*MAT_126 (MODIFIED_HONEYCOMB)

LS-DYNA Input Interface KeywordThis model expresses a three-dimension orthotropic nonlinear elasto-plastic material, usually used to model honeycomb or foam material.

Format

(1) (2) (3) (4) (5) (6) (7) (8)
*MAT_126 or *MAT_MODIFIED_HONEYCOMB
mat_ID ρ i            
fct_ID11 fct_ID12 fct_ID33   fct_ID12 fct_ID23 fct_ID31 fctIDsr
E11 E22 E33 G12 G23 G31 AOPT  
      A1 A2 A3    
D1 D2 D3          

Definition

Field Contents SI Unit Example
mat_ID Material identifier

(Integer)
ρ i Initial density

(Real)

 [ kg m 3 ]
fct_ID11 Curve Identifier of yield stress function in direction 11.

(Integer)
fct_ID22 Curve Identifier of yield stress function in direction 22.

(Integer)
fct_ID33 Curve Identifier of yield stress function in direction 33.

(Integer)
fct_ID12 Curve Identifier of yield stress function in direction 12.

(Integer)
fct_ID23 Curve Identifier of yield stress function in direction 23.

(Integer)
fct_ID31 Curve Identifier of yield stress function in direction 31.

(Integer)
fctIDsr Curve identifier defining the strain rate yield scale factor versus strain rate.

(Integer)
E11 Young's modulus in direction 1.

(Real)

 [ Pa ]
E22 Young's modulus in direction 2.

(Real)

 [ Pa ]
E33 Young's modulus in direction 3.

(Real)

 [ Pa ]
G12 Shear modulus in direction 12.

(Real)

 [ Pa ]
G23 Shear modulus in direction 23.

(Real)

 [ Pa ]
G31 Shear modulus in direction 31.

(Real)

 [ Pa ]
AOPT Choice of orthotropy axis
< 0
|AOPT| is the coordinate system identifier of *DEFINE_COORDINATE_* used to define the orthotropic direction
=2
orthotropy axis determined by A1, A2, A3, D1, D2, D3

(Integer)
A1, A2, A3 First orthotropy direction vector for AOPT = 2

(Real)
D1, D2, D3 Vector components used with A1, A2, A3 to determine the 12 plane of orthotropy for AOPT = 2

(Real)

Comments

  1. This keyword maps to /MAT/LAW50 (VISC_HONEY), /PROP/TYPE6 (SOL_ORTH), and /SKEW/FIX.
  2. 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.