Effects of ultrasonic impact treatment on fatigue behavior of naturally exfoliated aluminum alloys

Liu, Min; Chen, W.R.; Bellinger, Nicholas C.

doi:10.1016/j.ijfatigue.2007.05.002

Cited by 34 publications

(20 citation statements)

References 4 publications

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“…The degradation of aircraft mechanical components is also connected with mechanical, and corrosion-mechanical (macrocracks) defects, which lead to a decrease in its load-bearing capacity (Ostash et al, 2006). Corrosion has many forms and affects most structural alloys found in airframes: of particular importance is pitting and intergranular corrosion, which can develop into fatigue cracks, stress corrosion cracks or exfoliation (Liao et al, 2008). In this light, it is plausible that corrosion and mechanical stress of some aircraft components may release metallic particles into the environment.…”

Section: Other Mechanical Componentsmentioning

confidence: 99%

Aircraft engine exhaust emissions and other airport-related contributions to ambient air pollution: A review

Masiol

Harrison

2014

Atmospheric Environment

381

228

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h i g h l i g h t sAviation is globally growing (þ5% y À1 ) mainly driven by developing countries. Airport operations cause an increase in ground-level pollution. Chemical and physical properties of the emitted gases and particles are reviewed. An overview of other additional sources within airports is provided. Future research needs on aircraft emissions are highlighted. a b s t r a c tCivil aviation is fast-growing (about þ5% every year), mainly driven by the developing economies and globalisation. Its impact on the environment is heavily debated, particularly in relation to climate forcing attributed to emissions at cruising altitudes and the noise and the deterioration of air quality at groundlevel due to airport operations. This latter environmental issue is of particular interest to the scientific community and policymakers, especially in relation to the breach of limit and target values for many air pollutants, mainly nitrogen oxides and particulate matter, near the busiest airports and the resulting consequences for public health. Despite the increased attention given to aircraft emissions at groundlevel and air pollution in the vicinity of airports, many research gaps remain. Sources relevant to air quality include not only engine exhaust and non-exhaust emissions from aircraft, but also emissions from the units providing power to the aircraft on the ground, the traffic due to the airport ground service, maintenance work, heating facilities, fugitive vapours from refuelling operations, kitchens and restaurants for passengers and operators, intermodal transportation systems, and road traffic for transporting people and goods in and out to the airport. Many of these sources have received inadequate attention, despite their high potential for impact on air quality. This review aims to summarise the state-of-the-art research on aircraft and airport emissions and attempts to synthesise the results of studies that have addressed this issue. It also aims to describe the key characteristics of pollution, the impacts upon global and local air quality and to address the future potential of research by highlighting research needs. Atmospheric Environment 95 (2014) 409e455 x Partitioning coefficient M. Masiol, R.M. Harrison / Atmospheric Environment 95 (2014) 409e455 410

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Section: Other Mechanical Componentsmentioning

confidence: 99%

Aircraft engine exhaust emissions and other airport-related contributions to ambient air pollution: A review

Masiol

Harrison

2014

Atmospheric Environment

381

228

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“…17,18 In addition, current studies on the UPT of welded joint mainly focus on fatigue strength and crack propagation. 19,20 However, the effect of UPT on the changes of fatigue crack initiation mechanism, which is the key factor that controls the fatigue behaviours over a long life range of greater than 10 7 cycles, has not been fully investigated for FSW joints.…”

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confidence: 99%

Improvement of very high cycle fatigue properties in an AA7075 friction stir welded joint by ultrasonic peening treatment

Yang

Liu

et al. 2016

Fatigue Fract Eng Mat Struct

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The present paper aims to investigate the effect of ultrasonic peening treatment on the very high cycle fatigue resistance of an AA7075 friction stir welded joint. Microscopy observation, microhardness and X‐ray diffraction measurements were carried out to characterize the treated surface of peened specimens. Fatigue crack initiation sites were investigated through scanning electron microscope, and the role of enhanced surface on fatigue resistance was analyzed. The results indicate that a sensible fatigue strength improvement can be obtained through application of ultrasonic peening treatment and that fatigue cracks can initiate from the interior of the specimen. To clarify the fatigue failure mechanism, we analyzed the microstructure characteristics, compressive residual stress profile and intermetallic inclusion distribution in the surface layers, and we discussed the capability of ultrasonic peening treatment to hinder the surface crack initiation.

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“…UIT has been shown to lead to the formation of highly developed dislocation/grain microstructures and grain refinement . This causes compressive residual stresses and provides significant hardening in the material's surface layer, thereby increasing the material's resistance to fatigue, wear, and corrosion …”

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confidence: 99%

“…UIT involves the use of a pin tool that behaves like an ultrasonic transducer that outputs continuous ultrasonic impulse/vibrations at the ultrasonic transducer output end to the treated surface. The technology is based on converting the ultrasonic oscillations of the transducer into impulses of ultrasonic impacts at the output . The output employs needle indenters, strengthened with hard materials such as carbide containing alloys or artificial diamonds that are directed at the surface and are in continuous contact with the surface of the material .…”

mentioning

confidence: 99%

“…The technology is based on converting the ultrasonic oscillations of the transducer into impulses of ultrasonic impacts at the output . The output employs needle indenters, strengthened with hard materials such as carbide containing alloys or artificial diamonds that are directed at the surface and are in continuous contact with the surface of the material . The continuous ultrasonic impact creates high rate straining and heating near the material surface resulting in SPD.…”

mentioning

confidence: 99%

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Microstructural Evolution of Severely Plastically Deformed Sensitized Aluminum 5456‐H116 Treated by Ultrasonic Impact Treatment

Tran

Salamanca‐Riba

2013

Adv Eng Mater

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Effects of ultrasonic impact treatment on fatigue behavior of naturally exfoliated aluminum alloys

Cited by 34 publications

References 4 publications

Aircraft engine exhaust emissions and other airport-related contributions to ambient air pollution: A review

Aircraft engine exhaust emissions and other airport-related contributions to ambient air pollution: A review

Improvement of very high cycle fatigue properties in an AA7075 friction stir welded joint by ultrasonic peening treatment

Microstructural Evolution of Severely Plastically Deformed Sensitized Aluminum 5456‐H116 Treated by Ultrasonic Impact Treatment

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