Identification of Poisson's ratios of standard and auxetic low density polymeric foams from full-field measurements
Identification of Poisson's ratios of standard and auxetic low density polymeric foams from full-field measurements
This exploratory paper presents some preliminary results on the use of full-field deformation measurements on low density polymeric foams to identify the evolution of Poisson's ratio with compressive strain. Two types of foams were tested: a standard low density polyurethane foam and an auxetic foam manufactured from a similar precursor. 2D digital image correlation was used to measure the strain field at the specimens surfaces. Then, Poisson's ratios were identified using a dedicated inverse method called the Virtual Fields Method (VFM) and the results compared with the standard approaches. The results illustrate the advantages of the VFM compared to the standard procedure. It was also found that for the standard foam, very strong localization effects resulted in biased Poisson's ratio evaluation. It was shown that this could be corrected by taking into account these localization effects thanks to the full-field information.
low-density polymeric foam, inverse method, digital image correlation, identification, poisson's ratio, auxetic foam
233-253
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
1 May 2010
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Pierron, Fabrice
(2010)
Identification of Poisson's ratios of standard and auxetic low density polymeric foams from full-field measurements.
The Journal of Strain Analysis for Engineering Design, 45 (4), .
(doi:10.1243/03093247JSA613).
Abstract
This exploratory paper presents some preliminary results on the use of full-field deformation measurements on low density polymeric foams to identify the evolution of Poisson's ratio with compressive strain. Two types of foams were tested: a standard low density polyurethane foam and an auxetic foam manufactured from a similar precursor. 2D digital image correlation was used to measure the strain field at the specimens surfaces. Then, Poisson's ratios were identified using a dedicated inverse method called the Virtual Fields Method (VFM) and the results compared with the standard approaches. The results illustrate the advantages of the VFM compared to the standard procedure. It was also found that for the standard foam, very strong localization effects resulted in biased Poisson's ratio evaluation. It was shown that this could be corrected by taking into account these localization effects thanks to the full-field information.
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Published date: 1 May 2010
Keywords:
low-density polymeric foam, inverse method, digital image correlation, identification, poisson's ratio, auxetic foam
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 209657
URI: http://eprints.soton.ac.uk/id/eprint/209657
ISSN: 0309-3247
PURE UUID: 4c40335e-f6ee-470f-8f01-c02181a7d3c5
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Date deposited: 31 Jan 2012 16:55
Last modified: 15 Mar 2024 03:35
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