MATF

Bulk Data Entry Defines material properties and failure model parameters for Failure criteria calculations.

Format

Field	Contents	SI Unit Example
`MID`	Material identification number. (Integer > 0)
`CRI`	`CRI` flag indicating that the failure criterion input data are to follow.
`CRITERIA`	Character String representing the chosen failure criterion. PUCK Puck failure criterion HILL Hill failure criterion HOFF Hoffman failure criterion TSAI Tsai-Wu failure criterion HASH Hashin failure criterion STRN Maximum strain failure criterion DUCTILE Damage initiation criterion No default
`TID`	Identification number of a TABLEMD entry that identifies the equivalent plastic strain (`Yi`) at the onset of damage vs temperature (`Xi`). 5
`Vi`	Material stress limits. `V1` Tensile stress limit in longitudinal direction `V2` Compressive stress limit in longitudinal direction `V3` Tensile stress limit in lateral direction `V4` Compressive stress limit in lateral direction `V5` In-plane shear stress limit (Real > 0.0)
`Wi`	Parameters for failure envelope. `W1` Failure envelope factor 12(-) `W2` Failure envelope factor 12(+) If blank, set to be equal to `W1`, `W1` and `W3` should be specified. `W3` Failure envelope factor 22(-) (Real > 0.0)

To use PUCK failure criteria, MATF entry should be specified with MID referring to the corresponding material entry. Also, FT field on PCOMP, PCOMPG, or PCOMPP should be set to PUCK.
MID field may refer to MAT1, MAT2, or MAT8 entries.
Different failure criteria for different materials can be defined by referencing the corresponding material entry (with same ID as MATF) on MID# fields of the PCOMP and PLY entries (for PCOMPP). If different materials with different failure criteria are required to be defined for a single composite property, then MATF entry should be used.
MATF entry is required only for PUCK failure criterion calculations.
If the CRITERIA field is set to DUCTILE, then the TID field should point to a TABLEMD entry with NDEP set to 1. The first data column (Yi) is the equivalent plastic strain at the onset of damage. The second data column (Xi) is the corresponding temperature. The second column should be specified in ascending order only.
When the CRITERIA field is set to DUCTILE in OSTTS analysis, the temperature-based lookup is conducted for each temperature to identify the corresponding equivalent plastic strain from the TABLEMD entry. This plastic strain is used in conjunction with the calculated von Mises Strain to calculate Damage (This can be output using the DAMAGE I/O Options Entry).