LS-DYNA Input Interface KeywordThis keyword defines an isotropic, visco-elastic material. It is generally used to model incompressible rubbers, polymers, foams, and elastomers.


(1) (2) (3) (4) (5) (6) (7) (8)
mat_ID ρ i K G0 G_INF BETA


Field Contents SI Unit Example
mat_ID Material identifier


ρ i Initial density


[ kg m 3 ]
K Bulk coefficient


[ Pa ]
G0 Short time shear modulus


[ Pa ]
G_INF Long time shear modulus


[ Pa ]
BETA Decay coefficient


[ 1 s ]


  1. This keyword maps to /MAT/LAW42 (OGDEN). It is compatible with shells and solids.
  2. Parameters K, G0, and G_INF are required.
  3. Inputting material parameters as a function of temperature is not supported.
  4. 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.