Material Internal Frictional Dissipation Modelling

This presentation is concerned with a first introductory study devoted to internal frictional dissipation modelling of cracked materials. The problem is set as periodic Representative Volume Element (RVE) with oriented cracks diffused in the bulk material. As first stage, useful for moderate loading levels, cracks are considered fixed and stable at certain position and are modelled as perfect frictional mechanical interface with unilateral contact features. Analyses on cyclic material response are discussed for 2D problems. A second type of analyses is performed considering a further cohesion strength and a crack propagation criteria, which are typical of interface damage mechanical approaches. In this more complex context, dissipation is related to both energy release rate for crack propagation and frictional deformation mechanisms. Finally, some considerations on synthesis and computational approaches to the overall behaviour for structural analysis are discussed, in the spirit of finite element multiscale approach