An analysis of the stress-strain curves superposition method for the evaluation of the average deformation ε and redundant deformation factor φ is presented. This approach, originally proposed by Hill and Tupper, makes unrealistic suppositions, which led to some confusion in the literature concerning curve superposition criteria; the values of φ depend on the material, contrarily to Hill and Tupper’s original idea. If the technique is to be used, it is necessary to establish clear and objective superposition criteria.

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