Velocity and Pressure Dependent Friction: Difference between revisions

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(Created page with '{{CommandManualMenu}} This command is used to construct an elastomericBearing element object, which is defined by two nodes. The element can have zero length or the appropriate ...')
 
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{{CommandManualMenu}}
{{CommandManualMenu}}


This command is used to construct an elastomericBearing element object, which is defined by two nodes. The element can have zero length or the appropriate bearing height. The bearing has unidirectional (2D) or coupled (3D) plasticity properties for the
This command is used to construct an VPDependent friction model object.
shear deformations, and force-deformation behaviors defined by UniaxialMaterials in the remaining two (2D) or four (3D) directions. P-Delta moments are equally distributed to the two end-nodes. If the element has non-zero length, the local x-axis is determined from the nodal geometry unless the optional x-axis vector is specified in which case the nodal geometry is ignored and the user-defined orientation is utilized.


{|  
{|  
| style="background:yellow; color:black; width:800px" | '''frictionModel VPDependent $frnTag $iNode $jNode $ke $fy $alpha -P $matTag -Mz $matTag <-orient $x1 $x2 $x3 $y1 $y2 $y3> <-mass $m>'''
| style="background:yellow; color:black; width:800px" | '''frictionModel VPDependent $frnTag $muSlow $muFast0 $A $deltaMu $alpha $transRate'''
|}
|}


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|  style="width:150px" | '''$frnTag''' || unique friction model object tag
|  style="width:150px" | '''$frnTag''' || unique friction model object tag
|-
|-
| '''$iNode $jNode''' || end nodes
| '''$muSlow''' || coefficient of friction at low velocity
|-
|-
| '''$ke''' || initial elastic stiffness
| '''$muFast0''' || initial coefficient of friction at high velocity
|-
|-
| '''$fy''' || yield strength
| '''$A''' || nominal contact area
|-
|-
| '''$alpha''' || post yield stiffness ratio
| '''$deltaMu''' || pressure parameter
|-
|-
| '''-P $matTag''' || tag associated with previously-defined UniaxialMaterial in axial direction
| '''$alpha''' || pressure parameter
|-
|-
| '''-T $matTag''' || tag associated with previously-defined UniaxialMaterial in torsional direction
| '''$transRate''' || transition rate from low to high velocity
|-
| '''-My $matTag''' || tag associated with previously-defined UniaxialMaterial in moment direction around local y-axis
|-
| '''-Mz $matTag''' || tag associated with previously-defined UniaxialMaterial in moment direction around local z-axis
|-
| '''$x1 $x2 $x3''' || vector components in global coordinates defining local x-axis (optional)
|-
| '''$y1 $y2 $y3''' || vector components in global coordinates defining local y-axis (optional)
|-
| '''$m''' || element mass (optional, default = 0.0)
|}
|}


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EXAMPLES:
EXAMPLES:


element elastomericBearing 1 1 2 20.0 2.50 0.02 -P 1 -Mz 2;
frictionModel VPDependent 1 1 2 20.0 2.50 0.02 -P 1 -Mz 2;




Revision as of 22:14, 17 March 2010



This command is used to construct an VPDependent friction model object.

frictionModel VPDependent $frnTag $muSlow $muFast0 $A $deltaMu $alpha $transRate
$frnTag unique friction model object tag
$muSlow coefficient of friction at low velocity
$muFast0 initial coefficient of friction at high velocity
$A nominal contact area
$deltaMu pressure parameter
$alpha pressure parameter
$transRate transition rate from low to high velocity


EXAMPLES:

frictionModel VPDependent 1 1 2 20.0 2.50 0.02 -P 1 -Mz 2;


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

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