The Impact Pressure Distribution of a Hypervelocity Raindrop.
ARMY MISSILE RESEARCH DEVELOPMENT AND ENGINEERING LAB REDSTONE ARSENAL ALA GROUND EQUIPMENT/MATERIALS DIRECTORATE
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The theory relating the impact pressure on the surface of a solid to the optical holographic fringe patterns is presented. The experimental system used to obtain the fringe patterns is presented and discussed. A water jet gun was used to obtain the hypervelocity water drop impacts, and a discussion of its validity as a simulation technique is discussed. The impact velocity of the jet was measured by breaking two laser beams a known distance apart, and was found to be 4900 ftsec. The impact pressure distribution was determined and the maximum pressure was found to be at the center of impact. A ruby laser was used to illuminate the jet, and the 10 photographs taken at 10-microsecond intervals are presented. The variation in the size of the pressure zone as a function of time is shown. The impact pressure as a function of time is presented graphically.
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