キャビテーション気泡崩壊圧と***ージョン

概要

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Cavitation damage was studied by both the measurements of cavitation bubble collapse pressures (impact loads) using our developed method with piezoelectric ceramics and the cavitation erosion tests of various metals in a magnetostrictive vibratory facility. Although the size of impact loads produced by bubble collapses distributes over a wide range, a threshold value for impact load which contributes to fatigue failure on the eroded surface exists and is considered to correspond to fatigue limit. Thus, this threshold value moves to the high impact load for harder materials in Al, Cu and steel but scarecely increases with the tensile strength for steels. Comparing the distributions of impact load with the assumed S-N curves of fatigue, Miner's law is realized for the incubation period and the reciprocal of volume loss rate during the stationary stage regardless of the cavitation conditions and the materials.
1988-04-25