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

Published

June 6, 2011

Author(s)

Steven P. Mates, Aaron M. Forster, R Rhorer, Amit Bagchi, Richard Everett, Kirth Simmonds

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.

Proceedings Title

Proceedings of the SEM 2011 Annual Meeting

Conference Dates

June 13-16, 2011

Conference Location

Uncasville, CT

Conference Title

SEM 2011 Annual Meeting

Pub Type

Conferences

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Keywords

blast protection, Kolsky bar, digital image correlation, tissue simulant material, inverse method

Citation

Mates, S. , Forster, A. , Rhorer, R. , Bagchi, A. , Everett, R. and Simmonds, K. (2011), Modeling and DIC Measurements of Dynamic Compression Tests of a Soft Tissue Simulant, Proceedings of the SEM 2011 Annual Meeting, Uncasville, CT, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=908087 (Accessed April 23, 2024)