|
|
Creep fatigue in extrusion dies - modelling and simulation
By Christof Sommitsch, Thomas Wlanis, Thomas Hatzenbichler, and Volker Wieser
Damage, simulation, aluminium alloy, modelling, extrusion
During hot extrusion of aluminium alloys, extrusion tools experience cyclic temperature changes as well as multiaxial loading. To improve the service life of the tools, cleaner materials with advanced hot strength are designed and optimised process control is performed. For the improvement of process guiding and a comparison of lifetime behaviour of different hot work tool steels, modelling and simulation are appropriate means. The extrusion process for both a circular solid shape and a complex section was simulated with a finite element programme to find the stress and temperature history within the dies and additionally, for the complex section, to define the boundary conditions for a subsequent cyclic simulation of the die loads during service. Inelastic constitutive equations were implemented into a FEM code to describe the strain hardening and time recovery ef-fects. They include a thermo-mechanical isotropic hardening and two non-linear kinematic hardening laws. A damage-rate model predicts failure and thus the lifetime of the extrusion die.
In addition, make sure to read these articles:
On the possibility of cold deformation of medium-carbon low-alloy steel strengthened by bainitic transformation
Steel VIP - Pierre Gugliermina, Chief Technology Officer, ArcelorMittal
Evolution of the temperature profile of a controlled cooled rod section under varying durations of water quenching
Continuous success of DC EAF power supplies
Non-metallic inclusions and their distribution in the ladle before and after vacuum treatment of tool steel
Rheological model for microalloyed steels in a wide range of temperatures
Innovations in temperature controlled rolling in combination with expert systems
Physical and numerical modelling of steel process optimization
Modern charge design calculation using a computer-aided programme package
Mathematical model of deformation of round bars in a rectangular roll pass
|
 top of page
back
Tell a friend
print
read times
© 2006 GRIPS media GmbH All rights reserved. Reproduction in whole or in part without permission is prohibited.
|
|
 All external sites will open in a new browser.
GRIPS media does not endorse external sites.
|
|
