Abstract
As part of a general effort to study the development of damage in fiber-reinforced composite materials, the method of moiré interferometry is being applied to specimens under tensile load to examine the strain field on one face of the specimen and thereby reduce displacements in underlying plies. A 600-line/mm silicone rubber diffraction grating is bonded directly to the surface of the specimen. A virtual reference grating is formed in space parallel to this active grating and a pattern of interference fringes representing lines of constant displacement is observed. The required optical elements shown in Fig. 1 are attached to a rigid plate which is in turn attached to the support columns of an MTS testing machine.
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