Creep-fatigue of multi-part container during hot extrusion of copper – simulation and experimental comparison
Friedrich Krumphals1, Thomas Wlanis1, Christof Sommitsch1,2, Christian Redl3
1Christian Doppler Laboratory For Materials Modelling And Simulation, University of Leoben, Franz-Josef-Strasse 18, 8700, Leoben, Austria. 2Chair of Metal Forming, University of Leoben, Franz-Josef-Strasse 18, 8700, Leoben, Austria. 3Böhler Edelstahl GmbH, Mariazellerstrasse 25, 8605, Kapfenberg, Austria.
DOI:
https://doi.org/10.7494/cmms.2007.1.0119
Abstract:
The present paper shows the development of temperatures, stresses and lifetime consumption during three copper extrusion cycles in a two-part container. The simulation of the heat treatment and the resulting state of the container used was the basis for the subsequent modelling of the cyclic loads during the press cycles. The numerical FEM extrusion simulation consists of the plastic simulation of the billet extrusion with rigid tools as well as of the subsequent simulation of several cycles of the same process, only considering the elastic container and using the time dependent temperature and pressure boundary conditions at the contact surface billet-liner. The reason for this procedure is the much shorter calculation time for the elastic container model with specified boundary conditions in comparison to the plastic extrusion process, especially for several extrusion cycles. Both a constitutive law and a lifetime consumption rule were coupled to the elastic container model in order to get the local inelastic strain rates and the damage rate, respectively. To verify the calculated temperature and pressure boundary conditions at the contact surface billet-liner, an experimental extruding test facility was constructed.
Cite as:
Krumphals, F., Wlanis, T., Sommitsch, C., & Redl, C. (2007). Creep-fatigue of multi-part container during hot extrusion of copper – simulation and experimental comparison. Computer Methods in Materials Science, 7(1), 47 – 53. https://doi.org/10.7494/cmms.2007.1.0119
Article (PDF):
Keywords:
Extrusion, Hot work tool steels, Creep-fatigue, Lifetime, Damage
References: