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If your Nondesign spaces are tearing off, your result looks something like the picture below

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Reasons

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why the Nondesign

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spaces are tearing off:

• either no force or displacement is applied → no stresses are available for the stress optimization

• or the force applied is too small Solution possibilities

• the additional fixation is not needed for the defined boundary conditions and optimization constraints

Steps to prevent this behaviour:

• Either it is a design proposal you can accept/

  even

  want to achieve in order to reduce the number of

  connecting

  fixation points

• Otherwise

  Or prevent the tearing off by:

  • set down the optimization stress goal

  creating an extra load case in which fixations and loads are switched​

  increasing the complexity → more elements are available and a finer model is possible (calculation effort increases!)

  • reducing the optimization stress goal

  • increasing the applied force so that the stresses and therefore the relevance of the nondesign space is increased

    increase the complexity → more elements are available and a finer model is possible (takes more time)

  • creating an extra load case in which fixations and loads are switched​

• If you are using the symmetry function

  and have setup

  with the whole model, the optimizer won't use the symmetrical nondesign spaces and will notify you thereof - don’t worry everything is just as it is supposed to be