*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 (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 = 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
= 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)

$\left[\text{m}\right]$
A Section area

(Real)

$\left[{\text{m}}^{2}\right]$
IYY, IZZ Area moment of inertia for bending

(Real)

$\left[{\text{m}}^{4}\right]$
IXX Area moment of inertia for torsion

(Real)

$\left[{\text{m}}^{4}\right]$
VOL Discrete beam volume

(Real)

$\left[{\text{m}}^{3}\right]$
INERTIA Discrete mass beam inertia

(Real)

$\left[\text{kg}\cdot {\text{m}}^{\text{2}}\right]$
CID Coordinate system identifier for DOF directions of the discrete beams

(Integer)

AREA Section area of cable elements that use *MAT_071

(Real)

$\left[{\text{m}}^{2}\right]$