Derivation of temperature dependent mechanical properties of polymer foam core materials using optical extensometry
School of Engineering Sciences, University of Southampton,
2 French Institute for Advanced Mechanics (IFMA), Campus de Clermont-Ferrand / les Cezeaux, BP 265, 63175 AUBIERE Cedex, France
3 Department of Mechanical and Manufacturing Engineering, Aalborg University, Pontoppidanstræde 101, DK-9220 Aalborg East, Denmark
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A methodology for determining the temperature dependence of Young’s modulus and Poisson’s ratio of polymer foams core materials is presented. The design of the test specimen is described in detail, covering the parasitic effects resulting from departures from the uniform strain condition. The measurement approach is based on a non-contact technique so that the behaviour of the complaint foam is not modified by the attachment of strain gauges or extensometers. Firstly experiments are conducted at room temperature and then at elevated temperatures in a thermal chamber. Readings are taken through an optical window using a standard digital camera. Digital image correlation is used to obtain the strains.
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