Thermomechanical coupled simulations

[sadiksefaacar]

Hi, I have a few questions regarding the thermomechanical coupled analyses. 1- Is it possible to assign an average temperature boundary condition? 2- for the temperature dependent variables in Hooke's Law, we are defining constants for the polynomial function. what is the correct form that should be used in the material card because DAMASKv3 documentation, one of the corresponding parameter in the material card looks like C_11,T: -3.691e+7 but the solver is issuing invalidyaml error. using quotation marks such as 'C_11,T': -3.691e+7 fixed the error but I am not sure that this is the correct form. 3- Is it possible to set temperature-dependent plasticity parameters, such as defining tau_0 as a function of temperature ? I have tried 'xi_0_sl,T':[value] using quoatation marks similar to the previous question. solver did not prompt error but I am not sure if this is the correct method.

[eisenlohr]

Hi @sadiksefaacar,

Question 1: Yes, it is possible to set an average temperature for the whole RVE. See my answer to #76, which would even allow locally varying initial temperature values.

Question 2: The example syntax is correct. I do not see why you get an invalid YAML error without further details on your material configuration. Regarding the format, the temperature-independent value is termed $X$, the linearly dependent component is termed $X,T$ and so forth for $X,T^2$, ...

Question 3: There is presently no temperature dependence for the initial slip resistances. One can mimic such behavior by introducing separate material IDs for each distinct xi_0_sl value, though.

[sadiksefaacar]

Professor Eisenlohr,

Thank you for your reply.
For the first question, I understand that we can assign an initial temperature distribution, is it possible to impose a time-dependent average temperature boundary condition, similar to $\bar{F}$ and $\bar{P}$, which would allow to use the temperature directly as a thermal load?

[eisenlohr]

Assigning $T$ or $\dot T$ as a boundary condition for the thermal field is not (yet) possible. However, one can use a heat source to achieve a time-dependent change in temperature (either uniformly or, with spatially differing heat powers, heterogeneously).