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

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If no boundary condition is applied on one of these Nondesign spaces or a condition is applied to several spaces at ones, a warning will occur but the optimization will continue.

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Reasonswhy the Nondesign spaces are tearing off:

• either no force or displacement is applied → no stresses are available for the stress optimization to prevent the material from being reduced

• or the force applied is too small

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

• If you are using the symmetry function 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

Steps to prevent this behaviour:

• Prevent the tearing off by:

  • 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

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

• Either it is a design proposal you can accept/want to achieve in order to reduce the number of fixation points

  • To reduce the number of fixations, the fixation has to be applied on all Nondesign spaces at once as one boundary condition (multi-selection)

    • Thus individual Fixations can tear off without an ocurring error

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