UHMWPE fibre-based composites: Prestress-induced enhancement of impact properties

Fazal, Adnan and Fancey, Kevin (2014) UHMWPE fibre-based composites: Prestress-induced enhancement of impact properties. Composites Part B: Engineering, 66. pp. 1-6.

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Abstract

The impact properties of continuous unidirectional UHMWPE fibre-reinforced polyester resin composites have been investigated, to elucidate the effects of prestress on energy absorption characteristics. Prestress within composite samples was produced by subjecting the UHMWPE fibres to a creep load, which was then released prior to moulding. From Charpy impact tests, these viscoelastically prestressed samples absorbed ∼20% more energy than their control (unstressed) counterparts, with some batches reaching 30–40%. Generally, whether prestress is created through elastic or viscoelastic means, fibre–matrix debonding is regarded as being a major energy absorption mechanism in this type of composite, but this was not evident in the current study. Instead, evidence of debonding at the skin-core interface within the UHMWPE fibres was found, the skin regions possessing lower stiffness and longer term viscoelastic activity. Skin-core debonding appears to have a significant energy absorbing role within the prestressed samples and we believe it is a previously unrecognised mechanism.

Item Type:

Article

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https://doi.org/10.1016/j.compositesb.2014.04.031

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