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The role of interface and fiber anisotropy in controlling the performance of polyethylene-fibre-reinforced composites

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  • Physics


PII: 0266-3538(94)90180-5 ELSEVIER 0266-3538(94)00044-1 Composites Science and Technology 52 (1994) 449-466 ~) 1994 Elsevier Science Limited Printed in Northern Ireland. All rights reserved 0266-3538194/$07.00 THE ROLE OF INTERFACE AND FIBRE ANISOTROPY IN CONTROLLING THE PERFORMANCE OF POLYETHYLENE- FIBRE-REINFORCED COMPOSITES T. Peijs, H. A. Rijsdijk, J. M. M. de Kok & P. J. Lemst ra Centre for Polymers and Composites, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands (Received 25 February 1994; revised version received 1 June 1994; accepted 21 June 1994) Abstract The influence of the interface and fibre anisotropy on the performance of high-performance polyethylene (HP-PE)/epoxy composites was investigated. It was concluded that the relatively low experimentally found maximum values for shear and transverse strength of HP-PE/epoxy composites, incorporating surface treated fibres, are caused by a change in failure mode from debonding to fibre splitting with increasing levels of adhesion. To obtain more quantitative information about the role of fibre anisotropy on the strength of HP-PE composites, a micromechanical analysis was utilized to predict ultimate composite properties. Theoretical values for composite strength as obtained via micromechanics, assuming perfect adhesion, are in good agreement with experimental data for HP-PE composites incorporating plasma treated fibres, indicat- ing that the highly anisotropic character of HP-PE fibres plays a predominant role in the structural performance of composites based on these fibres. polymer matrices. 6 Consequently, surface modification of HP-PE fibres aimed at improved adhesion to polymer matrices has been, and still is, the subject of numerous studies. 7-28 Besides adhesion, however, another important aspect with respect to composite performance is the pronounced anisotropic character of these highly oriented HP-PE fibres. As a consequence of this

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