Studies on cavitation damages. Discussion

Tests in a new chamber for flow cavitation led to damages which are characteristic of erosive destruction caused by imploding cavitation bubbles. To develop material of greater cavitation resistance, it is necessary to find out exactly the different stages of damage. To do this, we started to examine model materials in a special testing chamber. In the case of soft aluminum, these damages. caused by single imploding bubbles, give an idea about the way of load that is the effect due to micro-liquid-jets which impact the specimen surface under special conditions. Typical stages of deformations, formation of cracks and fractures are described with regard to the structures of the model materials by scanning electron microscope. To transfer the different stages of damages from one material to others of the same crystalline structure, changes at different stages caused by the different mechanical properties, for example, as in the case of copper, must be taken into consideration.