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  1. Hesy33

    4 point bending test in Femap

    I did try with symmetry on just plane (along the width). I am not able to stabilize the model. I get the dreaded 9137. How can I stabillize the model? The rollers are constrained to move in the vertical direction and the bottom roller it fixed in place.
  2. Hesy33

    4 point bending test in Femap

    Just another follow up question here, I have never worked with symmetric models before. The model I shared for example, has a von mises of ~170 MPa. But according Mý/I,it should show ~330 MPa. Should I double the stress results? Why is the FEA results different? Am I missing something...
  3. Hesy33

    4 point bending test in Femap

    @karachun, I modelled a rectangular beam with frictionless contact. How can I model a remote force with an RBE element? MOdel attached @rb1957, The hand calc was done with Hook'es law. However from the experiments my cermaic composite does not agree with Hooke's law in the linear range...
  4. Hesy33

    4 point bending test in Femap

    Yes, the FE material input is correct. I did a quick hand calc and I see a max stress of 25 MPa. I have 40 MPa in Femap. The material should not have fractured at this level. What could be the reasons?
  5. Hesy33

    4 point bending test in Femap

    @rb1957 Thanks for the response. I understand that the stress is not material dependent. Yes, I am expecting a strss range of 300 MPa which is the flexure strength of the material. The Area Inertis is tough to calcuate given the complicated cross section. Is there a way I can take it out of...
  6. Hesy33

    4 point bending test in Femap

    @karachun Thanks for the reply. How did you calculate the enforced displacement which corresponds to the load applied in the testing machine?
  7. Hesy33

    4 point bending test in Femap

  8. Hesy33

    4 point bending test in Femap

    It is not a simple beam I am testing, it has a cells inside (cross section as shown). @rb1957 , it failed under bending. It is a ceramic composite and hence brittle. @karachun, The contact is a fritcional contact. In the FE model, have you constrained the rollers to displace only in ther...
  9. Hesy33

    4 point bending test in Femap

    Hi all, Note: I have read through many posts before posting here as I was not able to find a convincing answer. My first post but a long time follower. :) So please be kind If am using the wrong forum to post this. I am trying to model a 4- point bending test of a ceramic composite. But...

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