CNTITF

Bulk Data Entry Defines parameters for contact (S2S and N2S) interference.

This entry is supported with nonlinear static and nonlinear transient analysis types for both small and large displacement analysis. The CNTITF Bulk Data Entry should be referenced by a CNTITF Subcase Information Entry to be applied in a particular subcase.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CNTITF ID METHOD H1
The following continuation line (beginning with the CNTINT flag) is used to define another set of interference parameters, which locally overrides the set of parameters above, and applies locally on a specific contact interface (CTID). It can be repeated as required.
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CNTINT CTID METHOD H1

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CNTITF 98 INST
CNTINT 51 INCR
CNTINT 52 222

Definition

Field Contents SI Unit Example
ID Each CNTITF Bulk Data Entry should have a unique ID.

No default (Integer > 0)

  
METHOD Flag indicating how contact interference is applied.
INCR (Default)
Initial contact penetration is resolved over one subcase (incrementally).
INST
Initial contact penetration is resolved in one incremental step (instantly).
Integer
Table ID as per which penetration is resolved.
  
H1 The amount of allowable penetration, which will not be resolved in the subcase and its continued subcases. Contact with penetration smaller than this value is considered as open.
Blank (Default)
0.0
Real
The allowable penetration.
(Real ≥ 0.0)
Note: The H1 field should be blank, if METHOD field is set to INST or a table ID.
  
CNTINT Defines the start of a continuation line used to specify another set of interference parameters, which overrides the set of parameters defined above, for a specific contact interface (CTID). It can be repeated as required.  
CTID Contact interface identification number.

No default (Integer > 0)

  

Comments

  1. The CNTITF Bulk Data Entry is selected by the CNTITF Subcase Information Entry.
  2. TABLES1 and TABLEG can be referenced in METHOD field. In the table, time and factor are defined in X- and Y- column, respectively. The factors are multiplied on the initial penetration amount to indicate the restored penetration amount at the specified time. The y-value of the last point specifies the ratio of the allowable penetration over the initial penetration in the following subcases. The y-value of the first points must be 1.0.
  3. When a CNTITF card is not defined, initial contact penetration of all N2S and S2S contact will be resolved in the root subcase, which is equivalent to METHOD = INCR and H1 as blank.