Abstract
Abstract
The frozen-stress photoelastic stress analysis technique is used to obtain the mode I and mode II stress-intensity factors for cracks in round bars. The bars, which are subjected to bending, contain cracks inclined to the transverse planes of the bars. Results for inclinations of 45, 60, 75, and 90 degress are obtained. Crack depths of 0.3 ×, 0.5 ×, and 0.7 × the diameter are investigated. The results are normalized so that they can be applied to similar shaped cracks in bars of any diameter and material subjected to bending. The agreement with previously published results (for the pure mode I case) is very good, i.e., within 3 percent. The choice of normalizing parameters makes the normalized mode I and mode II stress-intensity factor relatively insensitive to the crack inclination. The mode II stress-intensity factors are practically constant along the crack fronts whereas the mode I stress intensity factors fall sharply near the ends of the crack, i.e., where they break the surface of the bar.
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