キャビテーション攻撃を受ける金属材料の寿命予測

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  • Prediction of Service Life of Metallic Materials exposed to Cavitation Attack
  • キャビテーション コウゲキ オ ウケル キンゾク ザイリョウ ノ ジュミョウ

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Cavitation erosion tests on metallic materials were conducted by using a water tunnel facility. On the basis of the results, a method to predict the material damage caused by cavitation attack was established as follows: The depth of the pit was chosen as the index of the damage. This increased linearly against testing time after an incubation period during which no pit appeared. With an increase in the intensity of cavitation attack, the incubation period became shorter and the slope of the linear line (damage rate) become larger. The extrapolation of these pit depth vs, time lines back to the beginning of the test resulted in a crossing of the lines on the time-0 axis. The point depended upon the material in that each material had its own characteristic point on time-0 axis. The slope of the line (damage rate) was related to the sum of the occurrence frequency of the cavitation impulsive pressure of which the intensity was larger than the tensile strength of the material. The characteristic point was related to the amount of plastic deformation which occured beneath the damage surface of the material. By obtaining the characteristic point and measuring cavitation impulsive pressure, the depth of a pit at any time can be predicted.

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