Life Prediction of Aluminum Alloy Structure Subjected to Corrosion Fatigue and Corrosion Damage

2012 ◽  
Vol 166-169 ◽  
pp. 1887-1890
Author(s):  
You Hong Zhang ◽  
Qian Zhang ◽  
Xin Long Chang ◽  
Chun Guo Yue ◽  
Shi Ying Zhang ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Fatigue ◽  
Life Prediction ◽  
Corrosion Damage ◽  
Simulation Method ◽  
Life Cycles ◽  
Ansys Software ◽  
Alloy Structure ◽  
Corrosion Fatigue Crack ◽  
Corrosion Fatigue Crack Growth

The strength of the aging structure deteriorates mainly as a result of corrosion and fatigue damage. In this paper, the life prediction methods of corroded and corrosion fatigued aluminum alloy structure were proposed. The stress multiplication of aluminum alloy structure subjected to corrosion damage was simulated by ANSYS software. We proposed the AFGROW software simulation method to predicate the numerical simulation of corrosion fatigue crack growth. At last, the life cycles of structures subjected to corrosion damage and corrosion fatigue were estimated, and a very good performance of the proposed methods are achieved after validation with the experimental data.

Sustainment Engineering and Residual Life Prediction of Aluminum Alloy Structure at Service Environment

2013 ◽  
Vol 661 ◽  
pp. 124-127
Author(s):  
Qian Zhang ◽  
Gang Liu ◽  
Cun Li Wu
Keyword(s):  
Aluminum Alloy ◽  
Life Prediction ◽  
Structural Integrity ◽  
Residual Life ◽  
Fatigue Cracks ◽  
Corrosion Damage ◽  
Life Extension ◽  
Alloy Structure ◽  
Service Environment ◽  
Residual Life Prediction

The effects of service environment will cause corrosion damage and fatigue cracks to initiate and grow, compromising structural integrity of the aircraft aluminum alloy structure. To develop an effective inspection and maintenance-scheduling program that takes advantage of life extension technologies, the sustainment engineering and residual life prediction method of aging aircraft aluminum alloy structure at service environment was proposed in this article. The whole algorithm of the sustainment engineering was described and the included situations of repairs, corrosion damage and widespread fatigue damage on aircraft structures were presented. At last, combining the results of FEM calculation with the AFGROW software of crack growth analyses, the residual life of corroded aluminum alloy structure was estimated.

Corrosion Fatigue of Aircraft Aluminum Alloy Structure in the Coastal Environment and Improvements

2010 ◽  
Vol 118-120 ◽  
pp. 136-140
Author(s):  
Ling Cai Huang ◽  
Bo Pan ◽  
Tong Min Jiang ◽  
Mei Jun Li
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Fatigue Failure ◽  
Corrosion Fatigue ◽  
Coastal Environment ◽  
Chloride Ions ◽  
Fatigue Crack Propagation Rate ◽  
Alloy Structure ◽  
Expansion Formula ◽  
Corrosion Fatigue Crack

Corrosion-fatigue failure of aluminum alloy stringer on the tour airplane servicing in the coastal environment of the Fiji Islands was discussed. Through analysis on surface topographies and components of aluminum alloy structure and consideration of service environment, it showed that the chloride ions, the aging failure of structure coating and the applied stress are the main reasons for corrosion fatigue failure of aircraft aluminum alloy structure. The corrosion-fatigue crack propagation rate of structural components in the coastal environment was analyzed by derivation of crack expansion formula. Findings showed that the corrosion-fatigue crack will expand rapidly until the structure fractures after the aircraft aluminum alloy structure operates nearly 10800 cycles during the crack growth phase. According to the corrosion-fatigue failure analysis of aluminum alloy structure, some improvements were proposed to slow down the corrosion-fatigue failure of aluminum alloy structure in the coastal environment.

Corrosion-Fatigue Crack Growth in Age-Hardened Al Alloys: Examples of Failures and Explanations for Fractographic Observations

2014 ◽  
Vol 891-892 ◽  
pp. 248-253 ◽  
Author(s):  
Rohan Byrnes ◽  
Noel Goldsmith ◽  
Mark Knop ◽  
Stan Lynch
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Corrosion Fatigue ◽  
Compact Tension ◽  
Al Alloys ◽  
Corrosion Fatigue Crack ◽  
Crack Tips ◽  
Corrosion Fatigue Crack Growth ◽  
Additional Support

The characteristics of corrosion-fatigue in age-hardened Al alloys, e.g. brittle striations on cleavage-like facets, are described, with reference to two examples of component failure. Mechanisms of corrosion fatigue (and explanations for fracture-surface features) are then reviewed. New observations of corrosion-fatigue crack growth for 7050-T7451 alloy compact-tension specimens tested in aqueous environments using a constant (intermediate) ΔK value but different cycle frequencies are then described and discussed. These observations provide additional support for a hydrogen-embrittlement process involving adsorption-induced dislocation-emission from crack tips.

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