Journal
POLYMER TESTING
Volume 27, Issue 8, Pages 995-1004Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2008.09.001
Keywords
Rubber-like materials; Hyperelasticity; Bulge test; Optical methods
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Rubber-like materials exhibit a particular stress-strain behaviour known as hyperelasticity. Several models are available in the literature for these materials, based on the definition of a particular expression of the specific potential deformation energy. Among these, Mooney-Rivlin and Ogden models are the most used. In both cases, at least uniaxial and biaxial stretching tests are required to fit the model and extract material parameters. In this work, an experimental rig was set up to carry out equi-biaxial tests: the classic bulge test method has been coupled with optical devices allowing measurement in real time of the stress and elongation levels of the specimen. Uniaxial stretching tests were performed by means of a standard tensile machine and a video extensometer. Quasi-static experimental results were used to calibrate hyperelastic models. Finally, a planar tension test was carried out to validate the material models fitted from uniaxial and equi-biaxial data. FEM simulations of the test procedures give a useful comparison between numerical and experimental data. (C) 2008 Elsevier Ltd. All rights reserved.
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