ELLIPTICAL‐ARC SURFACE CRACKS IN ROUND BARS

The crack aspect ratio influence on the stress-intensity factor of elliptical-arc edge flaws in solid round bars under tension or bending loading is discussed. The relative crack depth ξ=a/D between the depth a of the crack's deepest point and the bar diameter D ranges from 0.1 to 0.6, while the aspect ratio a/b of the flaw is made to vary from 0.0 (straight crack front) to 1.0 (circular-arc crack front). For each value of ξ being considered, the maximum stress-intensity factor is attained in correspondence to the deepest point on the crack front in the case of a/b= 0.0, while it is attained near the external surface in the case of a/b= 1.0. For intermediate aspect ratios, the stress-intensity factor presents the maximum value at the crack's deepest point for ξ≤ξCR and near the free surface for ξ≥ξCR, with the critical relative crack depth ξCR getting lower and lower as the parameter a/b is increased.

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