BSCONP (Surface Contact Parameters)

Description

The BSCONP entry defines the parameters for a surface contact region.

Format

1	2	3	4	5	6	7	8	9	10
BSCONP	CRID	SLAVE	MASTER	SFACT	CAPTOL	MU	PTYPE	MAXAD

Example

BSCONP

11

2

5

0.2

2

Field	Definition	Type	Default
CRID	Contact region identification number.	Integer > 0	Required
SECONDARY	Secondary region identification number. This is the CSID for a BSSEG entry or a generated contact surface.	Integer > 0	Required
PRIMARY	Primary region identification number. This is the CSID for a BSSET entry or a generated contact surface.	Integer > 0	Required
SFACT	Stiffness scaling factor. The stiffness scaling factor is used to scale the penalty values. The penalty values are determined automatically. See Remark 4.	0 < Real ≤ 1.0	0.2
CAPTOL	Capture tolerance parameter for tied contact pairs. This value is used for tied contact. Regions of opposing contact surfaces within a distance controlled by this parameter are tied together. See Remark 6.	Real ≥ 0.0	0.05
MU	Coefficient of static friction.	Real ≥ 0.0	0.0
PTYPE	Penetration type: 1 = Unsymmetric general contact (secondary penetration only) 2 = Symmetric general contact 3 = Unsymmetric welded contact 4 = Symmetric welded contact	1 ≤ Integer ≤ 4	1
MAXAD	Maximum activation parameter: See Remark 5.	Real ≥ 0.0	0.5

Remarks

1. The contact region identification number, CRID, must be unique with respect to all other BSCONP identification numbers.
2. The SECONDARY field defines the secondary surface by referencing a user defined BSSEG Bulk Data entry or a generated contact surface from a CONTACTGENERATE command. The generated contact surface from a CONTACTGENERATE command uses a CSID that references the PID on a property entry. See the discussion of the CONTACTGENERATE command.
3. The PRIMARY field defines the primary surface by referencing a user defined BSSEG Bulk Data entry or generated contact surface from a CONTACTGENERATE command. The generated contact surface from a CONTACTGENERATE command uses a CSID that references the PID on a property entry. See the discussion of the CONTACTGENERATE command.
4. SFACT may be used to scale the penalty values that are computed automatically. Values of SFACT greater than 0.5 are not recommended as they can lead to numerical instability.
5. MAXAD may be used to prevent unnecessary generation of contact. Contact is only generated if the distance from any contact surface primary node to the potential secondary node is less than MAXAD * L_c, where L_c is a characteristic segment length determined from the faces on the contact surface.
6. The value of CAPTOL is used to determine the extent of tied contact during initialization. Regions of opposing contact surfaces that are within a distance CONTACTOL * L_c, where L_c is a characteristic segment length determined from the faces on the contact surfaces, are tied together.