Numerical Calculations of Hypervelocity Impact Crater Formation in Hard and Soft Aluminum Alloys

摘要

The wave propagation and crater growth characteristics in hypervelocity impact events on 1100-0 and 7075-T6 aluminum alloys are analyzed using a two-dimensional Eulerian numerical code called STEEP. The material model used in the calculations includes work hardening and thermal softening effects. Impacts of .635 cm aluminum spheres into semi-infinite targets at 7 km/sec and 4 km/sec are treated. Analytical predictions which can be compared directly with experimental results include crater growth characteristics and peak stress wave propagation and decay characteristics. Also included in the report are velocity field plots and principal stress field plots at selected times. The velocity magnitude, pressure, and normal stress are also plotted versus time at selected target locations. The numerical calculations show that material strength is important in determining the crater growth characteristics and final crater dimensions for the cases treated. (Author)