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Improving the prediction of tensile failure in unidirectional fibre composites by introducing matrix shear yielding

This paper develops a model I developed to predict the tensile strength of unidirectional composite materials. The student Behzadi extended the Monte-Carlo model to include the effects of matrix shear yielding at high strain regions around fibre breaks. This greatly improved the predictions of failure stress/strain. The model now permits the strength of these materials to be predicted from the basic fibre/resin properties alone and accurately represents the observed failure mechanisms, including the sequence of fibre failures. Further work is using CT inspection to confirm the predictions. The model is aiding the more effective use of composite materials.