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Recent content by patolon

  1. patolon

    Output Vector

    thanks a lot; so now I know that the contour plot has to be interpreted with care especially if the elements have very different orientation. Is it the same for the principal stresses? I guess in that case the orientation of the vector is given by the angle giving no shear. Finally, at a given...
  2. patolon

    Output Vector

    Thanks rb1957. So I have adjacent elements with a different orientation, then how relevant would be the contour plot? Also, when the average of the stresses computed from surrounding nodes is done, it seems that regarding the element orientation, the values picked up would not be the same. So...
  3. patolon

    Output Vector

    Hello, I try to get a better understanding of the meaning of the output vector for stresses in femap, and I'm a bit confused now!! With femap, we can get for a plate element, X normal, Y normal and XY shear stress. So I believe these are the components of the stress tensor. But X and Y are...
  4. patolon

    Gauss Points and accuracy

    AAh the calculated values at the Gauss points give the EXACT value of the integral?!! is it because shape functions are polynomial?
  5. patolon

    Gauss Points and accuracy

    Hello, I think the title is a good summary of the question! During FE process, the stiffness matrix requires integration, and it is approximated at the gauss points. But I wonder how accurate this is. It's a bit strange not to try to calculate the exact value of the integral and instead just...
  6. patolon

    NASTRAN SOL 106 Output

    Thanks for your reply. Well, if I want to know if buckling will occur at 100bar, I have 10 load cases, up to 100 bar. But from the f06 file; there is an ALPHA value for each of the load cases, so it seems like buckling is predicted for each case!! Also, looking at the displacement of the grid...
  7. patolon

    NASTRAN SOL 106 Output

    Hello! I've got a quick question about SOL 106 that I am using for non linear buckling. I've got 10 load cases (10,20,30,40,50,60,70,80,90,100 bar pressure cases), and I would like to predict buckling for that. The output gives me ALPHA values, usually not far from eigenvalues. From this...
  8. patolon

    Load Cases for Non Linear Analysis

    I m using Nastran!
  9. patolon

    Load Cases for Non Linear Analysis

    Hello, Thanks for these replies! Instead of creating a ramp load via the function, what if I create subcases and create multiset in the analysis deck? For example let's say I ve got a 100 bar pressure load. I create 3 load cases, 10, 50 and 100 bar. Then, I have 'none' in the the load in the...
  10. patolon

    Elements Stiffness

    Hello! I'm fairly new to FEA,so I try to get a good sense of the effect of the element type to know which one to choose for an analysis. I cannot really figure out why a TRIA would be stiffer than a QUAD, same for HEX vs TET. So how can I know which is the best option to choose? I guess the...
  11. patolon

    Modelling a bolted interface

    Hello! I think the title is a good summary! I have a region on my design which has a interference fit bush, which I modelled with RBE2. The first question is: is it accurate to model it that way? Secondly, by running a non linear static, would having a RBE2 create inconsistent results? I...
  12. patolon

    Load Cases for Non Linear Analysis

    Hello everybody, I would like to run a non linear static to account for large displacements. The pressure load to apply has a large magnitude so I would like to create a sort of break down by having incremental loading. Is it possible in femap to do that? I guess I can create several load...
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