Wear of Steel in the Lubricating Oil Containing Abrasive Particles

概要

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The wear of steel is investigated under repeated rubbing in the lubricating oil containing hard solid particles. The rolling motion of particles between two surfaces gives plastic strains on the surfaces, and the surface is worn off due to fatigue failure under repeated plastic strains. By applying the knowledges on low cycle fatigue to the contact problems, the rate of stationary wear ω is formulated. The wear tests are carried out by rubbing the fixed test piece of carbon steel on the cylindrical surface of a rotating test piece of the same steel in machine oil containing SiC particles. The results are discussed in the formula. When the concentration C of SiC particles is large, the particles bear the whole load and ω is in proportion to C^<1/2>/δ^2H or C^<1/2>E^2/H^3,where δ, H and E denote the fracture strain, the hardness and the modulus of elasticity of materials respectively. When C is small, a part of the whole load is borne by metal-to-metal contacts and ω caused by particles is found in proportion to C^<3/2>/δ^2 or C^<3/2>E^2/H^2.
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