# PFAT

Bulk Data Entry Defines element properties for fatigue analysis.

## Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PFAT ID Layer Finish Treatment Kf

## Definitions

Field Contents SI Unit Example
ID Each PFAT card must have a unique ID. This ID may be referenced from a FATDEF definition.

No default (Integer > 0)

Layer Region Layer for shell elements. 1
0 (Default)
Worst
1
Top
2
Bottom

Finish Material Surface Finish, a result of manufacturing process. 3
NONE (Default)
POLISH
GROUND
MACHINE
HOTROLL
FORGE

Or any float value between 0.0 and 1.0.

When it is a float value, it will be used to modify the fatigue limit by multiplied with the original fatigue limit.

Treatment Material Surface Treatment for Material S-N Curve, a process used to enhance the fatigue life. 3
NONE (Default)
NITRIDED
SHOTPEEN
COLDROLL

Or any float value greater than 0.0.

When it is a float value, it will be used to modify the fatigue limit by multiplied with the original fatigue limit.

Kf Fatigue strength reduction factor. 2 3

Default = 1.0 (Real ≥ 1.0)

${K}_{f}={C}_{notch}{C}_{size}{C}_{loading}$
Where, ${C}_{notch}$ , ${C}_{size}$ , and ${C}_{loading}$ are correction factors for notch effect, size effect, and loading type influence.
3. Finish, Treatment and ${K}_{f}$ are ignored in FOS analysis (TYPE=FOS on FATPARM).