Stress and System Energy in Erosion Process for Brittle Materials

Erosion tests on high strengh refractory castables were carried out using SiC grains at impact angles of 30 degrees,45 degrees,60 degrees,and 90 degrees with the velocity of 5m/s.In order to study the variation in stress and system energy with impact angles during solid particle erosion process,a single particle erosion model was designed by means of three-dimensional explicit dynamic software ANSYS/LS-DYNA according to experiment parameters. The Johnson-Holmquist brittle ceramic model was employed to model the failure of target material. The impact angles varied from 15 degrees to 90 degrees in increments of 15 degrees.The simulation results were compared with erosion rate values from experiments. The results show that the variation trends of both the maximum stress of targets and system total energy loss are in a good agreement with experiment data,which increaes with increasing impact angle. The variation of erosion rate as a function of impact angle can be explained by the variation of the maximum stress of target material. The rule "the maximum erosion of typical brittle material occurs at 90 degrees" is confirmed by the view of energy analysis.