/FAIL/ENERGY
Block Format Keyword Describes an energy density failure model.
Format
(1)  (2)  (3)  (4)  (5)  (6)  (7)  (8)  (9)  (10) 

/FAIL/ENERGY/mat_ID/unit_ID  
E_{1}  E_{2}  fct_ID  Xscale  I_Dam 
(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) 

E_{1}  Maximum energy density. 2 Default = 1^{30} (Real) 
$\left[\frac{\text{J}}{{\text{m}}^{\text{3}}}\right]$ 
E_{2}  Failure energy density. 2 Default = 2^{30} (Real) 
$\left[\frac{\text{J}}{{\text{m}}^{\text{3}}}\right]$ 
I_Dam  Damage calculation flag. 4
Default = 1 (Integer) 

fct_ID  Function identifier for
$f\left(\dot{\epsilon}\right)$
. It is the function of energy density E_{1} and E_{2} scaling factor versus 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)
#RADIOSS STARTER
#12345678910
/UNIT/1
unit for mat
# MUNIT LUNIT TUNIT
Mg mm s
#12345678910
/MAT/PLAS_TAB/1/1
Metal
# RHO_I
2.788714E9 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
#12345678910
/FAIL/ENERGY/1/1
# E1 E2 funct_ID Xscale I_Dam
0.3 0.34 18 1
#12345678910
/FUNCT/18
scale factor for energy density E1 and E2
# strain rate scale factor
# X Y
0 1
50 0.5
10000 0.5
#12345678910
/FUNCT/2
True StressTrue 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
#12345678910
#enddata
#12345678910
Comments
 The element is
deleted, if D=1 for one integration point.
(1) $$D=\frac{E{E}_{1}}{{E}_{2}{E}_{1}}$$  The energy density is the current internal energy of the element divided by the current element volume. The value will be different than the element time history /TH/element Internal energy (IE) which is the current internal energy divided by the "initial" element volume.
 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.