!SECTION¶

Definition of section

1st Line

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

Parameter
`TYPE`	Section type (mandatory)
`EGRP`	Element group name (mandatory)
`MATERIAL`	User defined material name (mandatory)
`SECOPT`	Auxiliary parameter for the element type (omissible, becomes =0 when omitted)
`INPUT`	External file name (omissible)

Parameter Name	Parameter Value	Contents
`TYPE`	`SOLID`	Rod, triangular, quadrilateral, tetrahedral, pentahedral, hexahedral elements
	`SHELL`	Shell element
	`BEAM`	Beam element
	`INTERFACE`	Interface element, connector element
`EGRP`	<egrp>	Element group name
`MATERIAL`	<material>	Material name defined by user
`SECOPT`	<secopt>	= 0: Not specified, plane stress
		= 1: Plane strain
		= 2: Axial symmetry
		= 10: 0 + reduced integration
		= 11: 1 + reduced integration
		= 12: 2 + reduced integration
`INPUT`	<filename>	External file name (omissible), can also be used together with the 2nd line or later

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

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 or later

In the case of [TYPE=SOLID]

(2nd Line) THICKNESS

Parameter Name	Attributions	Contents
`THICKNESS`	R	Element thickness, cross-sectional area

In the case of "TYPE=SOLID", the "THICKNESS" can be omitted, and default value (1.0) is inserted.

In the case of [TYPE=SHELL]

(2nd Line) THICKNESS, INTEGPOINTS

Parameter Name	Attributions	Contents
`THICKNESS`	R	Shell cross section thickness
`INTEGPOINTS`	I	Integral point in shell cross sectional direction

In the case of [TYPE=BEAM]

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

Parameter Name	Attributions	Contents
vx,vy,vz	R	Direction cosine of reference axis
area	R	Area of cross section
Iyy, Izz	R	Second moment of cross section
Jx	R	Torsion constant of cross section

In the case of [TYPE=INTERFACE]

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

Parameter Name	Attributions	Contents
`THICKNESS`	R	Cross-sectional thickness
`GAPCON`	R	Gap heat transfer coefficient (0 when omitted)
`GAPRAD1`	R	Gap radiant heat transfer factor-1 (0 when omitted)
`GAPRAD2`	R	Gap radiant heat transfer factor-2 (0 when omitted)

TYPE=INTERFACE is used not only for interface elements (541) but also for connector elements (511), which represent springs and dashpots. For a connector element, THICKNESS is not used in the stiffness and damping computation because the element has no cross section. The 2nd line itself, however, cannot be omitted and a positive value must be given (1.0 is sufficient). GAPCON, GAPRAD1 and GAPRAD2 are parameters for heat transfer and are not used for connector elements.

For a connector element, give as MATERIAL the name of a material whose spring constant or damping coefficient is defined by !SPRING_A / !SPRING_D / !DASHPOT_A / !DASHPOT_D under !MATERIAL in the cnt file.

Note:

When the parameter "TYPE" is not consistent with the element type, an error will occur.

When there is an element without SECTION information, an error will occur.

When the section name is duplicated, an error will occur.

Example of Use

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

An example of giving a section to connector elements (element type 511). When they are mixed with solid elements, define a separate section for each element group.

!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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