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  1. TxAg78

    linearized stress question

    You can say that again! Given the maturity of FEA software, and speed of modern computers, I wonder why more don't use nonlinear methods. But not for me to question why. Thanks for the feedback!
  2. TxAg78

    linearized stress question

    TGS4, Thanks for the responses. That's what I thought (that plotting intermediate values of Von Mises is a useless exercise, with no real value when using the BPV code). That said, it's interesting to hear the request justified as "FEA vendor XXX can do it". What can I say? I first learned and...
  3. TxAg78

    linearized stress question

    Prex, Thanks for your comments and the link to the procedure. Yes, that's exactly what I do. I can integrate constant or axisymmetric sections. (There's a flag to request the appropriate integration.) I output all linearized values (for each component, plus combined results at both ends of the...
  4. TxAg78

    linearized stress question

    Background: I have a utility that calculates the linearized stress distribution from FEA results (component by component). It outputs a table at each end end of the SCL that includes: 1) membrane and bending values for each component, 2) vonMises and Tresca (S.I.) calculated from Sm+Sb...
  5. TxAg78

    set surface contact type " Bonded " in patran

    You didn't say which solver (Preference) you are using. Assuming it's Nastran or Marc, you should look create "Glued Contact". Define deformable contact bodies (under Loads), then set as "Glued" in the Contact Table in Analysis setup. Contact Table found under "Subcases", "Subcase Parameters"...
  6. TxAg78

    Element Formulation-Clarify plz

    There are some basic things to know: element type (continuum, shell,plate, membrane, beam, rod, etc). Each is based on some assumptions, just like those in basic mechanics of materials. They work fine if you don't violate the assumed response. Next you should also understand the influence of...
  7. TxAg78

    Unable to access Nastran results

    How long does it take for Patran to tell you if Nastran is complete? If it is almost immediate, or very fast, then Nastran is probably not solving anything. violingineer: That's not a good indication of success/failure with modern hardware. "A simple analysis of a beam" will take seconds to...
  8. TxAg78

    Ansys or. Abaqus?

    You would be remiss not to look at MSC's offerings: Marc and Nastran Implicit Nonlinear solver (aka SOL400). I have used all 4 in my career. Although maybe not Coke vs Pepsi, there's a lot of functionality overlap and preferences vary based on subtle differences. Also, don't forget to consider...
  9. TxAg78

    Suggested best resources / avenues to search for jobs in Houston, TX

    SNORGY, You're correct - some employers do "check folks out" during the hiring process. However, the only things Facebook and LinkedIn have in common are their use as networking sites. LinkedIn is for professionals. You're not going to read "just ate a chocolate donut -- YUMMY!!" on LinkedIn...
  10. TxAg78

    Suggested best resources / avenues to search for jobs in Houston, TX

    You don't have to leave an "electronic footprint that others can follow". Join, add some basic info to your profile , then join a few of the apprporiate engineering groups and read the daily email digests. Some to consider: ASME CAD FEM CFD Engineering + other CAE groups I'm sure there are O&G...
  11. TxAg78

    Suggested best resources / avenues to search for jobs in Houston, TX

    Join LinkedIn, join some groups and build your virtual network. There are plenty of Engineering and FEA related groups. Several have job posts, and recruiters are beating the bushes for O&G engineers. I saw an opening for a riser engineer at $100-180k + starting bonus + relo package. I lived...
  12. TxAg78

    SCL obsolete? (rd 2)

    I originally posted this question in the "ASME (mechanical) Code Issues Forum" under "Engineering Codes, Standards & Certifications" Subject: SCL obsolete? REF: http://www.eng-tips.com/viewthread.cfm?qid=313528 TGS4 provided an excellent response (as always). It didn't get any other feedback...
  13. TxAg78

    ASME vs FEA

    TGS4- Thanks. It's scary, when I used your dimensions above, I get a maximum VonMises stress of 53,706 psi. Way too close to your answer! :) Almost makes me suspicious. So, I'll show my ignorance of torishpherical heads (something new, which intrigued me to begin with). It seems (to this...
  14. TxAg78

    ASME vs FEA

    TGS4, Thanks for running the analysis. I reviewed my quick & dirty (and WRONG) model, and found a dimensional error. However, after correcting, I'm still off (SIGE = 43.6 vs your 53.7 ksi). That's not "close enough" in my book. I ran several reasonable mesh densities, and only see a very...
  15. TxAg78

    Problem with variables in pcl-script

    ...== TRUE ) THEN ui_write ("Test is True") mesh_seed_create( "Curve 1:4", 2, 0, 0., elsize_, 0. ) $? YESFORALL 2001017 END IF END FUNCTION /* eng_tips_test */ Save this snippet as eng_tips_test.pcl You run this by entering this on Patran's command line: !! INPUT eng_tips_test.pcl...
  16. TxAg78

    SCL obsolete?

    TGS4- Thanks for the clarification. I assume by "nonlinear geometry" you mean "large deformation/strain" (and "linear" == "small"). I see why you prefer Elastic-Plastic. From a FEA standpoint, these are pratically the same. By that I mean an industrial strengh nonlinear solver should be able...
  17. TxAg78

    ASME vs FEA

    rmerlob- Something's still bothering me about your FEA model. Like TGS4, please, please don't tell me those are linear tet elements (eg tet/4). Generally when a mesh is too course (either due to mesh density or element type), the structure is too stiff, and the displacements and stresses are...
  18. TxAg78

    SCL obsolete?

    TGS4, Thanks for the feedback. I kinda figured that's what you'd say (based on previous posts). :) I guess I'm a little confused by your nonlinear comments. I had the impression that load limit and elastic plastic were the same. Apparently not. :( Is there a short explanation of the...
  19. TxAg78

    ASME vs FEA

    rmerlob- The calculations in your spreadsheet look correct to me. I added another equation to calculate the required thickness for the 250 psi pressure. The result is t=0.3149. That's a good sign. :) After looking at the images of your Inventor results (and reading the other forum thread)...
  20. TxAg78

    SCL obsolete?

    I've been away from ASME certification for "a few years". Things have certainly changed with the 2007 code! After reviewing related threads in this forum, I'm wondering what's the common practice for applying FEA in design by analysis Section III and Section VIII, Division 2. There are...

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