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

Low-Cycle Fatigue Test of Circular Concrete Filled Tubular Columns

2008 ◽  
Vol 400-402 ◽  
pp. 873-880 ◽  
Author(s):  
Guo Wei Zhang ◽  
Yan Xiao ◽  
Sashi K. Kunnath
Keyword(s):  
Fatigue Life ◽  
Large Scale ◽  
Low Cycle Fatigue ◽  
Plastic Hinge ◽  
Cumulative Damage ◽  
Cycle Fatigue ◽  
Deformation And Failure ◽  
Tubular Columns ◽  
Critical Components ◽  
Reversed Deformation

During earthquake, the inelastic action in the plastic hinge regions of structures and bridges results in significant reversed deformation and failure of the critical components because of cumulative damage. To simulate seismic behavior of structure members and develop a simplicity damage criterion for circular concrete filled steel tubular (CFT) columns subjected to a series of earthquake excitations, an experimental study was undertaken to investigate the cumulative damage and relationship between low cycle fatigue life and displacement amplitude. Two types of large scale circular CFT columns with different kinds of seam weld and inner concrete compressive strength including nine specimens were tested under quasi static loading with constant and variable cyclic amplitudes. The test data were evaluated with the fatigue model relating deformation and fatigue life. Fatigue life expressions for application in damage-based seismic design are developed.

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