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Issues encountered when exporting deformation models from Mechanical to intermed

    • 576650550
      Subscriber

      I will drag the files saved in Mechanical into a newly created Mechanical, and then link the new Mechanical to the geometry module. In the geometry, I want to save it as a .step file, but DesignModeler will execute the transform command to convert the Workbench model to the DesignModeler format.

      However, this command keeps failing, The error message is “Some or all bodies cannot be converted to DesignModeler format.”.

      I can export it when performing other static analysis. The model I am failing with is a micro-debonding model with a CZM (Cohesive Zone Model).

      What could be the reason for this consistent failure?

      Thank you very much.

    • Gary Stofan
      Ansys Employee

      Converting a deformed mesh into an editable CAD format is not a robust process. 

      It sounds like your model may have very small dimensions. 

      Sometimes you can get a successful conversion by upscaling the deformed model prior to conversion.

      There are some good tips in this forum post:     How do I get deformed geometry   

      Or search the AIS for "deformed convert to Parasolid"

      • 576650550
        Subscriber

        FE modeler is banned. But my flow was consistent with the method of the posts provided, but I imported the new mechanical model into geometry and the model couldn't be converted into DM format. It's true that my model deforms in a few percent of a um. Should I just import a larger amount of deformation and scale it back? Or change the unit?

    • Gary Stofan
      Ansys Employee

       

      Hello.
      Please describe or show a screenshot of how you “imported the new mechanical model into geometry”.

      In general, Parsolid conversion is more successful when the unit system is in a larger dimension, usually meters. 

      Another alternative is to use the .STL export, and see if it converts successfully into SpaceClaim or Discovery. 

       

       

       

      • 576650550
        Subscriber

        Because there are many tiny metal structures embedded in the substrate, it is difficult to repair the stl file well after it is exported

         

    • 576650550
      Subscriber

    • Gary Stofan
      Ansys Employee

      You can try the following upscale. There are no guaranteed methods to make this work however. 

      Insert these Commands in the Solution branch of Mechanical/Simulation. 

      It will make a new_geom.cdb that you can manually read into the Mechanical Model. 
      Note that I show an upscale of 1e6. You could try other values like 1e3

      save 
      finish 
      /prep7 
      upgeom,,,,file,rst 
      nscale,0,all,,,1e6,1e6,1e6 
      cdwrite,db,new_geom,cdb 

       

      • 576650550
        Subscriber

        I want to simulate the model with 0.00-um deformation in HFSS. This is my Model. I can translate to another Mechanical. But the model couldn't be converted into DM format.

      • 576650550
        Subscriber

        Can the small deformation model of connect debonding be exported?

    • Gary Stofan
      Ansys Employee

      If you upscale the deformed mesh (.cdb) as per the instuctions I provided, the chances of DM being able to convert into Parasolid are improved.
       

       

      • 576650550
        Subscriber

        The workbench format model cannot be converted to DM format

      • 576650550
        Subscriber

        not DM convert toParasolid

    • Gary Stofan
      Ansys Employee

      The .CDB is not directly converted to DM format. 

      The transfer from A6 Solution to B3 Model is via .CDB file. 
      The transfer from B3 Model to C2 DM Geometry via .PMDB file. 

       

      • 576650550
        Subscriber

        Yes I followed the procedure, but when I export stp model,fail. Should I only keep the result of deformation in A6, I keep the stress and deformation results

    • Gary Stofan
      Ansys Employee

      In this example, I am using the "upscaled" .CDB (new_geom.cdb) as input to External Model.
      We can confirm from Mechancial Model that the model is now much larger. 
      A larger dimension model may have a better chance of successfully converting to a solid, however it is not guaranteed. 

       

       


       

      • 576650550
        Subscriber

        When I export a Model, the message is: "Unable to save the file. The model geometry is invalid for this save operation."

      • 576650550
        Subscriber

        The model is now much larger. It seems like a mesh problem, I guess. 

    • Gary Stofan
      Ansys Employee

      Do you require a solid geometry file? Can you use the deformed Mesh for further analysis? 

      • 576650550
        Subscriber

        yes, But I want to export this model (deformed) as a solid file and import it into HFSS. When I export this model in DM, the message is: "Unable to save the file. The model geometry is invalid for this save operation."

      • 576650550
        Subscriber

        It cannot directly drag lines from  to HFSS in Workbench, so I need to export the file as an x_t or step file.

      • 576650550
        Subscriber

        Thanks for reminding me. And I can't use the deformed Mesh in AB for further analysis in mechanical

      • 576650550
        Subscriber

        What other methods are there?

      • 576650550
        Subscriber

        Is there any problem with this?

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