CGASK16

Bulk Data Entry

CGASK16 – Six-sided Solid Gasket Element with Sixteen Grid Nodes

Description

Defining the connections of the GASK16 solid gasket element.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CGASK16	EID	PID	G1	G2	G3	G4	G5	G6
	G7	G8	G9	G10	G11	G12	G13	G14
	G15	G16
	CORDM	CID

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CGASK16	71	4	3	4	5	6	7	8
	9	10	11	12	13	14	15	16
	17	18

Field	Contents
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	Identification number of the material coordinate system. Default = 0 (Integer ≥ -1)

Comments

1.	Corner grid points G1, …, G4 must be given in consecutive order at the bottom face of the gasket element. Corner grid points G5, …, G8 must be on the top face with G5 opposite G1, G6 opposite G2, and so on.

Edge grid points G9, …, G12 must be given in consecutive order at the bottom face of the gasket element. Edge grid points G13, …, G16 must be on the top face with G13 opposite G9, G14 opposite G10, and so on.

cgask16

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 G5 with G7. In such cases, the element local coordinate system will be built on the renumbered node sequence.

3.	The element coordinate system for the CGASK16 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 gask16 element in HyperMesh.