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type, with different lattice structure and hardness has been performed. Three mechanisms of the microindentation process: smooth, impulse and rosetteless, have been established. The development (occurrence) of the certain indentation mechanism is depended on the structure lattice and deformation temperature too. 1. Introduction
14. Detailed and quantitative understanding of size effect is essential for a reliable design Many of failure mechanisms are stress-driven It is critical to know the strength of a component in a device and hence the level of stress it can support. gtresearchnews.gatech.edu/newsrelease/mems-cad.htm.
The mechanisms that cause plastic deformation differ widely. Plasticity in metals is a consequence of dislocations while in brittle materials such as concrete, rock and bone, plasticity occurs due to the slippage of microcracks. There are two prominent mechanisms of plastic deformation in metals and they are Slip Twinning Slip and Twinning is studied. A phenomenological plasticity model in which the primary deformation mechanisms, slip and (extension) twinning, are treated separately is developed and incorporated in the finite element framework. Deformations caused by these mechanisms are modelled by a symmetric and an asymmetric plastic potential. It is demonstrated that the
type slip is the dominant deformation mechanism at the early stage of plastic deformation, whereas <c+a>-slips be-come dominant with further increase in deformation strain. Keywords: Deformation mechanisms; Geometrically ne-cessary dislocation; Slip line; Transmission electron micro-scopy; Electron backscatter diffraction 1. Introduction