/FAIL/ENERGY
Block Format Keyword Describes a specific energy failure model.
Format
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| /FAIL/ENERGY/mat_ID/unit_ID | |||||||||
| E1 | E2 | fct_ID | Xscale | I_Dam | |||||
Optional Line
| (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) |
|
| E1 | Maximum specific energy. 2 Default = 130 (Real) |
|
| E2 | Failure specific energy. 2 Default = 230 (Real) |
|
| I_Dam | Damage calculation flag. 4
Default = 1 (Integer) |
|
| fct_ID | Function identifier for
. It is the function of specific energy E1 and E2 scaling factor vs. strain rate. (Integer) |
|
| Xscale | Scale factor for abscissa of the
function. Default = 1.0 (Real) |
|
| fail_ID | Failure criteria
identifier. 3 (Integer, maximum 10 digits) |
Example (Metal)
In this example, using fail_ID
different specific energy (E1 and
E2)
actually used by computation according to different test strain
rate.
#RADIOSS STARTER
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/UNIT/1
unit for mat
# MUNIT LUNIT TUNIT
Mg mm s
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/PLAS_TAB/1/1
Metal
# RHO_I
2.788714E-9 0
# E Nu Eps_p_max Eps_t Eps_m
68000 .3 0 0 0
# N_funct F_smooth C_hard F_cut Eps_f
1 0 0 0 0
# fct_IDp Fscale Fct_IDE EInf CE
0 1 0 0 0
# func_ID1 func_ID2 func_ID3 func_ID4 func_ID5
2
# Fscale_1 Fscale_2 Fscale_3 Fscale_4 Fscale_5
0
# Eps_dot_1 Eps_dot_2 Eps_dot_3 Eps_dot_4 Eps_dot_5
0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/FAIL/ENERGY/1/1
# E1 E2 funct_ID Xscale I_Dam
0.3 0.34 18 1
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/FUNCT/18
scale factor for specific energy E1 and E2
# strain rate scale factor
# X Y
0 1
50 0.5
10000 0.5
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/FUNCT/2
True Stress-True plastic strain
# X Y
0 124
.01 150
.02 165
.04 184
.06 196
.08 203
.1 206
.12 210
.14 213
.16 217
.18 220
.5 240
1000 240
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#enddata
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|Comments
- The element is
deleted, if D=1 for one integration point.
(1) - The specific
energy is the current internal energy of the element divided by the current element volume.
Internal energy (IE) could be observed in time history plot.
Figure 1. Specific Energy Model Failure - 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).
- The I_Dam option improves damage calculation and stability calculating damage, it is not available for shell elements and material laws N° < 29 . It is available for the /MAT/LAW25 (CRASURV) law, if using /PROP/TYPE51 or /PLY and /STACK options.