Abstract
A test specimen in the form of a hoop with two 90° curved sections is described. When loaded in three point bending, both interlaminar tensile and shear stresses arise in the curved sections. Maximum tensile and shear stresses occur at similar locations, allowing the combined effect of these stress components to be investigated. Changing the geometry of the specimen alters the ratio between interlaminar shear and tension. Experimental results are presented for two sets of unidirectional glass fibre/epoxy specimens. It is shown that it is possible for specimens subjected to combined interlaminar tension and shear to withstand higher stresses than when subjected to only tension. This is believed to be due to the smaller volume subjected to the maximum tensile stress as a result of the stress gradient along the length of the specimen. An approach is presented to account for this effect based on Weibull statistical theory and a quadratic interaction equation between interlaminar tension and shear. Using stresses from finite element analysis, satisfactory predictions of the strength of the hoop specimens can be made.
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