scholarly journals Fatigue Limit and Small-Crack Growth Law in Rotating Bending and Torsional Fatigue of Rolled Round Carbon Steel Bars which are Quenched and Tempered.

1993 ◽  
Vol 59 (564) ◽  
pp. 1806-1810 ◽  
Author(s):  
Hironobu Nisitani ◽  
Takayuki Fukuda
Keyword(s):  
Carbon Steel ◽  
Crack Growth ◽  
Fatigue Limit ◽  
Small Crack ◽  
Torsional Fatigue ◽  
Steel Bars ◽  
Rotating Bending ◽  
Small Crack Growth

scholarly journals The effect of oil viscosity on the fatigue limit of drilled specimens and small-crack growth law.

1988 ◽  
Vol 54 (506) ◽  
pp. 1831-1835
Author(s):  
Masahiro GOTO ◽  
Hironobu NISITANI ◽  
Yasuhiro YANAGAWA ◽  
Hiroomi MIYAGAWA
Keyword(s):  
Crack Growth ◽  
Fatigue Limit ◽  
Small Crack ◽  
Oil Viscosity ◽  
Small Crack Growth

Fatigue Crack Growth Resistance in Ni-Base Super Alloy

2007 ◽  
Vol 348-349 ◽  
pp. 541-544 ◽  
Author(s):  
Kazuhiro Morino ◽  
Norio Kawagoishi ◽  
Q. Chen ◽  
Y. Matsuyama ◽  
Y. Nakamura
Keyword(s):  
Growth Rate ◽  
Grain Size ◽  
Crack Growth ◽  
Fatigue Tests ◽  
Small Crack ◽  
Fatigue Crack Growth Resistance ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Small Crack Growth ◽  
Super Alloy

Rotating bending fatigue tests were carried out to investigate the influence of grain size on the resistance to crack growth of Ni-base super alloy, Inconel 718, using the materials with grain sizes of about 20, 50,100 and 200 たm, at room temperature. The larger grain size, the smaller crack growth rate, though the static strength was decreased with increase in grain size. The growth rate of a small crack was uniquely determined by the term ja na (Small crack growth law), where ja and a are the stress amplitude and the crack length, respectively, and n is a constant. The resistance to crack growth among materials was evaluated based on the law and showed a good correlation with tensile strength jB, meaning that fatigue life can be predicted by using only j B BB.

Analysis of Small Fatigue Crack in Al-Mg-Si Aluminum Alloy

2014 ◽  
Vol 794-796 ◽  
pp. 313-318 ◽  
Author(s):  
Takahiro Shikama ◽  
Shinji Yoshihara ◽  
Yoshimasa Takahashi ◽  
Hiroshi Noguchi
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Crack Growth ◽  
Fatigue Limit ◽  
Electron Back Scatter Diffraction ◽  
Small Crack ◽  
Small Fatigue Crack ◽  
Knee Point ◽  
Small Crack Growth ◽  
Diffraction Patterns

In general, aluminum alloy does not exhibit distinct fatigue limit (knee point) in the S-N diagram. The growth of a small fatigue crack of precipitation-hardened Al-Mg-Si system alloy (6061-T6) was investigated to clarify the mechanism of non-appearance of distinct fatigue limit (knee point) in the S-N diagram. The small crack was analysed in detail by replica method, scanning electron microscope (SEM), and Electron Back Scatter Diffraction Patterns (EBSD). On the other hand, the existence of distinct fatigue limit (knee point) of new developed aluminum alloy by adding excess Mg to the 6061 alloy was found. In this study, the resistance of small crack growth of the developed alloy was compared with standard 6061 alloy. It was revealed that the resistance of crack growth of new developed alloy was higher than that of standard 6061 alloy in short crack region (l<1.0 mm).

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