Micromorphic Homogenisation of a Porous Medium: Application to Size Effects and Quasi-Brittle Damage

The classical theory of continuum mechanics requires that distances over which gradients occur are much larger than the length scales of the microstructure. This requirement is violated if deformation localizes due to material softening which is why the predictions of classical damage models feature certain unrealistic aspects. In the present contribution, a micromorphic model for quasi-brittle damage, derived through homogenisation, is employed in FEM simulations to overcome this problem. (© 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)