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Create the material in the Materials editor and assign it to the Design Space
Assuming the part should be printed with a Manufacturing Method like FFF, a Transversely Isotropic material is applied.
The specific values needed are the Young's Modulus in build direction (1700 MPa) and in in-plane direction (1900 MPa), the Shear Modulus (730 MPa) and the Poisson ratio (0.3) for xy and (0.39) for yz. The density is set to 0.9e-6 kg/mm3.
As the last input the material limits should be entered. Which of these are required depends on the optimisation intention and the chosen Failure Criterion. In this case we want to take advantage of the directional dependent material limits as well as different limits for tension and compression (directional dependent Tsai-Wu).
These values are optional, if a different Failure Criterion is selected, less material input is required
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Influence of Material Properties & Failure Criteria
The chosen material properties and Failure Criteria influence the resulting design. The Failure Criterion with the chosen material limits for all directions uniformly (von Mises), directional dependent (FFF-Thumb Rule or Tsai-Hill) or taking into account different tension and compression strength besides directional dependency (Tsai-Wu) has the biggest impact on the Design.
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Mass: 53.7 g – This is a weight increase of 21 % compared with the transversely isotropic material by taking advantage of higher allowable stresses for the in-plane directions and compression (Directional dependent Tsai-Wu Failure Criterion)!
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The whole MSC Apex Generative Design project with all results can be downloaded here:
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In case of anisotropic material stiffness and the directional dependent Tsai-Wu transversely isotropic Failure Criterion with huge material property differences for the in-plane directions and the build direction, as well for the maximum allowable tensile and compression strength, the optimisation may not give stable results. |
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