scholarly journals Lightweight Potential of Welded High-strength Steel Joints from S700 Under Constant and Variable Amplitude Loading by High-frequency Mechanical Impact (HFMI) Treatment

2015 ◽  
Vol 101 ◽  
pp. 467-475 ◽  
Author(s):  
Halid Can Yıldırım ◽  
Gary Marquis ◽  
Cetin Morris Sonsino
Keyword(s):  
High Frequency ◽  
High Strength Steel ◽  
High Strength ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Mechanical Impact ◽  
Steel Joints

Estimation of Subsurface Crack Initiation lives for a High Strength Steel under Variable Amplitude Loading Test

2003 ◽  
Vol 2003.1 (0) ◽  
pp. 169-170 ◽  
Author(s):  
Masaki NAKAJIMA ◽  
Hisatake ITOGA ◽  
Nami KAMIYA ◽  
Keiro TOKAJI ◽  
Haeng Nam KO
Keyword(s):  
Crack Initiation ◽  
High Strength Steel ◽  
High Strength ◽  
Subsurface Crack ◽  
Loading Test ◽  
Variable Amplitude Loading ◽  
Variable Amplitude

scholarly journals Variable Amplitude Loading Tests for a High Strength Steel Considering the Transition of Failure Mode in High Cycle Regime

2003 ◽  
Vol 52 (11) ◽  
pp. 1305-1310 ◽  
Author(s):  
Masaki NAKAJIMA ◽  
Keiro TOKAJI ◽  
Hisatake ITOGA ◽  
Toshihiro SHIMIZU ◽  
Nami KAMIYA
Keyword(s):  
Failure Mode ◽  
High Strength Steel ◽  
High Strength ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Loading Tests

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.

Estimation of fatigue limit in subsurface fracture for a high strength steel under variable amplitude loading tests

2003 ◽  
Vol 2003 (0) ◽  
pp. 345-346
Author(s):  
Masaki NAKAJIMA ◽  
Nami KAMIYA ◽  
Hisatake ITOGA ◽  
Keiro TOKAJI ◽  
Haeng Nam KO
Keyword(s):  
Fatigue Limit ◽  
High Strength Steel ◽  
High Strength ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Loading Tests

scholarly journals Fatigue Strength of HFMI-treated High-strength Steel Joints under Constant and Variable Amplitude Block Loading

2015 ◽  
Vol 101 ◽  
pp. 251-258 ◽  
Author(s):  
M. Leitner ◽  
S. Gerstbrein ◽  
M.J. Ottersböck ◽  
M. Stoschka
Keyword(s):  
Fatigue Strength ◽  
High Strength Steel ◽  
High Strength ◽  
Variable Amplitude ◽  
Block Loading ◽  
Steel Joints
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