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!SECTION¶

Definition of sections

1st line

!SECTION, TYPE=<type>, EGRP=<egrp> [, optional parameter]

Parameter
`TYPE`	Section type (required)
`EGRP`	Element group name (required)
`MATERIAL`	User-defined material name (required)
`SECOPT`	Auxiliary parameter for the element type (optional; =0 if omitted)
`INPUT`	External file name (optional)

Parameter name	Parameter value	Description
`TYPE`	`SOLID`	Rod, triangular, quadrilateral, tetrahedral, pentahedral, and hexahedral elements
	`SHELL`	Shell elements
	`BEAM`	Beam elements
	`INTERFACE`	Interface elements and connector elements
`EGRP`	<egrp>	Element group name
`MATERIAL`	<material >	User-defined material name
`SECOPT`	<secopt>	= 0: unspecified, plane stress = 1: plane strain = 2: axisymmetric =10: 0 + reduced integration =11: 1 + reduced integration =12: 2 + reduced integration
`INPUT`	<filename>	External file name (optional); may also be used together with the 2nd and subsequent lines

The section type must be consistent with the element types contained in the element group specified by EGRP. The correspondence is as follows (see !ELEMENT for details of element types).

Section type	Corresponding element types
`SOLID`	111, 231, 232, 241, 242, 301, 341, 342, 351, 352, 361, 362
`SHELL`	731, 741, 743, 761, 781
`BEAM`	611, 641
`INTERFACE`	511 (connector element), 541 (interface element)

2nd line and subsequent lines

For TYPE=SOLID

(2nd line) `THICKNESS`

Variable name	Attribute	Description
`THICKNESS`	R	Cross-sectional area for truss elements (required)

For TYPE=SOLID, THICKNESS may be omitted.

For TYPE=SHELL

(2nd line) THICKNESS, INTEGPOINTS

Variable name	Attribute	Description
`THICKNESS`	R	Shell section thickness
`INTEGPOINTS`	I	Integration points through the shell section thickness

For TYPE=BEAM

(2nd line) vx,vy,vz,area,Iyy,Iz,Jx

Variable name	Attribute	Description
vx,vy,vz	R	Reference-axis direction
area	R	Cross-sectional area
Iyy, Izz	R	Second moment of area
Jx	R	Torsional constant

For TYPE=INTERFACE

(2nd line) THICKNESS, GAPCON, GAPRAD1, GAPRAD2

Variable name	Attribute	Description
`THICKNESS`	R	Section thickness
`GAPCON`	R	Gap heat-transfer coefficient (0 if omitted)
`GAPRAD1`	R	Gap radiative heat-transfer coefficient-1 (0 if omitted)
`GAPRAD2`	R	Gap radiative heat-transfer coefficient-2 (0 if omitted)

TYPE=INTERFACE is used for connector elements (511), which represent springs and dashpots, in addition to interface elements (541). For connector elements, THICKNESS is not used in stiffness or damping calculations because they have no cross section, but the 2nd line itself cannot be omitted and a positive value must be specified (1.0 is sufficient). GAPCON, GAPRAD1, and GAPRAD2 are parameters used for heat-transfer calculations and are not used for connector elements.

For a connector element's MATERIAL, specify the material name for which the spring constant or damping coefficient is defined (a material for which !SPRING_A / !SPRING_D / !DASHPOT_A / !DASHPOT_D is specified under !MATERIAL on the cnt side).

Notes

An error occurs if parameter TYPE is not consistent with the element type.
An error occurs if any element has no SECTION information.
An error occurs if a section name is duplicated.

Example

!SECTION, EGRP=SOLID1, TYPE=SOLID, MATERIAL=STEEL
!SECTION, EGRP=SHELL2, TYPE=SHELL, MATERIAL=STEEL
1.0, 5

Example of assigning a section to connector elements (element type 511). When mixed with solid elements, define separate element groups and sections.

!ELEMENT, TYPE=341, EGRP=ESLD
...
!ELEMENT, TYPE=511, EGRP=ESPRING
...
!SECTION, TYPE=SOLID,     EGRP=ESLD,    MATERIAL=MATERIAL1
1.0
!SECTION, TYPE=INTERFACE, EGRP=ESPRING, MATERIAL=MATERIAL2
1.0

!SECTION¶

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