Abstract
The incremental step test procedure for the cyclic stress-strain curve evaluation was analysed and a new method based on the full-cycle analysis of the loading block was proposed. The computer-controlled electrohydraulic testing system was programmed to perform the test and the cyclic stress-strain curve evaluation automatically. The new method was compared with the earlier method based on half-cycle analysis. Precise and reproducible incremental stress-strain curves were obtained for polycrystalline copper and low-carbon steels. The set of these curves measured for various maximum plastic strain amplitudes was compared with the basic stress-strain curve. The difference was highest in copper and could be explained by the dependence of the dislocation structure on the plastic strain amplitude. A single specimen can be used for the experimental evaluation of the set of incremental cyclic stress-strain curves. The set of these curves represents the specific case of the service stress-strain curves that characterize the stress-strain response in variable-amplitude loading.
Published Version
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