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How to simulation thermal expansion with a T dependent CTE
Posted Dec 13, 2013, 4:17 a.m. EST Structural Mechanics Version 4.4 2 Replies
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I would like to simulate the thermal expansion of an combined object from cryo temperature to room temperature.
My current conditions are:
COMSOL version 3.5a,
simulation model is smsld,
the CTE (alpha) is defined as a function of T (Temp_smsld),
reference temperature is defined as Tinit (1K),
strain temperature is defined as Tfinal (which is controlled by the simulation from 1K-300K).
Simulations I tried are parametric and time dependent.
The simulation results I obtained were the program used the alpha at Tfinal to calculate the expansion of object from Tinit to Tfinal, e.g. alpha(Tfinal)*(Tfinal-Tinit), which is not correct.
The expected calculation should be the Integration from Tinit to Tfinal of alpha(T).
Do you have any suggestion on doing such a simulation?
My current conditions are:
COMSOL version 3.5a,
simulation model is smsld,
the CTE (alpha) is defined as a function of T (Temp_smsld),
reference temperature is defined as Tinit (1K),
strain temperature is defined as Tfinal (which is controlled by the simulation from 1K-300K).
Simulations I tried are parametric and time dependent.
The simulation results I obtained were the program used the alpha at Tfinal to calculate the expansion of object from Tinit to Tfinal, e.g. alpha(Tfinal)*(Tfinal-Tinit), which is not correct.
The expected calculation should be the Integration from Tinit to Tfinal of alpha(T).
Do you have any suggestion on doing such a simulation?
2 Replies Last Post Oct 28, 2014, 1:21 p.m. EDT
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Posted:
1 decade ago
Hi Qunfeng,
You should pre-integrate the instantaneous thermal expansion coefficient with respect to temperature and use the resulting expression in COMSOL.
Nagi Elabbasi
Veryst Engineering
You should pre-integrate the instantaneous thermal expansion coefficient with respect to temperature and use the resulting expression in COMSOL.
Nagi Elabbasi
Veryst Engineering
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Posted:
1 decade ago
I'm having the same issue. Are there any better solutions than having to integrate beforehand?