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*MAT_ADD_EROSION

LS-DYNA Input Interface KeywordDefines a cumulative failure model.

Format

(1) (2) (3) (4) (5) (6) (7) (8)
*MAT_ADD_EROSION
mat_ID   Pmax Eps_min Eps_eff Eps_vol P_thick_fail NCS
Pmin SigP1_max Sig_max Eps_max Shear Sigr K Time_max
If IDAM = 0
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IDAM             fct_IDel
If IDAM > 0
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IDAM   EPSF_ID INST_ID N D_crit EXP fct_IDel
EL_REF   FCT_SR SHRF BIAXF    
If IDAM < 0
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IDAM fct_IDel
INITYP TAB_ID PARAM2 PARAM3        
EVOTYP COMPTYP DISP          
Optional cards.
(1) (2) (3) (4) (5) (6) (7) (8)
Tab_ID_FLD Nstep Thinning     fct_IDg12 fct_IDg13 fct_IDe1c
  Volfrac Tmax Dtmin        

Definition

Field Contents SI Unit Example
mat_ID Material identifier.

(Integer)

Pmax Maximum pressure.

(Real)

[Pa]
Eps_min Minimum principal strain.

(Real)

 
Eps_eff Maximum effective strain.

(Real)

 
Eps_vol Maximum volumetric strain.

(Real)

 
P_thick_fail Number of integration points to element failure.

(Real)

NCS Number of failure criteria to element failure.

(Real)

Pmin Minimum pressure.

(Real)

[Pa]
SigP1_max Maximum principal stress.

(Real)

[Pa]
Sig_max Maximum equivalent stress.

(Real)

[Pa]
Eps_max Maximum principal strain.

(Real)

Shear Maximum Tensorial shear strain.

(Real)

Sigr Initial fracture stress for Tuler-Butcher criterion.

(Real)

[Pa]
K Critical value of the damage integral for Tuler-Butcher criterion.

(Real)

[Pa2s]
Time_max Failure time.

(Real)

[s]
IDAM Additional failure model flag.
= 0
Multiple criteria failure model.
< 0
Multiple criteria and tabulated failure model.
> 0
Multiple criteria with initiation and evolution failure model.

(Integer)

EPSF_ID Plastic strain at failure table identifier (used only if IDAM > 0).

(Real)

INST_ID Instability (necking) plastic strain table identifier (used only if IDAM > 0).

(Real)

N Damage accumulation exponent (used only if IDAM > 0).

(Real)

D_crit Critical damage for stress softening triggering (used only if IDAM > 0).

(Real)

EXP Scale factor for stress softening exponent function (used only if IDAM > 0).

(Real)

fct_IDel Element size scale factor function identifier.

(Integer)

EL_REF Reference element size for size scaling table.

(Real)

[m]
FCT_SR Strain rate dependency function identifier.

(Real)

SHRF Lower stress triaxiality boundary for element size scaling.

(Real)

BIAXF Upper stress triaxiality boundary for element size scaling.

(Real)

INITYP Damage initiation criterion type.

(Real)

TAB_ID Failure initiation criterion table identifier.

(Real)

PARAM2 Damage initiation parameter.

(Real)

PARAM3 Damage initiation parameter.

(Real)

EVOTYP Damage evolution type.
= 0
Damage is function of plastic displacement.
= 1
Damage is function of fracture energy.

(Real)

COMPTYP Criterion combination type.

(Real)

DISP Damage evolution parameter.
If EVOTYP = 0
Plastic displacement at failure.
If EVOTYP = 1
Fracture energy at failure.

(Real)

[m]

[Jm2]

Tab_ID_FLD Table or function identifier of the Forming Limit Diagram.

(Integer)

Nstep Number of cycles for the stress reduction for stress reduction.

(Real)

Thinning Thinning failure value.

(Real)

fct_IDg12 Function identifier of the maximum in-plane shear strain γ12 versus element size.

(Integer)

fct_IDg13 Function identifier of the maximum transversal shear strain γ13 versus element size.

(Integer)

fct_IDe1c Function identifier of the maximum in-plane major strain εc1 versus element size.

(Integer)

Volfrac Volume fraction of the solid element to reach before the element is deleted.

(Real)

Tmax Maximum temperature.

(Real)

[K]
Dtmin Minimum time step.

(Real)

[s]

Comments

  1. This keyword maps to /FAIL/GENE1, /FAIL/INIEVO, and/or /FAIL/TAB2.
  2. The option “_TITLE” can be added to the end of this keyword. When “_TITLE” is included, an extra 80 characters long line is added after the keyword input line which allows an entity title to be defined.