/FAIL/EMC
Block Format Keyword 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 |
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
fail_ID |
Definitions
Field | Contents | SI Unit Example |
---|---|---|
mat_ID | Material identifier. (Integer, maximum 10 digits) |
|
unit_ID | 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. 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. 3 (Integer, maximum 10 digits) |
Example (Metal)
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----|
Comments
- The failure
criteria is calculated as:
(1) Where,(2) Where,(3) Where, , and are functions of the Lode angle :(4) (5) (6) With(7) Where, is the traixiality .
- The
coefficient, b is computed as:
if else
- 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).