Failures

Failures describe material failure criteria to be coupled to material models.

In PAM-CRASH 2G, Damage and Failure parameters of Modular material MMAT are defined through the Failure entity.

In Radioss, Failure models are defined with the keywords /FAIL.

Failure entities have a display state, on or off, which controls the display of these entities in the graphics area. To hide or show a Failure entity, the “Hide Attached” option in the Model Browser configure window, must be activated. The display state of a Failure entity can be controlled using the icon next to the entity in the Model Browser.

Failure entities also have an active and export state. The active state of a Failure entity controls its display state and its listing in the Model Browser along with its views. If a Failure entity is active, then its display state is available to be turned on or off and it is listed in the Model Browser along with its views. If a Failure entity is inactive, then its display state is turned off permanently and it is not listed in the Model Browser or any of its views.

The export state of a Failure entity controls whether or not this entity is exported when the custom export option is used. The all export option is not affected by the export state. The active and export states of Failure entities can be controlled using the Entity State Browser.

PAM-CRASH Cards

Card Solver Description Application Notes
MMAT /

FAILURE

GLOBAL_BEHAVIOR
Global Damage and Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

DUCTILE_CURVES
Ductile Damage by Curves Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

DUCTILE_LOOKU
Ductile Damage by Look-Up Tables Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

SHEAR_CURVES
Shear Damage by Curves Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

SHEAR_LOOKU
Shear Damage by Look-Up Tables Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

JOHNSON_COOK
Johnson-Cook Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

XUE_WIERZBICKI
Xue-Wierzbicki Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

MODIFIED_MOHR_COULOMB
Modified Mohr-Coulomb Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

ANISOTROPIC_FRACTURE
Anisotropic Fracture Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

FORMING_LIMIT_DIAGRAM
Forming Limit Diagram Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

MUSCHENBORN_SONNE
Müschenborn-Sonne Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

ENHANCED_HILL_STOREN_RICE
Enhanced Hill-Stören-Rice Failure Parameters Definition Damage and Failure Parameters Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

GENERALIZED_NECKING
Generalized Necking Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

PLASTIC_STRAIN_SOFTENING
Plastic Strain Softening Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

HILL_STOREN_RICE
Hill-Stören-Rice Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

MODIFIED_HILL_STOREN_RICE
Modified Hill-Stören-Rice Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

RELATIVE_THICKNESS
Relative Thickness Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

MAXIMUM_STRAINING
Maximum Straining Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

PLASTIC_STRAIN_DAMAGE
Plastic Strain Damage Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

EXTENDED_COCKCROFT_LATHAM
Extended Cockcroft-Latham Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /
MMAT /

FAILURE

TABLE_DRIVEN_LOOKUP
Data-Driven Look-Up Table Failure Parameters Definition Elastic-plastic materials Damage and Failure Parameters defined in a FAILURE - END_FAILURE cards block of MMAT /

Radioss Cards

Card Solver Description Application Notes
/FAIL/BIQUAD Strain failure model Ductile metal Direct input on effective plastic strain to failure
/FAIL/CHANG Chang-Chang model Composite Failure criteria for composites
/FAIL/CONNECT Failure Connection spot weld Normal and Tangential failure model
/FAIL/EMC Extended Mohr Coulomb failure model Metal Failure dependent on effective plastic strain
/FAIL/ENERGY Energy isotrop Metal, plastic Specific energy
/FAIL/FABRIC Anisotropic strain failure Fibers of fabric material Fabric material laws MAT58 and MAT98
/FAIL/FLD Forming limit diagram Metal Forming Fld
/FAIL/HASHIN Composite model Composite Hashin model
/FAIL/HC-DSSE Strain-based failure model Shells with linear damage accumulation Hosford-Coulomb with Domain of Shell-to-Solid Equivalence
/FAIL/JOHNSON Ductile failure model Ductile metal Johnson-Cook
/FAIL/LAD_DAMA Composite delamination Composite Ladeveze delamination model
/FAIL/NXT NT failure model Metal Forming Similar to FLD, but based on stresses
/FAIL/ORTHSTRAIN Orthotropic strain failure model Solid and Shell elements Size effects and strain rate effects
/FAIL/PUCK Composite model Composite Puck model
/FAIL/SNCONNECT Failure Connection, spot weld Failure criteria for plastic strain
/FAIL/SPALLING Ductile + Spalling Ductile metal Spalling + Johnson-Cook
/FAIL/TAB1 Strain failure model Ductile metal Based on damage accumulation using user-defined functions
/FAIL/TBUTCHER Tuler-Butcher model Ductile metal Failure due to fatigue
/FAIL/TENSSTRAIN Traction Metal, plastic Strain failure
/FAIL/USERi User failure model n/a n/a
/FAIL/WIERZBICKI Ductile material Ductile metal Bao-Xue-Wierzbicki model
/FAIL/WILKINS Ductile failure model Ductile metal Wilkins model
/FAIL/XFEM XFEM (Extended Finite Element Method