PLASTIC BEHAVIOR OF FIBROUS LAMINAE

A model of the plastic behaviour of polymer-based unidirectional compo site materials during quasi-static tensile tests is presented. Cases o f both monotonic and non-monotonic loading are considered. The mechani cal properties of the unidirectional lamina are supposed to depend on kinematic parameters, namely the actual shear strain and the extremum shear strains attained during the loading history. Apart from the usua l elastic moduli, this model depends on two parameters in the monotoni c case, plus two parameters to describe the unloading/reloading loops, and one variable, the maximum shear strain. This model is easy to inc lude in FEM codes, in incremental non-linear analyses.