Stress intensity factors and crack growth rates in integrally stiffened panels

Miller, Matthew (1975) Stress intensity factors and crack growth rates in integrally stiffened panels. University of Southampton, Doctoral Thesis.

Abstract

Previous work on both continuously attached and discretely attached stiffeners and patches is reviewed. Panels with single, double and multiple stiffeners are considered. New applications of two methods for the determination of stress intensity factors are employed. The finite element method combined with cOPalianc calibration is used to deter-mine stress intensity factors in cracked panels, reinforced by 2,3, 4 or 5 continuously attached stiffeners, subjected to a uniform uniaxial tensile stress. A force displacement matching technique is developed to give a singular integral equation which may be solved, to obtain stress' intensity factors for cracked panels reinforced by continuously attached stiffeners which, may themselves contain cracks. Ancilliary problems which have been investigated include the effect cf biaxial stress and delamination of the interface between the sheer and the stiffener. The results of an experimental programme, in which fatigue crack 'growth rates are measured in model stiffened panels machined from Perspex, are presented; the effects of cut-of-plane bending and partial failure of a stiffener have also been investigated.

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