*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

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
`IDAM`							`fct_ID`_el

If IDAM > 0

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
`IDAM`		`EPSF_ID`	`INST_ID`	`N`	`D_crit`	`EXP`	`fct_ID`_el
	`EL_REF`		`FCT_SR`	`SHRF`	`BIAXF`

If IDAM < 0

(1)	(2)	(3)	(4)	(8)
`IDAM`				`fct_ID`_el
`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)	$[Pa]$ $[Pa]$
`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)	$[Pa]$ $[Pa]$
`SigP1_max`	Maximum principal stress. (Real)	$[Pa]$ $[Pa]$
`Sig_max`	Maximum equivalent stress. (Real)	$[Pa]$ $[Pa]$
`Eps_max`	Maximum principal strain. (Real)
`Shear`	Maximum Tensorial shear strain. (Real)
`Sigr`	Initial fracture stress for Tuler-Butcher criterion. (Real)	$[Pa]$ $[Pa]$
`K`	Critical value of the damage integral for Tuler-Butcher criterion. (Real)	$[P a^{2} s]$ $[P a^{2} s]$
`Time_max`	Failure time. (Real)	$[s]$ $[s]$
`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_ID`_el	Element size scale factor function identifier. (Integer)
`EL_REF`	Reference element size for size scaling table. (Real)	$[m]$ $[m]$
`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)	$[m]$ $[m]$ $[\frac{J}{m^{2}}]$ $[\frac{J}{m^{2}}]$
`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 $γ_{12}$ $γ_{12}$ versus element size. (Integer)
`fct_IDg13`	Function identifier of the maximum transversal shear strain $γ_{13}$ $γ_{13}$ versus element size. (Integer)
`fct_IDe1c`	Function identifier of the maximum in-plane major strain $ε_{1}^{c}$ $ε_{1}^{c}$ versus element size. (Integer)
`Volfrac`	Volume fraction of the solid element to reach before the element is deleted. (Real)
`Tmax`	Maximum temperature. (Real)	$[K]$ $[K]$
`Dtmin`	Minimum time step. (Real)	$[s]$ $[s]$

Comments

This keyword maps to /FAIL/GENE1, /FAIL/INIEVO, and/or /FAIL/TAB2.
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.