Abstract
An approach to predicting delamination due to the free-edge effect in a curved beam specimen loaded in bending is presented. Stress-based criteria do not give satisfactory results because of the stress singularity at the free edge. The conventional fracture-mechanics approach for free-edge delamination cannot be used because the strain-energy release rate does not reach an asymptotic value. An improved approach is developed on the basis of an assumed initial defect. The strain-energy release rate is calculated by using finite elements and this is then used to predict the failure load. Good correlation with the experimental results is obtained.
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