This paper deals with the multiaxial fatigue life prediction model based on critical plane for notched specimens. There are some difficulties in applying smooth specimen fatigue test results to life prediction of notched components due to the effects of stress gradients, local geometries, and incompatibility of fatigue failure definitions between smooth and notched specimens. The main objective of this paper is to evaluate one crack initiation life prediction approach, critical plane, based on correlation with notched specimen biaxial fatigue test data available. The approach has been investigated and found to be a very successful one for smooth specimens. Its applicability to notched components is being emphasized in this paper. The cracking modes of the notched specimens are shown to be totally different from those cracking modes due to the notch geometry constraint. The new values of the constant k relating the shear cracking mode parameter on the notched specimen test data have been obtained under bending and torsional loading.
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