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Determination of Stress Intensity Factor KIII for Three-Dimensional Crack by Using Caustic Method in Combination with Stress-Freezing and Stress-Releasing Technique

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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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Acknowledgments

The authors thank the National Natural Science Foundation of China (No. 11427802 and No. 11172026) and the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20131102110014) for their supports.

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Wu, D.F., Shang, L., Pu, Y. et al. Determination of Stress Intensity Factor KIII for Three-Dimensional Crack by Using Caustic Method in Combination with Stress-Freezing and Stress-Releasing Technique. Exp Mech 56, 463–474 (2016). https://doi.org/10.1007/s11340-015-0113-2

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