Impact and Cavitation Erosion and Material Mechanical Properties

摘要

The mechanisms of mechanical cavitation and liquid impingement damage are reviewed. In the light of available experimental and photographic evidence it is concluded that the predominant mechanisms in real flow situations of mechanical cavitation damage and liquid impingement damage are very probably the same, i.e. liquid jet impingement in both cases. Numerical data relating to the microjet diameter and velocity in the cavitation case is presented. A comprehensive data set involving only metallic materials, but with tests conducted in several types of cavitation facilities as well as liquid impact facilities, is used to obtain a relatively simple best fit correlation in terms of conventional mechanical properties of materials. It is concluded that no very precise correlation of this type with general applicability even for metallic materials is possible, and that a standard error of estimate factor for a new material is of the order of 2.5. (Author)