Abstract
In this paper, a caustic experimental method is applied to a simple case of three-dimensional stress analysis. For this purpose, a homogeneous thick plate with a discontinuously distributing load that is divided into two regions across the whole thickness of the plate is chosen as the experimental object. The characteristics of caustics formed by a reflecting light ray at any internal face of the plate are clarified. They coincide well with the theoretical caustic curves calculated using a very simplified optical theory with several assumptions. The features of caustics formed under various loading conditions and theoretical considerations are discussed in detail.
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