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  1. Vishakh_Rajendran

    ABAQUS error - 'Node set assembly_left_rp' has not been defined

    Hello, In your case, you are applying a loading on a reference point. A reference point is used to locate or mark the position. It is not attached to the model / geometry by default. This is why we see the error message – ‘ THIS NODE SET IS NOT ACTIVE IN THE MODEL ‘. Try connecting the RP to...
  2. Vishakh_Rajendran

    What is XFEM

    Put in a very simple way, XFEM is the art of an element saying to the Solver - 'LOOK, I AM NOT LIKE OTHERS, HANDLE ME WITH CARE'. In an ABAQUS model, try plotting Displacement ('U') contours in the model. The contour lines will be smooth and continous. In an undamaged material, displacement is...
  3. Vishakh_Rajendran

    XFEM 'Mapping' error

    Hello Mr. FEA way, thank you for the reply. No, the Stress Intensity Factor results are very bad and there is no convergence (meaning there are great oscialltions between the SIF predicted by the contours 3,4 and 5).
  4. Vishakh_Rajendran

    XFEM 'Mapping' error

    Hello Mr. FEA way, thank you for the reply. My crack is not aligned with any of the element edges. Please see the image attached. As per the thread you mentioned, the crack should not be aligned with the element edges. Even with my case as well, the crack is not aligned with the element...
  5. Vishakh_Rajendran

    XFEM 'Mapping' error

    Hello all, Could you please explain the meaning of the following warning message - 'Mapping of the generated node XYZ to the closest model element ABC is not successful -- the nodel iso-coordinates are ...'. This warning is seen in an XFEM analysis. Thank you in advance, Vishakh.
  6. Vishakh_Rajendran

    Crack Initiation Criterion for orthotropic materials

    Thank you very much for the response. But, are you aware of any law which can be implemented through the subroutine for this scenario?
  7. Vishakh_Rajendran

    Purpose of Reaction Force in ABAQUS

    Hello, The answer to this is pretty simple. Let us assume you have a demo cube (solid element). Let us pin one side of the cube (U1 = U2 = U3 = 0) and let us apply a tensile loading on the other side (U1 = U2 = 0 and U3 = say 1) (See the attachments). Let me create a Reference point and let...
  8. Vishakh_Rajendran

    Crack Initiation Criterion for orthotropic materials

    Hello, I am trying to find out the 'Crack initiation Criterion' which is available as an history output in an ABAQUS contour integral simulation. But the prediction of this 'Crack initiation Criterion' using the three conditions of 1. MTS, 2. MERR and 3. K2 = 0 works only for Isotropic...
  9. Vishakh_Rajendran

    Convergence of SIF results for a Composite

    Hello, Thank you for the reply. There is no negative eigen values in my case. Thank you for sharing the documentation chapter. I was working with a demo model and ofcourse, I seem to have made a very bad choice of the material properties. Thank you.
  10. Vishakh_Rajendran

    Convergence of SIF results for a Composite

    Thanks very much. It just seems to be a very bad choice of the material properties in the transverse directions which made the stiffness matrix non-positive definite (maybe). With acceptable material properties in the transvserse directions, the resutls converge fine. Best Regards, Vishakh.
  11. Vishakh_Rajendran

    Convergence of SIF results for a Composite

    Hello, I have a query with the Contour integrals capability in ABAQUS. When I request Stress Intensity Factor (SIF) results for an Isotropic material, there is very good convergence in the SIF results between contours 2. I try to request SIF results for a Composite (material defined...
  12. Vishakh_Rajendran

    Adaptive remeshing and Swept ? Structured meshes?

    Structured meshing and Sweep meshing technique results in a ordered sequencing of the elements. Say, if you have a rectangular part (with no cutouts or without any stress risers), you can use a structured mesh in this case. Say, if you have a small circular cutout (or a crack), you can have...
  13. Vishakh_Rajendran

    Concentrated Force on a Rigid body reference point

    Hello, The most important point is that, in your case, as per your question, the two parts are initially disconnected and they need to move towards each other and make contact. This type of analysis will always converge if you apply a boundary condition on the rigid body reference point. But...
  14. Vishakh_Rajendran

    Can I use a static linear perturbation step in ABAQUS?

    Hello, For the same model features, should the conditions support the usage (if we don’t have a complex load path / nonlinear load path / any non-linearity), a static linear perturbation step is faster than a general static step (and a static linear perturbation should be used in such cases)...
  15. Vishakh_Rajendran

    Abaqus design question

    Even within the same part, if you can create different sets (can be geometry based or elements based), then you can assign different material definitions / section definition to the different sets. BR, Vishakh.
  16. Vishakh_Rajendran

    Python script in ABAQUS

    The usage of python in ABAQUS can be for both pre - processing and post - processing (I mean comple pre - processing and complete post - processing). You can model the geometry, create the material, BC's, mesh etc etc and anything and everything using Python in ABAQUS. Example 1: The command...

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