*MAT_054 (ENHANCED_COMPOSITE_DAMAGE)

LS-DYNA Input Interface KeywordDefines an orthotropic shell composite material for unidirectional layers with Chang-Chang failure model.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)
MAT_054 or MAT_ENHANCED_COMPOSITE_DAMAGE
`mat_ID`	$ρ_{i}$	`E1`	`E2`	`E3`	$ν$ ₁₂
`G12`	`G23`	`G31`		`AOPT`
`XP`	`YP`	`ZP`	`A1`	`A2`	`A3`	`MANGLE`
`V1`	`V2`	`V3`	`D1`	`D2`	`D3`
`TFAIL`
`XC`	`XT`	`YC`	`YT`	`SC`		`BETA`
Blank card
Blank card
Blank card

Definition

Field	Contents	SI Unit Example
`mat_ID`	Material identifier. (Integer)
$ρ_{i}$	Initial density . (Real)	$[\frac{kg}{m^{3}}]$
`E1`	Young’s modulus in material directions 1. (Real)	$[Pa]$
`E2`	Young’s modulus in material directions 2. (Real)	$[Pa]$
`E3`	Young’s modulus in material directions 3. (Real)	$[Pa]$
$ν$ ₁₂	Poisson’s ratio between directions 1 and 2. (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`	Material axis flag. = 0 (Default) Orthotropic axes defined by element nodes. = 1 Orthotropic axes defined by the vector between reference point and the solid center. = 3 Orthotropic axes defined by Vector V and element normal vector. = 4 Orthotropic axes defined with reference point and normal to vector V. `AOPT` < 0 The absolute value `AOPT` is a coordinate system identifier which defines the orthotropic directions. (Integer)
`XP`, `YP`, `ZP`	Coordinates of reference point for `AOPT` = 1 and 4. (Real)
`A1`, `A2`, `A3`	Vector defining first orthotropy direction for `AOPT` = 2. (Real)
`MANGLE`	Material angle for `AOPT` = 1 and 3. (Real)
`V1`, `V2`, `V3`	A vector which in combination with element normal defines the first orthotropy direction for `AOPT` = 3 and 4. (Real)
`D1`, `D2`, `D3`	Components of vector for `AOPT` = 2. (Real)
`TFAIL`	Time step for element deletion. (Real)	$[s]$
`MANGLE`	Material angle for `AOPT` = 0 and 3. (Real)	$[\deg]$
`XT`	Yield stress in tension in direction 1. (Real)	$[Pa]$
`XC`	Yield stress in compression in direction 1. (Real)	$[Pa]$
`YT`	Yield stress in tension in direction 2. (Real)	$[Pa]$
`YC`	Yield stress in compression in direction 2. (Real)	$[Pa]$
`SC`	Maximum shear stress. (Real)	$[Pa]$
`BETA`	Shear scaling factor. Default = 0 (Real)

Comments

This material law is mapped to /MAT/LAW25 (COMPSH) (Iform=0) and /FAIL/CHANG.
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.