You could try changing the 'abaquslm_license_file' variable in the abaqus environment file.
On my machine, the file is in the site folder of the abaqus install and is called 'abaqus_v6.env'. May be called differently depending on version/build...
Martin
Couple of things to try;
- Remove the contact damping and clearance. Not sure that you actually need these for your model...
- Make sure that NLGEOM is set to ON.
Regards
Martin
It's because you seem to have a *PRESSURE PENETRATION defined in your model somewhere. As your original post doesn't mention any fluid pressure loading, then you've probably made a mistake in your contact definitions.
For the model shown, you should be able to do exactly as portliner says...
*NODE FILE is not supported in CAE, so you'll have to write the .inp file out and edit it in a text editor (like Notepad). You then have to submit the job at the command prompt, not through CAE.
Open the ABAQUS command window in your working directory, then type;
abaqus j=myjobname
to run...
Did you use the imperfection data from your eigenvalue analysis?
Chances are that if your structure is too 'perfect' then it will buckle at an unrealistically high load.
Martin
Plot the Load Proportionality Factor (LPF) and you should see a change in the loading at the point where the structure has buckled. You can then calculate the buckling load by knowing the LPF and the magnitude of your actual loading.
Check in the manual; "Unstable Collapse & Post-Buckling...
In your eigenvalue analysis run, you need to request output to a .fil results file. You can then use those results using the *IMPERFECTION, FILE=xxxxx keyword in your riks analysis.
There is a good example of this type of analysis in the ABAQUS docs - "Buckling of an imperfection-sensitive...
It should work okay. Have you used a kinematic coupling? Have you coupled the necessary degrees of freedom?
I can't look at your CAE file I'm afraid, as I don't have access to CAE at home.
Martin Stokes CEng MIMechE
I'm sure that you can create the coupling constraint in CAE - it's in the Interaction module.
Create the reference point, then create the coupling constraint by picking the ref point and then the surface you want to couple to. CAE will create the node set for you when you mesh the part in the...
Have a look at using a reference point and a coupling constraint. You can couple the reference point to a node set, then apply the torsion to the reference node.
Look up "Kinematic Coupling Constraints" in the ABAQUS Users Manual - there is an example there of how to apply a torsion load...
You've got duplicate *MATERIAL cards in the input file -remove these and see if it works.
That a legal copy of ABAQUS you have there..?
Martin Stokes CEng MIMechE
