Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations JAE on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. FireflySpace

    6066 Laminate Min SR

    Hello ~ Does anyone have a snap shot or a document you could refer me to for understanding how Nastran is computing the output vector "6066 - Laminate Min Strength Ratio" for a 2D orthotropic laminate? Best, Jared
  2. FireflySpace

    ASTM Spread-Sheets

    I was just curious if anyone had already built and is will to share their spread-sheets for digesting raw test data executed under a specific ASTM #? Best, Jared
  3. FireflySpace

    Nastran V9 Negative Diagonal Ratio

    Hi Blas, I apologies not getting back to you sooner, always many fires to put out. This is some great feedback, and I had a strong gut feeling telling me this was the incorrect solver to be using for these contact nonlinear high strain / displacements FEM models. Unfortunately we do not have...
  4. FireflySpace

    Nastran V9 Negative Diagonal Ratio

    Zip File Attachedhttp://files.engineering.com/getfile.aspx?folder=006b84f2-783f-4b6a-9521-8886e7c850ea&file=Prop_Tank_S2.zip
  5. FireflySpace

    Nastran V9 Negative Diagonal Ratio

    Hi Blas Molero, I appreciate your feed-back, I uploaded the results file... Anyways it seems to be a repeated problem with multiple models I've created. I'm going to try a few different approaches this week to minimize the contact elements. Best, Jared
  6. FireflySpace

    Nastran V9 Negative Diagonal Ratio

    Yes I did, I ran SOL101 and SOL103, reviewed the model and everything seems to be in working order. I think the problem is the isotropic boss stiffness relative to the shell elements, the all-composite liner puts a larger bending stress at the boss root, and I think the model is having a hard...
  7. FireflySpace

    Nastran V9 Negative Diagonal Ratio

    Hello Everyone, I've read thru some great responses regarding troubleshooting negative diagonal ratios & excessively large MAXRATIO, I was hoping we could take a look at my current f06 output and get some constructive feedback. The general model: 1.) All composite pressure vessel 2.) Liner is...

Part and Inventory Search

Back
Top