CGASK12

Bulk Data Entry Defines the connections of the GASK12 solid gasket element.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CGASK12 EID PID G1 G2 G3 G4 G5 G6
G7 G8 G9 G10 G11 G12
CORDM CID

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CGASK12 71 4 3 4 5 6 7 8
9 10 11 12 13 14

Definitions

Field Contents SI Unit Example
EID Unique element identification number.

No default (Integer > 0)
PID Identification number of a PGASK property entry.

Default = EID (Integer > 0)
G# Grid point identification number of connection points.

No default (Integer > 0)
CORDM Flag indicating that the following field references the material coordinate system.
CID Material coordinate system identification number.

Default = 0 (Integer ≥ -1)

Comments

  1. Corner grid points G1, G2, and G3 must be given in consecutive order at the bottom face of the gasket element. Corner grid points G4, G5, and G6 must be on the top face with G4 opposite G1, G5 opposite G2, and so on.
    Edge grid points G7, G8, and G9 must be given in consecutive order at the bottom face of the gasket element. Edge grid points G10, G11, and G12 must be on the top face with G10 opposite G7, G11 opposite G8, and so on.
    Figure 1.


  2. If the user-defined node numbering on the bottom and top faces is reversed as compared to the sequence shown above, the nodes are renumbered to produce right-handed orientation of numbering. This is accomplished by swapping nodes G1 with G3, and G4 with G6. In such cases, the element local coordinate system will be built on the renumbered node sequence.
  3. The element coordinate system for the CGASK12 element is defined below.

    The local 3-direction (the gasket material thickness direction in default) is defined as the simple average of the unit normal directions on the top and bottom surfaces of the element. After the local 3-direction is defined, a local 1-2 plane is generated accordingly.

    Then, the local 1-direction and 2-direction are defined as follows: Project the basic x-axis onto the local 1-2 plane, and set it to be the default local 1-direction. If the basic x-axis is within 0.1° difference as the local 3-direction, project the basic z-axis onto the local 1-2 plane and set it to be the local 1-direction. The local 2-direction is determined then.

  4. The gasket material coordinate system is the same as the element coordinate system in default and can be defined as a prescribed system through PGASK entry.
  5. This card is represented as a gask12 element in HyperMesh.