An approach to predicting delamination due to the free-edge effect in a curved beam specimen loaned 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 rare does not reach art 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,vith the experimental results is obtained. (C) 1998 Elsevier Science Ltd. All rights reserved.
|Number of pages||7|
|Journal||Composites Science and Technology|
|Publication status||Published - 1998|
- finite-element analysis
- free-edge effect
- curved beams
- fracture mechanics