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"Weird" Difference in Stresses

"Weird" Difference in Stresses

"Weird" Difference in Stresses

(OP)
Hello all,

I am a new member in this forum, but have been following for quite a while.
I am facing an unusual problem with ABAQUS.

Basically, I am doing sequentially coupled thermal-stress analyses in car brake discs under a series of loads.

When I make a model in a .cae file, mesh and run I get reasonable temperature and stress fields. In this though, I cannot edit the mesh manually (which I need to do in order to examine what effect small changes in geometry have upon the performance of the design),because it is "tied" to the underlying CAD geometry which I have imported in the beggining.

One work-around I found was to import the .inp file, which gives me an "orphan" mesh which I can play with, having the full spectrum of tools available under the "edit mesh" tab.

The problem is that when I do all of this (and while NOT having changed the mesh, or the Boundary Conditions or anything else in the model), simply running it returns much smaller stresses for the same duty!!

Does anyone know what this could be down to? I have been scratching my head for about a week now...The thing is that, due to time constraints I cannot make a new model, repartition and remesh everything for small incremental changes to my mesh..So tinkering with the orphan mesh seems like the only option.
Any advice on why I am getting differences in the stress values would be greatly appreciated!

PS. Sorry for the long post! big smile

Thank you!

Stam

 

RE: "Weird" Difference in Stresses

Compare the *.INP files of the 2 runs.  My guess is that some card does not import from the *.INP file to the CAE and then in turn to the new *.INP file.  I hope this helps.

Rob Stupplebeen
https://sites.google.com/site/robertkstupplebeen/

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