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For Force per unit area, the traction components are given explicitly.
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For Total force, 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 Force per unit area. 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 Pressure, 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.
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