*SECTION_BEAM

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

Format

(1) (2) (3) (4) (5) (6) (7) (8)
*SECTION_BEAM
sec_ID ELFORM   NIP CST
If ELFORM = 1, 4 (Integrated beam element), insert the following line.
(1) (2) (3) (4) (5) (6) (7) (8)
TS1
If ELFORM = 2 (Resultant beam element), insert the following line.
(1) (2) (3) (4) (5) (6) (7) (8)
A IYY IZZ IXX
If ELFORM = 2, 3 (Resultant beam element and truss element) with predefined circular section, insert the following line.
(1) (2) (3) (4) (5) (6) (7) (8)
SECTION_08 L1    


Figure 1.
If ELFORM = 2, 3 (Resultant beam element and truss element) with predefined rectangular section, insert the following line.
(1) (2) (3) (4) (5) (6) (7) (8)
SECTION_11 L2 L1  


Figure 2.
If ELFORM = 3 (Truss element), insert the following line.
(1) (2) (3) (4) (5) (6) (7) (8)
A      
If ELFORM = 6 (Discrete beam element), insert the following line.
(1) (2) (3) (4) (5) (6) (7) (8)
VOL INERTIA CID AREA

Definition

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).
= 2 (Default)
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 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 ]

Comments

  1. Converted into /PROP/TYPE3 (BEAM), /PROP/TYPE18 (INT_BEAM), /PROP/TYPE23 (SPR_MAT), or /PROP/TYPE2 (TRUSS).
  2. 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.