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Multiscale mechanical characterization of biomimetic physically associating gels

Published online by Cambridge University Press:  01 August 2006

Thomas F. Juliano ,
Aaron M. Forster ,
Peter L. Drzal ,
Tusit Weerasooriya ,
Paul Moy  and
Mark R. VanLandingham
Thomas F. Juliano
Affiliation:
U.S. Army Research Laboratory, Weapons & Materials Research Directorate, Aberdeen Proving Ground, Maryland, 21005
Aaron M. Forster
Affiliation:
U.S. Army Research Laboratory, Weapons & Materials Research Directorate, Aberdeen Proving Ground, Maryland, 21005
Peter L. Drzal
Affiliation:
PPG Industries, Inc., Allison Park, PA 15101
Tusit Weerasooriya
Affiliation:
U.S. Army Research Laboratory, Weapons & Materials Research Directorate, Aberdeen Proving Ground, Maryland, 21005
Paul Moy
Affiliation:
U.S. Army Research Laboratory, Weapons & Materials Research Directorate, Aberdeen Proving Ground, Maryland, 21005
Mark R. VanLandingham*
Affiliation:
U.S. Army Research Laboratory, Weapons & Materials Research Directorate, Aberdeen Proving Ground, Maryland, 21005
*
b)Address all correspondence to this author. e-mail: mvanlandingham@arl.army.mil
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Abstract

The mechanical response of living tissue is important to understanding the injury-risk associated with impact events. Often, ballistic gelatin or synthetic materials are developed to serve as tissue surrogates in mechanical testing. Unfortunately, current materials are not optimal and present several experimental challenges. Bulk measurement techniques, such as compression and shear testing geometries, do not fully represent the stress states and rate of loading experienced in an actual impact event. Indentation testing induces deviatoric stress states as well as strain rates not typically available to bulk measurement equipment. In this work, a ballistic gelatin and two styrene-isoprene triblock copolymer gels are tested and compared using both macroscale and microscale measurements. A methodology is presented to conduct instrumented indentation experiments on materials with a modulus far below 1 MPa. The synthetic triblock copolymer gels were much easier to test than the ballistic gelatin. Compared to ballistic gelatin, both copolymer gels were found to have a greater degree of thermal stability. All of the materials exhibit strain-rate dependence, although the magnitude of dependence was a function of the loading rate and testing method.

Keywords

BiomimeticEnergy storagePolymer
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 8 , August 2006 , pp. 2084 - 2092
Copyright
Copyright © Materials Research Society 2006

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