Abstract
In this paper, an experimental technique to determine the stress intensity factor KIII for three-dimensional cracks using the method of reflected caustics in combination with the photoelastic stress-freezing and stress-releasing techniques is presented. The experimental model is a cylindrical bar with a three-dimensional surface crack under a load of pure torsion. To obtain the caustic pattern, a slice cut from the frozen model is annealed to release the frozen-stress. The results of this experimental method coincide favorably with the theoretical analysis results of Tweed and Rooke. Moreover, the mixed-mode stress intensity factors KII and KIII of the three-dimensional crack are separately determined using the photoelastic and caustic methods. By using the present experimental technique, the mixed-mode stress intensity factors KII and KIII for a three-dimensional crack are found to be easily separated.
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