ELLIPTICAL‐ARC SURFACE CRACKS IN ROUND BARS

Publisher Website
Google Scholar
Abstract
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.