/FAIL/WIERZBICKI
Block Format Keyword Describes the BAOXUEWierzbicki failure model.
Format
(1)  (2)  (3)  (4)  (5)  (6)  (7)  (8)  (9)  (10) 

/FAIL/WIERZBICKI/mat_ID/unit_ID  
C_{1}  C_{2}  C_{3}  C_{4}  m  
n  I_{fail_sh}  I_{fail_so}  I_{moy} 
(1)  (2)  (3)  (4)  (5)  (6)  (7)  (8)  (9)  (10) 

fail_ID 
Definition
Field  Contents  SI Unit Example 

mat_ID  Material
identifier. (Integer, maximum 10 digits) 

unit_ID  Unit Identifier. (Integer, maximum 10 digits) 

C_{1}  1st
parameter. (Real) 

C_{2}  2nd
parameter. (Real) 

C_{3}  3rd
parameter. (Real) 

C_{4}  4th
parameter. (Real) 

m  5th
parameter. (Real) 

n  Hardening
exponent. (Real) 

I_{fail_sh}  Shell failure model flag.
(Integer) 

I_{fail_so}  Brick failure model flag.
(Integer) 

I_{moy}  Failure 3D model
(brick) flag.
(Integer) 

fail_ID  Failure criteria identifier. 2 (Integer, maximum 10 digits) 
Example (Metal)
#RADIOSS STARTER
#12345678910
/UNIT/1
unit for mat
# MUNIT LUNIT TUNIT
Mg mm s
#12345678910
# 1. MATERIALS:
#12345678910
/MAT/PLAS_JOHNS/1/1
Metal
# RHO_I
2.8E9 0
# E Nu
60000 .3
# a b n EPS_p_max SIG_max0
370 190 .4 0 0
# c EPS_DOT_0 ICC Fsmooth F_cut Chard
0 0 0 0 0 0
# m T_melt rhoC_p T_r
0 0 0 0
/FAIL/WIERZBICKI/1/1
# C1 C2 C3 C4 m
0.87 1.77 0.21 0.56 2
# n Ifail_sh Ifail_so Imoy
0.2 0 1 0
#12345678910
#enddata
#12345678910
Comments
 For
${\overline{\epsilon}}_{f}$
which is used in failure flag is:
(1) $${\overline{\epsilon}}_{f}={\left\{{\overline{\epsilon}}_{\mathrm{max}}{}^{n}\left[{\overline{\epsilon}}_{\mathrm{max}}{}^{n}{\overline{\epsilon}}_{\mathrm{min}}{}^{n}\right]{\left(1{\overline{\xi}}^{m}\right)}^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{1ex}{$m$}\right.}\right\}}^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{1ex}{$n$}\right.}$$Where,
${\overline{\epsilon}}_{\mathrm{max}}={C}_{1}{e}^{{C}_{2}\overline{\eta}}$
${\overline{\epsilon}}_{\mathrm{min}}={C}_{3}{e}^{{C}_{4}\overline{\eta}}$
For Brick: If I_{moy} = 0
 $\overline{\eta}=\frac{{\sigma}_{m}}{{\sigma}_{VM}}$ $\overline{\xi}=\frac{27{J}_{3}}{2{\sigma}_{VM}^{3}}$
 If I_{moy} = 1
 $\overline{\eta}=\frac{{\displaystyle {\int}_{0}^{{\epsilon}_{p}}\frac{{\sigma}_{m}}{{\sigma}_{VM}}d{\epsilon}_{p}}}{{\epsilon}_{p}}$ ; $\overline{\xi}=\frac{{\displaystyle {\int}_{0}^{{\epsilon}_{p}}\frac{27{J}_{3}}{2{\sigma}_{VM}^{3}}}d{\epsilon}_{p}}{{\epsilon}_{p}}$
For Shell: $\overline{\eta}=\frac{{\sigma}_{m}}{{\sigma}_{VM}}$ ; $\overline{\xi}=\frac{27}{2}\overline{\eta}\left({\overline{\eta}}^{2}\frac{1}{3}\right)$
Where, ${\sigma}_{m}$
 Hydrostatic stress
 ${\sigma}_{VM}$
 von Mises stress
 ${J}_{3}$
 Third invariant deviatoric stress
 The fail_ID is used with /STATE/BRICK/FAIL and /INIBRI/FAIL. 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 option).