*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)	(8)
MAT_054 or MAT_ENHANCED_COMPOSITE_DAMAGE
`mat_ID`	$ρ_{i}$	`E1`	`E2`	`E3`	$ν$ ₁₂	$ν_{31}$	$ν_{32}$
`G12`	`G23`	`G31`		`AOPT`	`2WAY`	`TI`
`XP`	`YP`	`ZP`	`A1`	`A2`	`A3`	`MANGLE`
`V1`	`V2`	`V3`	`D1`	`D2`	`D3`	`DFAILM`	`DFAILS`
`TFAIL`	$α$		`FBRT`
`XC`	`XT`	`YC`	`YT`	`SC`		$β$
`RATIO`	`EPSF`	`EPSR`	`TSMD`
`SLIMT1`	`SLIMC1`	`SLIMT2`	`SLIMC2`	`SLIMSR`	`NCYRED`
`LCXC`	`LCXT`	`LCYC`	`LCYT`	`LSSC`

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 direction 1. (Real)	$[Pa]$
`E2`	Young’s modulus in material direction 2. (Real)	$[Pa]$
`E3`	Young’s modulus in material direction 3. (Real)	$[Pa]$
$ν$ ₁₂	Poisson’s ratio between directions 1 and 2. (Real)
$ν_{31}$	Poisson’s ratio between directions 3 and 1. (Real)
$ν_{32}$	Poisson’s ratio between directions 3 and 2. (Real)
`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)
`2WAY`	Flag to turn on 2-way fiber action. This option is available only for solid and thick shells. = 0 (Default) Standard unidirectional behavior, meaning fibers run only in the direction 1. = 1 2-way fiber behavior, meaning fibers run in both the first and second directions. The meaning of the fields `DFAILT`, `DFAILC`, `YC`, `YT`, `SLIMT2` and `SLIMC2` are altered if this flag is set. (Integer)
`TI`	Flag to turn on transversal isotropic behavior for material solid elements. = 0 (Default) Standard unidirectional behavior. = 1 Transversal isotropic behavior. (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)
`DFAILM`	Maximum strain for matrix straining in tension or compression (active only if `DFAILT` > 0). Default = 1E+10 (Real)
`DFAILS`	Maximum tensorial shear strain (active only if `DFAILT` > 0). Default = 1E+10 (Real)
`TFAIL`	Time step for element deletion. (Real)	$[s]$
$α$	Shear stress parameter for the nonlinear term. Default = 0.0 (Real)
`FBRT`	Softening factor for fiber tensile stress. = 0.0 Tensile stress is $σ_{T 1}$ . > 1.0 Tensile strength is $σ_{T 1}$ reduced by `FBRT` after failure occurred in compressive matrix mode. Default = 1.0 (Real)
`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)	$[Pa]$
$β$	Shear scaling factor. Default = 0 (Real)
`RATIO`	Percentage of layers which must fail before element deletion. (Real)
`EPSF`	Damage initiation transverse shear strain. Default = 1E+10 (Real)
`EPSR`	Final rupture transverse shear strain. Default = 2E+10 (Real)
`TSMD`	Transverse shear maximum damage. Default = 0.90 (Real)
`SLIMT1`	Factor to determine the minimum stress limit after stress maximum `XT` is reached. Default = 1.0 (Real)
`SLIMC1`	Factor to determine the minimum stress limit after stress maximum `XC` is reached. Default = 1.0 (Real)
`SLIMT2`	Factor to determine the minimum stress limit after stress maximum `YT` is reached. Default = 1.0 (Real)
`SLIMC2`	Factor to determine the minimum stress limit after stress maximum `YC` is reached. Default = 1.0 (Real)
`SLIMSR`	Factor to determine the minimum stress limit after stress maximum `SC`. Default = 1.0 (Real)
`NCYRED`	Number of cycles for stress reduction from maximum to minimum. Default = 1 (Integer)
`LCXC`	Load curve identifier defining the tensile stress in direction 1 `XC` as a function of strain rate. (Integer)
`LCXT`	Load curve identifier defining the tensile stress in direction 1 `XT` as a function of strain rate. (Integer)
`LCYC`	Load curve identifier defining the tensile stress in direction 1 `YC` as a function of strain rate. (Integer)
`LCYT`	Load curve identifier defining the tensile stress in direction 1 `YT` as a function of strain rate. (Integer)
`LSSC`	Load curve identifier defining the tensile stress in direction 1 `SC` as a function of strain rate. (Integer)

Comments

This material law is mapped to /MAT/LAW127 (ENHANCED_COMPOSITE) and /FAIL/GENE1.
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.