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)

  

Comments

  1. If shell elements are used, it is necessary to specify the appropriate layer or Surface of results to use Top or Bottom. Worst is the worst result of Top and Bottom (the one with larger damage).
  2. Fatigue strength reduction factor takes into account the effect of notch effects, size effects, and loading type influence.(1)
    K f = C n o t c h C s i z e C l o a d i n g

    Where, C n o t c h , C s i z e , and C l o a d i n g 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).
  4. This card is represented as a load collector in HyperMesh.