Abstract
The shadow-moire method has been extended to study the large displacements of a uniformly loaded hyperbolic-paraboloid shell. The new technique employs a curved grating which is everywhere equidistant from the initial position of the surface, as in the application of a plane grating in the study of plates. The theory of the curved grating is developed. Experimental verification is reported and a significant increase in accuracy over the equivalent plane grating is observed. The proposed improvement can be applied to the study of any ruled surface.
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