Abstract
This study was carried out to investigate the contact condition, between impacting hammer and oiled anvil. To estimate the contact condition during impact, the anvil sputtered with gold film was used. Oil film break down was evaluated by a electric resistance method. It was found that the pattern of impact prints left on a sputtered Au film were roughly divided into three kinds, a circle pattern, concentric circles pattern and random pattern. The ratio of diameter of impact print that seemed white to that of Hertzian contact circle was fairly small as compared with the dry contact condition. The squeeze film prevents from metallic contact according to the oil property. Most oils showed perfect separation due to the existence of squeeze film. As far as the relation between oil film breakdown and the kind of pattern is concerned, oil film breakdown is likely to occur when a circle pattern was recognized.
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