Inelastic damages by stress wave on steel surface at

In cavitation erosion, stresswaves will be generated and propagated in the solid when a collapse impingement
is acted on it. The cavitation damages on the solid surface are considered to be under the effect of
the stresswaves. An ultrasonic vibration cavitation erosion experimentwas performed on a polished steel
specimen, and not only the plastic deformations but also the brittle fractures appeared on the surface at
the incubation stage of cavitation erosion. Some characteristics such as the hemispherical shape of the
crater, intergranular fractures and subsurface comminution make the damages distinguishable from the
common plastics deformations, and they are thought to be the results of shear waves. Thus, stress waves
are proved to take part in the cavitation erosion, and they bring some special damage styles depending
on the conditions of the impaction and mechanical properties of the specimen. 扫描探针显微镜(SPM/AFM/STM)