*MAT_196 (GENERAL_SPRING_DISCRETE_BEAM)

LS-DYNA Input Interface KeywordDefines a nonlinear elasto-plastic discrete beam material with 6 degrees of freedom.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
MAT_196 or MAT_GENERAL_SPRING_DISCRETE_BEAM
`mat_ID`	$ρ_{i}$

For each degree of freedom defined 1- 6, enter the following 2 cards.

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
`DOF`	`TYPE`	`K`	`D`	`FC`	`FT`
`LCF`	`LCD`	`C1`	`C2`	`V0`

Field	Contents	SI Unit Example
`mat_ID`	Material identifier. (Integer)
$ρ_{i}$	Initial density. (Real)	$[\frac{kg}{m^{3}}]$
`DOF`	Degree of freedom. 1 through 6. (Integer)
`TYPE`	Material type. 0 Elastic. 1 Elasto-plastic. (Integer)
`K`	Stiffness. (Real)	$[\frac{N}{m}]$
`D`	Viscous damping coefficient. (Real)	$[\frac{N • s}{m}]$
`FC`	Failure elongation in compression input as a positive value. (Real)	$[m]$
`FT`	Failure elongation in tension input as a positive value. (Real)	$[m]$
`LCF`	If `TYPE`=0 Force vs displacement curve identifier. If `TYPE`=1 Force vs plastic displacement curve identifier. This input is required. (Integer)
`LCD`	Optional damping force vs velocity curve identifier. (Integer)
`C1`, `C2`	Nonlinear damping coefficients. (Real)
`V0`	Reference velocity for nonlinear damping. (Real)	$[\frac{m}{s}]$

This keyword maps to /MAT/LAW108 (SPR_GENE) with an equivalent number of degrees of freedom (DOF).
DOF directions are defined by the coordinate system defined in *SECTION_BEAM. By default, the global coordinate system is used.
This material is only used with discrete beams ELFORM=6 and CA>0 in *SECTION_BEAM.
Beam elements with zero initial length are recommended.
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.