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The displacement suffered by the points located on one face of a parallelepipedic specimen made of isotropic elastic material is studied, while subject to simple compression, which generates not only strain but also both a translational and a rotation effect. The displacement is measured by double-exposure speckle photography. The elastic constants of a material are computed by measuring the in-plane...
Three mutually perpendicular slabs are cut from a block of material which is anisotropic from a thermal expansion standpoint. The three slabs are placed in a thermostatic bath and illuminated with HeNe laser light, and their speckle is registered. The set of slabs is subjected to a temperature increase, and a second speckle on the same photographic plate is exposed. Observation of the Young fringes...
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