Laser-ultrasonic detection of hidden corrosion in aircraft lap joints: Results from corroded samples

Choquet, Marc; Lévesque, Daniel; Massabki, Maroun; Néron, C.; Bellinger, Nicholas C.; Forsyth, David; Chapman, C. E.; Gould, R. W.; Komorowski, Jerzy P.; Monchalin, Jean‐Pierre

doi:10.1063/1.1373773

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…Laser ultrasound measurements are typically optical diffraction limited (1-5 microns) for spatial resolution limits which are due to the use of a focused laser beam as the probe. Material loss level measurements have recently reported below 1% in lap-joint specimens [6].…”

Section: Ultrasonic Imaging Methodsmentioning

confidence: 99%

Advanced imaging of hidden damage under aircraft coatings

Cooney

Blackshire

2006

SPIE Proceedings

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The external coating systems of nearly all military aircraft are stripped to bare metal during programmed depot maintenance cycles. This paint stripping process has become cost prohibitive in recent years, and is expected to continue to be a major and escalating problem for the sustainment of an aging Air Force fleet. Although a number of competing factors come into play, the key reason behind current paint stripping practices is centered on requirements for visual inspection of the aircraft structure to determine if corrosion and/or fatigue damage is present. In recent years, a number of advancements have been made in the area of nondestructive evaluation (NDE) that provide new inspection capabilities for aircraft skins without the requirement for protective coating removal. In this effort, several advanced imaging methods are evaluated for hidden damage detection and quantification through typical aircraft coating systems. A number of measurement examples are provided for engineered and realistic aircraft reference standards with variations in coating type, coating thickness, hidden damage type, and component complexity being considered. A comparison of measurement sensitivity, resolution, area coverage, ease-of-use, quantitative assessment, data processing requirements, and inspection speed are also made. It is anticipated that the use of one or more of these advanced NDE methods for thru-paint inspections will provide an enabling capability for long-life coating systems and condition based maintenance practices resulting in significant reductions in hazardous waste generation, dramatic cost savings, and enhanced readiness levels for a wide variety of Air Force systems.

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Section: Ultrasonic Imaging Methodsmentioning

confidence: 99%

Advanced imaging of hidden damage under aircraft coatings

Cooney

Blackshire

2006

SPIE Proceedings

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“…Laser-ultrasonics has been in particular tested on a finishing line by IMI/NRC under support of the American Iron and Steel Institute material with the purpose of measuring these properties. Other potential industrial applications of laser-ultrasonics include the detection of degradation of metallic structures, such as fatigue cracking [84], stress corrosion cracking [62] and corrosion thinning in airframes [85]. There is also definite potential for measuring on-line the mechanical properties of a paper web and its tension [86,87].…”

Section: Other Potential Industrial Applicationsmentioning

confidence: 99%

Laser-Ultrasonics: From the Laboratory to Industry

Monchalin¹

2004

AIP Conference Proceedings

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A broad overview of the field of laser-ultrasonics is presented. This overview draws from developments at the Industrial Materials Institute of the National Research Council of Canada as well as elsewhere. The principles of generation and detection are presented, stressing a few key characteristics of laser-ultrasonics: the material is actually the emitting transducer and transduction is made by light, thus eliminating any contact. These features carry both advantages and limitations that are explained. Another feature, which has been an impediment, is actually the complexity of the "laser-ultrasonic transducer", but in spite of this complexity, it can be made very reliable for use in severe industrial environments. It also can be very cost effective for a number of applications. Three applications that are now used in industry are presented: the inspection of polymer matrix composites used in aerospace, the measurement of thin layers in microelectronics and the thickness gauging of hot steel tubing in production. Technological aspects, such as interferometer design, detection lasers and others are also discussed. As an overall conclusion, laser-ultrasonics that was for a long time a laboratory curiosity has definitely now made its transition to industry. Nevertheless, developments should continue to improve performance, to make it well adapted to specific inspection or characterization tasks and more affordable.

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Section: Introductionmentioning

confidence: 99%

Detection of Hidden Corrosion Using Ultrasonic Nondestructive Evaluation

Hrairi¹,

Khamis²

2008

The International Conference on Applied Mechanics and Mechanica

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Hidden corrosion detection is a serious problem in many industries and in the aerospace industry in particular. Initiating on the inside or in the interface of an aircraft's skin, the corrosion must be tested from the outside surface. Ultrasonic bulk waves are often used in thickness detection of plate structures by measuring the time-of-flight. An experimental study of hidden corrosion detection by using ultrasonic non-destructive evaluation (NDE) in the laboratory is presented. Corroded metal as well as corrosion simulation samples were used as specimen for investigation. Normal beam probe was used for testing and qualitative results based on the A-scan oscilloscope display outputs were obtained.

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Laser-ultrasonic detection of hidden corrosion in aircraft lap joints: Results from corroded samples

Cited by 5 publications

References 2 publications

Advanced imaging of hidden damage under aircraft coatings

Advanced imaging of hidden damage under aircraft coatings

Laser-Ultrasonics: From the Laboratory to Industry

Detection of Hidden Corrosion Using Ultrasonic Nondestructive Evaluation

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