Velocity Dependent Friction: Difference between revisions

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


{|  
{|  
| style="background:yellow; color:black; width:800px" | '''frictionModel VDependent $frnTag $muSlow $muFast $transRate'''
| style="background:lime; color:black; width:800px" | '''frictionModel VelDependent $frnTag $muSlow $muFast $transRate'''
|}
|}


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<math>t - \Delta t\!</math>
<math>\[\mu  = {\mu _{fast}} - \left( {{\mu _{fast}} - {\mu _{slow}}} \right) \cdot {e^{ - transRate\, \cdot \,\left| v \right|}}\]</math>


<math>\Delta t\!</math>


<math>{\mu _{fast}} - \left( {{\mu _{fast}} - {\mu _{slow}}} \right) \cdot {e^{ - transRate\, \cdot \,\left| v \right|}}\!</math>
[[File:VDependentFriction01.png]]


[[File:VDependentFrictionCurveFit.png]]


EXAMPLES:


frictionModel VDependent 1 0.085 0.163 0.77
----
 
EXAMPLE:
 
frictionModel VelDependent 1 0.05 0.163 0.615
 
 
----
 
REFERENCE:
 
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.
 
 
----
 
RELATED TO:
 
* [http://opensees.berkeley.edu/wiki/index.php/Flat_Slider_Bearing_Element Flat Slider Bearing Element]
* [http://opensees.berkeley.edu/wiki/index.php/Single_Friction_Pendulum_Bearing_Element Single Friction Pendulum Bearing Element]
* [http://opensees.berkeley.edu/wiki/index.php/Triple_Friction_Pendulum_Element Triple Friction Pendulum Bearing Element]




Latest revision as of 20:05, 18 September 2014



This command is used to construct a VelDependent friction model object. 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 $frnTag $muSlow $muFast $transRate
$frnTag 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


<math>\[\mu = {\mu _{fast}} - \left( {{\mu _{fast}} - {\mu _{slow}}} \right) \cdot {e^{ - transRate\, \cdot \,\left| v \right|}}\]</math>



EXAMPLE:

frictionModel VelDependent 1 0.05 0.163 0.615


REFERENCE:

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.


RELATED TO:


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

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