The Magnetomechanical Forces and Magnetic Forces coupling features apply the material and underlying free space contributions to the stress as body load. In weak form: -σEM:test(T).
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The Magnetomechanical Forces and Magnetic Forces coupling features apply the above defined traction as a boundary load on the boundaries which are external for the coupling feature selection but internal for the corresponding magnetic fields interface.
COMSOL Multiphysics does not explicitly include the ambient pressure definition on the coupling features. However, it is possible to add an additional surface force to the corresponding Solid Mechanics interface if the pressure is known or computed by another physics interface.
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COMSOL Multiphysics provides a choice of the electromagnetic stress form only in the Magnetic Forces coupling feature. Any of the above presented three options can be selected; the default choice is the Minkowski stress tensor.
Magnetomechanical Forces coupling feature always operates with Minkowski stress tensor form.
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