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/FAIL/TENSSTRAIN

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Block Format Keyword

/FAIL/TENSSTRAIN - Strain Failure Model

Description

Describes a strain failure model.

Format

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/FAIL/TENSSTRAIN/mat_ID/unit_ID

fct_ID

 

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)

 

Maximum principal tensile strain

Default = 1.E30  (Real)

 

Failure principal tensile strain

Default = 2.E30  (Real)

 

fct_ID

Function identifier of . It's function of scale factor for principal tensile strain () vs. strain rate.

(Integer)

 

Failure tension strain (first principal strain) (Comment 3)

(Real)

 

Failure tension strain (second principal strain) (Comment 3)

(Real)

 

fail_ID

(Optional) Failure criteria identifier (Comment 2)

(Integer, maximum 10 digits)

 
hmtoggle_plus1Example (Aluminum)

In this example set fail_tenstrain_et2. Using fct_ID, different principal strain (fail_tenstrain_et1  and fail_tenstrain_et2_eq) 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

Aluminum

#              RHO_I

         2.788714E-9

#                  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

#  fct_ID1   fct_ID2   fct_ID3   fct_ID4   fct_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/TENSSTRAIN/1

#                Et1                 Et2    fct_ID

                 .05                  .1        16

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

/FUNCT/16

scale factor for Eps_t1 and Eps_t2

#        strain rate        scale factor

#                  X                   Y

                   0                   1

                  50                  .5

               10000                  .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----|
hmtoggle_plus1Comments
1.The failure criteria is:

Where, symbol_e1 is principal tensile strain. Which could be observed by using ANIM/SHELL/TENS/STRAIN (or /ANIM/BRICK/TENS/STRAIN) in Engine.

The element is deleted, if D = 1 for one integration point. Damage value D could be observed by using /ANIM/SHELL/DAMA (or /ANIM/BRICK/DAMA) in Engine.

clip0008

Strain model failure.

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).
3.Element will be deleted, if the first or second (if defined) principal strain is reached. Damage value is not calculated for these failure limits (load path independent).

See Also:

Strain Failure in Theory Manual

Failure to Element/Material Compatibility