Application of the High Frequency Mechanical Impact (HFMI) Method to Butt Welded Joints of High Thickness

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F23%3A00366423" target="_blank" >RIV/68407700:21110/23:00366423 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Application of the High Frequency Mechanical Impact (HFMI) Method to Butt Welded Joints of High Thickness
Original language description
Welded structures exposed to long-term cyclic loading (e.g. bridges) are susceptible to fatigue damage (fatigue cracking). Several factors influence fatigue damage - local stress, number of cycles, residual stress after welding, geometric imperfections (notches) or material imperfections (change of structure in the heat affected zone). High frequency mechanical impact (HFMI) is a method to increase fatigue life by mechanically strengthening the surface. The surface is peened by using steel spike clamped in a "gun" connected to high-pressure air. Steel spikes with a diameter 3 - 10 mm are commonly available. The peening frequency is approximately 90 - 150 Hz. The method improves local geometric imperfections (notch effect) and the local plastic deformation leads to compressive stress in the surface layer. These effects worsen the conditions for the initiation and propagation of fatigue cracks.
Czech name
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Czech description
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Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20102 - Construction engineering, Municipal and structural engineering

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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