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Mode I static fracture behavior of polymer composites is studied using the tapered double cantilever beam test method. A non-linear three-dimensional finite element model is developed to analyze the test data. The fracture toughness is evaluated using a J-integral approach. A non-uniform distribution of the J-integral value along the crack front is obtained with maximum at the mid-plane of the specimen. It is shown that taking into account the damage induced non-linear behavior improves the fracture toughness. This is explained with increased strain energy dissipation as a result of the non-linear behavior.