![]() ![]() the new coordinate system, by using the "show" bundary load option (do not forget to remove the load when you have finished).įor the bending moment you need a little "trick", the best i to study and reproduce the example in the doc:ĮXAMPLE: TORSIONAL MOMENT ON A CYLINDER page 69 § Loads of the SMEUG.pdf (SME User Guide) Unfortunately COMSOL does not show the new coordinate system, so I use the trick to apply a Force load on a point and select the new coordinate system, and then check systematically the direction of Fx, Fy Fz w.r.t. ", I end up using often the "General" tab and define the new x',y',z' w.r.t the original x,y,z. Then you need to define your coordinate system: "Options - Coordinate systems New. If you have the material library there are a few examples there too ![]() This is for along x, along y and along z. For the anisotropy of Silicon you need to define for your volume/subdomain Material properties:Īnd then fill in the D Elasticity matrix, at least the essential Dij (D11, D12, D33) elements and then apply Si lattice symmetry rules (depending on the litteature you have: D11 around 169, D12 around 65 and D33 around 80).
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