The manner in which a rigid abrasive particle removes material from a surface is discussed. For ductile materials, it is shown that the volume removed should be proportional to V2f(α)/p, where V and α are the particle velocity and direction relative to the surface which is characterized by flow stress p. Experiments show good general agreement with prediction although some discrepancies are pointed out. For brittle materials no such complete analytical treatment is possible, but the dependence of erosion on angle and velocity was determined experimentally for several materials. In the case of glass the weight loss was observed to increase as approximately the sixth power of the velocity. A tentative explanation of this behavior is suggested.
Finally, the fluid flow conditions are discussed since these determine the number, direction, and velocity of particles striking the surface.
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