ANSYS Explicit Dynamics Explicit Dynamics: Body Interactions

Recommended option for impact and sliding contact
between Solids, Shells and Beams.
• The trajectory of nodes and faces are tracked during
the computation cycle. If the trajectory of a node and
a face intersects during the cycle a contact event is
detected (see figure).
• Trajectory based contact does not constrain the time
step
– Often provides the most efficient solution.
• Nodes which penetrate into another element at the
start of the simulation will be ignored for contact and
should be avoided.
– To generate duplicate conforming nodes across a
contact interface
a) Use the multi-body part option in DesignModeler and set
the Shared Topology Method to either Imprint or None
b) In Meshing use Arbitrary Match Control (Sweep) or Match
mesh where possible (Patch Independent Tetrahedrons).

 Shell Thickness Factor
– The Shell Thickness Factor (STF) defines the shell (surface body) thickness used for
contact
• A factor of 1.0 takes the true physical shell thickness into account, which means that the contact
surface is positioned at half the true shell thickness on both sides of the shell mid plane.
• A factor of 0.0 means that the shell has no contact thickness and the contact surface is
positioned at the shell mid plane.
• Value must be between 0.0 and 5.0
– For shell node on shell face impacts, the node is always located at the mid-surface of
the shell.

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