/MAT/LAW72 (HILL

Block Format Keyword

/MAT/LAW72 - Anisotropic Hill Material Law with MMC Fracture Model

Description

This law describes the anisotropic hill material with a modified Mohr fracture criteria. This law is available for shell and solid.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/MAT/LAW72/mat_ID/unit_ID or /MAT/HILL_MMC/mat_ID/unit_ID
mat_title

E
				n		F		G
H		N		L		M
C1		C2		C3		m		Dc

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)
E	Initial Young’s modulus (Real)
	Poisson’s ratio (Real)
	Initial yield stress Default = 1030 (Real)
	Initial plastic strain (Real)
n	Exponent for isotropic function given by: (Real)
F, G, H, L, M, N	Six Hill anisotropic parameters (float)
C1	First parameter for MMC fracture model (Real)
C2	Second parameter for MMC fracture model (Real)
C3	Third parameter for MMC fracture model (Real)
m	Exponent for softening function (Comment 3) (Real)
Dc	Critical damage Default = 1 (Real) = 1: The element is deleted when damage reach one. > 1: The yield stress is modified by using a softening function (Comment 3) If damage reaches the critical damage value, the element is deleted.

(Metal)

#RADIOSS STARTER

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

/UNIT/1

unit for mat

g 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/LAW72/1/1

Metal

# RHO_I

0.0028

# E NU

200E+3 0.3

# Sig0 EPS0 n F G

1276 1.63E-3 0.265 0.5 0.5

# H N L M

0.5 1.5 0 0

# C1 C2 C3 m Dc

0.12 720 1.095 0.5 1.1

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

#ENDDATA

/END

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

1.	3D equivalent Hill stress:

For shell element, take:

2.	MMC fracture criteria:

•	Anisotropic 3D model

While,

is Lode angle

with Lode angle parameter

is the third invariant of the deviatoric stress.

is stress triaxiality with

•	2D Anisotropic Model

with,

3.	Fracture and damage with MMC fracture criteria:

•	When D = 1: fracture initiate

•	By 1 < D < Dc : the yield stress is multiplied by softening function to reduce the deformation resistance.

with

•	If D > Dc, the element is deleted.

4.	It is possible to display user variables in animation files (with Engine /ANIM/Eltyp/Restype) and in Time history file (with Starter /TH/SHEL and /TH/BRIC):

USER1: Plastic strain

USER2: Damage value

/MAT/LAW72 (HILL_MMC)

/MAT/LAW72 (HILL_MMC)

/MAT/LAW72 (HILL_MMC)

Description