Abstract
The rheological model of workpiece materials in the machining simulation plays an important role. More researchers have studied the flow stress identification, generally based on the strain, strain rate and temperatures of the only primary shear zone (PSZ), and there is not much about the influence of the secondary shear zone (SSZ) on the determination of the flow stress equation.
The conditions of the SSZ are different from the PSZ, in particular it is characterized from higher value of strain (10-20) and strain rate. This modifies the material parameters obtained considering only the PSZ.
In this paper the PSZ with the SSZ have been considered together in order to determine the flow stress of the material.
Some material models have been taken into account: the simplified Johnson-Cook model, the power law model and the Oxley model. The computation of material parameters is based on the inverse methodology (Oxley model excluded). The experimental data have been taken from the bibliography.
Some FEM simulations have been performed in order to analyze the effect of the material models deriving from different approaches.
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Pittalà, G.M., Monno, M. Flow stress determination in orthogonal cutting process combining the primary and the secondary shear zones. Int J Mater Form 3 (Suppl 1), 483–486 (2010). https://doi.org/10.1007/s12289-010-0812-2
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DOI: https://doi.org/10.1007/s12289-010-0812-2