Error in running steady state thermal analysis 1

[ajbarua]

Hello everyone,
I am doing a thermal analysis(steady state) applying the temperature results obtained from the thermal mdoel into the stress model(selecting the odb file in predefined field) keeping Begin step,Begin increment,End step & End increment same as 1. Not able to converge with following error msg:

" Heat transfer elements cannot be used in a static analysis

At least one of degrees of freedom 1 thru 6 or 8 must be active in the model for this procedure type. Check the procedure and element types used in this model.

*temperature may not be used with elements that possess temperature degrees of freedom. Use *boundary to prescribe boundary conditions on temperature

The boundary condition used is exactly same when the same model was analysed successfully only pressure loading.

Can any one guide me to resolve the error? Corus?

thanks

 

[amubashar]

I suppose you are using Abaqus. The problem is what the error says that Heat transfer elements cannot be used in a static analysis or stress analysis. Change your element type.

 

[ajbarua]

Thanks Amu Bashar for your help.
One clarification: while transferring the temperature results(NT11) from the thermal axisymetric model to the stress model to read via the odb file by creating predefined field in Abaqus, Is it required to apply pressure loads & apply required boundary condition in addition to the thermal loads imported from the thermal model to do a steady state analysis?

My final aim is to run transient loading?

Thanks very much, especially to amubasher and corus it was really helpful

 

[corus]

It depends on the assessment you're going to make on the stresses. Some design codes require you to separate the mechanical from the thermal loads as these have different design limits from a combined loading. I'd run the thermal loads in one step, and the mechanical loads in another step, and then add them together as a new step in Viewer/Visualisation. The same would apply for a thermal transient.