Abstract
The formation of ripples on the surface of pure aluminum during solid particle erosion was studied using sharp alumina and spherical glass beads as erodent particles in an air-blast type system. A new laboratory technique controlled the tangential velocity of the erodent particles relative to the samples with their placement on a velocity controlled rotating disk. With this technique, it was possible to form ripples at normal angles of impact and to avoid ripple formation at oblique angles of impact. In contrast, in the static test ripples are formed at oblique impact angles and bumps are formed at normal angles of impact. Based on the experimental evidence provided by this investigation, a model for ripple formation is proposed.
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