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Recent content by janipk

  1. janipk

    HIGH MATRIX/FACTOR DIAGONAL RATIO

    Hi, I have already used K6ROT parameter to control the R1 but I have problem with R2 and R3. regards,
  2. janipk

    HIGH MATRIX/FACTOR DIAGONAL RATIO

    Hello to everyone, I am running a nonlinear analysis on Nastran using CBEAM as rivets and CGAP elements and have very high (10E+9) or negative MATRIX/FACTOR DIAGONAL RATIOs(high rotations at nodes) at the nodes of CBEAM elements. Does anyone know how control the high rotations on these noeds...
  3. janipk

    GAP elements

    Hi to everyone, Thank you very very much Onda for your help! I have done every thing like in given bdf file and now an example model is working but my actaul model( Fuselage part of A350) with 455699 dof is sitll not working. In reality I have a gap of 3.5 mm between two shells,even I have...
  4. janipk

    GAP elements

    Hi Onda, Thanks! I have tried everything but in vain. Anyhow waiting for your your example model modeled in cylindrical coordinate system. Regards, JOnn
  5. janipk

    GAP elements

    Hi, Thanks Onda for your information! I have non-coincident nodes and there is gap of 3.649902 e.g $gap between grid 331869 dof 1 and grid 460605 dof 1 init opening = 3.649902 SPOINT 4611352 4611353 SUPORT 4611352 0 SPC 101106 4611353 0 3.649902 MPC 101106 460605 1 1...
  6. janipk

    GAP elements

    Hi to everyone, thanks to Onda! I have modeled the gap elements and have strange results. Actully I have a cylinderical shape model having some parts inside which have contact with the cylinderical part. I modeled the linear gap elements between them. I have pressure acting in the radial...
  7. janipk

    GAP elements

    Hello to everyone, Could anyone give me some information about 1-D GAP elements i.e what they do? how can be modeled? Are they can be used in linear calculations also? Thanks
  8. janipk

    Error when using SOL 200

    Hello to everyone, Could anyone give me some information about 1-D GAP elements i.e what they do? how can be modeled? Are they can be used in linear calculations also? Thanks
  9. janipk

    Composite material modeling

    Hi to all, Thanks to all of you for kind remarks
  10. janipk

    Composite material modeling

    Hi rstupplebeen, Thanks a lot man! Wish you a nice evening. janipk
  11. janipk

    Composite material modeling

    Hi RPstress, I am sorry to say that all the stuff you have said is already known to me also. I think, I could not make my question very clear. 1. 6-6-6-6 means: 6-pleis at 45°, 6-plies at -45°, 6-plies at 90° and 6-plies at 0° are oriented. 2.My question was about the (45°,-45°,90°, 0°|3S)...
  12. janipk

    Composite material modeling

    I am new to composite engineering and wanted to model a composite material with following information: Ply thickness= 0.127 mm 6-6-6-6 Layup(+45, -45, 90, 0|S) here 'S' stands for symmetry. I am using MSC Patran for modeling and Nastran for analysis. Could anyone help me how to fill this...
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