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Investigation Of Wear Of Materials By Laser Speckle Photography, Mohamed A. Seif

Retrospective Theses and Dissertations

This study utilizes a non-contact technique, laser speckle photography, to measure deformations associated with sliding wear. These deformations are those which occur on the "side" of a rectangular-section pin which is in sliding contact against a counterface disc. The "side" of the pin is illuminated by a pulsed ruby laser beam, and a double exposure specklegram is made to obtain deformations which occur between laser pulses. So, by appropriately sequencing pulses, deformation histories can be obtained, in situ. Since the exposed "side" of the thin pin specimen represents the "cover" layer under which subsurface sections lie, the deformation history observable …