Configuring tangential behavior for connector friction

You can select a friction formulation for predefined and
user-defined connector friction models.

You use the Tangential Behavior tabbed page in the
connector section editor to make the selection. For more information, see
Using the basic Coulomb friction model.
You can choose from the following:

Penalty. Specify a friction coefficient.

Static-Kinetic Exponential Decay. Specify
separate static and kinetic friction coefficients with a smooth transition zone
defined by an exponential curve.

Configure tangential behavior using the Penalty
friction formulation

Display the connector section editor by following the procedure
outlined in
Defining friction,
and select the Tangential Behavior tabbed page.

From the Friction formulation field, select
Penalty.

On the Friction Coefficient tabbed page, enter
the following data:

Friction
Coeff

Friction coefficient, $\mu $.

Slip
Rate

If desired, toggle on Use slip-rate-dependent
data and enter the slip rate, ${\dot{\gamma}}_{eq}$.

Contact
Pressure

If desired, toggle on Use contact-pressure-dependent
data and enter the contact pressure, p.

Temp

If desired, toggle on Use temperature-dependent
data and enter the average temperature at the contact point,
$\overline{\theta}$,
between the two contact surfaces.

Field 1,
Field 2, etc.

If desired, specify the Number of field variables
and enter the average value of the first field variable,
${\overline{f}}^{1}$,
the average value of the second field variable, ${\overline{f}}^{2}$,
etc.

On the Shear Stress tabbed page, specify the
shear stress limit.

No limit

Indicates no limit on the equivalent shear stress.

Specify

Enter the equivalent shear stress limit, ${\tau}_{max}$;
that is, the maximum achievable value of the equivalent shear stress.

On the Elastic Slip tabbed page, choose a method
for modifying the allowable elastic slip (applies only to
Abaqus/Standard
analyses).

Fraction of characteristic
model dimension

Enter the ratio of the allowable maximum elastic slip to a
characteristic model dimension. The default value is 0.0001.

Absolute
distance

Enter the absolute magnitude of the allowable elastic slip,
${\gamma}_{i}$,
to be used in the stiffness method for sticking friction.

Configure tangential behavior using the Static-Kinetic
Exponential Decay friction formulation

Display the connector section editor by following the procedure
outlined in
Defining friction,
and select the Tangential Behavior tabbed page.

From the Friction formulation field, select
Static-Kinetic Exponential Decay.

On the Friction Coefficients tabbed page, choose
the exponential decay definition and enter the coefficients or test data.

Coefficients. Provide the static friction
coefficient, kinetic friction coefficient, and decay coefficient directly.

Static
Coeff

Enter the static friction coefficient, ${\mu}_{s}$.

Kinetic Coeff

Enter the kinetic friction coefficient, ${\mu}_{k}$.

Decay
Coeff

Enter the decay coefficient, ${d}_{c}$.

Test data. Provide test data points to fit
the exponential model.

Friction
Coeff

Enter the static coefficient of friction specified at
${\dot{\gamma}}_{eq}=0.0$.

Enter the dynamic friction coefficient, an experimental
measurement taken at a reference slip rate, ${\dot{\gamma}}_{2}$.

Enter the kinetic friction coefficient,
${\mu}_{\mathrm{\infty}}$. This
value corresponds to the asymptotic value of the friction coefficient at
infinite slip rate, ${\dot{\gamma}}_{\mathrm{\infty}}$.

Slip
Rate

Enter the reference slip rate, ${\dot{\gamma}}_{2}$,
used to measure the dynamic friction coefficient.

On the Elastic Slip tabbed page, choose a method
for modifying the allowable elastic slip (applies only to
Abaqus/Standard
analyses).

Fraction of characteristic
model dimension

Enter the ratio of the allowable maximum elastic slip to a
characteristic model dimension. The default value is 0.0001.

Absolute
distance

Enter the absolute magnitude of the allowable elastic slip,
${\gamma}_{i}$,
to be used in the stiffness method for sticking friction.