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On the importance of initial volume of eroded material for cavitation erosion curve

Szkodo M.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 18, nr 1-2

311--314

Purpose: Cavitation erosion is a surface degradation mechanism which occurs most frequently in fluid-flow machines operating in cavitation conditions. To find way to prediction the cavitation erosion progress, simple mathematical model was proposed. Design/methodology/approach: The model assumes that curve of cumulative volume loss as a function of time approaches initial volume of eroded material. This principle causes dependence of cavitation erosion curve not only from mechanical properties of eroded material and cavitation loading but also from dimensions of initial volume i.e. eroded area of material and even height of cross-section of eroded initial volume of material. Findings: Assessment of cavitation erosion resistant of material upon the base of cavitation erosion curve has to take into account this influence. In the paper the influence of these parameters on the cavitation erosion curve was discussed. Research limitations/implications: Future research concerning cavitation erosion resistance of materials ought to takes into account influence of initial volume of eroded material for cavitation erosion curve. Reported research ought to be completed and full cavitation curves (volume loss in time) for different initial volume of eroded material must be done. Practical implications: Existing standards have recommended assessment of cavitation erosion resistance of materials by comparison of their erosion curves (volume loss in time and volume loss rate of erosion). For this reason one should strive to explanation all factors influencing on the cavitation erosion curve. Originality/value: The work proposes a mathematical model which permits to define the influence of initial volume of eroded material on the cavitation erosion curve.