Drop weight impact behaviour of viscoelastically prestressed composites

Qin, Yang; Fancey, Kevin S.

Abstract

Viscoelastically prestressed polymeric matrix composites (VPPMCs) are produced by subjecting fibres to tensile creep, the creep load being released prior to fibre moulding. Following matrix curing, the viscoelastically recovering fibres generate compressive stresses within the matrix which, from previous studies, can improve mechanical properties by up to 50%. This paper reports on the first study of thin flat-plate VPPMCs, using nylon 6,6 fibre-polyester resin to form cross-fibre composite plates (CCPs) with 0°/90° fibre layers and randomly distributed discontinuous fibre plates (RCPs). Drop-weight impact testing was performed on CCPs with impact velocities of 1.9 – 5.8 m/s and, compared with (unstressed) control samples, VPPMC damage depth was reduced by up to 29%; however, this difference decreased with impact velocity, indicating little improvement above 7.7 m/s. RCPs, tested at 3.0 m/s, showed a ~30% reduction in VPPMC damage depth, compared with ~20% for CCPs, but with no changes in debonded area.

Citation

Qin, Y., & Fancey, K. S. (2020). Drop weight impact behaviour of viscoelastically prestressed composites. Composites Part A: Applied Science and Manufacturing, 131, Article 105782. https://doi.org/10.1016/j.compositesa.2020.105782

• Journal Article Type: Article
• Acceptance Date: Jan 17, 2020
• Online Publication Date: Jan 19, 2020
• Publication Date: 2020-04
• Deposit Date: Feb 4, 2020
• Publicly Available Date: Jan 20, 2021
• Journal: Composites Part A: Applied Science and Manufacturing
• Print ISSN: 1359-835X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 131
• Article Number: 105782
• DOI: https://doi.org/10.1016/j.compositesa.2020.105782
• Keywords: Mechanics of Materials; Ceramics and Composites; A. Polymer-matrix composites (PMCs); B. Impact behaviour; D. Mechanical testing; Viscoelasticity
• Public URL: https://hull-repository.worktribe.com/output/3405246
• Additional Information: This article is maintained by: Elsevier; Article Title: Drop weight impact behaviour of viscoelastically prestressed composites; Journal Title: Composites Part A: Applied Science and Manufacturing; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.compositesa.2020.105782; Content Type: article; Copyright: © 2020 Elsevier Ltd. All rights reserved.