Computational analysis of sandwich-structured composites with an auxetic phase

Abstract

A sandwich-structured composite is a special class of composite materials that is fabricated by attaching two thin but stiff layers to a lightweight but thick core. Composites analyzed in this paper consist of two different materials: auxetic and structural steel. The optimization criterion is minimum compliance for the load case where the frame's top boundary is downward loaded. Outer layers are made of steel while the middle layer is twophase solid material composite. Only the middle layer is optimized by means of minimization of the objective function defined as the internal strain energy. In the first part of this paper we study the application of the solid isotropic material with penalization (SIMP) model to find the optimal distribution of a given amount of materials in sandwich-structured composite. In the second part we propose a multilayered composite structure in which internal layers surfaces are wavy. In both cases the total energy strain is analyzed.

Dynamic response of sandwich panels with auxetic cores

“…Composites with auxetic phase were studied in Refs. . We should add here that similar studies, but with different shapes of inclusions (elliptic and star‐like) were discussed earlier by Wojciechowski .…”

Finite Element Analysis of the Influence of the Covering Auxetic Layer of Plate on the Contact Pressure

“…Milton however, has shown that isotropic materials with negative Poisson's ratio can exist within the framework of continuum elasticity. Recently, a two‐phased auxetic composite having no voids and built of two typical “positive” materials have been presented by Strek . Naturally, auxetic materials can also be used as a constituent in composite structures and so influence strongly the behavior of resultant composite.…”

Behavior of laminated shell composite with imperfect contact between the layers

“…On the other hand, the multilayered curvilinear shell structures have received special attention in the last years. In [10][11][12][13] several mathematical methods have been used to derive analytical expression for the elastic properties of laminated shell composites. As a particular case, in [14], the expression of the effective coefficients for a curvilinear shell composite with perfect contact at the interface is obtained.…”