COMSOL 6.2 - Face Load (Thin Layer)

Add a node to apply tractions or pressure on boundaries where the material is active.

The is selected by default. The list contains all applicable coordinate systems in the model. Prescribed loads are specified along the axes of this coordinate system.

Force

Select the — , , or . is also available for 2D components. Then enter values or expressions for the boundary load components based on the selection and the space dimension.

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For , the traction components are given explicitly.

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For , the total force is divided by the area of the boundaries where the load is active. Then it is applied in the same way as for a . When working with curved boundaries or local coordinate systems, use this option carefully, as the result is not always intuitive.

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For , a scalar input is given, and the orientation of the load is given by the normal to the boundary. The pressure is positive when directed toward the thin layer. In a geometrically nonlinear analysis, the current surface normal and area are used.


	After selecting a Load type, the Load list normally only contains User defined. When combining with another physics interface that can provide this type of load, it is also possible to choose a predefined load from this list.

Table 4-7: Face load types.
Load Type	variable	SI unit	Geometric Entity Level	Space Dimension (components)
Force per unit area	FA	N/m2	boundaries	3D (x, y, z) 2D (x, y) 2D axisymmetric (r, z)
Force per unit length	FL	N/m	boundaries	2D (x, y)
Total force	Ftot	N	boundaries	3D (x, y, z) 2D (x, y) 2D axisymmetric (r, z)
Pressure	p	Pa	boundaries	3D (x, y, z) 2D (x, y) 2D axisymmetric (r, z)

Linear Buckling

To display this section, click the button (

) and select in the dialog box.

If you are performing a linear buckling analysis with a combination of live and dead loads, select the check box to indicate that the load contributions from this node are constant. The default is that a load is proportional to the load factor.


	For more information about live and dead loads, see Buckling Analysis.

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You can add the Phase subnode to specify the phase of this load in a frequency domain analysis.

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You can specify this load to be a Harmonic Perturbation in a frequency domain analysis.

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You can assign this load to a load group. See Load Cases in the Structural Mechanics Modeling chapter.

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Modeling Thin Layers in the Structural Mechanics Modeling chapter.

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Thin Layers in the Structural Mechanics Theory chapter.

Location in User Interface

Context Menus

Ribbon

Physics tab with node selected in the model tree: