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A new type of test facility for simulating impingement and cavitation damage is described. The facility consists of a rotor with a material specimen attached at the periphery in such a manner that there is repeated impact with a column of liquid drops during high-speed rotation of the specimen in vacuum. Impact speeds up to 1250 ft/sec were employed. Preliminary tests indicate that erosive weight loss from the specimen is similar in character to that produced by other cavitation damage facilities. In some instances, weight loss appeared to be directly associated with the fatigue failure properties of the material. A refined ability to control impact conditions permits detailed study of the failure mechanics. While primarily intended to simulate a postulated cavitation damage mechanism, it may prove useful in simulating other impact damage applications.
accelerated test, cavitation, impact, erosion, fatigue
Ripken, J. F.
Professor, University of Minnesota, Minneapolis, Minn.