MATFATT
Bulk Data Entry Defined temperature-dependent material properties for fatigue analysis.
Format
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| MATFATT | MID | TEMPUNIT |
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| TEMP | Ti | ||||||||
| SNTBL | REFTYPE | LogSE | Nc1 | Nc | FINDLEY | STSTYPE | |||
| REFVAL | A1 | B1 | A2 | B2 | A3 | B3 | |||
| A4 | B4 | A5 | B5 | etc. |
Definitions
| Field | Contents | SI Unit Example |
|---|---|---|
| MID | Material
identification number that matches the identification number on
a MAT1 Bulk Data Entry and the corresponding
MATFAT entry. No default (Integer > 0) |
|
| TEMPUNIT | Temperature
unit. Default = C (C, F) |
|
| TEMP | Flag indicating that the temperature value follows. | |
| Ti | Temperature at which
the corresponding Haigh diagram is defined. A single Haigh
diagram can be defined at each temperature
(Ti). No Default (Real) |
|
| SNTBL | Flag indicating that X-Y data for a Haigh Diagram follows. | |
| REFTYPE | Reference type
identifying the type of curve definition.
Ai, Bi data below represents a single Haigh diagram. The life value for the Haigh diagram curve is identified via the REFVAL field. No default (LIFE) |
|
| LogSE | Standard Error of
log(Stress). Default = 0.0 (Real > 0.0) |
|
| Nc1 | Fatigue transition
point. After this point, fatigue strength is offset by the
surface correction factor. Before this point, fatigue strength
is proportionally reduced. Default = NC (Real > Nc_stat) |
|
| Nc | Endurance limit. Number
of cycles at which damage can be considered zero. Default = 1.0E+8 (Real > 1.0E+5) |
|
| FINDLEY | Constant k in the
Findley model. Default = 0.3 (Real > 0.0) |
|
| STSTYPE | Stress type.
|
|
| REFVAL1 | Reference value of Life
for which the Haigh Diagram is defined. No default (Real) |
|
| Ai | Depending on STSTYPE, Ai values can be one of stress amplitude, stress range, or max stress. | |
| Bi | Depending on
REFTYPE, Bi values can
be life (REFTYPE=MEAN or
RRATIO) or mean stress
(REFTYPE=LIFE). No default |
Comments
- The MID field of the MATFATT entry should match with a corresponding MATFAT entry (which is used to define basic information such as stress units and length) and a MAT1 entry.
- Only a single Haigh diagram per temperature is currently supported. Therefore, only safety factor analysis is currently supported with MATFATT.
- Static failure is currently not supported with the MATFATT Bulk Data Entry.