Abstract
In recent years, a long-standing issue is the understanding of the localization and postlocalization behaviour of plastic deformation in materials that exhibit non-monotonic stress-strain relationships (hardening, softening and possible rehardening). Such type of non-convex stress-strain graph implies that there is an unstable region where the flow stress required for further plastic flow decreases with increasing plastic strain. Several reasons for such type of behaviour may be envisaged: (i) multiplication softening arising from a rapid increase in the density of mobile dislocations after yield [1]; (ii) structural softening resulting either from a dislocation glide resistance that decreases in the course of straining due to dislocations destroying or sweeping obstacles to their motion (for an overview, see [2]) or from a transition between different types of dislocation arrangements; (iii) geometrical softening commonly caused by lattice rotation [3].
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Zaiser, M., Avlonitis, M., Aifantis, E.C. (1998). Deterministic and Stochastic Aspects of Strain Localization in the Fatigue of Metals. In: Frantziskonis, G.N. (eds) PROBAMAT-21st Century: Probabilities and Materials. NATO ASI Series, vol 46. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5216-7_32
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DOI: https://doi.org/10.1007/978-94-011-5216-7_32
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