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

  • Steven P. Mates
  • Richard Rhorer
  • Aaron Forster
  • Richard K. Everett
  • Kirth E. Simmonds
  • Amit Bagchi
Conference paper
First Online:
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

Stereoscopic digital image correlation (DIC) is used to measure the shape evolution of a soft, transparent thermoplastic elastomer 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 is modeled using finite elements, and the elastomer 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 force equilibrium in the specimen 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 to its quasi-static compressive (non-linear) stiffness to determine rate sensitivity.

Keywords

Digital Image Correlation Maraging Steel Flyer Plate Digital Image Correlation Measurement Dynamic Compression Test 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© The Society for Experimental Mechanics, Inc. 2011

Authors and Affiliations

  • Steven P. Mates
    • 1
  • Richard Rhorer
    • 1
  • Aaron Forster
    • 1
  • Richard K. Everett
    • 2
  • Kirth E. Simmonds
    • 2
  • Amit Bagchi
    • 2
  1. 1.National Institute of Standards and TechnologyGaithersburgUSA
  2. 2.Naval Research LaboratoryWashingtonUSA

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