Impact Angle Dependence of the Erosion by Solid Particle Impact for Metallic Materials

摘要

The aim of this paper is to estimate erosion damage under any condition involving impact angle, impact velocity, and shape and size of solid particles. Erosion tests were carried out on six metallic materials using angular silica sand, silicon carbide, and glass bead particles at impact angles ranging from 3 deg to 90 deg and at impact velocities of less than 120 m/s in a sandblast-type test rig. The dependence of normalized erosion damage relative to that at normal angles on impact angle was investigated under the foregoing conditions. The impact angle dependence of normalized erosion damage was hardly affected by impact velocity or particle size. On the other hand, for the softer materials, the shape of the particles had a marked effect on impact angle dependence. For the aluminum and iron specimens, the impact angle of the maximum erosion rate was higher with round particles than with angular particles. The impact angle, the shape of the particles, and the material hardness were all found to be factors affecting the amount of erosion damage. Finally, normalized erosion damage curves for the tested materials were well simulated with an exponential equation expressed as the product of the cutting and plastic damage terms with the parameters of impact angle and material hardness. The two exponential variables of the equation were reasonably related to the material hardness. These results suggested the possibility of estimating erosion damage at a given impact angle from that at the normal impact angle.