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  1. A_aerospace

    Fuselage Hoop Stress Calculation

    Your equation (P * r / t) is valid only for constant radius. Using local radius is not correct IMHO. To be certain about that just imagine there is a flat spot in the section (r=0). How does this formula work in this case?
  2. A_aerospace

    No stress results in part model with gaps and nonlinear static

    "why click "NO" if solution non linear" If you click “Yes” femap reads ONLY Nonlinear results. If you click “No” femap reads All results (both Linear and Nonlinear)
  3. A_aerospace

    Titanium fastener in tension fitting

    WKTaylor, NAS9921 is shear type bolt? It says “SHEAR… SHORT THREAD”. Is it suitable for high tension load? Or in other words: what Ti bolt works well in tension?
  4. A_aerospace

    Titanium fastener in tension fitting

    Good point. Bolt preload definitely helps. Probably it would look more like this (exaggerated of course):
  5. A_aerospace

    Titanium fastener in tension fitting

    Thank you guys for comprehensive comments. “fatigue life of the mating parts”- It was checked. Results are Ok. “Have they run this analysis with both materials and compared the results” – No. “You say you are considering steel fasteners instead. What type?” - If it were for me, I would...
  6. A_aerospace

    Titanium fastener in tension fitting

    I don’t have absolutely strong arguments otherwise this post would not exist. Of course the first thing that anybody would look at is static and fatigue analysis. That’s why I mentioned them immediately in the first comment. I am looking for pros and cons beyond those two. Here is my humble...
  7. A_aerospace

    Titanium fastener in tension fitting

    Thanks for your reply. Just to be sure that I am clear enough and we are talking about the same thing. My question is only about the tension bolt in that fitting (see picture below).
  8. A_aerospace

    Titanium fastener in tension fitting

    Hi all, In one fuselage design of a transport aircraft I saw titanium hi-loks DAN7 in classical channel tension fitting. Fitting connects two parts of a beam and the beam itself is a longitudinal sill over fuselage door cut-out. Primary structure. Usually (to my experience) steel fasteners are...
  9. A_aerospace

    No stress results in part model with gaps and nonlinear static

    When Femap asks "OK to Read Nonlinear Stresses and Strains?", clik "NO".
  10. A_aerospace

    Extract the stress value

    If I understand correctly, you want to extract them to text file. See attached picture.

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