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dc.contributor.authorKliber, Jiří
dc.contributor.authorSchindler, Ivo
dc.identifier.citationMetalurgija. 1997, g. 36, br. 1, s. 9-13.en
dc.publisherHrvatsko Metalurško Društvoen
dc.titleMathematical description of stress-strain curve in metal forming processesen
dc.identifier.locationNení ve fondu ÚKen
dc.description.abstract-enIn response to the growing interest on the work hardening and softening processes of metallic material under the heat loading in the zone of plastic deformation, a theoretical and labaratory study was performed with the aim to examine and to define the shape of stress-strain curve in mathematical form. Classical stress- -strain curves, which are approximated by various functions have most consequential disadvantages in the possibility of describing is only in the hardening region. Very simple equations, such a Hollomon, Ludwik, Voce and others are used particularly frequently. When exploiting large deformations some new comparatives are essential. Such a type of full stress- strain curve is not fairly good at small strain ranges but quite well near and above peak strain with smoothly falling down after reaching peak strain in favour of change of bending near steady-state condition. In order to analyse the deformation characteristic of steels, continuous torsion tests were performed by different temperatures and strain rates. The activation energy as well as the peak stress and strain at peak were calculated using the sin h equation and the newly proposed model, which combines two principles: physical description of the peak stress and the empirical and mathematical definition of tt-ie peak strain.en

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Zobrazit minimální záznam