Hi. I think that deviatoric stress (as a tensor) is not provided by Abaqus default output.
Therefore, in my opinion, your best and easiest try should be to compute the deviatoric stress tensor by using the default Abaqus stress output (principal stresses).
In order to do that you should get a browse to Abaqus Manual. For Abaqus 6.11 you'll find very interesting the section located at model and visualisation, 47. X–Y plotting
"This chapter explains the concept of X–Y plotting and gives details of how to create X–Y data objects and how to produce and customize an X–Y plot. The following topics are covered:"
There you can learn to use your output data for plotting and creating new variables.
Also I must point out that you must take care depending on the sort of analysis. When working on a small deformation range you'll use additive decomposition whereas working on a large deformation range you'll use a multiplicative decomposition.
Good luck!
Thank you Sir, I am trying to use concepts prescribed in abaqus manual.
First, if you want to plot components of the deviatoric stress for the whole model at a given step you can use "Create Field output from fields", but this would be a regular field plot (not vs strain).
If you want to plot one of the components of deviatoric stress vs a component of strain use the Create XY data functions.
-1) With source "ODB field output" extract and save the components of stress and strain, and the pressure, from the point(s) of interest.
-2) Then create XY data using the Operate on XY data that will allow you to sum your pressure and stress components to get the deviatoric component in the same direction.
-3)Then create XY data using the Operate on XY data, using the function COMBINE. This will create a new XY data set that will delete the time component and leave the dependent variables of your selected data, as the new XY components.
Actually i am modelling drained triaxial test. All loads and boundary conditions applied as required and simulation has run. Now, the problem is how to extract graph of deviatoric stress vs axial strain and volumetric strain vs axial strain. I tried but it doesn't match with lab triaxial data. I have used dynamic/explicit analysis step. Shall i have to plot (S11-S33) VS LE33 ?
Yes Sir, i have to test stress strain behavior of soil through drained triaxial set up. Can you help me in this regard. I can send my input file to understand this model.
I'm not an expert in this regard but... may be the disagreement between experimental results and numerical results do not have to do with the plotting but with the material behaviour model or even the water caudal. By any chance have you checked if the numerical drained caudal agrees with the experimental? I found that sometines Abaqus goes crazy when a internal pressure is involved.
Actually i am not getting exactly the right way to plot all required curves from abaqus. I have to plot (σ1-σ3) vs axial strain and volumetric strain vs axial strain. How to extract those datas from odb field output?
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