Based on a previous literature analysis of the stress-strain curves superposition method for the evaluation of the redundant deformation factor φ, an experimental program is proposed and carried out for SAE 1018 steel. The method is applied for tensile and compressive testing, and for multiple and single passes up to 30 percent logarithmic strains. For single passes, results for tensile testing were reasonably in accordance with those in the literature. For multiple passes, work hardening was higher for 2 or 3 passes than for 1 pass, contrarily to results for Copper in the literature. Compression testing should not be used for φ evaluation if one wants to obtain φ values similar to those in the literature.

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