Velocity Dependent Friction

This command is used to construct a VelDependent friction model. It is useful for modeling the behavior of [PTFE] or PTFE-like materials sliding on a stainless steel surface. For a detailed presentation on the velocity dependence of such interfaces please refer to Constantinou et al. (1999).

frictionModel VelDependent $tag $muSlow $muFast $transRate

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tag	unique friction model object tag
muSlow	coefficient of friction at low velocity
muFast	coefficient of friction at high velocity
transRate	transition rate from low to high velocity

μ = μ_fast − (μ_fast−μ_slow) ⋅ e^{−transRate ⋅ |v|}

Velocity dependent friction model response.

VDependentFrictionCurveFit.png

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Examples

frictionModel VelDependent 1 0.05 0.163 0.615

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References

Constantinou, M.C., Tsopelas, P., Kasalanati, A., and Wolff, E.D. (1999). “Property modification factors for seismic isolation bearings”. Report MCEER-99-0012, Multidisciplinary Center for Earthquake Engineering Research, State University of New York.

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Code Developed by: Andreas Schellenberg, University of California, Berkeley.