/FAIL/WILKINS

Block Format Keyword Describes the Wilkins failure model.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/FAIL/WILKINS/mat_ID/unit_ID
α β P lim D f Ifail_sh Ifail_so
Optional Line
(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)

 
α Hydrostatic pressure exponent.

(Real)

 
β Deviatoric coefficient.

(Real)

 
P lim Hydrostatic pressure limit.

(Real)

[ Pa ]
D f Critical damage.

(Real)

 
Ifail_sh Shell failure flag.
= 1
Shell is deleted, if D c D f for one integration point or layer.
= 2
For each integration point, the stress tensor is set to zero, if D c D f and shell is deleted, if D c D f for all integration points or layers.

(Integer)

 
Ifail_so Solid failure flag.
= 1
Solid is deleted, if D c D f for one integration point.
= 2
For each integration point, the deviatoric stress tensor vanishes, if D c D f .

(Integer)

 
fail_ID Failure criteria identifier. 2

(Integer, maximum 10 digits)

 

Example (Metal)

#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----|
#-  1. MATERIALS:
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/PLAS_JOHNS/1/1
Metal
#              RHO_I
              2.8E-9                   0
#                  E                  Nu
               60000                  .3
#                  a                   b                   n           EPS_p_max            SIG_max0
                 370                 190                  .4                   0                   0
#                  c           EPS_DOT_0       ICC   Fsmooth               F_cut               Chard
                   0                   0         0         0                   0                   0
#                  m              T_melt              rhoC_p                 T_r
                   0                   0                   0                   0
/FAIL/WILKINS/1/1
#              Alpha                Beta                Plim                  Df  Ifail_sh  Ifail_so
                 1.8                 .75                 750                 0.3         1         0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#enddata
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

Comments

  1. The cumulative damage is:

    D c = W 1 W 2 d ε ¯ p

    Where,

    W 1 = ( 1 1 + a P ) α

    a = 1 P lim

    Where,
    P
    Hydro pressure

    P = 1 3 j = 1 3 σ j j

    W 2 = ( 2 A ) β

    A = max ( s 2 s 1 , s 2 s 3 ) , s 1 s 2 s 3

    Where, s 1 , s 2 , s 3 are the deviatoric stresses.

  2. 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).