Caponi, MaicolSapio, Francesco2019-04-302019-04-302019-04-30https://openscience.sissa.it/handle/1963/35334In this paper we prove the existence of solutions for a class of viscoelastic dynamic systems on time-dependent cracked domains, with possibly degenerate viscosity coefficients. Under stronger regularity assumptions we also show a uniqueness result. Finally, we exhibit an example where the energy-dissipation balance is not satisfied, showing there is an additional dissipation due to the crack growth.enlinear second order hyperbolic systemsfracture mechanicsviscoelasticityelastodynamicscracking domains