scholarly journals RESEARCH ON THE EXTREMELY LOW CYCLE FATIGUE FRACTURE LIMIT OF STRUCTURAL STEEL FROM THE VIEW POINT OF DAMAGE ENERGY : Cumulative damage energy and effect of the large prestrain on fracture

2000 ◽  
Vol 65 (534) ◽  
pp. 9-16 ◽  
Author(s):  
Nobuyuki NAKAJIMA ◽  
Minoru YAMADA
Keyword(s):  
Structural Steel ◽  
Fatigue Fracture ◽  
Low Cycle Fatigue ◽  
Cumulative Damage ◽  
Cycle Fatigue ◽  
View Point

Performance Assessment of Steel Components

1987 ◽  
Vol 3 (1) ◽  
pp. 27-41 ◽  
Author(s):  
Helmut Krawinkler
Keyword(s):  
Performance Assessment ◽  
Structural Steel ◽  
Seismic Performance ◽  
Damage Accumulation ◽  
Low Cycle Fatigue ◽  
Cumulative Damage ◽  
Structural Performance ◽  
Cycle Fatigue ◽  
Performance Parameters ◽  
Analytical Procedures

This paper presents a methodology for the assessment of cumulative damage in structural steel components subjected to cyclic inelastic loading histories of the type experienced in earthquakes. The methodology is based on low-cycle fatigue concepts and the hypothesis of linear damage accumulation. It will be shown that seismic performance of a component depends on two structural performance parameters and on the number and amplitudes of all inelastic excursions and not only on the maximum excursion. Experimental and analytical procedures for obtaining the parameters needed for a performance assessment are suggested in the paper.

Ultra-low Cycle Fatigue Fracture of High-Strength Steel Q460C and Its Weld

2018 ◽  
Vol 30 (11) ◽  
pp. 04018280 ◽  
Author(s):  
Fei Yin ◽  
Lu Yang ◽  
Liang Zong ◽  
Xiyue Liu ◽  
Yuanqing Wang
Keyword(s):  
Fatigue Fracture ◽  
High Strength Steel ◽  
Low Cycle Fatigue ◽  
High Strength ◽  
Cycle Fatigue

Investigation on Fatigue Damage of the Al5Zn2Mg High Strength Aluminum Alloy

2013 ◽  
Vol 721 ◽  
pp. 12-15 ◽  
Author(s):  
Xian Liang Sun ◽  
Ai Qin Tian ◽  
Wen Bin Chen ◽  
San San Ding ◽  
Shang Lei Yang
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Grain Boundary ◽  
Fatigue Fracture ◽  
Low Cycle Fatigue ◽  
High Strength ◽  
Alloy Sample ◽  
Cycle Fatigue ◽  
High Strength Aluminum Alloy ◽  
Propagation Zone

The fatigue fracture and the microstructure of Al5Zn2Mg high strength aluminum alloy were observed by OM, SEM and TEM, and the low cycle fatigue properties were tested and analyzed. The results of experimentation show that the low cycle fatigue life of Al5Zn2Mg high strength aluminum alloy is 9.28×104 cycle in R=0.1, f=8Hz, and σmax=0.75σb. The tensile strength is 444MPa. The fatigue fracture is composed of the initiation zone, the propagation zone, and the sudden fracture zone, which is characteristic of a mixed-type fatigue fracture. The fatigue crack initiates in the surface of Al5Zn2Mg aluminum alloy sample, while there is no fatigue striation in fatigue crack propagation zone. The η′(MgZn2) transitional strengthening phases are precipitated in Al5Zn2Mg aluminum alloy, and mostly distributed in grain boundary. The diameter of η′ strengthening phase is fine, about is 10nm. There is none precipitated zone in width nearby the grain boundary

Extremely - low cycle fatigue fracture of Q235 steel at different stress triaxialities

2020 ◽  
Vol 169 ◽  
pp. 106060
Author(s):  
Zeshen Li ◽  
Jinjun Xu ◽  
Cristoforo Demartino ◽  
Keshi Zhang
Keyword(s):  
Fatigue Fracture ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Q235 Steel
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