Spallation of polycarbonate under plate impact loading

We investigate spallation of polycarbonate under plate impact loading. The Hugoniot equation of state up to ∼ 1.3 GPa (corresponding to a peak particle velocity ∼ 380 m / s) is obtained, and spall strength and corresponding strain rates are determined at peak shock stresses up to ∼ 2.4 GPa (correspo...

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Bibliographic Details
Published in:Journal of applied physics 2019-08, Vol.126 (8)
Main Authors: Ye, S. J., Chai, H. W., Xiao, X. H., Cai, Y., Yao, X. H., Luo, S. N.
Format: Article
Language:English
Subjects:
Applied physics
Coalescing
Computed tomography
Equations of state
Hugoniot equation of state
Impact loads
Low speed
Plastic deformation
Shock heating
Softening
Spallation
Strain hardening
Velocity
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Summary:We investigate spallation of polycarbonate under plate impact loading. The Hugoniot equation of state up to ∼ 1.3 GPa (corresponding to a peak particle velocity ∼ 380 m / s) is obtained, and spall strength and corresponding strain rates are determined at peak shock stresses up to ∼ 2.4 GPa (corresponding to a peak particle velocity ∼ 600 m / s). With increasing shock strength, the transition from strain-hardening to softening at shock states occurs as a result of shock heating; spall strength remains approximately constant, followed by a rapid drop upon strain softening. Release/tensile melting occurs at higher impact velocities. Three-dimensional void configurations of the postmortem samples are obtained via X-ray computerized tomography. The small voids are flat and curved for low-speed shots but become ellipsoidal for high-speed shots, and their coalescence leads to different shapes likely due to different damage mechanisms.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5108965