8, 12 and 14, the last being the 'stiffest' lattice proposed by Gurtner & Durand (Gurtner & Durand 2014Proc. R. Soc. A470, 20130611. (doi:10.1098/rspa.2013.0611)). The analytical expressions provide explicit formulae for the effective properties of pentamode materials, both isotropic and anisotropic, obtained from the general formulation in the stretch-dominated limit forZ=d+1.
authors.affiliation: Department of Mechanical and Aerospace Engineering , Rutgers University , Piscataway, NJ 08854-8058, USA.
authors.forename: Andrew N
authors.initials: AN
authors.lastname: Norris
keywords: elasticity; lattice; pentamode