Al-Li alloy AA2198's very high cycle fatigue crack initiation mechanism and its fatigue thermal effect

2015 ◽  
Author(s):  
Luopeng Xu ◽  
Xiaojian Cao ◽  
Yu Chen ◽  
Qingyuan Wang
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Thermal Effect ◽  
High Cycle Fatigue ◽  
Fatigue Crack Initiation ◽  
Cycle Fatigue ◽  
Initiation Mechanism ◽  
Very High Cycle Fatigue ◽  
Very High

On Fatigue Crack Initiation in the Matrix in Very High Cycle Fatigue Regime

2014 ◽  
Vol 783-786 ◽  
pp. 2266-2271 ◽  
Author(s):  
Guo Cai Chai
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Fatigue Damage ◽  
Strain Localization ◽  
High Cycle Fatigue ◽  
High Strain ◽  
Fatigue Crack Initiation ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High

In very high cycle fatigue, VHCF, regime, fatigue crack initiation can occur at subsurface defects such as inclusion or subsurface non-defect (matrix) origin. This paper provides a study on the fatigue crack initiation mechanisms at subsurface non-defect (matrix) origin in two metallic materials using electron backscatter diffraction and electron channeling contrast imaging. The results show that the strains in the material in the VHCF regime were highly localized, where the local maximum strain is greatly higher than the average strain value. This high strain localization can lead to the formation of fine grain zone and also fatigue damage or fatigue crack initiation at grain boundaries or twin boundaries by impingement cracking. High strain localization is caused by strain accumulation of each very small loading, and also increases the local hardness of the material. This may start quasi-cleavage crack origin, and consequently the formation of subsurface fatigue crack initiations. The results also show that fatigue damage and crack initiation mechanisms in the VHCF regime can be different in different metals due to the mechanisms for local plasticity exhaustion.

The most Influential Articles in Very High Cycle Fatigue

2015 ◽  
Vol 664 ◽  
pp. 3-11 ◽  
Author(s):  
Q.Y. Wang ◽  
Muhammad Kashif Khan
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
High Cycle Fatigue ◽  
Web Of Science ◽  
Fatigue Crack Initiation ◽  
Experimental Studies ◽  
Cycle Fatigue ◽  
Science Data ◽  
Very High Cycle Fatigue ◽  
Very High

The most influential articles in Very high cycle fatigue (VHCF) during last 20 years have been identified from web of science data. It has been found that VHCF is an important category of fatigue damage and has produced the highest impact in the field. The number of articles and their citations is continuously increasing in the overall published papers in the field of fatigue. In VHCF field, it was found that the participants of VHCF conferences from VHCF 1 to 5 are the main contributors in all the VHCF papers and in its top 100 influential papers. Majority of the articles were experimental studies. The fatigue crack initiation in the VHCF domain is considered the most important area in the field. In VHCF, the most influential papers till date have been identified. This may prove helpful to trainees mastering the most influential literature of the field as well as more established professionals searching for starting points for new investigations

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