Structural analysis - How to simulate a safety factor distribution 1

[abc99000]

Hello,
I'm trying a model to simulate thermal stress distributions in each component in a 3-cell stack planar solid oxide fuel cell.

It consists of interconnect, sealing, porous nickel mesh, and PEN (positive electrode-electrolyte-negative electrode).

The analysis procedure is from 25°C to a high operating temperature (non-uniform temperature profile, between 650°C-800°C).

I can get the stress distributions at operating temperature, but I don't know how to use Abaqus to simulate the safety factor distribution if I have critical stresses of each component at 650, 700, 750, 800°C.

Sealing (25°C) and PEN are brittle materials, using maximum principal stress to assess failure criteria.

Sealing (650-800°C), interconnect, porous nickel mesh are ductile materials, using maximum Tresca equivalent stress to assess failure criteria.

Thanks.

 

[Mustaine3]

Tools -> Create Field Output -> From Fields

This allows to create custom fields based on all your stress limits. Like 'limit/stress=safety factor'.
Then you can display the field with only the appropriate component of your structure.

An alternative, but much more work, is using Python scripting to create those new field in the result file.

 

[abc99000]

Thanks for answering.

I can get a simple user-defined field output by this process. Like all value *100 or /100.

However, I'm wondering if it is possible to choose a certain area to do a certain calculation.

Like a sealant in this model has a non-uniform temperature profile between 650°C-800°C. And I want to do:

stress in the area at 650-700°C: all value*110
stress in the area at 700-750°C: all value*120
stress in the area at 750-800°C: all value*130

Thanks.

 

[FEA way]

In CAE you can only display elements with these values (by changing scale of contour plots) and create Display Groups with them. Then create that custom field output and plot it for selected display group only. Unfortunately it's not possible to do exactly what you want - apply custom field output expressions for different parts of model at the same time. This can only be done in another postprocessing software or using scripting.

 

[abc99000]

Thanks for answering.

I get the point.