I am doing a non linear analysis incorporating material and geometric non linearity. I apply a non linear ststic load higher than the linear eigen buckling load. the analysis terminates on account of excessive distortion of certain elements after reaching a particular applied load ( say 0.75 Papp). while plotting a load deflection curve , I get a good non linear load deflection response. Can i rely on those results even though it stops for excessive distortion, or do I need to incorporate something else so that it does not fail by excessive distortion. ?
The blue curve is Fy vs uy (in plane displacement) and orange curve is Fy vs uz (out of plane displacement).
Helo INAAM.
As you said that you are doing a MATERIAL non linear analysis too, I can see by the red chart on your right, that near to (2 x 280-300) there is a yielding of the material (inelastic behavior!).
This kind of behavior is common in my works. Therefore, you got the out-of-plain - yield stress (e.g. the stress in this direction combined with other
forces reach a value greater than the one of yielding of the material). From
this point ahead, the material deformation becomes bigger and the body behaves like having an inelastic buckling (big displacements with little forces increment) in this direction.
Maybe, to certify your answer, I strongly encourage you to run the same problem again, but avoid this displacement or deformation (e.g. include a false support), also check out if the model you are using, the kind of loading, the sequence of application agree with the answers that you produced.
Another question is to verify that espurious forces and stress are not provided by the model because of somekind of rigid-body motion.
Also take a look if there is no other thing allowing this movement by some part of the load applied in wrong direction.
Good luck!
Hello Arthur
Thanks for your timely response. I get errors like
1) Excessive distortion in certain elements
2) Excessive thickness change in certain elements.
It still does not explain errors arising from such an analysis.Can you recommend a good source for the same.
If my analysis stops from the above 2 errors does it mean that my model needs more validation ? Are these 2 errors justified for termination of analysis . ? I am looking for more specific literature with related to these errors
Hello
subscribe to and seek assistance from the
ABAQUS mailing list
https://groups.yahoo.com/neo/groups/Abaqus/info
Search the archive of the list before posting in it.
The list does not accept attachments.
Good luck
Frank
- Badges
- Science topic