โ Scribed by J.H. Schmitt; E.L. Shen; J.L. Raphanel
No coin nor oath required. For personal study only.
Various tension-tension and tension-shear strain sequential experiments have been performed on low carbon steel sheet along different material axes. Owing to the rapid plastic instability that occurs during the reloading in uniaxial tension of prestrained samples, the results are focussed on the evolution of the macroscopic reloading yield stress (back extrapolated stress). For a given prestrain amount, the reloading stress is a function of the magnitude of the strain path change. A parameter is proposed, which allows the comparison of different sequential loading tests: the scalar product of the unit tensors corresponding to the prestrain and to the subsequent strain modes, respectively. For low carbon steel, a single curve is obtained when the reloading stress, normalized by the stress along the monotonic strain path is plotted against this parameter whatever the combination of loading sequences and the material direction of the prestrain.
๐ SIMILAR VOLUMES