| Autor: |
Ye, S. J., Chai, H. W., Xiao, X. H., Cai, Y., Yao, X. H., Luo, S. N. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 8/28/2019, Vol. 126 Issue 8, pN.PAG-N.PAG, 9p, 1 Diagram, 2 Charts, 7 Graphs |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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