*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)	$[\frac{kg}{m^{3}}]$
`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

This material law maps to /MAT/LAW50 (VISC_HONEY) and /PROP/TYPE6 (SOL_ORTH).
The material is fully compressible. All degrees of freedom are decoupled.
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).
Positive stresses and strains correspond to compression in direction 1, 2, 3.
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.