Applying ASME and British Standard Welded Fatigue Methodologies to Thermal Fatigue Case Studies and Investigating Sensitivity to Fatigue Flaw Growth Models

by Phillip E. Prueter, P.E. / July 2015

 

Phillip Prueter presented Applying ASME and British Standard Welded Fatigue Methodologies to Thermal Fatigue Case Studies and Investigating Sensitivity to Fatigue Flaw Growth Models at the ASME Pressure Vessels & Piping Conference.

 

Below is a brief outline of his presentation:

 

  • Predicting fatigue cracking at welded locations in fixed process equipment due to cyclic loading is of great interest to the chemical, petrochemical, and nuclear industries.
  • Welded fatigue methodologies have been incorporated into both ASME and international pressure vessel Codes and Standards (based on test data).
  • Some of the challenges associated with evaluating in-service equipment for susceptibility to fatigue failure are:
    • Considering the overall scatter associated with the test data
    • Using Code-based fatigue predictions to make practical recommendations relating to establishing inspection intervals and facilitating overall life cycle management.
  • In this study, the welded fatigue methodologies outlined in ASME Section VIII Division 2 (Battelle Structural Stress Method) and British Standard PD 5500 are utilized.
  • Several case studies are investigated where transient thermal-mechanical finite element analysis (FEA) is used to develop fatigue predictions for several pieces of in-service equipment that experienced significant cracking.
  • Fracture mechanics calculations are performed to determine critical flaw sizes, and sub-critical fatigue flaw growth calculations are performed.
  • Flaw propagation rate sensitivity to varying fatigue flaw growth models is quantified and discussed.

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