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The force boundary condition applies a distributed force to the structure. It can be applied to the faces of a structure. It works as a surface traction on each element of the assigned topological entity and its value is proportional to each element’s area.

The user has to define the force components in the global coordinate system. Each force component can be applied as a constant value, function, or table. For function or table input, the value can depend on time (or frequency respectively) or spatial coordinates.

The figure below illustrates what happens when a force boundary condition is assigned to multiple entities:

force boundary condition setup
Figure 1: Two faces with the same area assigned to the same force boundary condition

In the configuration above, since both faces have the same surface area, a force of 25 Newtons in the x-direction and 50 Newtons in the y-direction will be applied on each face.

In the example below, face 2 has twice as much area as face 1. As a result, the 150 Newtons are split proportionally to their areas. Therefore, 50 Newtons are applied to face 1, whereas face 2 receives 100 Newtons.

force boundary condition applied to multiple surfaces
Figure 2: Force boundary condition applied to two different surfaces

Last updated: June 15th, 2020

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