Abstract
A model is proposed in which each grain, representative of a certain orientation and strength, is embedded in a thin shell of plastic effective medium; this assembly is called an ‘effective cluster’. For each grain the plastic strain increment is chosen such that the yield surface of the effective cluster gives the macroscopic stress. The results differ from uniform-strain theories only in some cases, such as in the compression of fcc polycrystals, where ‘grain curling’ occurs.
Résumé
On propose un modèle où chaque grain, représentatif d’une certaine orientation ou d’une certaine dureté, est encastré dans une coquille plastique assez mince; ce multicrystal est appelé un ‘agglomérat effectif’. Chaque grain est supposé se déformer de manière à ce que la surface d’écoulement de l’agglomérat produise la contrainte macroscopique. Les résultats sont différents de ceux correspondants à une déformation uniforme dans certains cas seulement, tels que la compression des polycristaux cfc où l’on observe le phénomène ‘grain curling’.
Work supported by the US Dept. of Energy, Division of Basic Energy Sciences.
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Kocks, U.F., Tomé, C., Canova, G.R. (1986). Effective-cluster Simulation of Polycrystal Plasticity. In: Gittus, J., Zarka, J., Nemat-Nasser, S. (eds) Large Deformations of Solids: Physical Basis and Mathematical Modelling. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3407-8_7
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DOI: https://doi.org/10.1007/978-94-009-3407-8_7
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