There are currently three different Displacements constraints you can use.
Clamped constraint, which block every degree of freedom
General constraint, where you can define which translational movement you want to block
Axial constraint, where you can choose an axis for which the only the axial movement stays free. If you choose a face, the translational movement in the direction of normal vector stays free
Modelling of a Screw Fixation
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Opportunity 1:
A screw fixation can be modelled by using a
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Nondesign space (red) around the screw
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as a shell. The Nondesign space is constrained using a clamped fixation.
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Opportunity 2:
To simulate the reality it is also possible to
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import/create an extra volume that’s representing the screw.
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The screw (blue) will be used as a fixation and is
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clamped. Additionally, there should be a
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Nondesign space around the screw (red), which
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is included in the design space
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but
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will not be used as a fixation in the
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optimisation model. This way the
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Nondesign space does not experience an artificial stiffening, which represents the reality much more accurately.
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However, keep in mind that the screw becomes a part of the Design space, so you need the original Design space without the screw to create a good intersection with the optimisation results. Further information regarding the intersection here.