On the application of the optical method of caustics to the investigation of transient elastodynamic crack problems: Limitations of the classical interpretation |
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Authors: | Ares J. Rosakis Sridhar Krishnaswamy Hareesh V. Tippur |
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Affiliation: | aGraduate Aeronautical Laboratories, California Institute of Technology, Pasadena, California 91125, USA |
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Abstract: | Several possible sources of inaccuracy that occur in the classical interpretation of caustics patterns generated during transient crack growth in elastic materials are examined using a ‘Bifocal Caustics’ set-up and a new full field optical technique called ‘Coherent Gradient Sensing’. During unsteady dynamic crack growth, strict KdI-dominance is generally absent, especially at times close to crack initiation and arrest, even in regions outside the crack-tip 3-D zone where plane stress conditions persist. In such cases a truly transient higher order expansion is found to be essential for correctly describing stress fields outside the 3-D zone. |
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