/MAT/LAW68 (COSSER)

Block Format Keyword

/MAT/LAW68 - Honeycomb Material

Description

This law describes the honeycomb material.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/MAT/LAW68/mat_ID/unit_ID or /MAT/COSSER/mat_ID/unit_ID
mat_title

E11		E22		E33
G12		G23		G31
fct_ID11i	fct_ID22i	fct_ID33i	Iflag1	Fscale11i		Fscale22i		Fscale33i
max11i		max22i		max33i
fct_ID12i	fct_ID23i	fct_ID31i	Iflag2	Fscale12i		Fscale23i		Fscale31i
max12i		max23i		max31i
fct_ID21i	fct_ID32i	fct_ID13i		Fscale21i		Fscale32i		Fscale13i
fct_ID11r	fct_ID22r	fct_ID33r		Fscale11r		Fscale22r		Fscale33r
trans11r		trans22r		trans33r
fct_ID12r	fct_ID23r	fct_ID31r		Fscale12r		Fscale23r		Fscale31r
trans12r		trans23r		trans31r
fct_ID21r	fct_ID32r	fct_ID13r		Fscale21r		Fscale32r		Fscale13r

Field	Contents	SI Unit Example
mat_ID	Material identifier (Integer, maximum 10 digits)
unit_ID	Optional unit identifier (Integer, maximum 10 digits)
mat_title	Material title (Character, maximum 100 characters)
	Initial density (Real)
E11	Young’s modulus (Real)
E22	Young’s modulus (Real)
E33	Young’s modulus (Real)
G12	Shear modulus (Real)
G23	Shear modulus (Real)
G31	Shear modulus (Real)
fct_ID11i	Initial yield stress function identifier in direction 11 (Integer)
fct_ID22i	Initial yield stress function identifier in direction 22 (Integer)
fct_ID33i	Initial yield stress function identifier in direction 33 (Integer)
Iflag1	Strain formulation for yield functions 11, 22, and 33 (Integer) = 0: yield stress is a function of (volumetric strains) = 1: yield stress is a function of (strains) = -1: yield stress is a function of -
Fscale11i	Initial yield stress scale factor on function 11 Default = 1.0 (Real)
Fscale22i	Initial yield stress scale factor on function 22 Default = 1.0 (Real)
Fscale33i	Initial yield stress scale factor on function 33 Default = 1.0 (Real)
max11i	Initial failure strain in tension in direction 1 (Real)
max22i	Initial failure strain in tension in direction 2 (Real)
max33i	Initial failure strain in tension in direction 3 (Real)
fct_ID12i	Initial shear yield stress function in direction 12 (Integer)
fct_ID23i	Initial shear yield stress function in direction 23 (Integer)
fct_ID31i	Initial shear yield stress function in direction 31 (Integer)
Iflag2	Strain formulation for shear yield functions 12, 23, and 31 (Integer)
Fscale12i	Initial shear yield stress scale factor on function 12 Default = 1.0 (Real)
Fscale23i	Initial shear yield stress scale factor on function 23 Default = 1.0 (Real)
Fscale31i	Initial shear yield stress scale factor on function 31 Default = 1.0 (Real)
max12i	Initial failure strain in direction 12 (Integer)
max23i	Initial failure strain in direction 23 (Integer)
max31i	Initial failure strain in direction 31 (Integer)
fct_ID21i	Initial shear yield stress function in direction 21 (Integer)
fct_ID32i	Initial shear yield stress function in direction 32 (Integer)
fct_ID13i	Initial shear yield stress function in direction 13 (Integer)
Fscale21i	Initial shear yield stress scale factor on function 21 Default = 1.0 (Real)
Fscale32i	Initial shear yield stress scale factor on function 32 Default = 1.0 (Real)
Fscale13i	Initial shear yield stress scale factor on function 13 Default = 1.0 (Real)
fct_ID11r	Residual yield stress function in direction 11 (Integer)
fct_ID22r	Residual yield stress function in direction 22 (Integer)
fct_ID33r	Residual yield stress function in direction 33 (Integer)
Fscale11r	Residual yield stress scale factor on function 11 Default = 1.0 (Real)
Fscale22r	Residual yield stress scale factor on function 22 Default = 1.0 (Real)
Fscale33r	Residual yield stress scale factor on function 33 Default = 1.0 (Real)
trans11r	Transition strain in direction 11 (Real)
trans22r	Transition strain in direction 22 (Real)
trans33r	Transition strain in direction 33 (Real)
fct_ID12r	Residual shear yield stress function in direction 12 (Integer)
fct_ID23r	Residual shear yield stress function in direction 23 (Integer)
fct_ID31r	Residual shear yield stress function in direction 31 (Integer)
Fscale12r	Residual shear yield stress scale factor on function 12 Default = 1.0 (Real)
Fscale23r	Residual shear yield stress scale factor on function 23 Default = 1.0 (Real)
Fscale31r	Residual shear yield stress scale factor on function 31 Default = 1.0 (Real)
trans12r	Transition strain in direction 12 (Integer)
trans23r	Transition strain in direction 23 (Integer)
trans31r	Transition strain in direction 31 (Integer)
fct_ID21r	Residual shear yield stress function in direction 21 (Integer)
fct_ID32r	Residual shear yield stress function in direction 32 (Integer)
fct_ID13r	Residual shear yield stress function in direction 13 (Integer)
Fscale21r	Residual shear yield stress scale factor on function 21 Default = 1.0 (Real)
Fscale32r	Residual shear yield stress scale factor on function 32 Default = 1.0 (Real)
Fscale13r	Residual shear yield stress scale factor on function 13 Default = 1.0 (Real)

