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Viscoelastic and poroelastic mechanical characterization of hydrated gels

Published online by Cambridge University Press:  31 January 2011

Matteo Galli ,
Kerstyn S.C. Comley ,
Tamaryn A.V. Shean  and
Michelle L. Oyen
Matteo Galli
Affiliation:
Engineering Department, Cambridge University, Cambridge CB2 1PZ, United Kingdom
Kerstyn S.C. Comley
Affiliation:
Engineering Department, Cambridge University, Cambridge CB2 1PZ, United Kingdom
Tamaryn A.V. Shean
Affiliation:
Engineering Department, Cambridge University, Cambridge CB2 1PZ, United Kingdom
Michelle L. Oyen*
Affiliation:
Engineering Department, Cambridge University, Cambridge CB2 1PZ, United Kingdom
*
a) Address all correspondence to this author. e-mail: mlo29@cam.ac.uk
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Abstract

Measurement of the mechanical behavior of hydrated gels is challenging due to a relatively small elastic modulus and dominant time-dependence compared with traditional engineering materials. Here polyacrylamide gel materials are examined using different techniques (indentation, unconfined compression, dynamic mechanical analysis) at different length-scales and considering both viscoelastic and poroelastic mechanical frameworks. Elastic modulus values were similar for nanoindentation and microindentation, but both indentation techniques overestimated elastic modulus values compared to homogeneous loading techniques. Hydraulic and intrinsic permeability values from microindentation tests, deconvoluted using a poroelastic finite element model, were consistent with literature values for gels of the same composition. Although elastic modulus values were comparable for viscoelastic and poroelastic analyses, time-dependent behavior was length-scale dependent, supporting the use of a poroelastic, instead of a viscoelastic, framework for future studies of gel mechanical behavior under indentation.

Keywords

Elastic propertiesNanoindentationWater
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 973 - 979
Copyright
Copyright © Materials Research Society 2009

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