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Analysis of the tensile behaviour of viscoelastically prestressed polymeric matrix composites

Pang, Jody W.C.; Pang, Jody W C; Fancey, Kevin; Pang, Jody W. C.; Fancey, Kevin S.

Authors

Jody W.C. Pang

Jody W C Pang

Jody W. C. Pang



Abstract

A novel composite material is reported, in which tension, applied to polymeric fibres, is released prior to moulding them into a matrix. Following matrix solidification, compressive stresses imparted by the viscoelastically strained fibres impede crack propagation. Previous Charpy impact studies had demonstrated that these viscoelastically prestressed composites could absorb typically 25-30% more energy than control (unstressed) counterparts and the current study focuses on their tensile behaviour as a function of fibre volume fraction, V f . Tensile testing was performed on continuous unidirectional nylon 6,6 fibre-epoxy resin samples. Compared with control counterparts, the results showed that viscoelastic prestressing improved tensile properties, the effects being V f -dependent. Increases in tensile strength, modulus and energy absorbed (to 0.25 strain) exceeded 15%, 30% and 40%, respectively, at an optimum V f , this being ∼35-40%. Strain-to-failure was reduced by 10-20%, thereby lowering any improvement in tensile toughness (energy absorbed to fracture) to < 10%. Mechanical properties of the fibres themselves were not significantly influenced by the treatment used for generating composite prestress, and we propose that the observed improvements to tensile properties may be attributed to: (i) direct contribution from compressive stress, (ii) attenuation of the dynamic overstress effect on fibre fracture and (iii) improved mechanical integrity through a more collective response from fibres to tensile loads. © 2008 Elsevier Ltd. All rights reserved.

Journal Article Type Article
Publication Date 2008-06
Journal COMPOSITES SCIENCE AND TECHNOLOGY
Print ISSN 0266-3538
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 68
Issue 7-8
Pages 1903-1910
APA6 Citation Pang, J. W. C., & Fancey, K. S. (2008). Analysis of the tensile behaviour of viscoelastically prestressed polymeric matrix composites. Composites Science and Technology, 68(7-8), (1903-1910). doi:10.1016/j.compscitech.2007.12.018. ISSN 0266-3538
DOI https://doi.org/10.1016/j.compscitech.2007.12.018
Keywords General Engineering; Ceramics and Composites
Publisher URL https://www.sciencedirect.com/science/article/pii/S026635380800002X?via%3Dihub
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