*MAT_S04 (SPRING_NONLINEAR_ELASTIC)

LS-DYNA Input Interface KeywordThis keyword defines a nonlinear elastic spring material.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
*MAT_S04 or *MAT_SPRING_NONLINEAR_ELASTIC
mat_ID	LCL	LCR

Definition

Field	Contents	SI Unit Example
mat_ID	Material identifier (Integer)
LCL	Curve identifier for force vs displacement or moment vs rotation (Integer)	$\left[\frac{\text{N}}{\text{m}}\right]$ or $\left[\frac{\text{N}•\text{m}}{\text{rad}}\right]$
LCR	Curve identifier for the scale factor of force vs elongation velocity or moment vs rotational velocity (Real)

Comments

1. This keyword maps to /PROP/TYPE8 (SPR_GENE) spring using a default mass 2.0e-03 kg and inertia 2e-02 kg * mm depending on units.
2. 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.