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A root mean square (RMS) type stress intensity factor, , which is defined and used in  and  for crack growth and fracture calculations, is investigated in this study. Whereas the common studies use approximate numerical integration of the influence function to analyze various configurations, in the present study the definition is used analytically to derive accurate values for various ellipticaljiracks subjected to uniform tensile stress and also to pure bending. The significance of these results are explored via comparison with the exact classical maximum and minimum stress intensity factors along the front of the corresponding elliptical cracks.
stress intensity factor, elliptical crack, influence function, fatigue crack growth, strain energy release, weight function
Chief, Aeronautical Support Engineering, Halifax, Nova Scotia