The white light speckle method is used to obtain the interior displacement at different planes of a block with a central idented load, and of a prismatic bar of square cross section under torsion. The problem of decorrelation of speckles due to tilt is not encountered in this method, resulting in reasonable fringe patterns, and good agreement between the displacements obtained with this method and that predicted by the theory of elasticity is found.
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Asundi et al. (1983) studied this question.
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