1976 Volume 2 Issue 4 Pages 399-404
Experimental studies were conducted in a vibratory cavitation erosion facility at a frequency of 19.9 kHz and double amplitude of 28 μm for metals including aluminium, brass, iron and steels. Observing the life history of eroded holes on the specimen and of a certain single hole as well, two different types of damage were found and the following conclusions were obtained. (1) The mechanism of cavitation damage on the metals changes them from ductile to brittle with the lapse of testing time. A dimensionless number was introduced as a quantitative criterion to identify the degree of cavitation damage. (2) This transition of the mechanism depends upon the experimental conditions as well as upon the properties of the specimen. (3) A part of the variation in erosion rate is caused by this transition of cavitation damage mechanism.