*MAT_077_H (HYPERELASTIC_RUBBER)

LS-DYNA Input Interface KeywordDefines an isotropic, hyperelastic, viscous, and incompressible material specified from uniaxial experimental data.

Format

(1) (2) (3) (4) (5) (6) (7) (8)
*MAT_077_H or *MAT_HYPERELASTIC_RUBBER
mat_ID ρ i ν MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8WjY=vipgYlh9vqqj=hEeeu0xXdbb a9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9q8qqaq=dir=f0=yq aiVgFr0xfr=xfr=xb9adbaGaaiGadiWaamaaceGaaqaacaqbaaGcba GaeqyVd4gaaa@3A61@    
If N = 0
(1) (2) (3) (4) (5) (6) (7) (8)
C10 C01 C11 C20 C02 C30    
If N > 0
(1) (2) (3) (4) (5) (6) (7) (8)
SGL SW ST Fct_ID
In all cases, add up to 12 lines.
(1) (2) (3) (4) (5) (6) (7) (8)
Gi β i    

Definition

Field Contents SI Unit Example
mat_title Material identifier.

(Integer)
ρ i Initial density.

(Real)

 [ kg m 3 ]
ν MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8WjY=vipgYlh9vqqj=hEeeu0xXdbb a9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9q8qqaq=dir=f0=yq aiVgFr0xfr=xfr=xb9adbaGaaiGadiWaamaaceGaaqaacaqbaaGcba GaeqyVd4gaaa@3A61@ Poisson’s ratio.

Default = 0.495 (Real)
C10, C01, C11, C20, C02, C30 Shear hyperelastic modulus parameter.

(Real)

 [ Pa ]
SGL Specimen gauge length. [ m ]
SW Specimen width length. [ m ]
ST Specimen thickness. [ m ]
Fct_ID Force versus gauge length function identifier.
Compression
Defined in the 3rd quadrant (negative).
Tensile
Defined in the 1st quadrant (positive).

(Integer)

 [ N m ]
Gi Shear modulus for relaxation. [ Pa ]
β i Decay constant for relaxation. [ 1 s ]

Comments

  1. This keyword maps to /MAT/LAW59 (CONNECT) (if N = 0) or /MAT/LAW69 (if N > 0) and /VISC/PRONY in case when Prony coefficients are available.
  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.