Deformation and Fracture of Ductile Materials
This chapter is dedicated to the study of the deformation and fracture behavior of ductile materials. Ductile materials are characterized by their capacity to withstand large deformation and to be able to deform permanently (see also the comparison shown in Fig. 1.2). Plastic deformation of metals is often described using continuum mechanics techniques, such as crystal plasticity theories [285–287] or strain gradient formulations [288, 289]. Significant research effort has also been put into the development of mesoscopic discrete dislocation dynamics techniques [50, 95–101]. Yet another approach is to study plasticity using large-scale atomistic simulations. The basic carriers of plastic deformation in crystals are dislocations. Therefore, most of the discussion in this chapter will be focused on the behavior of these basic elements of plasticity. In this chapter, we will review a continuum theoretical and atomistic approach in treating the nucleation, propagation, and interaction of dislocations. The ductile character of the material is captured by the specific interatomic potential. As discussed earlier, for many metals, appropriate EAM-type potentials have been developed. This discussion will be limited to FCC crystals (since several well tested interatomic potentials exist for this class of metals).
KeywordsBurger Vector Stack Fault Energy Atomistic Modeling Partial Dislocation Ductile Material
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