Spallation of polycarbonate under plate impact loading

摘要: We investigate spallation of polycarbonate under plate impact loading. The Hugoniot equation state up to ∼ 1.3 GPa (corresponding a peak particle velocity 380 m / s) is obtained, and spall strength corresponding strain rates are determined at shock stresses 2.4 600 s). With increasing strength, the transition from strain-hardening softening states occurs as result heating; remains approximately constant, followed by rapid drop upon softening. Release/tensile melting higher velocities. Three-dimensional void configurations postmortem samples obtained via X-ray computerized tomography. small voids flat curved for low-speed shots but become ellipsoidal high-speed shots, their coalescence leads different shapes likely due damage mechanisms.We mechanisms.