Spall studies of differently treated 2024A1 specimens

Abstract

Commercial manganin stress gauges are used in planar impact experiments to determine spall strengths of variously heat-treated 2024A1 specimens. A one-dimensional Lagrangian code is used to find the best fit of calculated versus experimental stress histories by varying the spall strength in the code and using a simple threshold criterion. We found values in the range of 1.2–1.75 GPa for spall strengths of the differently treated specimens. These values are in good agreement with published data obtained by other methods. We also confirmed the spall strength values by a series of low-stress experiments resulting in only incipient spalls. A specimen of 2024T351 which was shocked perpendicular to the rolling direction has a lower spall strength (by about 0.3 GPa) than a specimen shocked along the rolling direction. This difference is very close to that predicted earlier.