*MAT_083 (FU_CHANG_FOAM)

LS-DYNA Input Interface KeywordThis keyword defines an isotropic, highly compressible Fu Chang foam.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
*MAT_083 or *MAT_FU_CHANG_FOAM
mat_ID	${\rho }_i$	E					TBID
							HU
							SHAPE

Definition

Field	Contents	SI Unit Example
mat_ID	Material identifier (Integer)
${\rho }_i$	Initial density (Real)	$\left[\frac{\text{kg}}{{\text{m}}^{\text{3}}}\right]$
E	Young’s modulus (Real)	$\left[\text{Pa}\right]$
TBID	Table identifier for engineering stress vs engineering strain for different strain rates. Positive strains and stresses correspond to compression (Real)
HU	Hysteresis unloading factor 0<HU<1 (Real)
SHAPE	Shape unloading factor (Real)

Comments

1. This keyword maps to /MAT/LAW90.
2. The unloading follows the first loading curve when HU=0. For HU>0, the first loading curve is used to calculate the unloading path based on a damage formulation.
3. 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.