Study on the applicability of a modified strain approach to predict the fatigue life of HFMI-treated transverse stiffeners under variable amplitude loading

This paper analyses the applicability of a modified strain approach to predict the fatigue life of HFMI-treated transverse stiffeners under variable amplitude loading (VAL) with random load sequences of a p(1/3) and linear shaped spectrum. Local stresses are determined using linear-elastic finite el...

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Bibliographic Details
Published in:Welding in the world 2024-05, Vol.68 (5), p.1259-1270
Main Authors: Löschner, Daniel, Engelhardt, Imke, Nitschke-Pagel, Thomas, Ummenhofer, Thomas
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Damage
Elastic analysis
Fatigue life
Finite element method
Hysteresis
Life prediction
Materials Science
Metallic Materials
Parameters
Random loads
Research Paper
Residual stress
Service life assessment
Solid Mechanics
Stiffeners
Strain
Surface roughness
Theoretical and Applied Mechanics
Variable amplitude loading
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Summary:This paper analyses the applicability of a modified strain approach to predict the fatigue life of HFMI-treated transverse stiffeners under variable amplitude loading (VAL) with random load sequences of a p(1/3) and linear shaped spectrum. Local stresses are determined using linear-elastic finite element analyses. The measured weld geometry and component imperfections are considered. From the hardness of the HFMI-treated zone and the base material, the elastic–plastic material behaviour and Coffin-Manson parameters to describe the damage parameter Woehler curve are estimated. Based on a hysteresis counting method (HCM), the damage for each closed hysteresis is calculated. The applied notch strain approach includes the impact of residual stresses and the influence of surface roughness. Thus far, the application of similar approaches has only been validated for welded components with comparatively low residual stresses and HFMI-treated welds subjected to constant amplitude loading. To validate the accuracy of the approach for HFMI-treated welds under variable amplitude loading, the approximated fatigue life is compared to the number of cycles derived from experimental investigations. In this study, it is shown in conjunction with experimental results that it is essential to consider the strength of the base material near the weld when assessing the service life. This area can be more critical than the HFMI-treated weld toe.
ISSN:0043-2288
1878-6669
DOI:10.1007/s40194-024-01746-0