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If no boundary condition is applied on one of these Nondesign spaces, 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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