Abstract
A modified linear-elastic method of analysis was proposed for the estimation of fatigue lifetimes of biaxially loaded components containing cracks. A constitutive relation of the crack growth rate, d a/ d N, was used as a basis for the analysis. The modifications included a correction for elastic-plastic behavior, consideration of Kitagawa effect, and consideration of the development of crack closure in the wake of a newly formed crack. A unified evaluation for the d a/ d N data measured by Brown and Miller in different biaxial stress states was made by use of the proposed method. It was found that the difference in elastic-plastic behavior accounted for the effect of biaxial stress on d a/ d N.
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