Abstract
Spall (dynamic fracture) strength of A12024-T4 and SS304 alloy have been determined at high strain rate. Gas gun experiments have been conducted on A12024-T4 and SS304 target plates in symmetric impact configuration. The spall in A12024-T4 and SS304 plates has been achieved by impacting them with parallel flying plates accelerated to velocities of 0.56 km/s and 0.6 km/s, respectively. The plate impacts in the two experiments introduced a shock wave of 4.38 GPa and 11.9 GPa, respectively in A12024 and SS304 target plates. In each experiment the interaction of tensile waves resulting from the reflection of shock wave from the target free surface and from the flyer free surface generated large tensile stress in the target which exceeded the spall strength causing spall fracture. The analysis of the velocity history of the target free surface recorded using VISAR reveals the dynamic yield strength of A12024-T4 to be 0.355 and spall strength of 1.46 GPa at strain rate of ~ 104 /s. These quantities in SS304 were determined to be 0.8 GPa and 2.69 GPa with strain rate of ~ 104 /s.
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