Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

A thermodynamically consistent model for elastoplasticity, recovery, recrystallization and grain coarsening

 
: Kertsch, L.; Helm, D.

:
Volltext ()

International Journal of Solids and Structures 152-153 (2018), S.185-195
ISSN: 0020-7683
Deutsche Forschungsgemeinschaft DFG
SPP 1713; HE 3096/7-1
Strong Coupling of Thermo-Chemical and Thermo-Mechanical States in Applied Materials
Deutsche Forschungsgemeinschaft DFG
SPP 1713; HE 3096/7-2
Strong Coupling of Thermo-Chemical and Thermo-Mechanical States in Applied Materials
Englisch
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWM ()
microstructure; thermomechanical process; constitutive behaviour; elastic-plastic material; recrystallization

Abstract
We present a model for the thermomechanical behaviour and microstructure evolution of metallic materials during thermomechanical processing. Special emphasis is put on its derivation based on the Müller-Liu procedure which ensures consistency with fundamental physical principles. The model represents in principle the strong coupling between elastoplastic deformation, recovery, recrystallization, grain coarsening and related thermal effects. Furthermore, it takes the dragging effect of precipitates on grain boundaries and dislocations into account by which a higher strength can be achieved and the grain size is stabilised. For the microstructure description, we use a mean-field approach. In several numerical examples, we demonstrate the capability of the model to consistently predict the interplay between elastoplastic deformation, microstructure evolution, dynamic hardening and softening and the related temperature change.

: http://publica.fraunhofer.de/dokumente/N-531066.html