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  1. Mechaero2006

    Contact boundaries and stress results averaging

    Further investigation showed that the problem described above was evident only when the model was subjected to a pure tensile load (single point force). There was no significant difference in stress results between discrete and analytical contact in other loading conditions (such as bending)...
  2. Mechaero2006

    Contact boundaries and stress results (MSC MARC)

    I am sorry for the double post but I've seen that the msc software: marc forum doesn't receive any attention. Could you please have a look in the following question of mine? https://www.eng-tips.com/viewthread.cfm?qid=459720 Thank you.
  3. Mechaero2006

    Contact boundaries and stress results averaging

    Dear all, I recently completed successfully a 3d connection problem where two steel plates are connected with a bolt and subjected to tension/bending. The question arises from the observation that the element stress results through the "extrapolation" option need to be "averaged" or remain...
  4. Mechaero2006

    FEA with wire rope

    Have a look here: http://enu.kz/repository/2010/AIAA-2010-2607.pdf They used MSC NASTRAN sol 106 which is non-linear static, however I would suggest MARC from the same company which is their "standard" implicit non-linear solver.
  5. Mechaero2006

    shear flow?

    Found it I think... It was a mistake with the area where the load derived from q was applied. More info soon... Thank you rb1957 for your interest.
  6. Mechaero2006

    shear flow?

    Dear rb1957, first let me apologize for taking so many days to reply. I hadn't checked this thread and to be honest I didn't expect any follow ups. Anyway, let me briefly update: In terms of loads application, I decided to apply these wierd looking loads at point 1 as pressure loads (forces...
  7. Mechaero2006

    Constraint or Internal Forces?

    Answering to myself, after visualizing my results with freebody option using the same post-processor: Freebody loads = -Sum(Element forces).
  8. Mechaero2006

    Constraint or Internal Forces?

    Thank you (one more time!) In both cases the resulting forces (constraint and internal) are analysed and displayed in their respective components (x,y,z). Accordingly, the resultant force can be seen. Do you agree with my thought that the constraint forces results will be used or is it the...
  9. Mechaero2006

    Constraint or Internal Forces?

    This might sound trivial but I really want to ask: A beam is modelled with 1d elements, appropriate constraints are placed on two points and a load is applied on one end. Simulation is successfull and now the question: If one wants to use the fea calculated forces on the constraints in order...
  10. Mechaero2006

    shear flow?

    Dear rb1957, I really appreciate your interest. Yes, I have to agree that this load on point 1 is "strange" and my experience doesn't allow me to think other ways to apply it on the structure. What I have shown in terms of loads in the original file attached, comes from a report where some...
  11. Mechaero2006

    shear flow?

    Hello rb1957, apologies for not replying sooner. Thank you for your last remark. As to my progress with this problem, I have created a number of successful runs, but I am having some serious thoughts about: a) My boundary conditions at the bottom of the part (constraints all over the bottom...
  12. Mechaero2006

    shear flow?

    Hello rb1957, Sometimes the urge to over describe a problem makes you write "essays" instead of being precise. I promise that next time I'll be more spartan in my problem definitions. So: Correct. Couldn't say it better myself (as proved!) That's what I've already done. Well, that was my...
  13. Mechaero2006

    shear flow?

    Dear rb1957, thank you for your reply. I think you're right, I should have paid more attention to what I want to do and then write my question. So let me try to explain: the term "fictitious" for the loads, describes the values of the shear flow shown in the attachment. I meant that these are...
  14. Mechaero2006

    Application of shear flow load in PATRAN?

    Hello all, could you please have a look on the following thread (accidentally posted in FEA) and give your replies here? http://www.eng-tips.com/viewthread.cfm?qid=408400 Thank you in advance for your assistance.
  15. Mechaero2006

    shear flow?

    The following post is relevant: http://www.eng-tips.com/viewthread.cfm?qid=355927 Note: A link of the present thread to the more appropriate: /simulation/MSC.Software: Patran Forum will be made.
  16. Mechaero2006

    shear flow?

    Dear all, in the file attached you will see a simple drawing of a part I want to model. The question is about the recommended process to model the boundary conditions and especially the shear flow seen. As stated in the file, everything is known (forces, moments at points 1 and 2), section...
  17. Mechaero2006

    Some ideas? No actual code needed...

    IRstuff, I do not disagree with you. Your code is fine if you want a step size for i,j of one (or an integer). But what if you want to go from 0 to 40 with a step size of say 0.5? Based on the above conversation (even with my "blurry" description of the problem) I have a clear view of what to...
  18. Mechaero2006

    Some ideas? No actual code needed...

    Hi IRstuff, No, this is absolutely NOT a school/university/college etc. project. I am a just self learner. Nothing more, nothing less. The problem I am studying has an initial condition for u (or whatever you call it) depending on x,y values. Thus, I am filling it with zeros and then based on...
  19. Mechaero2006

    Some ideas? No actual code needed...

    I promised "no coding..." (as per original title) however I couldn't resist the temptation... Here is something easy for you: Since my x (or y) values have an non integer step for the do loop and this is not always acceptable, I have used the following code to fill my x values (aka DO-WHILE...
  20. Mechaero2006

    Some ideas? No actual code needed...

    Thank you very much for taking the time to reply to my question. Yes, you are very right, my logic was wrong and I though about it a few hours after writing the question, however I didn't rectify it (my bad!) to assit you. So a big thanks to you all for pointing out my mistake and sorry for the...

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