scholarly journals Fatigue life extension of existing welded structures via high frequency mechanical impact (HFMI) treatment

2021 ◽  
Vol 239 ◽  
pp. 112234
Author(s):  
Hassan Al-Karawi ◽  
Rüdiger U. Franz von Bock und Polach ◽  
Mohammad Al-Emrani
Keyword(s):  
Fatigue Life ◽  
High Frequency ◽  
Life Extension ◽  
Welded Structures ◽  
Mechanical Impact

scholarly journals Influence of the atmosphere corrosion on the fatigue life of welded T-joints treated by high frequency mechanical impact

2019 ◽  
Vol 16 ◽  
pp. 73-80 ◽  
Author(s):  
Vitalii Knysh ◽  
Sergii Solovei ◽  
Lyudmila Nyrkova ◽  
Illya Klochkov ◽  
Svіatoslav Motrunich
Keyword(s):  
Fatigue Life ◽  
High Frequency ◽  
T Joints ◽  
Mechanical Impact

Application studies for fatigue strength improvement of welded structures by high-frequency mechanical impact (HFMI) treatment

2016 ◽  
Vol 106 ◽  
pp. 422-435 ◽  
Author(s):  
Halid Can Yıldırım ◽  
Martin Leitner ◽  
Gary B. Marquis ◽  
Michael Stoschka ◽  
Zuheir Barsoum
Keyword(s):  
Fatigue Strength ◽  
High Frequency ◽  
Welded Structures ◽  
Mechanical Impact ◽  
Fatigue Strength Improvement ◽  
Strength Improvement

scholarly journals Two-Stage Model for Fatigue Life Assessment of High Frequency Mechanical Impact (HFMI) Treated Welded Steel Details

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1318
Author(s):  
Boris Fuštar ◽  
Ivan Lukačević ◽  
Davor Skejić ◽  
Mladen Lukić
Keyword(s):  
Fatigue Life ◽  
Crack Initiation ◽  
High Frequency ◽  
Life Assessment ◽  
Stage Model ◽  
Two Stage ◽  
Welded Steel ◽  
Mechanical Impact ◽  
Steel Grades ◽  
Critical Components

Welded steel details are critical components from the aspect of fatigue. Additional fatigue resistance can be achieved by the High-Frequency Mechanical Impact (HFMI) treatment. This treatment increases the crack initiation period by improving the weld geometry, introducing compressive residual stresses, and increasing the weld toe’s hardness. The study presented in this paper is based on the development and calibration of an Initiation–Propagation-based Two-Stage Model (TSM), which is, by the combination of different methods, suitable to separately consider crack initiation and crack propagation. It is shown that a TSM is able to predict the fatigue life of as-welded and HFMI-treated welded steel details, which is proven by comparing the calculated results with the results of tests on similar details given in the literature. A parametric study of the TSM is conducted for different steel grades in order to investigate the influence of steel strength and HFMI parameters on fatigue lives of a welded steel detail with longitudinal attachment.

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