# Mechanical-Thermal analysis - sequence

**URL:** <https://calculix.discourse.group/t/mechanical-thermal-analysis-sequence/505>\
**Category:** Uncategorized\
**Created:** [March 24, 2021, 8:23am UTC](https://calculix.discourse.group/t/mechanical-thermal-analysis-sequence/505 "2021-03-24T08:23:38Z")\
**Posts on this page:** 1\
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**Author:** ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\
**Post date:** [September 15, 2021, 11:37am UTC](https://calculix.discourse.group/t/mechanical-thermal-analysis-sequence/505/2 "2021-09-15T11:37:44Z")

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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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