/FAIL/EMC

Block Format Keyword Describes failure dependent on effective plastic strain.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/FAIL/EMC/mat_ID/unit_ID
a n b0 c    
Card 2
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
γ ε˙0            
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)

 
a Hosford exponent.

Default = 1.0 (Real)

 
n Stress state sensitivity exponent.

(Real)

 
b0 Strain to fracture for uni-axial tension. 2

Default = 1.0 (Real)

 
c Friction parameter for triaxiality.

Default = 0.0 (Real)

 
γ Strain rate sensitivity parameter.

(Real)

 
ε˙0 Reference strain rate.

Default = 1030 (Real)

[1s]
fail_ID (Optional) Failure criteria identifier. 3

(Integer, maximum 10 digits)

 

Example (Metal)

Fracture parameters could be identified with tests like uniaxial tension ( η=1/3,θ=1), pure shear ( η=0,θ=0), and axisymmetric compression ( η=2/3,θ=1).

#RADIOSS STARTER
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/UNIT/1
unit for mat
                 Mg                  mm                   s
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#-  2. MATERIALS:
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/LAW84/1/1
Swift-voce (metal)
#              RHO_I
                8E-9
#                  E                  NU
             206000.                0.30
#                P12                 P22                 P33               QVOCE               BVOCE
                -0.5                  1.                  3.            524.0000                 25.
#                G11                 G22                 G33                  K0               ALPHA
                -0.5                  1.                  3.                100.                 0.5
#                 AN                EPS0                  NN               CEPSP               DEPS0
               1000.             0.00128               0.200               0.014              0.0011
#                ETA                  CP                TINI                TREF               TMELT
                 0.9              420e+8                 293                293.               1700.
#              MTEMP              DEPSAD
               0.921               1.379
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/FAIL/EMC/1/1
#         exponent_a          exponent_n              coef_b              coef_c
                 1.9                 0.2                0.20                 0.0
#               GAMA               DEPS0
                 0.0                 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 failure criteria is calculated as:(1)
    Dfail=ΔD>1 MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiramaaBaaaleaacaWGMbGaamyyaiaadMgacaWGSbaabeaakiabg2da9maaqaeabaGaeuiLdqKaamiraaWcbeqab0GaeyyeIuoakiabg6da+iaaigdaaaa@41BB@
    Where,(2)
    ΔD=Δε¯pε¯p,fail MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaaeiLdiaadseacqGH9aqpdaWcaaqaaiaabs5acuaH1oqzgaqeamaaBaaaleaacaWGWbaabeaaaOqaaiqbew7aLzaaraWaaSbaaSqaaiaadchacaGGSaGaamOzaiaadggacaWGPbGaamiBaaqabaaaaaaa@4433@
    Where,(3)
    ε¯p,fail=b(1+c)1n{[12((f1f2)a+(f2f3)a+(f1f3)a)]1a+c(2η+f1+f3)}1n MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGafqyTduMbaebadaWgaaWcbaGaamiCaiaacYcacaWGMbGaamyyaiaadMgacaWGSbaabeaakiabg2da9iaadkgacqGHflY1daqadaqaaiaaigdacqGHRaWkcaWGJbaacaGLOaGaayzkaaWaaWbaaSqabeaadaWcaaqaaiaaigdaaeaacaWGUbaaaaaakiabgwSixpaacmaabaWaamWaaeaadaWcaaqaaiaaigdaaeaacaaIYaaaamaabmaabaWaaeWaaeaacaWGMbWaaSbaaSqaaiaaigdaaeqaaOGaeyOeI0IaamOzamaaBaaaleaacaaIYaaabeaaaOGaayjkaiaawMcaamaaCaaaleqabaGaamyyaaaakiabgUcaRmaabmaabaGaamOzamaaBaaaleaacaaIYaaabeaakiabgkHiTiaadAgadaWgaaWcbaGaaG4maaqabaaakiaawIcacaGLPaaadaahaaWcbeqaaiaadggaaaGccqGHRaWkdaqadaqaaiaadAgadaWgaaWcbaGaaGymaaqabaGccqGHsislcaWGMbWaaSbaaSqaaiaaiodaaeqaaaGccaGLOaGaayzkaaWaaWbaaSqabeaacaWGHbaaaaGccaGLOaGaayzkaaaacaGLBbGaayzxaaWaaWbaaSqabeaadaWcaaqaaiaaigdaaeaacaWGHbaaaaaakiabgUcaRiaadogadaqadaqaaiaaikdacqaH3oaAcqGHRaWkcaWGMbWaaSbaaSqaaiaaigdaaeqaaOGaey4kaSIaamOzamaaBaaaleaacaaIYaaabeaaaOGaayjkaiaawMcaaaGaay5Eaiaaw2haamaaCaaaleqabaGaeyOeI0YaaSaaaeaacaaIXaaabaGaamOBaaaaaaaaaa@789A@
    Where, f1 MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOzamaaBaaaleaacaaIZaaabeaaaaa@37CA@ , f2 MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOzamaaBaaaleaacaaIZaaabeaaaaa@37CA@ and f3 MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOzamaaBaaaleaacaaIZaaabeaaaaa@37CA@ are functions of the Lode angle θ :(4)
    f1=23cos[π6(1θ)]
    (5)
    f2=23cos[π6(3+θ)]
    (6)
    f3=23cos[π6(1+θ)]
    With(7)
    θ=12πarccos[332J3(J2)3/2]

    Where, η is the traixiality η=σmσVM=I133J2 MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeq4TdGMaeyypa0ZaaSaaaeaacqaHdpWCdaWgaaWcbaGaamyBaaqabaaakeaacqaHdpWCdaWgaaWcbaGaamOvaiaad2eaaeqaaaaakiabg2da9maalaaabaGaamysamaaBaaaleaacaaIXaaabeaaaOqaaiaaiodadaGcaaqaaiaaiodacaWGkbWaaSbaaSqaaiaaikdaaeqaaaqabaaaaaaa@455F@ .

  2. The coefficient, b is computed as:

    b=b0[1+γln(ε¯˙pε¯˙0)] MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOyaiabg2da9iaadkgadaWgaaWcbaGaaGimaaqabaGcdaWadaqaaiaaigdacqGHRaWkcqaHZoWzciGGSbGaaiOBamaabmaabaWaaSaaaeaacuaH1oqzgaqegaGaamaaBaaaleaacaWGWbaabeaaaOqaaiqbew7aLzaaryaacaWaaSbaaSqaaiaaicdaaeqaaaaaaOGaayjkaiaawMcaaaGaay5waiaaw2faaaaa@4816@ if ε¯˙p>ε¯˙0 MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGafqyTduMbaeHbaiaadaWgaaWcbaGaamiCaaqabaGccqGH+aGpcuaH1oqzgaqegaGaamaaBaaaleaacaaIWaaabeaaaaa@3C9D@ else b=b0 MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOyaiabg2da9iaadkgadaWgaaWcbaGaaGimaaqabaaaaa@39B0@

  3. The fail_ID is used with /STATE/BRICK/FAIL and /INIBRI/FAIL for brick. 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 for brick).