The effect of short carbon fibers on viscoelastic behavior of UHMWPE
2022 (English)In: ECCM 2022 - Proceedings of the 20th European Conference on Composite Materials: Composites Meet Sustainability / [ed] Vassilopoulos, Anastasios; Michaud, Véronique, Lausanne: EPFL Lausanne, Composite Construction Laboratory , 2022, Vol. 1, p. 314-321Conference paper, Published paper (Other academic)
Abstract [en]
At service temperatures, ultra-high molecular weight polyethylene (UHMWPE) is a highly viscoelastic (VE) material due to its low glass transition temperature (≈-113 °C). Since the mechanical response changes over time, the ability to predict and improve its performance over lifetime is an engineering concern. Adding short carbon fibers (SCF) as reinforcement (10 wt%) is expected to improve the material instant and long-term properties. VE relaxation functions for UHMWPE and composite at different temperatures (25-100 °C) are obtained from experimental data used to find parameters in a Schapery's type linear VE model. Then, relaxation functions of the SCF (randomly distributed) composite are predicted using the quasi-elastic approach. The results show that fibers affect positively the VE properties of UHMWPE and that the temperature- and time-dependent matrix behavior affects the stress transfer to fibers However, due to uncertainty regarding the input parameters, limiting the applicability of the chosen quasi-elastic approach, the quantitative agreement is not perfect.
Place, publisher, year, edition, pages
Lausanne: EPFL Lausanne, Composite Construction Laboratory , 2022. Vol. 1, p. 314-321
Keywords [en]
quasi-elastic approach, reinforced thermoplastic, stress relaxation, viscoelasticity
National Category
Composite Science and Engineering
Research subject
Machine Elements; Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-95875DOI: 10.5075/epfl-298799_978-2-9701614-0-0Scopus ID: 2-s2.0-85149176225ISBN: 978-2-9701614-0-0 (electronic)OAI: oai:DiVA.org:ltu-95875DiVA, id: diva2:1743332
Conference
20th European Conference on Composite Materials (ECCM20), June 26-30, 2022, Lausanne, Switzerland
Funder
The Kempe Foundations, SMK-1738
Note
Funder: ERDF; "Post-doctoral Research Aid” of the Specific Aid Objective of the Operational Programme “Growth and Employment” (project No. 1.1.1.2/VIAA/4/20/641)
2023-03-142023-03-142023-03-14Bibliographically approved