*MAT_063 (CRUSHABLE_FOAM)

LS-DYNA Input Interface KeywordThis keyword defines a crushable foam material with optional tension cutoff and elastic unloading.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
*MAT_063 or *MAT_CRUSHABLE_FOAM
mat_ID	${\rho }_i$	E	$\nu$	Fct_ID	${\sigma }_{cutoff}$

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)	$\left[\text{Pa}\right]$
$\nu$	Poisson’s ratio. Default = 0 (Real)
Fct_ID	Yield stress as a function of volumetric strain function identifier. (Integer)
${\sigma }_{cutoff}$	Maximum tensile stress. (Real)	$\left[\text{Pa}\right]$

Comments

1. This keyword maps to /MAT/LAW33 (FOAM_PLAS).
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.