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Constant thickness unidirectional glass fibre/epoxy specimens with some of the plies on the tension side cut across the complete width have been tested in three-point bending. Four sets of tests were carried out with the span and position of the cut varied to change the ratio between overall interlaminar shear stresses and local stresses at the cut. Four-point bending tests were also performed. Most of the specimens failed by delamination from the ends of the cut plies. The results show a linear interaction between overall interlaminar shear stresses and local stresses at the cut. A method of constructing a failure envelope is proposed which can be used as the basis for predicting delamination.