Numerical Study of Spall in an Aluminum Alloy under Planar Impact Loading

S. Hanim , J. Klepaczko

Numerical analysis has been performed by implementation of a cumulative dynamic fracture criterion [1] which depends on the free energy of activation of separation, temperature and the load history. First series of calculation has been performed for elastic case to obtain minimum critical spall-fracture stress as a function of critical time of loading. Next, a viscoplastic constitutive relation which includes the effects of strain hardening, strain rate and temperature, along with cumulative criterion and heat conduction, because of temperature increase due to volume dilatation and dissipation of plastic work, has been implemented in FE code. Also, free surface velocity-time profiles have been calculated for a number of impact velocities, showing creation of new free surfaces inside the target plate. The influence of physical parameters is discussed on the basis of numerical results.

Domaines: Articles anciens

S. Hanim, J. Klepaczko. Numerical Study of Spall in an Aluminum Alloy under Planar Impact Loading. Journal de Physique IV Proceedings, 1997, 07 (C3), pp.C3-791-C3-796. ⟨10.1051/jp4:19973134⟩. ⟨jpa-00255421⟩