A nonlinear fracture mechanics model is formulated for analysis of mode I delamination of orthotropic double cantilever beam specimens in the presence of large scale bridging conditions. The problem is solved using a nonlinear integral equation approach in terms of stress intensity factors at the crack tip. An approximate weight function is proposed and validated numerically for a pair of concentrated forces acting on the surfaces of the delamination. The model accounts for the presence of regions of contact along the wake of the crack, which may form due to the action of the bridging mechanisms. The influence of the orthotropy of the material on the fracture behavior is investigated and the validity of approximated solutions based on beam theory is checked.
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