Abstract
A unified procedure is proposed to compute both the stress intensity factor (SIF) and the fatigue crack growth for part-through cracks in complex structural details. This method is an extension of the approximate three-dimensional (3D) weight function (WF) method in solving both SIF and fatigue crack growth problems for complex structural details using only the stress distribution in perspective crack sites. The fatigue crack growth analysis is based on the plastic deformation induced crack closure mechanism which is determined according to the strip yielding model. Cycle-by-cycle fatigue crack growth predictions have been made based on Elber's crack growth relation. The fatigue crack growth analysis is closely related to the cyclic stress experience, the configuration of structural detail, the applied load spectrum and the material property. The advantage and limitation of the method have been discussed. Some examples have been provided for the fatigue crack growth analyses for structural details of a Swedish fighter/attacker aircraft to demonstrate the methodology. This paper shows that an efficient, solid, unified theoretical frame can be established for reliable analyses of the fatigue crack growth in complex structural details for general engineering applications.
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