Recent progresses of fabrication and characterization of fibers-reinforced composites: A review

Improvement of interfacial adhesion and nondestructive damage evaluation for plasma-treated PBO and Kevlar fibers/epoxy composites using micromechanical techniques and surface wettability.

Studies on surface modification of UHMWPE fibers via UV initiated grafting

A novel route for production of auxetic fibres has been adapted from conventional melt extrusion techniques. These fibres were reproduced, characterised and tested, for the first time, to assess the potential of auxetic fibres as reinforcements in composite materials. Initial experimental work has included the embedding of single fibres in modified epoxy resin. Auxetic fibre specimens were then compared with conventional fibre specimens through a specially designed fibre pullout testing procedure. The auxetic specimens displayed superior anchoring properties. The average maximum force at de-bonding of the auxetic fibres (0.95 N) was observed to be over 100% higher than that for conventional ones (0.44 N) and the average energy required to fully extract the auxetic fibre from the modified resin was 8.3 mJ while the conventional fibre required only 2.5 mJ on average. The results indicate that composites employing auxetic fibres as the reinforcement phase will exhibit enhanced resistance to failure due to fibre pullout.

Single fibre pullout tests on auxetic polymeric fibres

Effect of oxygen plasma treatment of PPTA and PBO fibers on the interfacial properties of single fiber/epoxy composites studied by Raman spectroscopy

The pull-out behaviour of poly(p-phenylene benzobisoxazole) fibres from an epoxy resin has been shown to follow that predicted by the elastic stress transfer shear-lag model at low applied strains, but at higher matrix strains a partial debonding model was more suitable. Debonding of the fibre/matrix interface led to interfacial failure where only friction resisted fibre extraction. Raman spectroscopy was able to quantify this level of friction and together with in situ optical microscopy proved an excellent method for the close monitoring of the frictional pull-out process. The effect of fibre surface treatment was also studied. The interfacial shear stress values from the heat-treated and corona-treated fibres showed only small differences. The failure processes were examined further using scanning electron microscopy and clean fibre pull-out was observed with the heat-treated fibre whereas fracture of the free fibre occurred with the corona-treated fibre.

Interfacial failure in poly(p-phenylene benzobisoxazole) (PBO)/epoxy single fibre pull-out specimens

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Interfacial failure in poly(p-phenylene benzobisoxazole) (PBO)/epoxy single fibre pull-out specimens