Results of tests of vibratory horn cavitation erosion conducted at Fukui University, Fukui, Japan, and the University of Michigan, Ann Arbor, are compared. The tests were primarily for mild carbon steels (equivalent to Type 1018). The results from Fukui University for various other materials are also included. The maximum mean depth of penetration rate (MDPRmax) varies approximately as horn amplitude to the 1.5 power, and there are strong increases in MDPRmax for increased specimen diameter. There are also strong effects of horn frequency.
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