/FAIL/FABRIC
Block Format Keyword Describes an anisotropic strain failure model for fibers of fabric material.
Format
(1)  (2)  (3)  (4)  (5)  (6)  (7)  (8)  (9)  (10) 

/FAIL/FABRIC/mat_ID/unit_ID  
${\epsilon}_{f1}$  ${\epsilon}_{r1}$  ${\epsilon}_{f2}$  ${\epsilon}_{r2}$  
fct_ID 
(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) 

${\epsilon}_{f1}$  Failure tensile strain in
direction 1. Default = 1.0E20 (Real) 

${\epsilon}_{r1}$  Rupture tensile strain in
direction 1. Default = 2.0E20 (Real) 

${\epsilon}_{f2}$  Failure tensile strain in
direction 2. Default = 1.0E20 (Real) 

${\epsilon}_{r2}$  Rupture tensile strain in
direction 2. Default = 2.0E20 (Real) 

fct_ID  Function identifier of
$\mathrm{f}\left(\dot{\epsilon}\right)$
. It is function of scale factor for
tensile strain limits in both direction vs. corresponding strain
rates. (Integer) 

fail_ID  Failure criteria identifier. (Integer, maximum 10 digits) 
Example (Fabric)
#RADIOSS STARTER
#12345678910
/UNIT/1
unit for mat
kg mm ms
#12345678910
# 2. MATERIALS:
#12345678910
/MAT/LAW58/1/1
Altair test fabric LAW58
# RHO_I
8e07
# E1 B1 E2 B2 FLEX
0.38 0 0.38 0 1
# G0 GT AlphaT Gsh sensor_ID
0.0035 0.0055 7.175 0 1
# Df Ds GFROT ZERO_STRESS
0.00 0.00 0 1
# N1 N2 S1 S2 FLEX1 FLEX2
1 1 0 0 0 0
# fct_ID1 Fscale1
500 1
# fct_ID2 Fscale2
501 1.07
# fct_ID3 Fscale3
502 1
#12345678910
# FCT_ID4 FCT_ID5 Fscale4 Fscale5 FCT_ID6 Fscale6
600 600 1 1 502 1
#12345678910
/FAIL/FABRIC/1/1
# EPS_f1 EPS_r1 EPS_f1 EPS_r1
0.2 0.5 0.2 0.5
# Fct_ID
0
#12345678910
/FUNCT/500
stressstrain curve dir 1
# true strain true stress
0.0e+000 0
1.0e002 2.9343e003
2.0e002 5.2630e003
3.0e002 6.9235e003
4.0e002 8.4176e003
5.0e002 1.0120e002
6.0e002 1.2102e002
7.0e002 1.4219e002
8.0e002 1.6595e002
9.0e002 1.9202e002
1.0e001 2.2040e002
1.1e001 2.5270e002
1.2e001 2.8711e002
1.3e001 3.2558e002
1.4e001 3.6676e002
1.5e001 4.1031e002
1.6e001 4.5697e002
/FUNCT/501
stressstrain curve dir 2
# true strain true stress
0.0e+000 0
1.0e002 3.7475e003
2.0e002 6.4746e003
3.0e002 8.6433e003
4.0e002 1.0769e002
5.0e002 1.2923e002
6.0e002 1.5325e002
7.0e002 1.8090e002
8.0e002 2.1231e002
9.0e002 2.4870e002
1.0e001 2.8884e002
1.1e001 3.3246e002
1.2e001 3.8027e002
1.3e001 4.3127e002
1.4e001 4.8519e002
1.5e001 5.4217e002
1.6e001 6.0077e002
#12345678910
/FUNCT/502
stressstrain curve dir 12
# angle true stress
16.170000000e000 1.5741500000e003
7.1750000000e000 4.3750000000e004
0.0000000000e+000 0.0000000000e+000
7.1750000000e000 4.3750000000e004
16.170000000e000 1.5741500000e003
/FUNCT/600
unloading stressstrain curve dir 1, 2
# X Y
0.0e+000 0.0e+000
2.0e002 5.0e004
4.0e002 1.0e003
6.0e002 2.0e003
8.0e002 5.0e003
1.0e001 1.0e002
1.2e001 3.0e002
1.4e001 7.0e002
#ENDDATA
/END
#12345678910
Comments
 The failure criteria is only compatible with fabric material /MAT/LAW58 (FABR_A).
 Failure and damage is defined
independently in each direction (
$i$
=1,2), if:
(1) $${\epsilon}_{i}\ge {\epsilon}_{fi}\Rightarrow {D}_{i}=\frac{{\epsilon}_{i}{\epsilon}_{fi}}{{\epsilon}_{ri}{\epsilon}_{fi}}$$Where, ${\epsilon}_{i}$ is the fiber tensile strain.
The fiber stress will be reduced by:(2) $${\sigma}_{i}={\sigma}_{i}\cdot \left(1{D}_{i}\right)$$  Element deletion could also be controlled by P_thickfail in /PROP/TYPE16.
 The fail_ID is used with /STATE/SHELL/FAIL and /INISHE/FAIL. There is no default value. If the line is blank, no value will be output for failure model variables in the /INISHE/FAIL (written in .sta file with /STATE/SHELL/FAIL option).
 Element will be deleted only if damage values in both directions reach limit values D= 1.0 in all integration points. Maximum damage value D can be observed by using /ANIM/SHELL/DAMA and /H3D/SHELL/DAMA/NPT=ALL in Engine.