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  1. Yunus9696

    2D-Axisymmetric equivalent boundary conditions of a real 3D problem

    Dear colleagues Hope you're fine. I'm modeling a 2D-Axisymmetric model of a dental implant in the jawbone. I need to know if the applied boundary conditions are reasonable? I have only constrained the boundary of the cortical bone in the vertical and rotational (about the axis of rotation)...
  2. Yunus9696

    Anisotropic material properties in a 2D axisymmetric model

    Thanks dear FEA way for the great tips.
  3. Yunus9696

    Anisotropic material properties in a 2D axisymmetric model

    Thanks FEA way for reply Given that we have orthotropic material properties in x y z directions, how can we enter them in an axisymmetric model with elements that include twist(eg. CGAX4) ? Also how can we test and check wether the material properties are properly entered and the model is...
  4. Yunus9696

    Anisotropic material properties in a 2D axisymmetric model

    Hello everyone I'm trying to model a threaded connection by a 2D axisymmetric model. I need to use anisotropic material properties for a part in this model. Is it applicable to assign anisotropic material properties to a 2D axisymmetric model. If yes, how this can be done? Best, Yunus.
  5. Yunus9696

    Negative coordinate values error in 2D axisymmetric analysis

    Thanks dear FEA way for your kind attention. I'll check the mentioned instruction and share the results for future reference.
  6. Yunus9696

    Negative coordinate values error in 2D axisymmetric analysis

    Dear colleagues Hope you're fine. I'm trying to model a threaded connection with a 2D axisymmetric model.I need to make several models with slight changes and differences. When submitting some models for analysis they get aborted due to some nodes have Negative coordinate values error. When I...
  7. Yunus9696

    How to call solution dependent state variables in UMAT subroutine?

    To whom it may concern In UMAT subroutine, despite of USDFLD subroutine, you don't need a utility routine like GETVRM to call STATEVs, You can directly define and call them in your code since they are passed in to UMAT ant the beginning of the increment. for example: subroutine...
  8. Yunus9696

    How to call solution dependent state variables in UMAT subroutine?

    Dear colleagues I wonder how I can call and use STATEVs of previous increment(s) in UMAT subroutine? Thanks in advance. PS: I know that in USDFLD subroutine you can use GETVRM utility routine to access STATEVs and any other material point variable but in UMAT this utility routine can't be called.
  9. Yunus9696

    Averaging a field output in last 10 increments

    Dear FEA way thanks for your reply. Time averaging. I have tried the following solutions but still none of them worked out: 1. Using Solution dependent state variables (SDVs) ====> the problem is that the dimensions of the SDV arrays and how to work with them is not clear, for example: In...
  10. Yunus9696

    Averaging a field output in last 10 increments

    Hello dear colleagues hope you're fine. I wonder if there is a way to average a field output (eg. Von mises stress) in last 10 increments for each element using: a. Abaqus subroutines b. Abaqus python scripting c. any other way Thanks in advance, Yunus. PS: I'm using the USDFLD subroutine...
  11. Yunus9696

    2 questions on USDFLD subroutine

    Hello everyone Hope you are fine. I have 2 questions about USDFLD: 1. In case I have 3 Materials (3 Field variables) and I am using USDFLD in the 4th step, by which Material the analysis gets done in 3 previous steps? In another words, before USDFLD starts working, which material is used? 2...
  12. Yunus9696

    Moment and Friction problem

    Yes, this model seems to be beneficial for future reference for who wants to model a screw in 2 or 3D. Here I kindly attached the model files. can't wait for your great tips, Regards, Yunus...
  13. Yunus9696

    Moment and Friction problem

    Hello again I tried the 1rst and 2nd method and I found the root of convergence problem. As you kindly mentioned, there is a gap between two parts,however not at the beginnig of the step but once the moment is applied. The moment along Pin's axis seems to shrink it in radial direction and there...
  14. Yunus9696

    Moment and Friction problem

    Thanks dear FEA way for your complete response and various methods to tackle this problem : 1. Displacement control load to establish contact 2. Automatic stabilization 3. Dynamic quasi-static step 4. Discrete dashpots I should do a search about last three ones, but about the first one, you...
  15. Yunus9696

    Moment and Friction problem

    About the gaps I'm sure that there isn't since the inner diameter of the box is exactly equal to the outer diameter of the pin, and it can be checked visually. But if I don't use force control (ie. the 0.2 N.m moment), then how can I apply the exact 0.2 N.m torque on the pin? I'd also...
  16. Yunus9696

    Moment and Friction problem

    Dear FEA way Thanks for your reply In the initial step, I defined the contact with frictionless behavior and encastre boundary condition for the box bottom. In the first step, I hold the boundary conditions and change the contact behavior to penalty=0.8 In the second step, which doesn't...
  17. Yunus9696

    Moment and Friction problem

    Dear coleagues Hope you're fine. I have two cylinders. The outer surface of the smaller cylinder (lets call it Pin) is in contact to the inner surface of the larger one(lets call it Box). The contact type is surface-to-surface and by a friction coeficient of 0.8 (tangentioal behavior>>penalty...
  18. Yunus9696

    Averaging a variable value in 3 increments (Abaqus subroutines question)

    Dear FE way Thanks for your reply. I tried to know how to get benefit from STATVs to have access to the previous increments results but the STATVs seem to work only in the current increment. I ran a model consists of only one element and one integration point (CPS4R shell element) for only 3...
  19. Yunus9696

    Averaging a variable value in 3 increments (Abaqus subroutines question)

    Dear colleagues Hope you're great. Using USDFLD subroutine, I want to choose material properties for the new increment based on the average of a variable (eg. S11) in last 3 increments. Do you have any idea that how can I do so? For example, how can I call the value of S11 in previous...
  20. Yunus9696

    Abaqus different variables' components order

    Dear colleagues Hope you're fine Using USDFLD subroutine, how one can be sure which component of the desired variable is he/she using? For example we know that 1,2,3...6 components of Stress would refer to S11,S22,S33,....S23 but what about other variables (eg. FLVEL Current magnitude and...

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