I think that it will be good to clarify this since the approach to thermo-mechanical analyses in CalculiX can be confusing, especially for Abaqus users. Basically, there are two options to perform thermal stress analysis in ccx:
*UNCOUPLED TEMPERATURE-DISPLACEMENT step - thermal and mechanical analyses are solved sequentially - thermal simulation is followed by mechanical one in each increment and thus there’s no feedback from mechanical analysis to thermal one within the same increment
*COUPLED TEMPERATURE-DISPLACEMENT step - thermal and mechanical analyses are solved simultaneously and thus coupling works in both ways - temperature influences displacements and displacements influence temperature
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