VOID GROWTH AND COMPACTION RELATIONS FOR DUCTILE POROUS MATERIALS UNDER INTENSE DYNAMIC GENERAL LOADING CONDITIONS

Void growth and compaction relations for ductile porous materials unde r intense dynamic general loading conditions are developed. The mathem atical models include the influence of inertial effects, material rate sensitivity, as well as the contribution of surface energy of a void and material work-hardening. Numerical analysis shows that inertia app ears to resist the growth of voids. The inertial effects increase quic kly as the strain rates become higher. The theoretical analysis sugges ts that the inertial effects cannot be neglected at high strain rates. It is also indicated that the dynamic growth of voids is highly sensi tive to the strain rates. The threshold applied external stresses for the void growth and compaction, which are the functions of the distent ion, are derived from void growth and compaction relations.