7.6.3. Tie Contact Output

Contact forces are reported in the Motion Postprocessor as shown in the table below.

Figure 7.22: Definition of Tie Contact outputs

ParameterSymbolDescriptionDimension
Force_on_Action_Marker
Definition of Tie Contact outputs

The total force vector acting on the action nodes can be calculated as follows:

Definition of Tie Contact outputs

where the variable n is the number of bonding points and Definition of Tie Contact outputs  is the constrained force at a bonding point as defined in Equation 6–69 in the Motion Theory Reference.

Force
Torque_on_Action_Marker
Definition of Tie Contact outputs

The total torque vector acting on the action nodes can be calculated as follows:

Definition of Tie Contact outputs

where the variable Definition of Tie Contact outputs  is the constrained torque at a bonding point.

Force*Length
Normal ForcefnThe averaged normal force on the action body can be calculated as follows:

Definition of Tie Contact outputs

where the variable un,i is the normal direction at a contact point. 		Force
Penetration-p

The averaged penetration can be calculated as follows:

Definition of Tie Contact outputs

where pi is the penetration at the contact point.

Note:  According to Equation 6–19, contact penetration is calculated as negative by the solver, and negative contact penetration is reported with a positive sign to aid user comprehension.

Length
Friction Forceff

The averaged tangential force on the action body can be calculated as follows:

Definition of Tie Contact outputs

where the variable ut,i is the tangential direction at a contact point.

Force
Stiction SlipN/A

The averaged slip status at the contact points:

  • 0 : No contact

  • 1 : Tie constraint applied

N/A
Force Magnitudefa

The averaged force magnitude on the action body can be calculated as follows:

Definition of Tie Contact outputs

Force