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  • Users: marulanda
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  1. marulanda

    import *.op2 or *.xdb

    Hello guys, I've to import 15 *.op2 files in a patran db. Is there some way to import all of them automatically (no, one by one). Thanks.
  2. marulanda

    sol 700, deactive shell element

    Hello, I need to deactive some shell elemets in an impact simulation when a critical value of strain or stress is achived. In particularl I used card MATM for a PFA of a plate in coposite material in qrg is written thet it have to be activate the DEACT flag for the plys to deactive the element...
  3. marulanda

    bush or bar element, which is more conservative or accurated and why?

    As the title I'would like to know which is more conservative or accurated and why? Considering bush or bar elemnt to simulate a fastener. Regards
  4. marulanda

    Sol 400 RBE3 with quadratic elemnts (ex. TET10).

    Someone told me that to use a middle nodes (for quadratic element ex. TET10) as master in an RBE3 is non recommendable, especially in a sol 400 non-linear-static analysis, the solution might not converge. Is it true and why??? Thanks Best regards.
  5. marulanda

    Alodine 1200

    I'm not an expert of corrosion, so I've some question about this surface treatment: I would like to use Alodine 1200 to protect an aluminium alloy (6082-T6) structure that cannot present corrosion for the first 5-6 years of its life. The structure is located in urban environment, Is a good...
  6. marulanda

    Problem with contact, sol101

    Hi I've a problem with a model of an assy, with a contact definition in Nastran. I've six couple of surfaces, four of them are in touch before and after the run with loads. The other two couples have a small gap (0.5 mm) before the run and Their touching after the run. I've applied a sol 101...
  7. marulanda

    Not apply bolt preload, is it conservative?

    Hi, I've a question for you. Is in FEM static analysis conservative not to apply a preload on the bolts? I have heard many different opinions on this argument, so now I have confused ideas. Someone can help me, please. Regards.
  8. marulanda

    Fatigue analysis maxi principal stress

    HI, I'm Alfonso. I need explanation on a fatigue analysis using Max principal method. I've applied 8 fatigue load condition on a fem model, with a static analysis. I've found the critical location on the model, and allowable delta sigma from en-1993.1.9 . Now I've 8 max pirncipal and 8 min...
  9. marulanda

    Evaluate bolt preload

    Hi, I need help with bolt preload design. It's a simple problem, but I don't have experience with this argument. I've two plates joined with two M5, plates are s235 fy=235MPa steel thk 3mm and 2mm, bolt 8.8 fy=600Mpa. The design preload of the bolt is 6300 N, evaluated with meccanical property...
  10. marulanda

    Bolt preload sol400

    Hi, for the first time I have to simulate a structure which have bolts preloaded. I Have to join two plates (2mm and 3mm steel fyp=235 MPa) with two M5. I've used Cbar as bolt shank and RBE3 to link the bolt to plates (I've tested rbe3 also). I used a sol400 plus BCTABLE for the contact between...
  11. marulanda

    MPC (RBE2, RBE3) sol400 NASTRAN multi step analysis

    Hi I'm an aeronautical engineer who work as stress analyst. I've a problem with a non linear multi step analysis sol400 Nastran. I've two non-linear steps, in the first there are preloaded bolts and some surface with friction. In the second I added an inertial load. There is a lamped mass which...

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