Abstract
An optical method is developed to measure crack opening displacement (COD) in the inside of a PMMA plate specimen. The crack is a through-crack and propagating at a speed of several hundred m/sec. The crack is illuminated with a pulsed laser beam, which is weakly scattered by the two crack surfaces. The scattered light waves make interference fringes on the crack surfaces. Determination of the orders of the interference fringes are based on a result of COD measurement on a specimen surface by means of pulsed holographic microscopy. The COD in a specimen is obtained from the fringes. The COD measurement in a specimen is carried out in the vicinity of the crack front edge where the crack has three dimensional shape.
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