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Gelatin Equation of State Characterization Progress

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US Army Research Laboratory Aberdeen Proving Ground United States

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In this report the Brillouin scattering data have been reviewed and divided into two domains a in the low pressure phase, for the pressure below 2 GPa, the specific heat ratio gamma is assumed to be 1.5 b in the higher pressure phase, for pressure higher than 2 GPa, the specific heat ratio gamma is assumed to be 1.0, which is valid for incompressible material, because at higher pressure, the material has transitioned into a glassy state. The calculated pressure, density data are fitted with the Vinet and the Birch-Murnaghan equations of state to find the isothermal bulk moduli and its pressure derivatives. The results compare more favorably with Hugoniot test data. More accurate measurements for the densities, the specific heats, the thermal expansion coefficient, and the sound velocities in the low pressure domain will improve the data post-processing. Lab tests in the high pressure domain above 2 GPa are not easy to perform. But the low pressure domain will cover the majority of application needs.

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Technical Report,01 Oct 2008,01 Aug 2009



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