On the extended use of Backus average

Backus (1962) developed his technique for homogenization of a layered structure solely within the context of linear elastic theory. In this paper we propose an extended use of Backus average for finitely deformed materials of a layered structure. We attempt to use two different approaches to account for large deformations. The first approach utilizes the connections between linear and nonlinear transverse elasticity. For the second approach we use a formulation based on prestress in the material. We conclude that the first approach, although with some limitations, can be used successfully.