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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.
Geht erst wenn verschiedene E-Module möglich sind Release 2020.2
Modelling of very smooth transitions between the design space and the fixed nondesign spaces:
Vergleichsbilder
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The transition between design and nondesign regions can be enhanced even further by adjusting the Youngs Modulus of the nondesign spaces. While reducing the Youngs Modulus by a factor of 10 the material is considered more pliant and therfore needs more material to absorb the stresses. This results in softer material transitions between the different materials and spaces
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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.