Eigenfrequency Analysis and friction

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Does Eigenfrequency Study in COMSOL consider the contact and friction, or geometrical nonlinearities to obtain dispersion curve?


1 Reply Last Post 19 sept. 2024, 03:51 UTC−4
Henrik Sönnerlind COMSOL Employee

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Posted: 1 week ago 19 sept. 2024, 03:51 UTC−4

If you use a prestressed eigenfrequency analysis, the linearization of the eigenvalue problem will include nonlinear effects from the prestress load case. This, for example, includes stress stiffening and geometrical changes caused be geometric nonlinearity.

Friction, however, is only taken into account to the extent that boundaries that are in contact in the prestress solution (and have friction) will be handled as 'glued'. Friction as such cannot be linearized. For a certain amplitude of vibration it could be sticking and at a larger amplitude sliding.

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Henrik Sönnerlind
COMSOL
If you use a prestressed eigenfrequency analysis, the linearization of the eigenvalue problem will include nonlinear effects from the prestress load case. This, for example, includes stress stiffening and geometrical changes caused be geometric nonlinearity. Friction, however, is only taken into account to the extent that boundaries that are in contact in the prestress solution (and have friction) will be handled as 'glued'. Friction as such cannot be linearized. For a certain amplitude of vibration it could be sticking and at a larger amplitude sliding.

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