APPLICATION OF ASME CODE AND WELDMENT FATIGUE DESIGN GUIDELINES TO LIFE PREDICTION UNDER MULTIAXIAL STRESSES
Abstract
Fatigue life prediction is an essential aspect of designing weldments for cyclic load conditions. Validated by fatigue experiments of welded tubular joints, this work employs nominal stress-life (S-N) approach for life prediction under multiaxial loading conditions based on weld metal properties and weldment geometry. By defining axial and shear fatigue notch factors using the volume method of the theory of critical distance in finite element environment, stress-life curves of the welded joint were generated based on weld metal’s S-N behavior. To account for the multiaxiality of the applied loading, ASME code was used for proportional and nonproportional loading conditions with equivalent stress concept. Additionally, predictions were made according to the recommended fatigue classes by the International Institute of Welding (IIW) and Eurocode 3 (EC3). The predictions by the ASME code were mostly conservative and the IIW procedure resulted in more accurate life estimations than EC3 due to mean stress correction and accounting for proportionality of the multiaxial loading cases.
Publication Title
ASME International Mechanical Engineering Congress and Exposition Proceedings Imece
Recommended Citation
Razi, A., & Fatemi, A. (2025). APPLICATION OF ASME CODE AND WELDMENT FATIGUE DESIGN GUIDELINES TO LIFE PREDICTION UNDER MULTIAXIAL STRESSES. ASME International Mechanical Engineering Congress and Exposition Proceedings Imece, 8 https://doi.org/10.1115/IMECE2025-164875
