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This paper studies the effect of initial crack location on the face/core debond  fracture toughness under different mixed mode loading conditions. The mixed mode  loading at the crack tip is defined in terms of the mode-mixity. In order to  achieve the desired initial debond crack location, a pre-cracking technique is  developed, where the mode-mixity, number of cycles, crack increment and load  level are accurately controlled. Results show that the debond fracture  resistance of foam-cored sandwich specimens depends on parameters such as  loading condition (mode-mixity), core and face properties, as well as initial  debond crack location. Lower fracture toughness values were measured for  specimens with the initial crack location in the face laminate

Effect of Initial Debond Crack Location on the Face/core Debond Fracture Toughness