A Statistically Verified Model for Correlating Volume Loss Due to Cavitation or Liquid Impingement

Rocket sled data have been used to evaluate statistically best values for threshold velocity and velocity exponent as well as the coefficient n in the relation: MDPR=K(Vsinθ-V0)α/sinnθ It is found that a reasonable assumption for most materials is that threshold velocity is zero, n = 1, and that there is a rough correlation between K and α. The correlations with the data are relatively poor. However, within the basic precision attained, a single figure of merit for the material in terms of either K or α could be derived easily. A more basic relation for the evaluation of MDPR has been assumed in terms of the energy flux model. In this relation the material properties are described in terms of an energy per volume term describing material failure. It has been found that the material energy term is best described as proportional to ultimate resilience. No correlation with any efficiency term relating liquid and material properties alone has been found.