Abstract
The effect of surface treatment of aramid fibers (Twaron®) on the adhesion between aramid and epoxy was measured with a bundle pull-out and the commonly used 3-point short-beam shear test. The adhesion of optimally treated aramid was compared to that of untreated aramid, glass and carbon fibres in epoxy using a 3- and 4-point short-beam shear test and a transverse bending tensile test. The adhesion treatment leads to a 40 % increase in shear strength and to a 60–80 % increase in transverse tensile strength of aramid-epoxy composites. Further improvement is unlikely because the properties of the composite are limited by the shear and transverse strengths of the aramid fibre itself. Despite the considerable adhesion improvement, aramid-epoxy composites still have a lower shear and transverse strength than glass and carbon fibre composites. However, the corresponding strains are approximately equal because of the lower shear and transverse moduli of the aramid-epoxy composites.
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