/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 | |||||||||
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) |
|
Failure tensile strain in
direction 1. Default = 1.0E30 (Real) |
||
Rupture tensile strain in
direction 1. Default = 2.0E30 (Real) |
||
Failure tensile strain in
direction 2. Default = 1.0E30 (Real) |
||
Rupture tensile strain in
direction 2. Default = 2.0E30 (Real) |
||
fct_ID | Function identifier of
. 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
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/UNIT/1
unit for mat
kg 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/LAW58/1/1
Altair test fabric LAW58
# RHO_I
8e-07
# 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
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
# FCT_ID4 FCT_ID5 Fscale4 Fscale5 FCT_ID6 Fscale6
600 600 1 1 502 1
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/FAIL/FABRIC/1/1
# EPS_f1 EPS_r1 EPS_f1 EPS_r1
0.2 0.5 0.2 0.5
# Fct_ID
0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/FUNCT/500
stress-strain curve dir 1
# true strain true stress
0.0e+000 0
1.0e-002 2.9343e-003
2.0e-002 5.2630e-003
3.0e-002 6.9235e-003
4.0e-002 8.4176e-003
5.0e-002 1.0120e-002
6.0e-002 1.2102e-002
7.0e-002 1.4219e-002
8.0e-002 1.6595e-002
9.0e-002 1.9202e-002
1.0e-001 2.2040e-002
1.1e-001 2.5270e-002
1.2e-001 2.8711e-002
1.3e-001 3.2558e-002
1.4e-001 3.6676e-002
1.5e-001 4.1031e-002
1.6e-001 4.5697e-002
/FUNCT/501
stress-strain curve dir 2
# true strain true stress
0.0e+000 0
1.0e-002 3.7475e-003
2.0e-002 6.4746e-003
3.0e-002 8.6433e-003
4.0e-002 1.0769e-002
5.0e-002 1.2923e-002
6.0e-002 1.5325e-002
7.0e-002 1.8090e-002
8.0e-002 2.1231e-002
9.0e-002 2.4870e-002
1.0e-001 2.8884e-002
1.1e-001 3.3246e-002
1.2e-001 3.8027e-002
1.3e-001 4.3127e-002
1.4e-001 4.8519e-002
1.5e-001 5.4217e-002
1.6e-001 6.0077e-002
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/FUNCT/502
stress-strain curve dir 12
# angle true stress
-16.170000000e-000 -1.5741500000e-003
-7.1750000000e-000 -4.3750000000e-004
0.0000000000e+000 0.0000000000e+000
7.1750000000e-000 4.3750000000e-004
16.170000000e-000 1.5741500000e-003
/FUNCT/600
unloading stress-strain curve dir 1, 2
# X Y
0.0e+000 0.0e+000
2.0e-002 5.0e-004
4.0e-002 1.0e-003
6.0e-002 2.0e-003
8.0e-002 5.0e-003
1.0e-001 1.0e-002
1.2e-001 3.0e-002
1.4e-001 7.0e-002
#ENDDATA
/END
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
Comments
- The failure criteria is only compatible with fabric material /MAT/LAW58 (FABR_A).
- Failure and damage is defined
independently in each direction (
=1,2), if:
(1) Where, is the fiber tensile strain.
The fiber stress will be reduced by:(2) - 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 in Engine.