# /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)

$\left[\frac{\text{J}}{{\text{m}}^{\text{3}}}\right]$
E2 Failure specific energy. 2

Default = 230 (Real)

$\left[\frac{\text{J}}{{\text{m}}^{\text{3}}}\right]$
I_Dam Damage calculation flag. 4
=1
Only forces are reduced. The stress tensor is not damaged.
=2
Stress tensor is reduced (used before version 2018).

Default = 1 (Integer)

fct_ID Function identifier for $f\left(\stackrel{˙}{\epsilon }\right)$ . 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)

$\left[\frac{\text{1}}{\text{s}}\right]$
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----|

$D=\frac{E-{E}_{1}}{{E}_{2}-{E}_{1}}$