A COMPARISON OF PHASE-CHANGE PHENOMENA IN CTH WITH EXPERIMENTAL-DATA

An estimate of the current state of the predictive capabilities of hyd rocodes for impacts where phase changes may be important was made by s imulating a series of experiments where zinc spheres impact thin zinc plates at 4 velocities. The experimental data was taken from Mullin, e t al. [1] and consisted of radiographs of the debris cloud and estimat es of the momentum in the debris cloud along the velocity vector. The velocities ranged from 3.30 to 6.79 km/s indicating that the debris co nsists of solid/molten fragments to predominately vapor phase material as the velocity increases. The simulations reveal that the CTH hydro can accurately predict the debris structure and momentum transfer for this class of impacts.