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Topological characteristics and mechanical properties of uniaxially thermoformed auxetic foam

Topological characteristics and mechanical properties of uniaxially thermoformed auxetic foam
Topological characteristics and mechanical properties of uniaxially thermoformed auxetic foam

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 ν 21 ranging from −1 to 0 in the 1–2 plane and a tangent modulus E t2 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 r c. 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.

Auxetic foam, Finite element method, Loss factor, Modulus, Negative Poisson's ratio, X-ray CT
0264-1275
Zhang, Qicheng
269be079-465e-4560-9914-c4b84f512bcb
Lu, Wenjiang
084d54a4-ff34-4c1f-90c5-91558338f6dc
Scarpa, Fabrizio
684472c3-1a28-478a-a388-5fd896986c1d
Barton, David
55e2184f-3bab-43b4-bce3-6a87dc7c3de7
Rankin, Kathryn
d9516566-0ad8-473d-b99b-4683c663a2b7
Zhu, Yunpeng
363c26ba-f671-48f6-a771-26bf881d0d1a
Lang, Zi-Qiang
dec658e4-f38f-43fc-b094-f68c43be3105
Peng, Hua-Xin
4f71af24-3d5b-4edf-ad53-53aa93dab4da
Zhang, Qicheng
269be079-465e-4560-9914-c4b84f512bcb
Lu, Wenjiang
084d54a4-ff34-4c1f-90c5-91558338f6dc
Scarpa, Fabrizio
684472c3-1a28-478a-a388-5fd896986c1d
Barton, David
55e2184f-3bab-43b4-bce3-6a87dc7c3de7
Rankin, Kathryn
d9516566-0ad8-473d-b99b-4683c663a2b7
Zhu, Yunpeng
363c26ba-f671-48f6-a771-26bf881d0d1a
Lang, Zi-Qiang
dec658e4-f38f-43fc-b094-f68c43be3105
Peng, Hua-Xin
4f71af24-3d5b-4edf-ad53-53aa93dab4da

Zhang, Qicheng, Lu, Wenjiang, Scarpa, Fabrizio, Barton, David, Rankin, Kathryn, Zhu, Yunpeng, Lang, Zi-Qiang and Peng, Hua-Xin (2021) Topological characteristics and mechanical properties of uniaxially thermoformed auxetic foam. Materials & Design, 211, [110139]. (doi:10.1016/j.matdes.2021.110139).

Record type: Article

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 ν 21 ranging from −1 to 0 in the 1–2 plane and a tangent modulus E t2 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 r c. 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.

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More information

Accepted/In Press date: 29 September 2021
e-pub ahead of print date: 1 October 2021
Published date: 1 December 2021
Keywords: Auxetic foam, Finite element method, Loss factor, Modulus, Negative Poisson's ratio, X-ray CT

Identifiers

Local EPrints ID: 451676
URI: http://eprints.soton.ac.uk/id/eprint/451676
ISSN: 0264-1275
PURE UUID: 7c00d894-6af5-4884-b02e-0a6a15121c69
ORCID for Kathryn Rankin: ORCID iD orcid.org/0000-0002-8458-1038

Catalogue record

Date deposited: 19 Oct 2021 16:32
Last modified: 06 Jun 2024 01:50

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Contributors

Author: Qicheng Zhang
Author: Wenjiang Lu
Author: Fabrizio Scarpa
Author: David Barton
Author: Kathryn Rankin ORCID iD
Author: Yunpeng Zhu
Author: Zi-Qiang Lang
Author: Hua-Xin Peng

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