Abstract
Two mechanisms, namely, the spherical pressure wave and the microjet, have been used to account for the erosion of materials resulting from the collapse of cavitation bubbles. In recent years, however, high speed photography of collapsing bubbles has added support to the microjet mechanism. Experiments have been undertaken by the authors to examine the mechanism of the erosion of materials subjected to a cavitation environment. Stationary specimens of plasticine held in close proximity to the end of an ultrasonic horn have been damaged by cavitation in distilled water. By virtue of the features of the pits formed, as shown in the photographs in the paper, it is concluded that the cavitation erosion damage results from the impingement of high velocity microjets on the material surface during bubble collapse.
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