Browsing by Author "MURAT, Levent"
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Item A COMBINED NUMERICAL-EXPERIMENTAL INVESTIGATION ON MICRO-EXTRUSION(2013-06-14) MURAT, Levent; ÖZDEMİR, İzzet; ŞENGÖNÜL, MerihIn this work, to develop an understanding on micro forming processes, a combined experimental-numerical investigation on micro forming is presented. On the experi mental side, in order to demonstrate the statistical size effect, an experimental set-up for micro-extrusion has been designed and micro-extrusion test with copper billets of different average grain size, has been conducted successfully. On the modelling side, due to large displacement and large strains developing during the forming process, a geometrically non-linear continuum mechanics description is preferred. Since a grain level description is necessary for micro forming operations, crystal plasticity is used to model the mechanical response of each grain. To this end, the crystal plasticity framework has been coded as a user defined material model and integrated into the commercial FE software Abaqus as a UMAT subroutine. With this tool, a numerical investigation on the influence of grain orientations on frictional response at small scales is carried out.