Low-cycle fatigue life of SiC-particulate-reinforced Al-Si cast alloy composites with tensile mean strain effects

1999 ◽  
Vol 21 (10) ◽  
pp. 1019-1032 ◽  
Author(s):  
S.K. Koh ◽  
S.J. Oh ◽  
C. Li ◽  
F. Ellyin
Keyword(s):  
Fatigue Life ◽  
Cast Alloy ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Strain Effects ◽  
Particulate Reinforced ◽  
Mean Strain

Cumulative Damage and Effect of Mean Strain in Low-Cycle Fatigue of a 2024-T351 Aluminum Alloy

1966 ◽  
Vol 88 (4) ◽  
pp. 801-810 ◽  
Author(s):  
Kiyotsugu Ohji ◽  
W. R. Miller ◽  
Joseph Marin
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Low Cycle Fatigue ◽  
Cumulative Damage ◽  
Strain Condition ◽  
Cycle Fatigue ◽  
History Of ◽  
Mean Strain ◽  
Strain Cycling ◽  
Cycling Behavior

By assuming a linear cumulative damage hypothesis for strain cycling, theories are developed in this paper for fatigue life under varying strain amplitude, residual ductility after a given history of strain cyling, and life under mean strain condition. These predictions are based on uniaxial completely reversed cycling behavior. The expressions obtained were compared with the experimental results on 2024-T351 aluminum alloy as well as other data available in the literature. The agreements between theories and experiments were found to be satisfactory.

1132 Effect of Mean Strain on Multiaxial Low Cycle Fatigue Life of Ti-6Al-4V under Non-proportional Loading

2010 ◽  
Vol 2010 (0) ◽  
pp. 1165-1167
Author(s):  
Min WU ◽  
Takamoto ITOH ◽  
Yuuta SHIMIZU ◽  
Hiroshi NAKAMURA ◽  
Masahiro TAKANASHI
Keyword(s):  
Fatigue Life ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Proportional Loading ◽  
Mean Strain

Multiaxial low cycle fatigue life of Ti-6Al-4V under non-proportional loading with mean strain

2017 ◽  
Vol 90 ◽  
pp. 165-173 ◽  
Author(s):  
Takamoto Itoh ◽  
Hiroshi Nakamura ◽  
Masahiro Takanashi ◽  
Min Wu
Keyword(s):  
Fatigue Life ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Proportional Loading ◽  
Mean Strain

Low Cycle Fatigue Behavior of N80Q Steel under the Influence of Mean Strains

2019 ◽  
Vol 944 ◽  
pp. 1067-1075
Author(s):  
Wen Lan Wei ◽  
Li Hong Han ◽  
Yao Rong Feng ◽  
Jian Xun Zhang ◽  
Hang Wang
Keyword(s):  
Electron Microscopy ◽  
Fatigue Life ◽  
Strain Amplitude ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Thermal Recovery ◽  
Cycle Fatigue ◽  
Compression Load ◽  
The Mean ◽  
Mean Strain

The service conditions of thermal recovery wells make the casing repeatedly bear the tension and compression load and form low cycle fatigue. Meanwhile, many factors, such as pre-strain and creep, lead to the formation of asymmetrical low cycle fatigue (R≠-1), which is the low cycle fatigue behavior under the influence of mean strain. This work studied the effect of mean strain on low cycle fatigue behavior of N80Q steel. Different strain amplitude conditions were selected for low cycle fatigue test, which were 0.5%, 0.7%, 1.0%, 1.5% and 2.0% respectively. Then tests at mean strains of-0.8%, 0%, 0.5% and 1.0% were conducted under constant strain amplitude. And the microstructure and fracture surface of the material after the tests were characterized using scanning electron microscopy and transmission electron microscopy, respectively. The results show that the mean strain makes the fatigue life reduce significantly under the condition of constant strain amplitude, and is related to the amplitude of the mean strain. The value of the mean strain and the strain amplitude will ultimately affect the fatigue life. And the fatigue life is related to the maximum absolute value of strain and has a linear relationship in the double logarithmic coordinate system. The SEM results of fracture morphology show that the brittleness feature of the crack growth area with high mean strain decreases significantly. And the fracture cross-section observation shows that the crack propagation is transgranular propagation. The TEM results show that a large number of dislocations pile-up is formed at lath subgrain boundary.

Low-Cycle Fatigue Performance of Buckling Restrained Braces and Assessment of Cumulative Damage under Severe Earthquakes

2018 ◽  
Vol 763 ◽  
pp. 867-874
Author(s):  
Yu Shu Liu ◽  
Ke Peng Chen ◽  
Guo Qiang Li ◽  
Fei Fei Sun
Keyword(s):  
Fatigue Life ◽  
Energy Dissipation ◽  
Structural Reliability ◽  
Low Cycle Fatigue ◽  
Engineering Application ◽  
Fatigue Performance ◽  
Cycle Fatigue ◽  
Variable Amplitude ◽  
Buckling Restrained Braces ◽  
Energy Dissipation Devices

Buckling Restrained Braces (BRBs) are effective energy dissipation devices. The key advantages of BRB are its comparable tensile and compressive behavior and stable energy dissipation capacity. In this paper, low-cycle fatigue performance of domestic BRBs is obtained based on collected experimental data under constant and variable amplitude loadings. The results show that the relationship between fatigue life and strain amplitude satisfies the Mason-Coffin equation. By adopting theory of structural reliability, this paper presents several allowable fatigue life curves with different confidential levels. Besides, Palmgren-Miner method was used for calculating BRB cumulative damages. An allowable damage factor with 95% confidential level is put forward for assessing damage under variable amplitude fatigue. In addition, this paper presents an empirical criterion with rain flow algorithm, which may be used to predict the fracture of BRBs under severe earthquakes and provide theory and method for their engineering application. Finally, the conclusions of the paper were vilified through precise yet conservative prediction of the fatigue failure of BRB.

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