/MAT/LAW0 (VOID)

Block Format Keyword This material can be used to define elements to act as a void, or an empty space.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/MAT/LAW0/`mat_ID`/`unit_ID` or /MAT/VOID/`mat_ID`/`unit_ID`
`mat_title`

Optional

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
$ρ$		`E`		$υ$

Definitions

Field	Contents	SI Unit Example
`mat_ID`	Material identifier (Integer, maximum 10 digits)
`unit_ID`	Unit Identifier (Integer, maximum 10 digits)
`mat_title`	Material title (Character, maximum 100 characters)
$ρ$	Initial density (Real)	$[\frac{kg}{m^{3}}]$
`E`	Young's modulus (Real)	$[Pa]$
$υ$	Poisson's ratio (Real)

Example (Steel)

#RADIOSS STARTER
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/UNIT/1
unit for mat
                  Mg                  mm                   s
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#-  2. MATERIALS:
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/VOID/1/1
Void
#                RHO                   E                  Nu
             7.85E-9              210000                 0.3
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#ENDDATA
/END
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

Comments

Only law, mat_ID, and mat_title are used (refer to the keyword Materials).
This additional data allows defining contact interfaces with void material and property: all kinds of input for interfaces will then be available (I_gap =1, Stfac as a stiffness factor).
Contact stiffness will be correctly calculated only when E, $υ$ and t (thickness in property) are given.
When density of the void material is defined, the mass of the material is accounted in kinetic energy calculation.