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As a deviation from the linear fracture criterion for mixed-mode delamination, the original Benzeggagh-Kenane (B-K) fracture criterion with a single parameter can be derived via the assumption on a common mixed-mode resistance to delamination. Through the extension to the framework of separate mixed-mode fracture toughness, a more consistent fracture criterion with two parameters is obtained. Moreover, a theoretical extension to a 3D fracture criterion is also possible. The quality of the modified fracture criterion in the description of fracture locus is investigated by numerical validations against experimental data and comparisons with other fracture criteria.

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