The effect of pitting corrosion on the safe-life prediction of the Royal Australian Air Force P-3C Orion aircraft

Shekhter, Alexandra; Crawford, Bruce R.; Loader, Chris; Hu, Weiping

doi:10.1016/j.engfailanal.2015.05.020

Cited by 15 publications

(12 citation statements)

References 18 publications

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“…Such a problem always appears on ageing fuselage and wing subjected to corrosion due to environmental exposure. For example, pitting corrosion due to the electrochemical attack has been found on metal surfaces or within teardown airframe (Shekhter et al., 2015). Consequently, multiple cracks often initiate at corrosion pits, substantially reducing fatigue lifetimes and residual strengths of ageing airframes owing to the inevitably interaction between adjacent multiple cracks.…”

Section: Introductionmentioning

confidence: 99%

A modified accumulation damage algorithm for predicting corrosion fatigue life by considering load interaction for aluminum alloys

Liu

Xiong

Wang

2018

International Journal of Damage Mechanics

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Fatigue tests were conducted on centrally notched aluminum alloys 2524-T3 and 7050-T7451 under constant-amplitude and actual random spectrum loading in dry air and in 3.5% NaCl sodium chloride solution, and fatigue damage mechanisms under the load interaction and the corrosion effect on fatigue crack initiation and propagation were deduced from fractographic analysis. Pure and corrosion fatigue lives under actual random spectrum load history were modelled based on a modified accumulation damage algorithm accounting for the load interaction. More reasonable predictions were achieved from the modified algorithm proposed in the paper than from the Palmgren–Miner rule.

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Section: Introductionmentioning

confidence: 99%

A modified accumulation damage algorithm for predicting corrosion fatigue life by considering load interaction for aluminum alloys

Liu

Xiong

Wang

2018

International Journal of Damage Mechanics

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“…The stress concentration factor (SCF) is the ratio of the local maximum stress to the nominal stress. Plenty of methods to calculate the stress concentration factors have been developed for elliptic holes at present [22,23], however, the objects of the above studies are concentrated on penetrating small holes, while the pits studied are usually formed on the surface of steel strands that are similar to non-penetrating oval holes. Complicated mechanics of non-penetrating elliptical holes increase the difficulty in finding its analytical solution.…”

Section: The Finite Element Model Of Pitmentioning

confidence: 99%

Numerical and Experimental Study on the Steel Strands under the Coupling Effect of a Salt Spray Environment and Cyclic Loads

Yao

et al. 2020

Materials

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Composed of multi-strand parallel high-strength wires or steel strands, the stayed cables have been widely used recently in stayed bridges or suspension bridges owing to their light weight and high bearing capacity, especially the steel strands. Meanwhile, chloride-induced corrosion of steel strands is one of the most considerable factors for the durability of the stayed cable exposed to marine environments. The fatigue caused by both cyclic loading and corrosion can affect the life of the steel strands. Besides, the current studies related to the effects of the aforementioned two impact factors on the life of the steel strands either considered the fatigue only, or took the two impact factors into account separately. The coupling effects of fatigue and corrosion on the life of the steel strands are required to be further explored and discussed. Consequently, it is essential to create a model to predict the life of the steel strands with the coupling effects taken into consideration. In this paper, an indoor physical experiment of the steel strand specimens exposed to marine tidal environment was carried out. To avoid accidental errors, the whole specimens were divided into 20 groups, with each group having two steel wires with a 5 days, 10 days, and 15 days cycle for the test. The corrosion of steel strands was observed at various exposure times and it was found that the pits were formed on the surface with the chloride ion erosion to the steel strands. Deeper and sharper pits result in greater pitting-local stress and a shorter fatigue life, which is also the main reason for reducing the carrying capacity of the steel strands. However, a detailed description for this problem is lacking in current domestic and foreign literature, because the pit is hard to predict owing to its complex nature. In order to simulate the evolution of the pits, the stochastic pitting-corrosion model was set up by the neural network method to evaluate the pit evolutions over time. In addition, an empirical formula consisting of length–width ratios, length–depth ratios, and depth-to-width ratios of the pits was obtained to determine the stress concentration factor based on the multi-dimensional linear regression method. The fatigue notch factor of components can be deduced by the stress concentration factor, and the life of the steel strands can be deduced by both of them. The findings are expected to be useful in realistically predicting the durability of wire structures.

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“…This cost includes corrosion maintenance, inspection costs, aircraft downtime, etc. Furthermore, as reported in [ 4 , 5 ], corrosion is one of the leading causes of 10% to 25% of structural failures of aircrafts and is one of the leading causes of failure based on the number of aircraft accidents, which makes this problem significant and still current. With a continuous extension of the operational life of aircrafts, the problem of corrosion is receiving more and more attention.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Hidden Corrosion Growth in Aircraft Structures Based on D-Sight Inspections and Image Processing

Katunin

Nagode

Oman

et al. 2022

Sensors

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Hidden corrosion in aircraft structures, not detected on time, can have a significant influence on aircraft structural integrity and lead to catastrophic consequences. According to the widely accepted damage tolerance philosophy, non-destructive inspections are performed to assess structural safety and reliability. One of the inspection techniques used for such an inspection is the optical D-Sight technique. Since D-Sight is used primarily as a qualitative method, it is difficult to assess the evolution of a structural condition simply by comparing the inspection results. In the following study, the method to monitor hidden corrosion growth is proposed on the basis of historical data from D-Sight inspections. The method is based on geometric transforms and segmentation techniques to remove the influence of measurement conditions, such as the angle of observation or illumination, and to compare corroded regions for a sequence of D-Sight images acquired during historical inspections. The analysis of the proposed method was performed on the sequences of D-Sight images acquired from inspections of Polish military aircraft in the period from 2002 to 2017. The proposed method represents an effective tool for monitoring hidden corrosion growth in metallic aircraft structures based on a sequence of D-Sight images.

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The effect of pitting corrosion on the safe-life prediction of the Royal Australian Air Force P-3C Orion aircraft

Cited by 15 publications

References 18 publications

A modified accumulation damage algorithm for predicting corrosion fatigue life by considering load interaction for aluminum alloys

A modified accumulation damage algorithm for predicting corrosion fatigue life by considering load interaction for aluminum alloys

Numerical and Experimental Study on the Steel Strands under the Coupling Effect of a Salt Spray Environment and Cyclic Loads

Monitoring of Hidden Corrosion Growth in Aircraft Structures Based on D-Sight Inspections and Image Processing

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