Non-Newtonian Behavior of Ballistic Gelatin at High Shear Rates |
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Authors: | G Subhash J Kwon R Mei D F Moore |
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Institution: | (1) Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA;(2) LS Cable & System Ltd., Energy System Research Center, Hogye-dong, Dongan-gu, Anyang-si, Gyeonggi-do, Republic of Korea;(3) Department of Neurology, Tulane University School of Medicine, New Orleans, LA 70112, USA |
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Abstract: | A coordinated modeling and experimental effort to investigate the shear stress-shear strain rate response of ballistic gelatin
is presented. A power-law constitutive model that captures non-Newtonian shear-thickening behavior, the evolution of viscosity,
and the momentum diffusion at high shear rates is adopted. A simple asymptotic relationship between the maximum wall shear
stress and the maximum striking wall velocity is derived in the high diffusion rate regime for a shear flow between two parallel
plates. Experimental investigation is conducted on double lap-shear test fixture with gelatin specimens of different thicknesses
subjected to high strain rate input on the inner surface, generated by a polymer split Hopkinson pressure bar. This test fixture
allows measurement of transmitted shear stress as well as visualization of momentum diffusion through gelatin when imaged
by a high speed camera. Gelatin specimens of various thicknesses were used for extracting the power-law model parameters.
It is found that ballistic gelatin behaves as a shear-thickening fluid at high shear rates with a power-law exponent of 2.22. |
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