A network mesh method to calculate eddy currents on conducting surfaces

Weissenburger, D.W.; Christensen, U.

doi:10.1109/tmag.1982.1061879

Cited by 31 publications

(8 citation statements)

References 1 publication

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“…In our FEM code, boundary conditions were set as follows: magnetic insulation (n × A = 0 derived from B · n = 0), for fictitious subdomain (representation of an infinite volume) [20] whereas the continuity for the CFRP specimen is insured by n × (H 1 − H 2 ) = 0 [20]. Our simulations have been based on a discrete domain [21] having 17287 elements. Mesh has been generated with tetrahedral elements (size of 0.05 mm) for the CFRP plate, the exciting coil and its ferrite core.…”

Section: Fem Approachmentioning

confidence: 99%

Ec Modelling and Enhancement Signals in CFRP Inspection

Megali¹,

Pellicanó²,

Cacciola³

et al. 2010

PIER M

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Abstract-Non Destructive Testing techniques are more and more exploited in order to quickly and cheaply recognize flaws into the inspected materials, specially for carbon fiber reinforced polymers in recent years. Their production which are widely used both in civil and military applications, is an elaborate process un-free from faults and problems. Problems during the manufacturing, such as plies' overlapping, can cause flaws in the resulting material, this way compromising its integrity. Within this framework, this work aims to propose a design of ferrite core probe for eddy current non destructive evaluation, in order to investigate the presence of defects in carbon fiber epoxy composite materials. In this context, modelling is a powerful tool for inspection improvements. It helps probe-coil designers to optimize sensors for each examination requirement, providing better understanding of the involved physics, supporting operator training and increasing defect analysis reliability. Particularly, Finite Element based analyzes will be carried out into this path. After this step, in order to improve the quality of simulated measurement, a filtering technique has been exploited in order to improve the accuracy and performance of the flaw detection.

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Section: Fem Approachmentioning

confidence: 99%

Ec Modelling and Enhancement Signals in CFRP Inspection

Megali¹,

Pellicanó²,

Cacciola³

et al. 2010

PIER M

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“…For our aim, it is necessary to impose the boundary conditions as follows. Magnetic field (n × H = n × H 0 ) for boundary of air where acting the rotating magnetic field; for remaining boundaries, included the defect, the continuity is assured by the expression n × (H 1 − H 2 ) = 0 [10,11]. The rotation effect of the magnetic field vector has been simulated by applying a uniform B vector, timely rotated according to the following Euler rotation formulation [12]:…”

Section: The Fea Approachmentioning

confidence: 99%

Rotating Electromagnetic Field for Crack Detection in Railway Tracks

Cacciola¹,

Megali²,

Pellicanó³

et al. 2010

PIERS Online

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The main problem about a railway analysis is detection of cracks in the structure.If these deficiencies are not controlled at early stages they might cause huge economical problems affecting the rail network (unexpected requisition of spare parts, handling of incident and/or accidents). Within this framework, the early and continuous use of Non Destructive Tests can be useful. In this context, Eddy Current Testing is increasing in importance and popularity. Particularly, in this paper we exploit the measure of normal component, with respect to the scanned surface, of magnetic field. Whilst the scientific literature proposes a lot of solutions for detecting sub-superficial defects, an open problem is related to the geometrical complexity of the structure and the relevant difficulty of crack detection. In this paper, we propose a Finite Element Method based approach for modelling a fast and accurate evaluation of the defect in railways tracks. The modelled system is strongly versatile and the choice of electrical parameters affect the design of new probes for this kind of inspection. In particular, we propose a solution exploiting a rotating electromagnetic field with very encouraging results: The proposed model is able to recognize deep and surface cracks even if their orientations is vertical to the longitudinal direction of the sensor.

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“…For our aim, it is necessary to impose the boundary conditions as follows. Magnetic field (n × H = n × H 0 ) for boundary of air where acting the RMF; for remaining boundaries, included the defect, the continuity is assured by the expression n × (H 1 − H 2 ) = 0 [11,12]. The rotation effect of the magnetic field vector has been simulated by applying a uniform B vector, timely rotated according to the following Euler rotation formulation [15]:…”

Section: Principle Of Rmf and Fea Approachmentioning

confidence: 99%

Rotating Electromagnetic Field for NDT Inspections

Cacciola

Pellicanó²,

Megali³

et al. 2010

PIER B

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Abstract-Reliable performance of a component or structure depends on its pre-service quality and in-service degradation under operating conditions.The importance of Non-Destructive Testing and Evaluation is ever increasing, above all in ensuring pre-service quality and monitoring in-service degradation, in order to avoid premature failure of the components/structures. There are many Non-Destructive Techniques based on various physical principles. In this work, our main objective is the characterization of anomalies such as defects, stresses and microstructural degradations in materials. Particularly, in this work we propose a Finite Element Method based approach for modelling a fast and accurate evaluation of defects in metallic materials able to easily detect defects, aside from the orientation. Within this framework, the paper proposes the application of a magnetic field rotating perpendicularly to the analysed specimen. We discuss a few case studies, starting from numerical simulations and finally highlighting the importance of this approach in order to evaluate the structural integrity assessment.

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A network mesh method to calculate eddy currents on conducting surfaces

Cited by 31 publications

References 1 publication

Ec Modelling and Enhancement Signals in CFRP Inspection

Ec Modelling and Enhancement Signals in CFRP Inspection

Rotating Electromagnetic Field for Crack Detection in Railway Tracks

Rotating Electromagnetic Field for NDT Inspections

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