*SECTION_BEAM

LS-DYNA Input Interface KeywordDefines finite element property of beams, trusses, and discrete beams.

Format

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*SECTION_BEAM
`sec_ID`	`ELFORM`		`NIP`	`CST`

If ELFORM = 1, 4 (Integrated beam element), insert the following line.

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`TS1`

If ELFORM = 2 (Resultant beam element), insert the following line.

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`A`	`IYY`	`IZZ`	`IXX`

If ELFORM = 2, 3 (Resultant beam element and truss element) with predefined circular section, insert the following line.

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`SECTION_08`	`L1`

If ELFORM = 2, 3 (Resultant beam element and truss element) with predefined rectangular section, insert the following line.

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`SECTION_11`	`L2`	`L1`

If ELFORM = 3 (Truss element), insert the following line.

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`A`

If ELFORM = 6 (Discrete beam element), insert the following line.

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`VOL`	`INERTIA`	`CID`	`AREA`

Field	Contents	SI Unit Example
`sec_ID`	Section identifier. (Integer)
`ELFORM`	Beam element formulation. = 1 (Default) Integrated beam element. = 2 Resultant beam element. = 3 Truss element. = 4 Integrated beam element. = 6 Discrete beam element. (Integer)
`NIP`	Number of integration points (subsections). = 1 One integration point = 2 (Default) 22 Gauss quadrature = 3 33 Gauss quadrature = 4 33 Lobatto quadrature = 5 44 Lobatto quadrature (Integer)
`CST`	Cross section type. = 0 Square section. = 1 Circular section.
`TS1`	Cross section dimension. If `CST` = 0 Edge of square section. If `CST` = 1 Diameter of circular section. (Real)	$[m]$
`A`	Section area. (Real)	$[m^{2}]$
`IYY`, `IZZ`	Area moment of inertia for bending. (Real)	$[m^{4}]$
`IXX`	Area moment of inertia for torsion. (Real)	$[m^{4}]$
`VOL`	Discrete beam volume. (Real)	$[m^{3}]$
`INERTIA`	Discrete mass beam inertia. (Real)	$[kg \cdot m^{2}]$
`CID`	Coordinate system identifier for DOF directions of the discrete beams. (Integer)
`AREA`	Section area of cable elements that use *MAT_071. (Real)	$[m^{2}]$
`L1`, `L2`	Dimension of the predefined section. (Real)	$[m]$

Converted into /PROP/TYPE3 (BEAM), /PROP/TYPE18 (INT_BEAM), /PROP/TYPE23 (SPR_MAT), or /PROP/TYPE2 (TRUSS).
The option “_TITLE” can be added to the end of this keyword. When “_TITLE” is included, an extra 80 characters long line is added after the keyword input line which allows an entity title to be defined.