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auxetic materials

Optimal Elastostatic Cloaks

Submitted by arash_yavari on
research
Elastic cloaking
optimal design
mixed finite elements
adjoint state method
auxetic materials

An elastic cloak hides a hole (or an inhomogeneity) from elastic fields. In this paper, a formulation of the optimal design of elastic cloaks based on the adjoint state method, in which the balance of linear momentum is enforced as a constraint, is presented. The design parameters are the elastic moduli of the cloak, and the objective function is a measure of the distance between the solutions in the physical and in the virtual bodies. Both the elastic medium and the cloak are assumed to be made of isotropic linear elastic materials.

Mechanotropism of single cells adhering to elastic substrates subject to exogenous forces

Submitted by Luca-Deseri on
research
Mechanotropism
cell mechanics
cells rotation
cytoskeleton reconfiguration
auxetic materials

Adherent cells are able to actively generate internal forces, channeled by cytoskeletal protein filaments and transmitted through transmembrane receptors to the surrounding environment by means of focal adhesions.

Hinged-3D metamaterials with giant and strain-independent Poisson’s ratios

Submitted by M. Shaat on
research
mechanical metamaterials
auxetic materials
Negative Poisson's ratio
Giant Poisson's Ratio

Current designs of artificial metamaterials with giant Poisson’s ratios proposed microlattices that secrete the transverse displacement nonlinearly varies with the longitudinal displacement, and the Poisson’s ratio depends on the applied strain (i.e., tailorable Poisson’s ratio). Whereas metamaterials with tailorable Poisson’s ratios would find many important applications, the design of a metamaterial with a giant Poisson’s ratio that is constant over all the material deformation range has been a major challenge.

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