Friction dialog box (Abaqus)

The Friction dialog box corresponds to the Abaqus *FRICTION keyword. For more information, see *FRICTION in the Abaqus Keywords Reference Guide.

Modeling Object
Name	Sets the name of the modeling object.
Label	Sets a unique integer for the modeling object.This label also appears in the Modeling Objects Manager dialog box, and you can filter the objects listed in that dialog box by their label.
Friction Parameter
Friction Model	Specifies a friction model. Penalty MethodUses the Penalty Method friction model that relates the maximum allowable frictional (shear) stress across an interface to the contact pressure between the contacting bodies.RoughSpecifies completely rough (no slipping) friction. This option corresponds to the ROUGH parameter for the *FRICTION keyword.Exponential DecaySpecifies separate static and kinetic friction coefficients with a smooth transition zone defined by an exponential curve. This option corresponds to the EXPONENTIAL DECAY parameter for the *FRICTION keyword.LagrangeAvailable for Abaqus Structural analyses. Specifies the Lagrange multiplier formulation for friction. This option corresponds to the LAGRANGE parameter for the *FRICTION keyword.
Coulomb Friction Model
Appears when Friction Model is set to Penalty Method or Lagrange.
Coulomb Friction Type	Specifies the material behavior. Isotropic and Anisotropic are available for Structural analyses, while Isotropic is available for Dynamic Explicit analyses.
Isotropic Coulomb Friction Model
Appears when Friction Model is set to Penalty Method or Lagrange, and Coulomb Friction Type is set to Isotropic.
Friction Coefficient Dependence	Specifies the type of friction coefficient. Parameter-IndependentSelect to specify a friction coefficient that does not depend on slip rate, contact pressure, temperature, or field variables.Slip Rate DependentSelect to specify a friction coefficient that depends only on slip rate.Slip Rate, Contact Pressure and Temperature DependentSelect to specify a friction coefficient that depends on slip rate, contact pressure, and temperature.
Friction Coefficient	Appears when Friction Coefficient Dependence is set to Parameter-Independent.Specifies a friction coefficient that is not dependent on slip rate, contact pressure, temperature, or field variables.
Slip-Rate Dependent Friction	Appears when Friction Coefficient Dependence is set to Slip Rate Dependent.Specifies a friction coefficient that is dependent on slip rate. Create or use an existing field to define the friction coefficient. Create or use an existing formula field to define the values for slip rate.
Slip-Rate, Contact Pressure and Temperature Dependent Friction	Specifies a friction coefficient that is dependent on slip rate, contact pressure, and temperature.Create or use an existing formula field to define the values for slip rate, contact pressure, and temperature, where:Slip-Rate: \gamma eqContact Pressure: pAverage temperature: \ThetaAverage temperature at the contact point between the two contact surfaces. If you do not enter a value, the software assumes the friction coefficient is independent of that value. For example, if you do not specify average temperature, the software assumes the friction coefficient is independent of average temperature. For more information about formula fields, see Formula fields.
Anisotropic Coulomb Friction Model
Appears when Friction Model is set to Penalty Method or Lagrange, and Coulomb Friction Type is set to Anisotropic.
Friction Coefficient Dependence	Specifies the type of friction coefficient. Parameter-IndependentSpecifies a friction coefficient that does not depend on slip rate, contact pressure, temperature, or field variables.Slip Rate DependentSpecifies a friction coefficient that depends only on slip rate.
Friction Coefficient 1	Appears when Friction Coefficient Dependence is set to Parameter-Independent.Specifies the friction coefficient in the first slip direction.
Friction Coefficient 2	Appears when Friction Coefficient Dependence is set to Parameter-Independent.Specifies the friction coefficient in the second slip direction.
Slip-Rate Dependent Anisotropic Friction	Appears when Friction Coefficient Dependence is set to Slip Rate Dependent.Specifies a friction coefficient that is dependent on slip rate. Create or use an existing formula field to define the values for slip rate.
Exponential Decay Friction Model
Appears when Friction Model is set to Exponential Decay Friction Model.
Static-Kinetic Exponential Decay Type	Specifies the decay type. Exponential Function CoefficientsSelect to specify the static friction, kinetic friction, and the decay coefficients.Test DataSelect to provide test data points to fit the exponential model. You must enter at least two data points. The first point represents the static coefficient of friction specified at zero slip rate () The second point corresponds to an experimental measurement taken at a reference slip rate () (Optional) The third data point characterizes the exponential decay (kinetic friction coefficient).If you do not specify a third point, the software automatically provides a third data point to model the assumed asymptotic value of the friction coefficient at infinite velocity.
Static Friction Coefficient	Appears when Static-Kinetic Exponential Decay Type is set to Exponential Function Coefficients.Sets the value of the friction coefficient, μ.
Kinetic Friction Coefficient	Appears when Static-Kinetic Exponential Decay Type is set to Exponential Function Coefficients.Sets the value of the kinetic friction coefficient, μk.
Decay Coefficient	Appears when Static-Kinetic Exponential Decay Type is set to Exponential Function Coefficients.Sets the value of the decay coefficient, dc.
Static Friction Coefficient at Zero Slip Rate	Appears when Static-Kinetic Exponential Decay Type is set to Test Data.Sets the value for the first data point, which represents the static coefficient of friction specified at zero slip rate ()
Friction Coefficient (Second Data Point)	Appears when Static-Kinetic Exponential Decay Type is set to Test Data.Sets the friction coefficient value for the second data point.
Slip Rate (Second Data Point)	Appears when Static-Kinetic Exponential Decay Type is set to Test Data.Sets the slip rate for the second data point.
Kinetic Friction Coefficient	Appears when Static-Kinetic Exponential Decay Type is set to Test Data.(Optional) Sets the kinetic friction coefficient value for the third data point. If you do not specify a third point, the software automatically provides a third data point to model the assumed asymptotic value of the friction coefficient at infinite velocity.
Softened Tangential Behavior
Appears for Dynamic Explicit analyses when Friction Model is set to Penalty Method or Exponential Decay.
Activate Softened Tangential Behavior	Specifies the slope of the curve that defines the shear traction as a function of the elastic slip between the two surfaces, k.
Shear Traction Slope	Appears when you select the Activate Softened Tangential Behavior check box.Sets the value for the shear traction slope.This option corresponds to the SHEAR TRACTION SLOPE parameter of the Abaqus *FRICTION keyword.
Stiffness Method for Frictional Constraints
Appears when Friction Model is set to Penalty Method or Exponential Decay.
Stiffness Method	Specifies the stiffness method.Slip ToleranceHelps increase computational efficiency or accuracy, depending on the slip rate tolerance value specified.Elastic SlipProvides the magnitude of allowable elastic slip for the relative displacement that can occur before surfaces begin to slip.
Slip Tolerance	Appears when Stiffness Method is set to Slip ToleranceSets the slip tolerance. To increase computational efficiency, type a value larger than 0.005. To increase accuracy, type a value smaller than 0.005.
Elastic Slip	Appears when Stiffness Method is set to Elastic SlipSets the elastic slip, the magnitude of allowable elastic slip for the relative displacement that can occur before surfaces begin to slip.
Shear Stress Limit TAUSMAX
Appears when Friction Model is set to Penalty Method or Lagrange.
Use Optional Shear Stress Limit	Lets you specify the shear stress limit.
Shear Stress Limit	Appears when you select the Use Optional Shear Stress Limit check box.Sets the maximum achievable value of the equivalent shear stress.

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Friction dialog box (Abaqus), Simcenter 3D 2021.1 Series

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