FATDEF
Bulk Data Entry Defines elements or grids, and associated fatigue properties, for consideration in a fatigue analysis.
Format
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| FATDEF | ID | TOPSTR | TYPE |
Optional continuation lines for selecting elements, or corresponding
grids, and associated fatigue properties, using element sets
(ELSET)
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| ELSET | ELSID1 | PFATID1/
PFATSPWID1 |
ELSID2 | PFATID2/ PFATSPWID2 |
ELSID3 | PFATID3/ PFATSPWID3 |
|||
| ELSID4 | PFATID4/ PFATSPWID4 |
etc | etc | etc | etc | ||||
| etc | etc |
Optional continuation lines for selecting elements and associated fatigue
properties through referenced properties
(PTYPE)
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| PTYPE | PID1 | PFATID1/ PFATSPWID1 |
PID2 | PFATID2/ PFATSPWID2 |
PID3 | PFATID3/ PFATSPWID3 |
|||
| PID4 | PFATID4/ PFATSPWID4 |
etc | etc | etc | etc | ||||
| etc | etc |
Optional continuation lines for seam weld fatigue analysis
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| FATSEAM | FATSEAM ID1 | PFATSMW ID1 | FATSEAM ID2 | PFATSMW ID2 | PFATSMW ID3 | ||||
| FATSEAM ID4 | PFATSMW ID4 | etc | etc | etc | etc | ||||
| etc | etc | FATSEAM ID3 |
Optional continuation lines for excluding elements using element sets
(ELSET)
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| XELSET | XELSID1 | XELSID2 | XELSID3 | XELSID4 | XELSID5 | XELSID6 | XELSID7 | ||
| XELSID8 | etc | etc | etc | etc | etc | etc | |||
| etc | etc |
Optional continuation lines for excluding individual elements
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| XELEM | XEID1 | XEID2 | XEID3 | XEID4 | XEID5 | XEID6 | XEID7 | ||
| XEID8 | etc | etc | etc | etc | etc | etc | |||
| etc | etc |
Optional continuation lines for excluding grids using grid sets
(GSET)
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| XGSET | XGSID1 | XGSID2 | XGSID3 | XGSID4 | XGSID5 | XGSID6 | XGSID7 | ||
| XGSID8 | etc | etc | etc | etc | etc | etc | |||
| etc | etc |
Optional continuation lines for excluding individual grids
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| XGRID | XGID1 | XGID2 | XGID3 | XGID4 | XGID5 | XGID6 | XGID7 | ||
| XGID8 | etc | etc | etc | etc | etc | etc | |||
| etc | etc |
Definitions
| Field | Contents | SI Unit Example |
|---|---|---|
| ID | Each
FATDEF card must have a unique
ID. FATDEF
Subcase Information Entry may reference this
ID. No default (Integer > 0) |
|
| TOPSTR | Top
stress fraction. Elements with combined stress not
in this top fraction of each MATFAT group
will be screened out and have no results. This
field is ignored in fatigue analysis on a
transient subcase. Default = blank (100% will be used internally), (0.0 < Real ≤ 1.0) |
|
| TYPE | Option to switch between Grids and Elements for
Fatigue Analysis.
|
|
| ELSET | Indicates that a list of pairs of ELSET and PFAT/PFATSPW IDs will follow, defining elements, and their associated fatigue properties, for consideration in fatigue analyses where this FATDEF is selected. | |
| ELSID# | Element set ID. Elements in this set will be
considered in fatigue analyses where this
FATDEF is selected. No default (Integer > 0) |
|
| PFATID# | Fatigue property ID. This is the identification number of a PFAT entry, which indicates the fatigue property used by the preceding elements defined by ELSID# or PID#. | |
| PFATSPWID# | Fatigue property ID for spot weld fatigue analysis. This is the identification number of a PFATSPW entry, which indicates the fatigue property used by the preceding elements defined by ELSID# or PID#. | |
| PTYPE | Indicates that a list of pairs of property IDs of type PTYPE and PFAT/PFATSPW IDs will follow; defining elements and their associated fatigue properties for consideration in fatigue analyses where this FATDEF is selected. 2 | |
| PID# | Property ID. This is the identification number of
a property entry corresponding to the specified
PTYPE field. Elements
referencing any property with this ID will be
considered in fatigue analyses where this
FATDEF is selected. 3 No default (Integer > 0) |
|
| FATSEAM | Indicates that the list of pairs of FATSEAM ID's and PFATSMW ID's are to follow and these will be used for seam weld fatigue analysis. | |
| FATSEAM ID# | References a FATSEAM Bulk Data Entry that contains parameters and property identification information for seam weld fatigue analysis. | |
| PFATSMW ID# | Fatigue property ID for seam weld fatigue analysis. This is the identification number of a PFATSMW entry, which indicates the fatigue property used by the preceding elements defined by ELSID# or PID#. | |
| XELSET | Indicates that IDs of elements sets excluded from fatigue analysis follow. | |
| XELSID# | Element set ID. Elements in these sets will be
excluded from fatigue analyses where this
FATDEF is selected. No default (Integer > 0) |
|
| XELEM | Indicates that IDs of elements excluded from fatigue analysis follow. | |
| XEID# | Element ID. These elements will be excluded from
fatigue analyses where this
FATDEF is selected. No default (Integer > 0) |
|
| XGSET | Indicates that IDs of grid sets excluded from fatigue analysis follow. 4 5 6 | |
| XGSID# | Grid
set ID. Grids in these sets will be excluded from
fatigue analyses where this
FATDEF is selected. 4
5
6 No default (Integer > 0) |
|
| XGRID | Indicates that IDs of Grids excluded from fatigue analysis follow. 4 5 6 | |
| XGID# | Grid
ID. These Grids will be excluded from fatigue
analyses where this FATDEF is
selected. 4
5
6 No default (Integer > 0) |
Comments
- At least one of the optional continuation lines ELSET or PROP must be present.
- PTYPE can
be set as one of PSHELL,
PSOLID, PWELD,
PBAR, PBARL,
PBEAM, or PBEAML to
represent that the corresponding property ID's
(PID# fields) are to follow.Note: That PWELD, PBAR, PBARL, PBEAM, or PBEAML references for PTYPE field are supported only for spot weld fatigue analysis. Additionally, for spot weld fatigue analysis, PFATSPWID# fields should reference corresponding PFATSPW entries.
- The PID# field should reference the property entry of the same type as the corresponding PTYPE.
- The TYPE=GRID option is only supported for Dang Van Factor of Safety Fatigue Analysis and Optimization. It is also only supported for Solid elements. Optimization is available and RTYPE on DRESP1 should be set to GPFAT. PTYPE should be PSOLID or ELEM, and ATTA should be FOS.
- When TYPE=GRID, XELSET and XELEM (if available) are considered first to exclude any elements from the elements defined via ELSET/PROP continuation lines. Grids are then populated from the remaining elements. Then XGSET and XGRID (if available) are applied to exclude any grids.
- When TYPE=GRID, and if multiple properties are associated with a single grid, then GPSTRESS of the grid used in Fatigue Analysis is averaged GPSTRESS at the grid. If multiple materials are associated with a node, a material that has the lowest UTS (lowest YS if UTS is not defined) is used for the calculation.
- This card is represented as a load collector in HyperMesh.