Bulk Data Entry Defines properties for Seam Weld Fatigue Analysis.


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)


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

No default (Integer > 0)

BRATIO Critical bending ratio.

Default = 0.5 (Real > 0.0)

TREF Reference thickness for thickness effect consideration. 1

Default = 25.0 (Real > 0.0)

TREF_N Exponent for the thickness effect consideration. 1

Default = 0.2 (Real ≥ 0.0)

EVALDIS Evaluation distance in Joint Line method. 2
MINAVG (Default)
Automatically determine the evaluation distance from the weld line for Stress calculation.
The specified Real value is directly used as the evaluation distance from the Weld line for Stress calculation.

(Real ≥ 0.0)


  1. TREF is used to define the reference thickness for thickness effect consideration. If the thickness of a shell (T) is greater than the specified value (TREF), and the THCKCORR field on the FATPARM entry is set to YES, then the thickness effect is included by increasing the stress ( σ i j MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeq4Wdm3aaS baaSqaaiaadMgacaWGQbaabeaaaaa@39C3@ ) based on:
    σ ij = σ ij ( T TREF ) TREF _ N
  2. The distance at which the stresses are evaluated for a particular weld is defined by EVALDIS. The stresses are actually evaluated at the element corners (based on STRESS output request or PARAM,CNST4FAT), and then the stresses are interpolated to the stress evaluation point (Figure 1) for each element. This stress is used in further fatigue calculations.
    Figure 1.