Macroscopic Modelling of Foams

An Order-Parameter Approach vs. a Micropolar Model

Abstract

The size-dependent mechanical properties of foam materials cannot be described by a classical continuum approach. Using extended continuum models such as the micropolar approach is one of the possibilities to model such mechanical behaviour. The presented order-parameter approach provides a way to describe size effects by means of an additional field variable which is not of kinematical nature as it is usually the case in the micropolar model. In the present contribution the micropolar approach is compared with the order-parameter approach in order to model the size-dependent behaviour. The investigated order-parameter model shows advantages over the micropolar approach, as it enables to cover both types of size effects: the stiffening as well as the weakening.