Wear of Homogeneous and Composite Materials under Conditions of Repeated Normal and Sliding Impact.

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Abstract
This report describes experimental and analytical investigations in the area of wear of materials under repetitive compound impact. A reciprocating apparatus which provides controlled, repeatable, measureable impulsive loads between specimen and counterface has been employed in wear testing. Specimen materials in previous experimentation include polymers, composites, and several alloys. That reported herein focusses upon titanium alloys, metallic composites, and copper-chromium alloys. The formation of subsurface zones occurring in impact wear appears to be significant. Correlations between subsurface strain gradients and wear have been demonstrated. These subsurface plastic deformations are dependent upon macroscopic 'solid contact' conditions imposed during impact. Temperatures occasioned at and near the wear interface are shown locally to each levels of 800C for test conditions explored. Void and crack formation in the substrate is occasionally observed, but not nearly to the extent reported for materials under conditions of sliding wear. Analytical investigations are directed toward determination of the states of stress in material specimens undergoing controlled repetitive impact. Results are derived from the equations of the linear theory of elasticity applied to a finite cylinder impacting a rough, rigid surface.

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