Effects of friction and lubrication of resistance to compressive deformation:On surface roughness and aspect ratio of cylindrical specimens
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Effects of friction and lubrication on the deformation resistance are considered one of the most important problems in compression tests. This paper describes the basic factors in friction behavior of lubricants relating to the aspect ratio (diameter/height) of specimens.(1) When colloidal graphite oil was used as a lubricant, the following results were obtained on the mechanism of boundary lubrication. A close relationship was found between microstructure of worked surface and coefficient of friction. The rate of effects of lubricant depends on the surface roughness of the specimens. For example, when the side of specimens was roughened to about 8μ (Hmax by polishing with carborandum paper, it had superior lubrication to that of mirror-like finished surface.(2) When various sorts of lubricants such as liquid, semisolid, and solid were used as lubricants, frictional force and coefficient of friction were fairly varied according to their viscosities. For example, solid lubricants had higher holding power of lubricant films than others, and they were known to be suitable for high plastic workability.(3) The aspect ratio and friction coefficient of specimens were thoroughly discussed with respect to Siebel's theoretical equation (P/Y=1+μd/3h) in order to develop a new field of compression tests.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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