Inspection of composite structures using line scanning thermography

Ley, Obdulia; Butera, M.; Godinez, Valery

doi:10.1117/12.919176

Cited by 8 publications

(6 citation statements)

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“…Finally, line scanning thermography is a NASA patented technique that uses an IR sensor moving in synchronous with the heat source to dynamically investigate metallic or composite surfaces. It has been tested for impact damages on CFRP panels [190] and to assess manufacturing defects in GFRP blades [191].…”

Section: Active Irtmentioning

confidence: 99%

Non-Destructive Techniques for the Condition and Structural Health Monitoring of Wind Turbines: A Literature Review of the Last 20 Years

Civera

Surace

2022

Sensors

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A complete surveillance strategy for wind turbines requires both the condition monitoring (CM) of their mechanical components and the structural health monitoring (SHM) of their load-bearing structural elements (foundations, tower, and blades). Therefore, it spans both the civil and mechanical engineering fields. Several traditional and advanced non-destructive techniques (NDTs) have been proposed for both areas of application throughout the last years. These include visual inspection (VI), acoustic emissions (AEs), ultrasonic testing (UT), infrared thermography (IRT), radiographic testing (RT), electromagnetic testing (ET), oil monitoring, and many other methods. These NDTs can be performed by human personnel, robots, or unmanned aerial vehicles (UAVs); they can also be applied both for isolated wind turbines or systematically for whole onshore or offshore wind farms. These non-destructive approaches have been extensively reviewed here; more than 300 scientific articles, technical reports, and other documents are included in this review, encompassing all the main aspects of these survey strategies. Particular attention was dedicated to the latest developments in the last two decades (2000–2021). Highly influential research works, which received major attention from the scientific community, are highlighted and commented upon. Furthermore, for each strategy, a selection of relevant applications is reported by way of example, including newer and less developed strategies as well.

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Section: Active Irtmentioning

confidence: 99%

Non-Destructive Techniques for the Condition and Structural Health Monitoring of Wind Turbines: A Literature Review of the Last 20 Years

Civera

Surace

2022

Sensors

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“…In LST, the temperature field T ( r,z,t ) after the laser spot is switched off is analytically obtained by convoluting a Gaussian shape round spot source (i.e., the laser pulse) with continuous heating. This is expressed as follows [ 54 , 89 ]:

where ( r,z ) are cylindrical coordinates with the origin on the surface at the centre of the irradiated spot, with

, I max and a are the maximum power density of the laser pulse and the radius of the laser beam, respectively, and p ( t ) is the normalised temporal profile of the laser pulse at the time t . The temperature response T ( r, 0 ,t ) measured at the surface is obtained by posing z = 0 in Equation (11).…”

Section: Optically Stimulated Thermographymentioning

confidence: 99%

Recent Advances in Active Infrared Thermography for Non-Destructive Testing of Aerospace Components

Ciampa

Mahmoodi

Pinto

et al. 2018

Sensors

366

185

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Active infrared thermography is a fast and accurate non-destructive evaluation technique that is of particular relevance to the aerospace industry for the inspection of aircraft and helicopters’ primary and secondary structures, aero-engine parts, spacecraft components and its subsystems. This review provides an exhaustive summary of most recent active thermographic methods used for aerospace applications according to their physical principle and thermal excitation sources. Besides traditional optically stimulated thermography, which uses external optical radiation such as flashes, heaters and laser systems, novel hybrid thermographic techniques are also investigated. These include ultrasonic stimulated thermography, which uses ultrasonic waves and the local damage resonance effect to enhance the reliability and sensitivity to micro-cracks, eddy current stimulated thermography, which uses cost-effective eddy current excitation to generate induction heating, and microwave thermography, which uses electromagnetic radiation at the microwave frequency bands to provide rapid detection of cracks and delamination. All these techniques are here analysed and numerous examples are provided for different damage scenarios and aerospace components in order to identify the strength and limitations of each thermographic technique. Moreover, alternative strategies to current external thermal excitation sources, here named as material-based thermography methods, are examined in this paper. These novel thermographic techniques rely on thermoresistive internal heating and offer a fast, low power, accurate and reliable assessment of damage in aerospace composites.

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“…It was reported that the use of frequency domain (phase) method led to improvement in resolution and high sensitivity for damage detection. Sub-surface artificial defects in composite sandwich panels (commonly used materials in aircraft applications) could be identified using Laser-Line Thermography (LLT) [43][44]. Feasibility of Laser-Spot Thermography (LST), Laser-Line Thermography (LLT) and Ultrasonic Stimulated Thermography (UST) for inspections of composite materials, employed in aircraft industry, such as metallic turbine blades, aluminium samples, CFRP composites etc., to name few, was also assessed in several investigations [45][46][47][48][49].…”

Section: Applications Of Thermography For Aircraft Compositesmentioning

confidence: 99%

Diagnosis of Composite Materials in Aircraft Applications–Brief Survey of Recent Literature

Alhammad¹,

Fragonara²,

Avdelidis³

2020

Preprint

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Diagnosis and prognosis of failures for aircrafts’ integrity are some of the most important regular functionalities in complex and safety-critical aircraft structures. Further, development of failure diagnostic tools such as Non-Destructive Testing (NDT) techniques, in particular, for aircraft composite materials, has been seen as a subject of intensive research over the last decades. The need for diagnostic and prognostic tools for composite materials in aircraft applications rises and draws increasing attention. Yet, there is still an ongoing need for developing new failure diagnostic tools to respond to the rapid industrial development and complex machine design. Such tools will ease the early detection and isolation of developing defects and the prediction of damages propagation; thus allowing for early implementation of preventive maintenance and serve as a countermeasure to the potential of catastrophic failure. In this paper, following a short introductory summary and definitions, this paper provides a brief literature review of recent research on failure diagnosis of composite materials with an emphasis on the use of NDT techniques in aerospace industry. In addition to this, within a some of significant NDT application extents, prognosis of composites is also briefly discussed.

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Inspection of composite structures using line scanning thermography

Cited by 8 publications

References 0 publications

Non-Destructive Techniques for the Condition and Structural Health Monitoring of Wind Turbines: A Literature Review of the Last 20 Years

Non-Destructive Techniques for the Condition and Structural Health Monitoring of Wind Turbines: A Literature Review of the Last 20 Years

Recent Advances in Active Infrared Thermography for Non-Destructive Testing of Aerospace Components

Diagnosis of Composite Materials in Aircraft Applications–Brief Survey of Recent Literature

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