A New Method for Three-Dimensional Stress Analysis through Total Reflection of Light (the Journal and the Transactions of the Japan Society of Mechanical Engineers)

概要

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In analyzing the stress at inner point of a body, no method has ever been employed but the photoelastic technique through interference of light. Since the method adopts application of the shear difference method, it is inherrently complicated for the determination of the value of stress components, especially when the stress distribution is not axially symmetrical. In this paper, the author presents a new method to determine the three-dimensional stresses at an inner point directly. After the photoelastic effect is frozen in a model made of photoelastic material, the model is cut and a plane of reflection is set up which contains a point where stress has to be determined, and the plane is dipped in a liquid with higher refractive index than that of the material. Measurement of critical angles and polarization of totally reflected light at the point on the plane is sufficient for determining the values and the directions of three principal stresses at the very point.
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