Abstract
The mechanisms by which the roughness of free surfaces of sheet metal increases with plastic deformation were investigated by tracing the surface profile of steel sheet deformed in the as-received condition under several stress systems and the surface profile of initially-polished tensile specimens with and without isolated engraved grooves. The observation of Tadros and Mellor that no single feature grows throughout deformation to initiate local instability was confirmed. The rate of roughening of sheet deformed in the as-received condition increased as the ratio of the in-plane principal strains decreased, in accord with the conclusion of Tadros and Mellor (who studied the growth of a transverse groove under different stress systems), but did not correlate strongly with equivalent plastic strain as found by other workers. It appeared to vary with the coefficient of normal anisotropy.
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