Journal article
Analysis of stress relaxation in bulk and porous ultra-high molecular weight polyethylene (UHMWPE)
- Abstract:
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The reported study was devoted to the investigation of viscoelastic behavior for solid and porous ultra-high molecular weight polyethylene (UHMWPE) under compression. The obtained experimental stress curves were interpreted using a two-term Prony series to represent the superposition of two coexisting activation processes corresponding to long molecular (~160 s) and short structural (~20 s) time scales, respectively, leading to good statistical correlation with the observations. In the case of porous polymer, the internal strain redistribution during relaxation was quantified using digital image correlation (DIC) analysis. The strongly inhomogeneous deformation of the porous polymer was found not to affect the relaxation times. To illustrate the possibility of generalizing the results to three dimensions, X-ray tomography was used to examine the porous structure relaxation at the macro- and micro-scale levels. DIC analysis revealed positive correlation between the applied force and relative density. The apparent stiffness variation for UHMWPE foams with mixed open and closed cells was described using a newly proposed three-term expression. Furthermore, in situ tensile loading and X-ray scattering study was applied for isotropic solid UHMWPE specimens to investigate the evolution of internal structure and orientation during drawing and stress relaxation in another loading mode.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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- Files:
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(Preview, Version of record, pdf, 6.2MB, Terms of use)
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- Publisher copy:
- 10.3390/polym14245374
Authors
- Publisher:
- MDPI
- Journal:
- Polymers More from this journal
- Volume:
- 14
- Issue:
- 24
- Article number:
- 5374
- Publication date:
- 2022-12-08
- Acceptance date:
- 2022-12-04
- DOI:
- EISSN:
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2073-4360
- Pmid:
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36559742
- Language:
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English
- Keywords:
- Pubs id:
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1317553
- Local pid:
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pubs:1317553
- Deposit date:
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2023-01-03
Terms of use
- Copyright holder:
- Statnik et al.
- Copyright date:
- 2022
- Rights statement:
- © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
- Licence:
- CC Attribution (CC BY)
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