/FAIL/EMC

Block Format Keyword

/FAIL/EMC - Extended Mohr Coulomb Failure Model

Description

Describes failure dependent on effective plastic strain.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/FAIL/EMC/mat_ID/unit_ID
a		n		b0		c

Card 2

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)

Optional Line:

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
fail_ID

Field	Contents	SI Unit Example
mat_ID	Material identifier (Integer, maximum 10 digits)
unit_ID	Optional unit identifier (Integer, maximum 10 digits)
a	Hosford exponent Default = 1.0 (Real)
n	Stress state sensitivity exponent (Real)
b0	Strain to fracture for uni-axial tension (Comment 2) Default = 1.0 (Real)
c	Friction parameter for triaxiality Default = 0.0 (Real)
	Strain rate sensitivity parameter (Real)
	Reference strain rate Default = 1030 (Real)
fail_ID	(Optional) Failure criteria identifier (Comment 3) (Integer, maximum 10 digits)

Fracture parameters could be identified with tests like uniaxial tension (), pure shear (), and axisymmetric compression ().

#RADIOSS STARTER

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

/UNIT/1

unit for mat

Mg mm s

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

#- 2. MATERIALS:

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

/MAT/LAW84/1/1

Swift-voce (metal)

# RHO_I

8E-9

# E NU

206000. 0.30

# P12 P22 P33 QVOCE BVOCE

-0.5 1. 3. 524.0000 25.

# G11 G22 G33 K0 ALPHA

-0.5 1. 3. 100. 0.5

# AN EPS0 NN CEPSP DEPS0

1000. 0.00128 0.200 0.014 0.0011

# ETA CP TINI TREF TMELT

0.9 420e+8 293 293. 1700.

# MTEMP DEPSAD

0.921 1.379

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

/FAIL/EMC/1/1

# exponent_a exponent_n coef_b coef_c

1.9 0.2 0.20 0.0

# GAMA DEPS0

0.0 1.0

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

#ENDDATA

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

1.	The failure criteria is calculated as follows:

Where,

f1, f2 and f3 are functions of the Lode angle

With

Where, is the traixiality .

2.	The coefficient, b is computed as follows:

if else

3.	The fail_ID is used with /STATE/BRICK/FAIL and /INIBRI/FAIL for brick. There is no default value. If the line is blank, no value will be output for failure model variables in the /INIBRI/FAIL (written in .sta file with /STATE/BRICK/FAIL for brick).