Wave motion in anisotropic media by dynamic photomechanics - Ultrahigh-speed photographic techniques are developed for photomechanically recording wave propagation in composites and rock

Photomechanical techniques are developed for studying wave propagation in anisotropic media such as fiber-reinforced composites and rocks. Moiré fringes in transparent and opaque materials, and isochromatic fringes in transparent composites, are photographed at rates up to over one-million frames/second. A Beckman and Whitley 189 framing camera is utilized with illumination provided by argon flashbombs or a special electronic flash.