Plastic deformation and strain localizations

Abstract

This chapter gives an overview of basic knowledge on plastic deformation and strain localizations. The chapter starts with general remarks on plastic deformation continuing with details on deformation mechanisms such as dislocation glide and twinning were shortly summarized focusing for most common crystal lattices in metallic materials: (i) face-centred cubic lattice, (ii) body-centred cubic lattice and (iii) closed-packed hexagonal crystal lattice. In addition, the critical resolved shear stress is introduced and the mechanisms of strain hardening are described. Finally, different phenomena of strain localization are described distinguishing between strain localizations on microscopic scale (slip bands, deformation bands, persistent slip band and shear bands) and macroscopic strain localizations (Lüders effect, Portevin–Le Chatelier effect).