ThomasH,
The general MISCONCEPTION people have about any FE software is that,
1. FE softwares are softwares that could analyse plate/shell and solid elements alone. In addition, these software also presents 'colourful' plots.
2. Most of simple 'beam' or spaceframe softwares are not FE...
Hondaknight1,
I disagree with you (as I understand the statement differently), and I do not want to argue further on how we interpretate statements. My point is Staad is based on FE code.
Cheers!
Yugablan K
ThomasH,
Staad is not a FEM software? I seriously doubt that.
Staad is a general purpose analysis tool that works predominantly with space frames, and not really recommended for plates and shell. But it is based on FE code for truss and beam elements.
Cheers!
Yugabalan K
Hello all,
Just a silly concern. If this is axisymmetric problem, why not just use an axisymmetric element with 2 DOFs. Is it necassary to to model a fourth or an eighth model using shell elements? Or is there something I am not catching here?
This should be a pure 2D problem. Cheers!
Yugabalan K
According to Gio1, for pure torsion s3 and s1 is of the same magnitude. Why do we need to consider sigma2 in fatigue computation? The magnitude will not be as high as s1 and s3 in the first place.
I would say that a double amplitude stress range between s1 and s3 is valid in this case. I do...
Gio1,
Sounds logical to me although I have not personally encountered such situations. Its a common understandting that stress range is used (in your case, the range from sigma3 to sigma1) in fatigue computation. Any other views?
Yugabalan K
Normm,
Von Mises criterion is only for strength assessment. For fatigue assessment, sigma 1 or sigma 3 to be used, regardless your material is brittle or ductile. Note that it is also important to determine the principal stress direction. Typically, fatigue crack initiation occurs in the...
Hi Gio 1,
You should use principal stress, not von mises stress. But it can be tricky on choosing either max principal or min principal stress. Good luck anyway. Cheers!
yugabalan k
I am assuming here that 'adaptive descent' means automatic time steping. Is this what you are refering to?
If so, it is obvious that with the automatic time stepping you will end up with better result, but longer in solving time. It is also important to know that your time step size will also...
rh 142,
I think you have very crude understanding of non-linear buckling analysis. But its ok. I will try my best to explain it to you.
One good thing about Ansys is its help documentation, where you can get very good information. I would strong recommend you to read through 'how to perform...
Hi rh142,
I am not sure where you got the information from. However, I'd assume you are refering to non-linear analysis without and upgeom consideration. If so, then this is not a buckling problem at all.
Typically in non-linear buckling analysis, an initial linear static analysis is carried...
