POLÁKOVÁ Ivana COMTES FHT a.s.

Spoluautoři KUBINA Tomáš

Correct models of deformation behaviour of materials are key to numerical modelling. The present paper compares two approaches to obtaining adequate data sets which could provide an accurate description of the dependence of flow stress on thermodynamic quantities. The first one relies on physical modelling. In this approach, compression tests are carried out and their results are converted into a form which may be processed by simulation programs. The latter approach consists in using the JMatPro software, which is built around CALPHAD (Calculation of Phase Diagrams) methodology. Input data required for calculating flow stress include the chemical composition of the material and information on one of its fundamental mechanical properties (yield strength, ultimate strength, hardness or grain size). Using the above-mentioned approaches, a wide range of metallic materials were processed and the resulting data were evaluated. For selected specific materials, detailed comparison of flow stress models will be undertaken. The effects on simulation of a plain mechanical test will be evaluated.

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