Abstract
The aim of this work is to provide a basic experimental information about the physical nature of plastic deformation of crystalline bodies and to show the analytical workshop within which discreet micro-structural events of the plastic flow and the accompanying effects may be accounted for. The attention is focused upon the slip which is a dominating micro-structural mechanism of deformation. The criterion for slip in the slip system is shown and discussed in terms of the effect of geometrical constraints upon the stress state and the choice of the operating system. The experimental patterns of slip during homogeneous and localised deformation are analysed in terms of the evolution of slip intrinsic features and the feedback between the mechanical, geometrical and structural aspects of slip in crystal. The analysis of the evolution of slip in crystals is supplemented by an essential information about the mechanism of slip and properties of dislocations. Interactions between dislocations of different slip systems are analysed from the point of view of the mechanisms of the strain hardening (formation of thé obstacles network) and the softening mechanisms. The correlation between slip intrinsic features and global mechanical performance of crystals is made. It is shown that the change from a stable into an unstable mode of plastic flow is caused by the change of slip from a “fine slip” into a “coarse slip” in single crystals and into shear bands in polycrystals. The latter is shown to take the origin in the mechanical instability of the obstacles network. The factors controlling the evolution of slip and responsible mechanisms are discussed in terms of the slip geometry and interactions between dislocations.
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Korbel, A. (1998). Structural and Mechanical Aspects of Homogeneous and Non-Homogeneous Deformation in Solids. In: Perzyna, P. (eds) Localization and Fracture Phenomena in Inelastic Solids. International Centre for Mechanical Sciences, vol 386. Springer, Vienna. https://doi.org/10.1007/978-3-7091-2528-1_2
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DOI: https://doi.org/10.1007/978-3-7091-2528-1_2
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