I want to model resistance spot welding in ANSYS APDL. How to model heat generation, which happens in the highest amount at contact of two sheets? How to model electrical contact resistance or conductance?
If you are carrying heat flow analysis and subsequent deductions from there, the contact resistance can be considered indirectly by providing point or line or surface heat sources along the contact surface. The magnitude of heat source can be determined by considering Joule’s heating on the basis of known contact resistance there, which may be varying with time in a known manner. An ANSYS APDL program has to be developed for this purpose.
I have tried providing contact resistance value to line between sheets, but it doesn't seem to generate heat at passing of current. Taking room temperature as 25°C, it doesn't change at shvet contacts. I used element SOLID227 for coupled analysis.
What I have suggested is the general procedure for implementing the heat generation due to contact resistance which always works. I have not gone through the coupling feature of the solid element you have mentioned. In order to know why the program is not able to implement effect of contact resistance, you will have to go through the help and 'theory manual' where they might have explained how they are considering contact resistance, if at all.
Additionally, heating also takes place due to bulk heat generated by bulk resistivity of the material and during the later part of the heating process when the contact resistance drops considerably, it is the bulk heating which generates the heat.
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