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/FAIL/XFEM_JOHNS (Obsolete)

/FAIL/XFEM_JOHNS (Obsolete)

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/FAIL/XFEM_JOHNS (Obsolete)

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/FAIL/XFEM_JOHNS - Failure Model for XFEM Crack Initialization and Propagation (Johnson-Cook based)

Description

Describes a XFEM (eXtended Finite Element Method) failure model.

Format

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

/FAIL/XFEM_JOHNS/mat_ID/unit_ID

D1

D2

D3

D4

D5

symbol_e_dot_0

Ifail_sh

 

 

 

 

 

 

 

Optional line:

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

fail_ID

 

 

 

 

 
hmtoggle_plus1Flag Definition

Field

Contents

SI Unit Example

mat_ID

Material identifier

(Integer, maximum 10 digits)

 

unit_ID

Optional unit identifier

(Integer, maximum 10 digits)

 

D1

1st parameter

(Real)

 

D2

2nd parameter

(Real)

 

D3

3rd parameter

(Real)

 

D4

4th parameter

(Real)

 

D5

5th parameter

(Real)

 

symbol_e_dot_0

Reference strain rate

(Real)

fail_johnson

Ifail_sh

Shell failure flag

(Integer)

= 1: Shell is cracked (not deleted), if clip0236 for one integration point or layer.

= 2: For each integration point, the stress tensor is set to zero, if clip0236; and shell is cracked (not deleted), for all integration points or layers.

 

fail_ID

(Optional) Failure criteria identifier (see Comment 4)

(Integer, maximum 10 digits)

 
hmtoggle_plus1Example (Steel)

#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

Steel

#              RHO_I

              7.8E-9

#                  E                  Nu

              210000                  .3

#                  a                   b                   n           EPS_p_max            SIG_max0

                 270                 450                  .6                   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/JOHNSON/1/1

#                 D1                  D2                  D3                  D4                  D5

                0.11                0.08                -1.5                   0                   0

#              EPS_0  Ifail_sh  Ifail_so                                    Dadv               Ixfem

                   1         1         1                                     0.5                   1

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

#enddata

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
hmtoggle_plus1Comments
1.This failure model is available for Shell only.
2.The parameters are used in the stress-strain relationship:

where,

T* is computed in the material law, if this one is thermo plastic, like /MAT/HYD_JCOOK (LAW4).

3.Current known limitations are:
•/PARITH/ON does not ensure results repeatability, if SPMD > 1; it works in SMP parallel mode only.
•XFEM is currently NOT compatible with either /ANIM/VECT or with /PARITH/OFF.
4.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).