Abstract
A sheet metal forming simulator which stretches a strip around a cylindrical pin was used to investigate the relationship between friction and process variables including sliding speed, strip strain and strain-rate in the boundary lubrication regime. Measurements were conducted with two different sheet and tooling material combinations: electro-galvanized steel sheet on smooth A2 tool steel and commercially pure aluminum sheet on cemented carbide. In the first system, friction tends to increase with strain in contact. This supports a friction model which treats the influence of plastic strain on the flattening of strip asperities and real area of contact. In the second system friction was found to decrease with the strain in contact. This is apparently due to a decrease in contact area associated with roughening of the strip by plastic deformation.
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