Fatigue design of mild and high-strength steel cruciform joints in as-welded and HFMI-treated condition by nominal and effective notch stress approach

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem Konferenzband


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.
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.
Finally, conclusions on the impact of the base material strength as well as the applicability of the nominal and effective notch approach for cruciform steel joints in as-welded and HFMI-treated conditions are given.
TitelProceedings of the International conference on Fatigue Design 2021
PublikationsstatusAngenommen/In Druck - 2021
VeranstaltungFatigue Design 2021: 9th Edition of the International Conference on Fatigue Design - Senlis, Frankreich
Dauer: 17 Nov. 202119 Nov. 2021


KonferenzFatigue Design 2021

ASJC Scopus subject areas

  • Allgemeiner Maschinenbau

Fields of Expertise

  • Mobility & Production


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