Generally, the fatigue strength of a welded structure is characterized by certain factors, which are incorporated in the detail categories and S-N curves as a statistical variation. However, digitized welding production enables the precise control and evaluation of the fatigue-related design and manufacturing parameters at different levels; this can be utilized when applying modern fatigue assessment methods. The fatigue strength of a weldment is usually evaluated based on idealized and standardized factors, but the availability of measured parameters can improve the accuracy of fatigue analysis. In this study, the validity of general design simplifications is compared with actual measurable parameters. Different factors, such as loading, global structure, structural detail, local weld geometry, initial defects and residual stresses, are identified, and their effect on the total fatigue life is evaluated. To exemplify the outcomes of different factors, the fatigue strength of a mobile working machine is evaluated using idealized and measured parameters. The results indicate that the idealized model can produce distinguishing features compared to the real structure, whereby the scatters of individual factors have an essential effect on the deviation in the fatigue assessment results. However, the case study reveals that when the fatigue analysis is conducted using the effective notch stress (ENS) method, the actual weld shape has a minor effect on the results compared to the idealized geometry. Thus, the analysis and efforts must be focused on those factors that have a considerable impact on the reliability of theoretical results in practice and a substantial effect on the quality of weldments.
Design and Fabrication Factors for the Fatigue Assessment of Welded Structures
Lect.Notes Mechanical Engineering
Vehicle and Automotive Engineering ; 2022 ; MISKOLC, Hungary September 08, 2022 - September 09, 2022
2022-09-10
15 pages
Article/Chapter (Book)
Electronic Resource
English
Fatigue Design of Welded Aluminum Structures
Online Contents | 1993
|Comparison of fatigue assessment methods of welded structures
Automotive engineering | 2008
|Comparison of fatigue assessment methods of welded structures
Tema Archive | 2008
|Multiaxial fatigue assessment of welded joints in marine structures
IOS Press | 2017
|F2008-03-020 COMPARISON OF FATIGUE ASSESSMENT METHODS OF WELDED STRUCTURES
British Library Conference Proceedings | 2008
|