Abstract
This parer presents an optical method for the measurement of the bending stiffness ratio of orthotropic laminates and elastic constants of orthotropic laminae. Cornu's method for the measurement of Poisson's ratio of isotropic plates is elaborated with the aid of laser holographic interferometry to measure the pure bending deformation of orthotropic laminates. A four-point bending device was made, which enables us to adjust the bending load distribution so as to eliminate distortion in the pure bending deformation. The thermoplastic plate was used in place of the photographic plate for the realtime holographic interferometry. Quadratic expressions for the fringe curves are determined by the method of least mean square. Elastic constants are determined from the coefficients of the quadratic expressions. A method is described for the confirmation of the state of the pure bending deformation. The results indicate a need for further study on the conditions for the establishment of the pure bending deformations in experiment.
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