*MAT_066 (LINEAR_ELASTIC_DISCRETE_BEAM)

LS-DYNA Input Interface KeywordThis keyword defines a linear elastic discrete beam material with 6 decoupled degrees of freedom and an optional preload option.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
*MAT_066 or *MAT_LINEAR_ELASTIC_DISCRETE_BEAM
mat_ID	${\rho }_i$	TK_r	TK_s	TK_t	RK_r	RK_s	RK_t
TD_r	TD_s	TD_t	RD_r	RD_s	RD_t
FO_r	FO_s	FO_t	MO_r	MO_s	MO_t

Definition

Field	Contents	SI Unit Example
mat_ID	Material identifier (Integer)
${\rho }_i$	Initial density (Real)	$\left[\frac{\text{kg}}{{\text{m}}^{\text{3}}}\right]$
TK_r, TK_s, TK_t	Stiffness in directions r, s, t (Real)	$\left[\frac{\text{N}}{\text{m}}\right]$
RK_r, RK_s, RK_t	Rotational stiffness for axis r, s, t (Real)	$\left[\frac{\text{Nm}}{\text{rad}}\right]$
TD_r, TD_s, TD_t	Damping in directions r, s, t (Real)	$\left[\frac{\text{N • s}}{\text{m}}\right]$
RD_r, RD_s, RD_t	Rotational damping in directions r, s, t (Real)	$\left[\frac{\text{Nms}}{\text{rad}}\right]$
FO_r, FO_s, FO_t	Force preload in directions r, s, t (Real)	$\left[\text{N}\right]$
MO_r, MO_s, MO_t	Moment preload in directions r, s, t (Real)	$\left[\mathrm{N}\cdot \mathrm{m}\right]$

Comments

1. This keyword maps to /MAT/LAW108 (SPR_GENE).
2. The material is only used with *SECTION_BEAM, ELFORM = 6 discrete beam elements.
3. Beams with zero initial length are recommended.
4. The option “_TITLE” can be added to the end of this keyword. When “_TITLE” is included, an extra 80 character long line is added after the keyword input line which allows an entity title to be defined.