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Stochastic model of cavitation erosion of low-plasticity metallic materials

Gireń B. G.

Transactions of the Institute of Fluid-Flow Machinery

2006

nr 118

101-126

Stochastic model of cavitation erosion of low plasticity solids was presented. It is a kinetic type model based on the energy conservation law. Mathematical formulation comprised equations for the energy accumulation and release rates. Micro-cracks were assumed to be the main negative source of energy. In calculations carried out, the random element was omitted and deterministic dependences of energy absorbed and relaxed in the process were found. Conformability of the theoretical and experimental curves was taken in favour of the model. The material fatique effect was expressed by the delay of micro-cracks appearance with respect to the force action time. The model sets a calculation direction of the temporal development of cavitation erosion. An application to practical cases requires the use of proper loading functions, as well as probabilistic distributions of the absorption and relaxation of energy, being the function of material parameters of the destroyed solid.