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Flaw Detection in Thin Composite Material Structures with Holographic Techniques.
Final rept. 1 Apr 74-30 Jun 75,
AUBURN UNIV ALA ENGINEERING EXPERIMENT STATION
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Holographic interferometry was used as a non-destructive testing method to measure the surface deformation of subsurface flaws in filament wound composite cylinders. Three cylinders with different flaw geometries were tested to determine the effect of flaws in the interferometric fringe patterns. The flaw geometries were a circular flaw one-half inch in diameter, a flaw around the circumference of the cylinder one-half inch wide and a flaw one-half inch wide parallel to the longitudinal axis of the cylinder. Equations were developed which would predict the radial surface displacement component of each cylinder. The results were presented in graphical form.
APPROVED FOR PUBLIC RELEASE