Discussion on the physical meaning of free surface velocity curve in ductile spallation

Abstract

The physical meaning of ductile spall fracture corresponding to the typical properties in free surface velocity curve has been discussed. A correlation between the macroscopic responses and the evolution of mic-damage is established; the pullback signal the found to correspond to the condition for nucleation of voids, and the rate at which the velocity rises to the first peak beyond the minima corresponds to the rate of damage evolution, and by using the velocity period after the the pullback signal we can distinguish the state of damage.