Simulation of the thermal profile of a mushy metallic sample during tensile tests
2013
Strain measurement is a major challenge in tensile tests performed in a mushy
state. While non-contact technique devices like the laser speckle extensometer remain the
most reliable facility for this type of measurement, these devices are often not readily
available. So the strain measurement is usually performed by determining the length of the
‘‘hot zone’’ of the sample. This is possible with the help of the thermal profile associated with
the sample under heating. The purpose of our work is to develop a numerical model to predict
the thermal profile of a A356 aluminum alloy sample at high temperature, taking into account
the device geometry and characteristics.
We simulate the joule heating effect using the FE software Abaqus. Our model takes into
account the grips of a Gleeble machine, the thermal contact conductance and electrical
contact resistance at the grip-sample interfaces, as well as the convection heat transfer on the
free surfaces of the system. These thermo-physical properties have been determined by fitting
the experimental thermal profile obtained at 545°C. The model was then used to simulate the
temperature profile on the sample at higher temperatures (when the sample is in the mushy
state).
The thermal profile predicted by our model is in excellent agreement with the profile
obtained experimentally.
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