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Experimental Mechanics

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01-02-2013

Nano-Indentation Device for Investigating the Mechanics of Compliant Materials

Authors: D.W. Evans, N.A. Vavalle, R. DeVita, P. Rajagopalan, J.L. Sparks

Published in: Experimental Mechanics | Issue 2/2013

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Abstract

Indentation testing has long been used to measure the mechanical properties of a wide range of materials from metals and ceramics to brain tissue and hydrogels. The purpose of this study was to build and validate a Nano-Tissue Indenter (NTI) capable of performing indentation testing on micro-scale structures within the liver’s extracellular matrix. Two silicone-based tissue simulant materials were selected with elastic properties similar to hydrogels used for liver cell cultures. Samples of each material formulation, EcoFlex0030 (EF30) and EcoFlex0010 (EF10), were indented with NTI and also tested in unconfined compression to provide benchmark shear moduli. The resulting force and displacement measurements from NTI with resolutions of 300 nN and 700 nm respectively were analyzed using the Pietrement-Troyon model of adhesive contact. Using this method, NTI was able to distinguish a 10 kPa difference in shear modulus between EF30 and EF10 with comparable significance as unconfined compression (p < 0.001). General agreement between the results of the two test methods is evidenced by the overlapping of the mean ± S.D. range for the NTI-indentation and benchmark unconfined compression shear moduli measured for both formulations. NTI was used successfully to perform nano-indentation tests on samples of compliant material undergoing adhesive contact, similar to the extracellular matrix of organs such as the liver.

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Title: Nano-Indentation Device for Investigating the Mechanics of Compliant Materials
Authors: D.W. Evans
N.A. Vavalle
R. DeVita
P. Rajagopalan
J.L. Sparks
Publication date: 01-02-2013
Publisher: Springer US
Published in: Experimental Mechanics / Issue 2/2013
Print ISSN: 0014-4851
Electronic ISSN: 1741-2765
DOI: https://doi.org/10.1007/s11340-012-9618-0

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