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Proceedings Paper

Higher-order theory of caustics for fast running cracks under general loadings
Author(s): Toshihisa Nishioka; R. Murakami; Seitaro Matsuo; Y. Ohishi
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Paper Abstract

A higher-order theory of caustics for mixed-mode running cracks is developed by using the general asymptotic solutions for a dynamically propagating crack-tip. The analytical expressions are obtained for the Jacobian equation that determines the initial curve, and for the image equations on a screen. Using the higher-order coefficients determined by the finite element simulations of actual dynamic fracture experiments, effects of the higher-order terms on the caustic curve are investigated on the basis of the present theory. It was found that the √r stress field plays important roles in the formation of caustic pattern.

Paper Details

Date Published: 1 December 1991
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Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); doi: 10.1117/12.49531
Show Author Affiliations
Toshihisa Nishioka, Kobe Univ. of Mercantile Marine (Japan)
R. Murakami, Kobe Univ. of Mercantile Marine (Japan)
Seitaro Matsuo, Kobe Univ. of Mercantile Marine (Japan)
Y. Ohishi, Kobe Univ. of Mercantile Marine (Japan)


Published in SPIE Proceedings Vol. 1554:
Second International Conference on Photomechanics and Speckle Metrology
Fu-Pen Chiang; Fu-Pen Chiang, Editor(s)

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