Determination of Stress Intensity Factor by Surface Reflected Caustics

概要

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The purpose of this investigation is to verify the theory of the surface reflected Caustics, which is one of the optical method for stress analysis, and then to establish how to determine the stress intensity factor exactly. The experiment was performed using plates of acrylic resin to examine the influences of the condition of measurement on an accuracy of the measured value such as the location of the optical system, the shape of crack tip, the thickness of plate and a loadind step. As a result, the relationship was found between the measured value and the condition of measurement. It was also found that there existed an invalid range in the previous theory. However, we could determine the theoretical value from the measured one using the procedure which was developed in this investigation.
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