Lennart
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Goal of this tutorial
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Training:
Relevant data for this tutorial:
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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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Inside the Post Processing the Failure Criteria, the displacements, the optimisation achievement index and the volume/mass are visible for all iterations
The Scale can be influenced individually
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Mass: 4445.9 6 g – This is a weight saving of 31 15 % compared to the default calculation with isotropic material and von Mises Stress as a Failure Criterion by taking advantage of the different directional dependent material limits!
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In this case the Failure Criterion is set to directional dependent (Tsai-Wu) instead of Tsai-Hill. With the Tsai-Wu failure criterion the compression strength besides the tensile strength can be taken into account.
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Mass: 3942.8 2 g – This is a weight saving of 47 21 % compared to the default calculation with isotropic material and von Mises Stress as a Failure Criterion by taking advantage of the different tension and compression strength besides the directional dependent material limits!
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The stiffness of the material is in all directions uniformly. As the Failure Criterion the FFF Thumb Rule is calculated. With the FFF Thumb Rule the maximum allowable Stress (Stress Goal) in build direction can be scaled. This is especially useful for a Manufacturing Method like FFF. The result is shown in the following picture with the same optimisation set up except the material properties and Failure Criterion.
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Mass: 4647.6 5 g – This is a 26 12 % weight saving compared with the von Mises Stress Failure Criterion by taking advantage of the higher allowable stress for the in-plane directions!
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The stiffness of the material is in all directions uniformly. As the Failure Criterion the von Mises Stress is calculated. The result is shown in the following picture with the same optimisation set up except the material properties and Failure Criterion.
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Mass: 5853.7 g – This is a weight increase of 47 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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