#RADIOSS STARTER

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/UNIT/1

unit for mat

kg mm ms

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

#- 2. MATERIALS:

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/MAT/LAW68/1/1

honeycomb

# RHO_I

3.2E-5

# E_11 E_22 E_33

40 40 80

# G_12 G_23 G_31

15 30 30

# Initial tension/compression

#fct_ID11i fct_ID22i fct_ID33i Iflag1 Fscale11i Fscale22i Fscale33i

13 14 15 0 1 1 1

# Tension/compression

# Eps_max11i Eps_max22i Eps_max33i

.12 .12 .12

# Initial shear

#fct_ID12i fct_ID23i fct_ID31i Iflag2 Fscale12i Fscale23i Fscale31i

16 18 17 0 1 1 1

# Shear

# Eps_max12i Eps_max23i Eps_max31i

.14 .14 .14

# Initial shear

#fct_ID21i fct_ID32i fct_ID13i Fscale21i Fscale32i Fscale13i

16 18 17 0 0 0

# Residual tension/compression

#fct_ID11r fct_ID22i fct_ID33i Fscale11r Fscale22r Fscale33r

3 4 5 1 1 1

# Transition tension/compression

# Eps_trans11r Eps_trans22r Eps_trans33r

.022 .022 .022

# Residual shear

#fct_ID12r fct_ID23r fct_ID31r Fscale12r Fscale23r Fscale31r

6 8 7 1 1 1

# Transition shear

# Eps_trans12r Eps_trans23r Eps_trans31r

.041 .035 .035

# Residual shear

#fct_ID21r fct_ID32r fct_ID13r Fscale21r Fscale32r Fscale13r

7 7 8 0 0 0

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

#- 3. FUNCTIONS:

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FUNCT/3

sig11

# X Y

-100 .4

100 .4

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FUNCT/4

sig22

# X Y

-100 .4

100 .4

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FUNCT/5

sig33

# X Y

-100 .8

100 .8

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FUNCT/6

sig12

# X Y

-100 .3

100 .3

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FUNCT/7

sig13

# X Y

-100 .5

100 .5

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FUNCT/8

sig23

# X Y

-100 .5

100 .5

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FUNCT/13

sig11

# X Y

-100 .4

-.021 .4

-.02 .8

.02 .8

.021 .4

100 .4

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FUNCT/14

sig22

# X Y

-100 .4

-.021 .4

-.02 .8

.02 .8

.021 .4

100 .4

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FUNCT/15

sig33

# X Y

-100 .8

-.021 .8

-.02 1.6

.02 1.6

.021 .8

100 .8

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FUNCT/16

sig12

# X Y

-100 .3

-.041 .3

-.04 .6

.04 .6

.041 .3

100 .3

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FUNCT/17

sig13

# X Y

-100 .5

-.034 .5

-.033 1

.033 1

.034 .5

100 .5

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FUNCT/18

sig23

# X Y

-100 .5

-.034 .5

-.033 1

.033 1

.034 .5

100 .5

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

#ENDDATA

/END

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

1.	This law is compatible with 8-node brick elements, under integrated elements and Isolid =1 or Isolid =2 only.

2.	When switching from a volumetric strain formulation to a strain formulation, Iflag = -1 allows the same function definition to be retained.

3.	If one of the failure or shear failure strains is reached, the element is deleted.

4.	Transition strains define transition from initial to residual yield stress function.

5.	If one of the transition or shear transition strains is reached, element has yield stress described by residual functions, in each direction. Transition is applied to the neighbor elements.