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

Kód výsledku v 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>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20102 - Construction engineering, Municipal and structural engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Young Engineers Colloquium Dresden 2023

ISBN

978-3-85748-193-2

ISSN

—

e-ISSN

—

Počet stran výsledku

2

Strana od-do

22-23

Název nakladatele

IABSE Colloqium

Místo vydání

Berlin

Místo konání akce

Dresden

Datum konání akce

30. 5. 2023

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—