Dynamical properties of a composite microcracked bar based on a generalized continuum formulation

The dynamical behavior of a monodimensional bar with distributed microcracks is addressed in terms of free and forced wave propagation. The multiscale model, derived from a generalized continuum formulation, accounts for the microstructure by means of a micro-displacement variable, added to the standard macro-displacement, and of internal parameters representing density and length of microcracks. The influence of coupling between micro and macro displacement overall response on the system is discussed, as well as the effect of the damage parameters on the propagating waves.The authors acknowledge the financial support of PRIN 2015 "Advanced mechanical modeling of new materials and structures for the solution of 2020 Horizon challenge" (No.2015JW9NJT)