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If two separate studies or study steps are used, then the Values of variables not solved for must be set in the second study step, where only the beam problem is solved. Under Dependent Variables, you can also uncheck the Store in output check box for the beam cross section degrees of freedom in order to save space.
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You can transfer data between the two physics interfaces using the Beam Cross Section–Beam Coupling and Beam–Beam Cross Section Coupling multiphysics couplings if the interfaces belong to the same component.
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If you are using two different components, you must use a fully scoped variable name (like comp2.bcs3.A for the area) when referencing the beam cross-section properties in the input fields of the beam interface.
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If a beam interface is added either after or at the same time as a Beam Cross Section interface, the only study type shown when adding a physics interface is Stationary. In this case, under Custom Studies, select Preset Studies for Some Physics Interfaces to find the other study types available for the beam analysis.
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Values of Dependent Variables and Physics and Variables Selection in the COMSOL Multiphysics Reference Manual
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Channel Beam: Application Library path Structural_Mechanics_Module/Verification_Examples/channel_beam
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The material properties can be assigned to the domain in a Material node, and then the option From material is used in the Homogeneous Cross Section node. Alternatively, you can also select User defined, and enter expressions for the material data manually.
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Material data cannot be set locally in the Homogeneous Cross Section node. Usually, you would add a Single Layer Material node under Materials in the component to provide the material data. You can, however, also use a global Layered Material, which is then referenced from a Layered Material Link in the component. A boundary is not eligible for selection in the physics interface until a layered material has been assigned.
A layered material has, in addition the material data, three more inputs. The only one that may need to be changed is the Thickness, lth. It is not used as long as you are only computing cross-section properties, but if you are mapping results back from a beam interface, it should match the length of the beam.
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After changing data in this section, you do not need to compute the study for this physics interface again once is has been solved. It is sufficient to do an Update Solution to get the stress plots updated.
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Studies and Solvers in the COMSOL Multiphysics Reference Manual
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