Abstract
A method of analysis to determine stress intensity factors under mixed mode loading of a crack-stiffened panel is presented. In the analysis the stiffeners are considered to have both longitudinal and transverse stiffnesses. Case studies are presented to illustrate the effectiveness of the method. The variation of the shear stresses at the adhesive-stiffener interface are presented. The influence of these shear stresses on stress intensity factor is included. A parametric study involving the patch location, patch length, shear modulus of the stiffener, shear modulus of adhesive and thickness of adhesive is reported. The stress intensity factors depend on all these factors. The shear stress acting perpendicular to the stiffener is comparable to the shear stress acting parallel to the stiffener. There is a location of the stiffener which is the most advantageous. This is close to the crack-tip on the side opposite the ligaments.
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