*MAT_026 (HONEYCOMB)

LS-DYNA Input Interface KeywordThis keyword defines an orthotropic compressible honeycomb material.

Format

(1) (2) (3) (4) (5) (6) (7) (8)
*MAT_026 or *MAT_HONEYCOMB
mat_ID ρ i
LC1 LC2 LC3 LCS LC12 LC23 LC31 LCSR
EAAU EBBU ECCU GABU GBCU GCAU AOPT
A1 A2 A3
D1 D2 D3 TSEF SSEF

Definition

Field Contents SI Unit Example
mat_ID Material identifier.

(Integer)

ρ i Initial density.

(Real)

[ kg m 3 ]
LC1 Stress versus either relative volume or volumetric strain in direction 1.

(Real)

[ Pa ]
LC2 Stress versus either relative volume or volumetric strain in direction 2.

(Real)

[ Pa ]
LC3 Stress versus either relative volume or volumetric strain in direction 3.

(Real)

[ Pa ]
LCS Shear stress versus either relative volume or volumetric strain.

(Real)

[ Pa ]
LC12 Shear stress versus shear strain in direction 12.

(Real)

[ Pa ]
LC23 Shear stress versus shear strain in direction 23.

(Real)

[ Pa ]
LC31 Shear stress versus shear strain in direction 31.

(Real)

[ Pa ]
LCSR Scaling coefficients for stress versus strain rate.

(Real)

LC31 Shear stress versus either relative volume or volumetric strain in direction 31.

(Real)

[ Pa ]
E11 Young's modulus in direction 1.

(Real)

[ Pa ]
E11 Young's modulus in direction 2.

(Real)

[ Pa ]
E11 Young's modulus in direction 3

(Real)

[ Pa ]
G12 Shear modulus in direction 12.

(Real)

[ Pa ]
G23 Shear modulus in direction 23.

(Real)

[ Pa ]
G32 Shear modulus in direction 32.

(Real)

[ Pa ]
AOPT Orthotropy axis option.
= 2
Orthotropy axis determined by A1, A2, A3, D1, D2, D3.
< 0
AOPT is number of *DEFINE_COORDINATE_* to define orthotropic system.

(Integer)

A1, A2, A3 First orthotropy direction vector for AOPT=2.

(Real)

D1, D2, D3 With A1, A2, A3 determines 12 plane of orthotropy for AOPT=2.

(Real)

TSEF Tensile strain to failure.

(Real)

SSEF Shear strain to failure.

(Real)

Comments

  1. This material law maps to /MAT/LAW50 (VISC_HONEY) and /PROP/TYPE6 (SOL_ORTH).
  2. The material is fully compressible. All degrees of freedom are decoupled.
  3. Curves in directions 1, 2, 3 are engineering stresses as functions of either volumetric strain, which means the first abscissa point is negative or relative volume (the first abscissa point is positive).
  4. Positive stresses and strains correspond to compression in direction 1, 2, 3.
  5. 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.