EDCONTACT, SFSI, RWPN, IPCK, SHTK, PENO, STCC, ORIE, CSPC, PENCHK
Specifies contact surface controls for an explicit dynamics analysis.
SFSIScale factor for sliding interface penalties. Defaults to 0.1.
RWPNScale factor for rigid wall penalties (defaults to 0). If RWPN =
0, rigid bodies interacting with rigid walls are not considered. If RWPN>0,
rigid bodies interact with fixed rigid walls. A value of 1.0 should be optimal;
however, this may be problem dependent.
IPCKInitial contact surface penetration checking option:
1 | — | No checking. |
2 | — | Full check of initial penetration is performed (default). |
SHTKShell thickness contact option for surface-to-surface and nodes-to-surface contact (see Notes below):
0 | — | Thickness is not considered (default). |
1 | — | Thickness is considered, except in rigid bodies. |
2 | — | Thickness is considered, including rigid bodies. |
PENOPenalty stiffness option (options 4 and 5 are useful for metal forming calculations):
1 | — | Minimum of master segment and slave node (default). |
2 | — | Use master segment stiffness. |
3 | — | Use slave node value. |
4 | — | Use area or mass weighted slave node value. |
5 | — | Use slave node value inversely proportional to shell thickness. (This may require special scaling and is not generally recommended.) |
STCCShell thickness change option for single surface contact:
1 | — | Shell thickness changes are not considered (default). |
2 | — | Shell thickness changes are included. |
ORIEOption for automatic reorientation of contact surface segments during initialization:
1 | — | Activate for automated (part ID) input only (default). |
2 | — | Activate for manual (nodal component) and automated (part ID) input. |
3 | — | Do not activate. |
CSPCContact surface penetration check multiplier, used if small
penetration checking is on (PENCHK = 1 or 2). Defaults
to 4.
PENCHKSmall penetration check, used only for contact types STS,
NTS, OSTS, TNTS, and TSTS. If the contact surface node penetrates more than
the target thickness times CSPC, the penetration
is ignored and the contacting node is set free. The target thickness is the
element thickness for shell elements, or 1/20 of the shortest diagonal for
solid elements.
0 | — | Penetration checking is off (default). |
1 | — | Penetration checking is on. |
2 | — | Penetration checking is on, but shortest diagonal is used. |
The thickness offsets are always included in single surface, automatic
surface-to-surface, and automatic nodes-to-surface contact. The shell thickness
change option must be used [EDSHELL,,,1] and a nonzero
value must be specified for SHTK before the shell
thickness changes can be included in the surface-to-surface contact type.
Additionally, STCC must be set to 2 if thickness
changes are to be included in the single surface contact algorithms.
To reset the contact options to default values, issue the EDCONTACT command with no fields specified.
This command is also valid in SOLUTION.
Distributed ANSYS Restriction This command is not supported in Distributed ANSYS.