Zhang, Q., Lu, W., Scarpa, F. et al. (5 more authors) (2021) Topological characteristics and mechanical properties of uniaxially thermoformed auxetic foam. Materials and Design, 211. 110129. ISSN 0264-1275
Abstract
We present here a simplified procedure to manufacture auxetic PU foam via a single direction thermoforming compression process applied to conventional (pristine) open cell foam samples. The auxetic foams produced here have a Poisson's ratio ν21 ranging from −1 to 0 in the 1–2 plane and a tangent modulus Et2 ranging from 0.2 MPa to 2 MPa. X-ray μ-CT and 3D skeletonization enabled the extraction of the topological parameters of the pristine and the auxetic foams. The auxetic foam is transverse isotropic with cell structures exhibiting a re-entrant shape along the thermoforming compression direction 1. More ribs are also oriented within the transverse plane 2–3, in which the stiffness is larger. Tensile and compression quasi-static tests have been carried out on samples cut along different directions and having various thermoforming compression ratios rc. Auxeticity is present in the in 1–2 plane only for compression ratios between 40% and 80%. Finite Element models for the pristine and auxetic foams have also been built from the μ-CT scanned 3D models. The numerical results show a good agreement with the experimental data and help explaining the deformation mechanisms of these auxetic foams.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | Auxetic foam; Negative Poisson’s ratio; Modulus; Loss factor; X-ray CT; Finite element method |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Automatic Control and Systems Engineering (Sheffield) |
Funding Information: | Funder Grant number Engineering and Physical Sciences Research Council EP/H00453X/1; EP/R032793/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 22 Oct 2021 06:47 |
Last Modified: | 22 Oct 2021 06:47 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.matdes.2021.110139 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:179509 |