Asymptotic analysis of deformation behavior in high-contrast fiber-reinforced materials: Rigidity and anisotropy

Abstract

We identify the restricted class of attainable effective deformations in a model of reinforced composites with parallel, long, and fully rigid fibers embedded in an elastic body. In mathematical terms, we characterize the weak limits of sequences of Sobolev maps whose gradients on the fibers lie in the set of rotations. These limits are determined by an anisotropic constraint in the sense that they locally preserve length in the fiber direction. Our proof of the necessity emerges as a natural generalization and modification of the recently established asymptotic rigidity analysis for composites with layered reinforcements. However, the construction of approximating sequences is more delicate here due to the higher flexibility and connectedness of the soft material component. We overcome these technical challenges by a careful approximation of the identity that is constant on the rigid components, combined with a lifting in fiber bundles for Sobolev functions. The results are illustrated with several examples of attainable effective deformations. If an additional second-order regularization is introduced into the material model, only rigid body motions can occur macroscopically.

On static and evolutionary homogenization in crystal plasticity for stratified composites

“…In [11], these techniques have been carried forward to a model for plastic composites without linear hardening in the spirit of [9], which leads to a variational limit problem on the space of functions of bounded variation. Natural generalizations of these models to three (and higher) dimensions, where the material heterogeneities are either layers or fibers are studied [6] and [15], respectively. Note that these two references, which are formulated in context of nonlinear elasticity, use energy densities with p-growth for 1 < p < +∞, Ω ⊂ R 2 ε Figure 1.…”