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Low-stress shock and release wave behavior of porous carbon

Journal of Applied Physics, ISSN: 0021-8979, Vol: 41, Issue: 1, Page: 351-360
1970
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  • Citations
    11
    • Citation Indexes
      11

Article Description

Shock-reverberation techniques and transmitted-wave experiments were used to determine multiple shock states and release adiabats from shock-induced states for a 0.68-g/cm graphite foam and a 1.37 g/cm carbon felt. These experiments indicated that the samples were not compacted to solid density in the 1-3 μsec duration of the stress pulse, even though the peak pressures were well in excess of the quasistatic yield strength of the materials. For the very low-density graphite foam, release adiabats centered at initial shock states between 0.7 and 3.2 kbar were found to be indistinguishable from the principal Hugoniot; whereas for the more dense material, release adiabats centered between 0 and 25 kbar were substantially different from the principal Hugoniot. This seemingly anomalous behavior of the graphite foam is likely due to a separation of the solid portions of the sample from the gauge. A prediction of the distance at which a short stress pulse is overtaken by trailing relief waves is given for the carbon felt. © 1970 The American Institute of Physics.

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