C austic法による静的応力拡大係数の測定

概要

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There are various experimental methods for the measurement of stress intensity factors. However, generally speaking, most of these methods are rather tedious.<BR>The method of Caustic has proven to be a powerfull optical technique to measure stress intensity factors in static and dynamic fracture mechanics. This method was introduced first by Manogg in 1964 who analyzed for a stationary crack under mode-I-loading. After that, this method was further developed and extended by Theocaris and Kalthoff who applied to elastodynamic crack problems, inelastic crack problems and so on. This technique has high accuracy of the measurement, still it is easy to make a experiment. Besides the usual equipment for photography, only a point light source is required.<BR>The method of Caustic utilizes the information from the stress-strain-field within a small region very close to the crack tip. So, any knowledge about external loading and geometric boundary conditions is not necessary.<BR>In this paper, the outline of this method, especially in measuring the static stress intensity factors under mode -I-loading is shown and the applicability of this method is clarified.<BR>On the experiment, optical transmission arrangement with the 5mW He-Ne laser and optical isotropic specimen made of acrylic resin is used. Moreover, several problems concerning this method are investigated.
社団法人日本マリンエンジニアリング学会の論文