*MAT_027 (MOONEY-RIVLIN_RUBBER)

LS-DYNA Input Interface KeywordDefines a Mooney-Rivlin isotropic hyperelastic incompressible material.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
*MAT_027 or *MAT_MOONEY-RIVLIN_RUBBER
mat_ID	${\rho }_i$	$\upsilon$	A	B
Length	Width	Thickness	LCID

Definition

Field	Contents	SI Unit Example
mat_ID	Material identifier. (Integer)
${\rho }_i$	Initial density. (Real)	$\left[\frac{\text{kg}}{{\text{m}}^{\text{3}}}\right]$
A, B	Mooney-Rivlin Material constants. (Real)
$\upsilon$	Poisson’s ratio. (Real)	$\left[\text{Pa}\right]$
Length	Sample length. (Real)	$\left[\text{m}\right]$
Width	Sample width. (Real)	$\left[\text{m}\right]$
Thickness	Sample thickness. (Real)	$\left[\text{m}\right]$
LCID	Function identifier of Force versus elongation. (Integer)	$\left[\text{N}\right]$

Comments

1. This maps to /MAT/LAW69, if LCID is defined otherwise it maps to /MAT/LAW42 (OGDEN).
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.