Abstract
The optical method of caustics is one of the most powerful techniques for evaluating stress intensity factors in static as well as dynamic fracture mechanics problems. In the method of transmitted caustics, optically anisotropic (birefringent) materials such as Araldite B and polycarbonate are often used. Double caustic curves appear for the tip of a crack in an optically anisotropic plate due to the birefringence. In this paper, a theory of caustics was developed for stationary cracks in birefringent materials under in-plane mixed-mode conditions. Completely analytical expressions were derived for the double caustic curves as well as for the double initial curves. The combined effects of optical anisotropy and mixed-mode state on the caustic curves and initial curves were investigated. A new procedure was also developed for the evaluation of mixed-mode stress intensity factors using the characteristic dimensions of the double caustic patterns.
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Schedule a callMore From: JSME international journal. Ser. A, Mechanics and material engineering
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