Mechanisms and Models for Crack Detection With Induction Thermography

Vrana, Johannes; Goldammer, Matthias; Baumann, J.; Rothenfusser, M.; Arnold, W.

doi:10.1063/1.2902698

Cited by 90 publications

(63 citation statements)

References 5 publications

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“…10.21611/qirt.2016.165 The coil positioning and orientation has been demonstrated as a critical parameter for crack detectability. A change in the coil positioning, as increasing the distance of the coil from the part, results in a decrease of the current density [6], which can finally be insufficient for generating the temperature difference for the crack detection.…”

Section: Longitudinal Crack Ml1 Ml2 Ml3 Ml4 (External Coil)mentioning

confidence: 99%

“…The most critical characteristic for crack detection in the study will be the sensitivity (NETD) [6], due to the fact that the temperature differences that Eddy currents induce in the crack are minimal. The pitch size is also an important parameter, since the crack width will be not detected with an insufficient spatial resolution.…”

Section: Thermal Camerasmentioning

confidence: 99%

“…The ability to detect defects in materials by induction thermography is defined by the called characteristic (defined by the electrical conductivity σ and the magnetic permeability ) for the material [4], [5], [6]. The frequency of the Eddy currents is a determining factor since The induced Eddy currents exponentially decay below the surface; they (skin effect) for medium and high frequencies.…”

Section: Fig 2: Eddy Currents Suitable Parameters For Crack Detectiomentioning

confidence: 99%

See 2 more Smart Citations

Induction thermography for automatic crack detection in automotive components

Franco¹,

Rodríguez²,

Otero³

2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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Active thermography with inductive excitation is proposed as a reliable method for substitution of magnetic particle inspection on steel automotive components. A study for inner part inspection of the component is presented, where typical superficial cracks of different length (>5 mm) and orientation are detected by induction thermography. Programmed acquisition and analysis with Fourier transformation are developed to obtain a phase image for crack detection. Image processing can be developed for a reliable detection of the crack within the geometrical indications. Short induction and testing times per view will allow acceptable inspection times for the complete steel parts.

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Section: Longitudinal Crack Ml1 Ml2 Ml3 Ml4 (External Coil)mentioning

confidence: 99%

Section: Thermal Camerasmentioning

confidence: 99%

Section: Fig 2: Eddy Currents Suitable Parameters For Crack Detectiomentioning

confidence: 99%

See 1 more Smart Citation

Induction thermography for automatic crack detection in automotive components

Franco¹,

Rodríguez²,

Otero³

2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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“…в існу-ючих методах електромагнітного активного термографічного контролю [2,3] використову-ються ефекти зміни теплофізичних та електро-фізичних характеристик внаслідок порушення суцільності матеріалу. Частота електромагніт-ного поля виступає параметром, що задає гли-бину зондування.…”

unclassified

Application Of Electromagnetic Activation In Thermographic Control Of Defects And Structural Inhomogeneities In Ferromagnetic Materials

Bazaleev¹,

RadiationTechnologies²,

Bryukhovetskii³

et al. 2016

Tekh. Diagnost. i Nerazrush. Kontrol

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“…Different types of RCF cracks have been known to occur in rails such as: rail gauge corner cracking, shelling, transverse rail defects and squats [6]. 10.21611/qirt.2016.138…”

Section: Introductionmentioning

confidence: 99%

Eddy Current Thermography for Rail Inspection

Vaibhav¹,

Balasubramaniam²,

Thomas³

et al. 2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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With the tendency of the railway transportation into heavy haul, more frequent usage of rail tracks and increased axle load, the problem of surface damage and fatigue is dominant on rails. Rolling contact fatigue (RCF), which leads to crack formation in rail track heads, is becoming a growing concern in the transportation industry. It occurs on or very close to the rail head surface, and is a significant cause of rail failure. The detection of cracks in RAILS is a critical requirement in the Railway industry. Cracks, if undetected will lead to rail fractures and consequently may lead to catastrophic accidents. Thus with the development and operation of high speed trains, condition based maintenance and monitoring becomes an important approach for the improvement of reliability and safety of rail transportation. Eddy Current Thermography (ECT) is an emerging NDT method especially for conductive material like rails which combines the advantages of eddy current testing and IR Thermography. Due to electrical conductivity, thermal conductivity and high permeability of rails, ECT is very suitable for its damage detections. This technology describes an inspection methodology which utilizes scanning induction Thermography in which coil is excited by a high frequency alternating current and induced eddy current are generated in sample placed near the coil. The thermographic camera is arranged to capture data indicative of a thermal response resulting from the flow of electrical current through the copper coil which scans the rail track. A computer system is configured to process the data from the thermographic camera to generate an indication of a presence of a discontinuity in the rails.

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Mechanisms and Models for Crack Detection With Induction Thermography

Cited by 90 publications

References 5 publications

Induction thermography for automatic crack detection in automotive components

Induction thermography for automatic crack detection in automotive components

Application Of Electromagnetic Activation In Thermographic Control Of Defects And Structural Inhomogeneities In Ferromagnetic Materials

Eddy Current Thermography for Rail Inspection

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