Abstract
According to the Recommendations for Fatigue Design of Welded Joints and Components by the International Institute of Welding (IIW), the fatigue strength of welded steel joints is in general independent of the base material strength. Post-treatment methods, such as the High Frequency Mechanical Impact (HFMI) treatment, can significantly increase the fatigue performance of welded joints especially in case of high-strength steel applications, which is already considered within the IIW Recommendations for the HFMI Treatment. This paper firstly investigates the effect of the base material strength on the fatigue resistance of welded and HFMI-treated steel joints. Therefore, mild steel S355 and high-strength steel S700 cruciform joints are cyclically tested in both conditions and the statistically evaluated S/N-curves are compared. The results reveal an increase of the high-cycle fatigue strength by the HFMI-treatment by a factor of 1.35 in case of the S355, and of 1.59 for the S700 specimens. Secondly, the test results are assessed by the fatigue design curves of the corresponding structural detail within the IIW-recommendations using the nominal stress concept. Moreover, the applicability of the procedure applying the effective notch approach is analyzed. In order to numerically evaluate the effective notch stress, the geometry of the cruciform joint is modelled according to the given guidelines within the recommendations applying a reference radius of 1 mm at the weld toe for both conditions. On the basis of the numerically computed effective notch stress, a local fatigue design is performed for all test series, which reveals sound accordance between the recommended design curves and the statistically evaluated fatigue test S/N-curves.
Original language | English |
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Title of host publication | Fatigue Design 2021, International Conference Proceedings |
Editors | Fabien Lefebvre, Pascal Souquet |
Pages | 477-489 |
Number of pages | 13 |
Volume | 38 |
Edition | C |
DOIs | |
Publication status | Published - 2021 |
Event | Fatigue Design 2021: 9th Edition of the International Conference on Fatigue Design - Senlis, France Duration: 17 Nov 2021 → 19 Nov 2021 http://fatiguedesign.org/ |
Publication series
Name | Procedia Structural Integrity |
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Conference
Conference | Fatigue Design 2021 |
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Country/Territory | France |
City | Senlis |
Period | 17/11/21 → 19/11/21 |
Internet address |
Keywords
- Effective notch stress approach
- Fatigue design
- HFMI-treatment
- High-strength steel
- Welded joints
ASJC Scopus subject areas
- General Engineering
- Mechanics of Materials
- Mechanical Engineering
- General Materials Science
- Civil and Structural Engineering
Fields of Expertise
- Mobility & Production