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Publication Citation: Modeling and DIC Measurements of Dynamic Compression Tests of a Soft Tissue Simulant

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Author(s): Steven P. Mates; Aaron M. Forster; R Rhorer; Amit Bagchi; Richard Everett; Kirth Simmonds;
Title: Modeling and DIC Measurements of Dynamic Compression Tests of a Soft Tissue Simulant
Published: June 06, 2011
Abstract: Stereoscopic digital image correlation (DIC) is used to measure the shape evolution of a soft, transparent thermoplastic material subject to a high strain rate compression test performed using a Kolsky bar. Rather than using the usual Kolsky bar wave analysis methods to determine the specimen response, however, the response is instead determined by an inverse method. The test modeled using finite elements, and the gel stiffness giving the best match with the shape and force history data is identified by performing iterative simulations. The advantage of this approach is that specimen equilibrium is not required, and friction effects, which are difficult to eliminate experimentally, can be accounted for. The thermoplastic is modeled as a hyperelastic material, and the identified dynamic compressive (non-linear) stiffness is compared its quasi-static compressive (non-linear) stiffness to determine its rate sensitivity.
Conference: SEM 2011 Annual Meeting
Proceedings: Proceedings of the SEM 2011 Annual Meeting
Location: Uncasville, CT
Dates: June 13-16, 2011
Keywords: blast protection; Kolsky bar; digital image correlation; tissue simulant material; inverse method
Research Areas: Materials performance
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