*MAT_006 (VISCOELASTIC)

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

Format

(1) (2) (3) (4) (5) (6) (7) (8)
*MAT_006 or *MAT_VISCOELASTIC
mat_ID ρ i K G0 G_INF BETA

Definition

Field Contents SI Unit Example
mat_ID Material identifier.

(Integer)

ρ i Initial density.

(Real)

[ kg m 3 ]
K Bulk coefficient.

(Real)

[ Pa ]
G0 Short time shear modulus.

(Real)

[ Pa ]
G_INF Long time shear modulus.

(Real)

[ Pa ]
BETA Decay coefficient.

(Real)

[ 1 s ]

Comments

  1. This keyword maps to /MAT/LAW34 (BOLTZMAN). It is compatible with truss, beam shell and solid elements.
  2. Parameters K, G0, and G_INF are required.
  3. Input of 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 characters long line is added after the keyword input line which allows an entity title to be defined.