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  • Users: jacksonfem
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  1. jacksonfem

    PLOAD4 on QUAD with Cylidrical Coordinate system problem

    On a QUAD 1x1, pinned at all nodes ( see the image ), I apply a constant pressure-traction (PLOAD4) at x-direction, with a magnitude of 10. The Tx reactions on each support is 2.5 as expected. Total X force = 10*1*1=10. Each support takes 10/4=2.5. I create a Cylindrical Coordinate System...
  2. jacksonfem

    FEM Analyst or Developer?

    I have the oppurtunity to work for a company that develops a Finite Element Solver. I must choose between the next two: 1) Programming of FEM method etc, with C, C#. 2) Performing analyses to check if the solver works properly. I have worked as a structural engineer, 10 years now, where I have...
  3. jacksonfem

    SOL 400 contact problem, where in SOL 601 is OK

    Hello, I have a model with solid elements, simulating a clip, as you can see in the image below. In SOL 601, with NxNastran, I can easily simulate the male clip moving out from the female and in again with a transient analysis, as you can see in the images sequence. But when I try to perform...
  4. jacksonfem

    SOL 701 - Problematic Behaviour of Ruptured Elements

    I tried many to times to run an Explicit analysis, but I think Femap doesn 't behave as it should, or better, as other Explicit solvers do. Like LS-Dyna or Abaqus. I tried to do something like this http://www.dynaexamples.com/intro-by-j.-reid/symtube (select the animated result to see it...
  5. jacksonfem

    SOL 601 - Strange Non-convergence in Non-Linear Contact Problem

    Hi everybody! I 'm trying to perform a contact analysis. As you can see in pics 1 and 2, I 'm trying to pass the ball through the 2 plates. I do the followings: 1) Plates and ball from shell elements 2) Displacement assigned on ball, not force. 3) SOL 601 Non-linear static, not transient 4) ATS...
  6. jacksonfem

    SOL 601 - Strange Non-convergence in Non-Linear Contact Problem

    Hi everybody! I 'm trying to perform a contact analysis. As you can see in pics 1 and 2, I 'm trying to pass the ball through the 2 plates. I do the followings: 1) Plates and ball from shell elements 2) Displacement assigned on ball, not force. 3) SOL 601 Non-linear static, not transient 4) ATS...
  7. jacksonfem

    FEA Software Testing Engineer - Opinions

    Hi everybody! I 'm a civil (structural) engineer. I have an oppurtinity to work for a company which develops a FEA software (pre/post processor and solver), as a Software Testing Engineer. I 've read many things for this job in the internet, but nothing had to do with a FEA software. All the...
  8. jacksonfem

    Buckling analysis problem - very strange...

    Hi, I 'm working for years Femap, since 9.3 version and I didn 't ever faced such a problem. On Femap 11.0.1, I perform a buckling analysis to a compressed steel member (HEB 240), just to give geometric imperfection from the first buckling mode, as I always do. For example, for a compressed...
  9. jacksonfem

    STEEL CONNECTIONS MODELLING

    Hi everybody! I want to model many steel connections in Femap, but every connection needs a lot of time to design it (Bolts, endplates, holes etc). Does anyone knows, if there is a design program, that you can model easy any connection you want, and then export it as a 3D Solid model, so that...
  10. jacksonfem

    "Edge-to-Surface" glue contact in SOL601???

    Does the SOL601 support the Edge to Surface glue contact? When I perform a static analysis it 's working fine, but when I perform an advanced nonlinear static (601) it doesn 't work...
  11. jacksonfem

    Bulk Data Parameter Entries - Rayleigh Damping Alpha1 and Alpha2

    I would like to import Rayleigh Damping for Advanced Nonlinear Transient (SOL601). My steps are: - In the "Analysis Set Manager", I press "Preview Input" and then I click "Edit Preview" - At the exististing PARAM commands I write for example "PARAM,ALPHA1,0.5" - Click on "Analyze" and I take...
  12. jacksonfem

    How Femap works with other solvers (Ansys, Abaqus etc)?

    How I can run an analysis with Femap, using other solver than NxNastran?. For example with Ansys solver...
  13. jacksonfem

    RUPTURE ELEMENT ANALYSIS

    How we perform a rupture analysis? I set a bi-linear stress-strain curve, nonlinear material, large displacements-large strain etc, but the analysis always stop. Can someone give me some advices on how I can achieve that? Thanks.
  14. jacksonfem

    Problem with Time History Analysis - Direct and Modal Transient with N

    Hi! I perform a simple time history analysis with Femap-NxNastran. One time with Direct Transient and one with Modal Transient. When I perform the Modal Transient the Animation is wrong and very weird...I can 't understand why is this... Just check the 2 attached videos. Thanks
  15. jacksonfem

    Damping at DEFINE MATERIAL tab

    When I give damping to a material from define material tab (2c/co), I don' t see any change at the response of the model. How it is activated? Thanks
  16. jacksonfem

    Damping in Advanced Nonlinear Transient Impact Analysis?

    Hi everybody! I perform an anvanced nonlinear transient analysis with contact elements. How I give damping to elements? For example I want to force a ball by gravity and throw it to the floor. Well, I can do it, but without damping. How I do it? Also how I can give different damping to the ball...
  17. jacksonfem

    Damping at DEFINE MATERIAL tab

    When I give damping to a material from define material tab (2c/co), I don' t see any change at the response of the model. How it is activated? Thanks
  18. jacksonfem

    How I create Damping in Advanced Nonlinear Transient Analysis?

    Hi everybody! I perform an anvanced nonlinear transient analysis with contact elements. How I give damping to elements? For example I want to force a ball by gravity and throw it to the floor. Well, I can do it, but without damping. How I do it? Also how I can give different damping to the ball...

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