United States Department of Transportation
i
Boundary Correction Factors for Elliptic Surface Cracks Emanating from Countersunk Rivet Holes under Tension, Bending, and Wedge Loading Conditions
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1999-03-01
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[PDF-2.71 MB]
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Edition:Final Report
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Abstract:To predict crack growth and residual strengths of riveted joints subjected to widespread fatigue damage (WFD), accurate stress and fracture analyses of corner and surface cracks at a rivet hole are needed. The results present in this report focus on the calculation of stress-intensity factor (SIF) solutions for cracks at countersunk rivet holes for tension, bending, and wedge load conditions. A wide range of configuration parameters were varied including the crack size, crack shape, and crack location as well as the length of the straight-shank hole. A finite element based global-intermediate-local (GIL) hierarchical approach was used in this study. The results are expressed as boundary correction factors (BCF), which is a nondimensional representation of the SIF. The boundary correction factors were determined along the crack front in terms of the physical angle, which was measured from the inner surface of the plate to a point on the hole boundary or the outer surface of the plate. In general, the values of boundary correction factors increased as one move along the crack front from the inner surface of the plate. The values of the boundary correction factor were highest for the crack fronts closest to the hole boundary. The trends in the solutions were the same for the three loading conditions.
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