DC-Biased Magnetization Based Eddy Current Thermography for Subsurface Defect Detection

Wu, Jianbo; Zhu, Junzhen; Xia, Hui; Liu, Chengyong; Huang, Xiaoming; Tian, Gui Yun

doi:10.1109/tii.2019.2891107

Cited by 59 publications

(8 citation statements)

References 39 publications

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“…Junzhen Zhu (S' 19) is currently working toward the Ph.D. degree at School of Engineering, Newcastle University, U.K.…”

Section: Jianbo Wu (M'19) Is Currently Anmentioning

confidence: 99%

“…As a promising candidate, eddy current pulsed thermography (ECPT), also known as induction thermography and electromagnetic thermography, exploits electromagnetic excitation and thermal diffusion. These enable ECPT to easily heat the clustered defects and characterize their geometric parameters [17]- [19]. For quantifying angular defects using the ECPT technique, Abidin et al [20] extracted the inclination of the line scan from the transient thermal distribution and the maximum temperature to quantify the slot angle and pocket length, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Rolling Contact Fatigue Cracks in Rails by Eddy Current Pulsed Thermography

Zhu

Withers

et al. 2021

IEEE Trans. Ind. Inf.

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Locating and characterizing rolling contact fatigue (RCF) cracks in rails is gaining attention in the railway industry. Eddy current pulsed thermography (ECPT) can detect such cracks by combining the benefits of electromagnetic excitation and thermal diffusion. To date, most studies focus on investigating specific features based on artificial defects and verification on real cracks is lacking. To establish the best means of characterizing cracks of different inclination angles, eight spatial and temporal ECPT features are evaluated on idealized and real RCF cracks. Results show that longer time slots and pulse durations make the relations clearer. For evaluation of real RCF cracks, the area-based and the kurtosis-based features are the most suitable and robust measures for characterizing inclination angles.

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“…Junzhen Zhu (S' 19) is currently working toward the Ph.D. degree at School of Engineering, Newcastle University, U.K.…”

Section: Jianbo Wu (M'19) Is Currently Anmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of Rolling Contact Fatigue Cracks in Rails by Eddy Current Pulsed Thermography

Zhu

Withers

et al. 2021

IEEE Trans. Ind. Inf.

Self Cite

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“…However, in case of fast inspection where we use the early thermal response, the detectable depth range of ferromagnetic materials is generally very small due to their high permeability, significantly limiting the internal damage detecting capability of Eddy current thermography. Wu, J., et al recently proposed a DC-biased magnetization-based Eddy current thermography (DCMECT) in order to increase the penetration depth for the inspection of ferromagnetic materials [63]. To increase the thermal contrast between the intact and damaged region inside the material, DCMECT adjusts the permeability of material by exploiting the nonlinear magnetic permeability of ferromagnetic materials.…”

Section: 23) Advanced Ir Thermographymentioning

confidence: 99%

Damage detection of composite materials via electrical resistance measurement and IR thermography: A review

Ryu¹

2021

Preprint

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Composite materials, composed of multiple constituent materials with dissimilar properties, are actively adopted in a wide range of industrial sectors due to their remarkable strength-to-weight and stiffness-to-weight ratio. Nevertheless, the failure mechanism of composite materials is highly complicated due to their sophisticated microstructure, making it much harder to predict their residual material lives in real life applications. A promising solution for this safety issue is structural damage detection. In the present paper, damage detection of composite material via electrical resistance-based technique and infrared thermography is reviewed. The operating principles of the two damage detection methodologies are introduced, and some research advances of each techniques are covered. The development of IR thermography-based NDT including optical thermography, laser thermography and eddy current thermography will be reported, as well as the electrical impedance tomography (EIT) which is a technology increasingly drawing attentions in the field of electrical resistance-based damage detection. A brief comparison of the two methodologies based on each of their strengths and limitations is carried out, and a recent research update regarding the coupling of the two techniques for improved damage detection in composite materials will be discussed.

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“…For surface and near-surface defects, conventional eddy current or low-frequency eddy current testing technology can be utilized. For example, Wu [ 8 , 9 ] proposed a DC-biased magnetization based ECT (DCMECT) technique which can detect the subsurface defect with a buried depth up to 6 mm. While for deep buried crack-like defects, even low-frequency eddy current testing technology is difficult to effectively detect defects.…”

Section: Introductionmentioning

confidence: 99%

Study on Remote Field Eddy Current Testing Technology for Crack-like Defects in Long Truss Structure of Aircraft

Zhang

Deng

Ning³

et al. 2022

Materials

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Detection of hidden defects of aircraft long truss structures (aluminum alloy) is a challenging problem. The shape of the aircraft truss structure is complex, and the crack defects are buried in a large depth. Without the restriction of skin effect, remote field eddy current (RFEC) has great advantages in detecting buried depth defects. In this paper, in order to detect the hidden defects of the aluminum alloy aircraft long truss structure, the remote field eddy current probe is improved from two aspects of magnetic field enhancement and near-field signal suppression using the finite element method. The results show that indirect coupling energy is greatly enhanced when the connected magnetic circuit is added to the excitation coil. By adding a composite shielding structure outside the excitation coil and the detection coil, respectively, the direct coupling energy is effectively restrained. As a result, the size of the probe is reduced. By optimizing the coil spacing and probe placement position, the detection sensitivity of the probe is improved. The simulation is verified by experiments, and the experimental results are consistent with the simulation conclusions.

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DC-Biased Magnetization Based Eddy Current Thermography for Subsurface Defect Detection

Cited by 59 publications

References 39 publications

Characterization of Rolling Contact Fatigue Cracks in Rails by Eddy Current Pulsed Thermography

Characterization of Rolling Contact Fatigue Cracks in Rails by Eddy Current Pulsed Thermography

Damage detection of composite materials via electrical resistance measurement and IR thermography: A review

Study on Remote Field Eddy Current Testing Technology for Crack-like Defects in Long Truss Structure of Aircraft

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