Fatigue strength of welded and high frequency mechanical impact (HFMI) post-treated steel joints under constant and variable amplitude loading

2018 ◽  
Vol 163 ◽  
pp. 215-223 ◽  
Author(s):  
M. Leitner ◽  
M. Ottersböck ◽  
S. Pußwald ◽  
H. Remes
Keyword(s):  
Fatigue Strength ◽  
High Frequency ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Mechanical Impact ◽  
Treated Steel ◽  
Steel Joints

scholarly journals Sequence effect of p(1/3) spectrum loading on service fatigue strength of as-welded and high-frequency mechanical impact (HFMI)-treated transverse stiffeners of mild steel

2021 ◽  
Author(s):  
R. Schiller ◽  
D. Löschner ◽  
P. Diekhoff ◽  
I. Engelhardt ◽  
Th. Nitschke-Pagel ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Mild Steel ◽  
Welded Joints ◽  
High Frequency ◽  
Base Material ◽  
Experimental Results ◽  
Sequence Effect ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Mechanical Impact

AbstractIn the meantime, it’s well known that post-weld fatigue strength improvement techniques for welded structures like high-frequency mechanical impact (HFMI) treatment increase the fatigue live of welded joints. Although the current design recommendations for HFMI-treated welded joints give first design proposals for the HFMI-treated welds, in practice the application of HFMI treatment and the associated increase in fatigue resistance are still being discussed. There are, for example, reservations regarding the efficiency of HFMI-treated welded joints under variable amplitude loading (VAL). This paper analyses first results for the sequence effect of VAL of a p (1/3) spectrum on the service fatigue strength of HFMI-treated transverse stiffeners (TS) of mild steel (S355). Fatigue test results with random and high-low loading for the two states as-welded (AW) and HFMI-treated joints will be presented. The modified linear damage accumulation and the failure locations will be discussed. The experimental results show a clear change in the slope of the S-N curve from the as-welded (AW) state to the HFMI state and additionally in the HFMI state from constant amplitude loading (CAL) to variable amplitude loading (VAL). It was particularly noticeable in the experimental results of all tested HFMI series that the specimens failed exclusively in the base material 2–4mm before the HFMI-treated welds. The presented results of the investigations show that with application of the nominal stress concept, no sequence effect was recognizable.

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
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