*MAT_ADD_DAMAGE_GISSMO

LS-DYNA Input Interface KeywordAdditional failure model defining the plastic strain at failure, function of stress triaxiality, strain rate, Lode angle, element size, and temperature.

Format

(1) (2) (3) (4) (5) (6) (7) (8)
*MAT_ADD_DAMAGE_GISSMO
mat_ID DTYP EL_REF PTHICKFAIL VOLFRAC
EPSF_ID ECRIT N DCRIT FADEXP TAB_EL
FCT_SR SHRF BIAXF FCT_DLIM

Definition

Field Contents SI Unit Example
mat_ID Material identifier.

(Integer)
DTYP Damage Accumulation flag.
= 1
Damage is accumulated, and element failure occurs for D = 1.

(Integer)
EL_REF Reference element size for size scaling table.

Default = 1.0 (Real)

 [ m ]
PTHICKFAIL Number of integration points to element failure.

(Real)
VOLFRAC Volume fraction of failed integration points prior to solid element deletion (Only used for fully-integrated and higher order solid elements).

Default = 0.0 (Real)
EPSF_ID Plastic strain at failure table or function identifier.
  • If function ID: plastic strain at failure versus triaxiality.
  • If 2-dimensions table ID: plastic strain at failure versus triaxiality versus Lode parameter.
  • If 3-dimensions table ID: plastic strain at failure versus triaxiality versus Lode parameter versus temperature.

(Integer)
ECRIT Scale factor for necking plastic strain table identifier.

(Real)
N Damage accumulation exponent.

Default = 1.0 (Real)
DCRIT Critical damage for stress softening triggering.

Default = 0.0 (Real)
FADEXP Exponent for damage-related stress fadeout:
< 0.0
Stress softening exponent function identifier.
> 0.0
Stress softening exponent constant value.

Default = 0.0 (Real)
TAB_EL Element size scaling table or function identifier.

(Integer)
FCT_SR Strain rate dependency function identifier.

If the first strain rate value is negative in FCT_SR, logarithmic scale is assumed.

(Integer)
SHRF Lower stress triaxiality boundary for element size scaling.

Default = -1.0 (Real)
BIAXF Upper stress triaxiality boundary for element size scaling.

Default = 1.0 (Real)

 [ 1 s ]
FCT_DLIM Damage limit function scale factor.

Default = 1.0 (Real)

Comments

  1. This keyword maps to /FAIL/TAB2.