Mechanical Properties of Ballistic Gelatin at High Deformation Rates |
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Authors: | C P Salisbury D S Cronin |
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Institution: | (1) Department of Mechanical Engineering, University of Waterloo, Waterloo, ON, Canada |
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Abstract: | The characterization of soft or low impedance materials is of increasing importance since these materials are commonly used
in impact and energy absorbing applications. The increasing role of numerical modeling in understanding impact events requires
high-rate material properties, where the mode of loading is predominantly compressive and large deformations may occur at
high rates of deformation. The primary challenge in measuring the mechanical properties of soft materials is balancing the
competing effects of material impedance, specimen size, and rate of loading. The traditional Split Hopkinson Pressure Bar
approach has been enhanced through the implementation of polymeric bars to allow for improved signal to noise ratios and a
longer pulse onset to ensure uniform specimen deformation. The Polymeric Split Hopkinson Pressure Bar approach, including
the required viscoelastic bar analysis, has been validated using independent measurement techniques including bar-end displacement
measurement and high speed video. High deformation rate characterization of 10% and 20% ballistic gelatin, commonly used as
a soft tissue simulant, has been undertaken at nominal strain rates ranging from 1,000 to 4,000/s. The mechanical properties
of both formulations of gelatin exhibited significant strain rate dependency. The results for 20% gelatin are in good agreement
with previously reported values at lower strain rates, and provide important mechanical properties required for this material. |
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