Fatigue assessment of as-welded and HFMI-treated high-strength steel joints under variable amplitude loading using local approaches DOI Creative Commons
Antti Ahola, Martin Leitner, Kiia Grönlund

et al.

Welding in the World, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 7, 2025

Abstract Among various post-weld treatment techniques, the high-frequency mechanical impact (HFMI) is a robust technique to introduce an enhancement in fatigue strength of welded high-strength steel joints. In engineering applications, however, structures usually undergo fluctuating cyclic load conditions resulting variable amplitude (VAL) conditions. The objective this work validate use local notch stress approaches assess as-welded (AW) and HFMI-treated joints made ultra-high-strength steels under VAL 4R method applied as effective stress-based concept considering mean correction via four parameters, i.e., material R m , ratio residual stresses σ res weld toe radius r true . To method, study extracts re-analyzes test data published literature on CAL studies. Finite element analyses are carried out determine (ENS) for evaluation using ENS method. results re-evaluation conducted showed that existing design curves provide conservative assessments. However, applying equivalent data, experimental damage parameters D > 1.0 AW with respect data. was analyzed Master Curve, which obtained assessments both conditions, well and, thus applicability further validated by

Language: Английский

Fatigue assessment of as-welded and HFMI-treated high-strength steel joints under variable amplitude loading using local approaches DOI Creative Commons
Antti Ahola, Martin Leitner, Kiia Grönlund

et al.

Welding in the World, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 7, 2025

Abstract Among various post-weld treatment techniques, the high-frequency mechanical impact (HFMI) is a robust technique to introduce an enhancement in fatigue strength of welded high-strength steel joints. In engineering applications, however, structures usually undergo fluctuating cyclic load conditions resulting variable amplitude (VAL) conditions. The objective this work validate use local notch stress approaches assess as-welded (AW) and HFMI-treated joints made ultra-high-strength steels under VAL 4R method applied as effective stress-based concept considering mean correction via four parameters, i.e., material R m , ratio residual stresses σ res weld toe radius r true . To method, study extracts re-analyzes test data published literature on CAL studies. Finite element analyses are carried out determine (ENS) for evaluation using ENS method. results re-evaluation conducted showed that existing design curves provide conservative assessments. However, applying equivalent data, experimental damage parameters D > 1.0 AW with respect data. was analyzed Master Curve, which obtained assessments both conditions, well and, thus applicability further validated by

Language: Английский

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