F. Gascon et F. Salazar, A PROCEDURE FOR CALCULATING THROUGH LASER SPECKLE INTERFEROMETRY THE ELASTIC-CONSTANTS OF ISOTROPIC MATERIALS, Optics communications, 123(4-6), 1996, pp. 734-742
The displacement suffered by the points located on one face of a paral
lelepipedic specimen made of isotropic elastic material is studied, wh
ile 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 displacement of
three points. The effect of the in-plane and out-of-plane displacement
s due to translation and rotation are analyzed. Extreme values for the
tilt angle are estimated, as well as the maximum diameter of the read
-out beam. The systematic uncertainty of the method is also studied. B
oth Young's modulus and Poisson's ratio are experimentally measured in
aluminum.