Abstract
1. The initial dislocation density of materials in friction has a substantial effect on the ratio of elastic to plastic strains produced during friction. When the dislocation density is very low or very high, elastic strains form a larger part of the total strain. With moderate dislocation densities, the total strain increases mainly as a result of an increase in the plastic strain component, although the absolute magnitude of elastic strains is larger than that of residual strains. 2. Materials which undergo heavier plastic deformation during friction have larger friction coefficients. 3. The initial dislocation density affects the friction force to the extent that it affects the magnitude and the ratio of the elastic to plastic strain components during friction, the effect of plastic strains being predominant.
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