*MAT_092 (SOFT_TISSUE_VISCO)

LS-DYNA Input Interface KeywordThis material is used to represent biological soft tissues such as ligaments based on Mooney-Rivlin formulation.

Visco-elasticity is modeled using Prony series.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
*MAT_092 or *MAT_SOFT_TISSUE_VISCO
mat_ID	${\rho }_i$	mu_1	mu_2
G1	G2	G3	G4	G5	G6
tau_1	tau_2	tau_3	tau_4	tau_5	tau_6

Definition

Field	Contents	SI Unit Example
mat_ID	Material identifier. (Integer)
${\rho }_i$	Initial density. (Real)	$\left[\frac{\text{kg}}{{\text{m}}^{\text{3}}}\right]$
mu_1 - mu_2	Mooney-Rivlin coefficient. (Real)	$\left[\text{Pa}\right]$
G1 - G6	Prony viscous terms. (Real)	$\left[\text{Pa}\right]$
tau_1 - tau_6	Relaxation time corresponding to each Prony term Gi.	$\left[\text{s}\right]$

Comments

1. This keyword 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.