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  • Users: xerf
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  1. xerf

    CSLIP Confusion

    I think CDISP has 3 components (for 3D), 1 = COPEN , 2= CSLIP1, 3=CSLIP2. (Array indexing starts from 1 in FORTRAN).
  2. xerf

    How do i avoid penetration between two contact surfaces in ABAQUS?

    Penalty method for enforcing contact allows for penetrations. You need to use the direct enforcement if want to see no penetration.
  3. xerf

    Abaqus vs Ansys

    I believe Abaqus recently launched their own CFD code. http://www.simulia.com/products/abaqus_cfd.html http://www.simulia.com/products/abaqus_multiphysics.html
  4. xerf

    Output Variable for Displacement?

    You can use Abaqus/CAE -> Visualization to create a new node field from U(step2)-U(step1) and plot it as any other quantity.
  5. xerf

    using Abaqus python from ABAQUS command line

    Are you running the script inside /CAE ? Abaqus Python scripts are not supposed to be run with the public Python distribution. Abaqus comes with its own Python compiler version which includes additional modules.
  6. xerf

    How to display pre-processor printout?

    Look in the .dat file.
  7. xerf

    problems with beam normals

    I might be wrong but I think your confusion relates to the following: Abaqus consists of 3 main -standalone- programs: Abaqus/CAE - pre/post processor (for creating models - more like a CAD software with meshing capabilities and for visualizing results.) Abaqus/Standard - implicit analysis code...
  8. xerf

    How to use a UMAT

    The User Subroutines Reference Manual has a section on printing messages to the message or status file. for example: write(6,*) 'test' will print 'test' in the .dat file write(7,*) 'test' will print 'test' in the .msg file etc.
  9. xerf

    problems with beam normals

    I suspect the issue mentioned in the paragraph you cited is the default normal averaging at nodes. I think Abaqus tries to (automatically) establish the normal at nodes by using the orientation of beam elements specified by the user and in certain cases it does some averaging....
  10. xerf

    Applying load in abaqus

    I suspect you can use *DSLOAD with a an ORIENTATION to define the components of a traction vector load. Some points: - pressure acts always normal to the surface - if you have a traction acting at an angle it can be decomposed in a normal component and a shear component.
  11. xerf

    rotation BC on rigid body in moving CSYS

    Assuming the cylindrical roll is a rigid body, then it has 6 DOFS 3 translations and 3 rotations at a reference node. You can try to use the DISP user subroutine to prescribe these DOFS as you like.
  12. xerf

    How to model analytical rigid surfaces

    You cannot mesh analytical rigid surfaces, only discrete rigid surfaces can be meshed. For each rigid surface you need to define a single reference point which can be used for applying loads/displacements. Typically the rigid parts interacts with other parts via contact interactions.
  13. xerf

    How to model a steel cable in Abaqus?

    I think it might be possible using the old slide line or tube to tube contact elements. I do not remember the details. You should search the Abaqus documentation for *SLIDE LINE, slide line contact elements, tube-to-tube, *INTERFACE etc.
  14. xerf

    Creating finite elements individually in CAE

    As an workaround, you can import the .inp file in /CAE. It will create an orphan mesh part defined in terms of elements and nodes.
  15. xerf

    Poroelastic material using CAE

    I suspect you need to use *INITIAL CONDITIONS, TYPE=RATIO (to provide initial void ratio for a coupled pore-fluid diffusion/stress analysis). (this is similar to providing an initial temperature field for a heat transfer problem.)
  16. xerf

    Modelling nano scale in Abaqus

    In my opinion, continuum FE formulations are not very useful at nano-scale. However, if you are interested in modeling inter-atomic interactions using user-defined "structural-like" elements you might be interested in the user subroutine UEL. I think currently researchers are interested in...
  17. xerf

    CPRESS in ABAQUS

    There is some information in the Theory Manual. It is based on the Lagrange multipliers (LM) used to enforce the contact constraints. According to Analysis User's manual, Abaqus may do some further processing of LM (perhaps some averaging of the values provided by individual constraints) before...
  18. xerf

    Error Code 253

    Some recommendations: 1) try to replace your UMAT with a simple built-in material and see if the abort still occurs, if yes contact Abaqus support again. 2)use the model with a simple UMAT, from documentation 3)use your UMAT with a small model and put printout statements to .msg file (unit 7)...
  19. xerf

    Visualize random fields

    1) You can use UMAT and store them in state variables (STATEV). State variables are available for plotting as SDV. Perhaps you might not even need UMAT but only SDVINI which is called at the beginning of the analysis to initialize the state variables. 2)If the materials properties are only...
  20. xerf

    PC locks up running large jobs

    Does this happen with a particular model or with any model ? Do you get any error message in .log / .msg about abort? Running jobs with 3 cores is kind of unusual. Does is run with 2 cores? Does the HD undergo automatic back-up?

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