The Relationship between Lubrication and Surface Condition of Metals Deformed under Compression

概要

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It is well known that the surface condition of deformed metal is affected by lubrication. In this paper, experimental and theoretical analyses are presented for surface condition of the specimens which are initially polished to flat surfaces and compressed by flat tools with liquid lubricants. Simple models are suggested for roughening of surface under free deformation and flattening of the surface by tool. With these models and some assumptions, the relationship between compressive strain and the fraction of the true contact area is derived as a function of roughening rate of the free surface and the thickness of the initially trapped lubricant film. The experimental result agrees well with the theoretical result. A relationship among contact area, C.L.A. roughness and lubricant film thickness is also derived from the surface model.
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