EXAMINATION OF ROUGH SURFACES WITH EDDY CURRENT METHOD

2010 ◽  
Vol 158 (4) ◽  
pp. 84-99
Author(s):  
Leszek DZICZKOWSKI ◽  
Andrzej BUCHACZ
Keyword(s):  
Eddy Current ◽  
Surface Condition ◽  
Current Method ◽  
Material Surface ◽  
Geometrical Parameters ◽  
Test Results ◽  
Eddy Current Method ◽  
Substantial Impact ◽  
The Relationship ◽  
Non Destructive

As the relationship between some important parameters of materials and their electric conductivity really exists, it makes it possible to use the eddy current method to measure conductivity of material in a non-destructive manner and then infer about the desired properties of materials, their continuous or non-continuous structure or some geometrical parameters. However, the substantial impact of surface condition demonstrated by examined materials onto test results is a significant drawback of the eddy current method. This is why, a new and innovative method for compensation of material surface roughness onto results of conductance measurements is proposed. The presented method is based on the double calibration process applied to the measuring kit of the conductometer and the measuring probe.

scholarly journals Evaluation of Loose Assemblies Using a Multi-frequency Eddy Current Method and Artificial Neural Networks 

2021 ◽  
Vol 31 (3) ◽  
pp. 78-82
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Eddy Current ◽  
Current Method ◽  
Eddy Current Method ◽  
The Neural Network ◽  
Artificial Neural ◽  
Aluminum Plates ◽  
The Relationship ◽  
Non Destructive

The paper deals with the non-destructive evaluation of the airgap existing between parts in loose metallic assemblies, using the eddy current (EC) method. In this study, the relationship between the variations of the impedance of a ferrite-cored coil sensor and an assembly featuring two aluminum plates is analyzed. Then artificial neural networks, based on statistical learning of the relationship between a sensor and an assembly are proposed and developed using both simulated and measured multi-frequency EC data, so as to estimate the distance between the assembly parts in a range from 0 µm to 500 µm. For the neural network built on experiment data, the inaccuracy of obtained results is smaller than 1.06%.

scholarly journals Numerical Simulation of Non-Destructive Remote Field Eddy Current Testing of Rolled Metal Tubes

2019 ◽  
pp. 46-55
Author(s):  
A.G. Efimov ◽  
N.R. Kuzelev ◽  
E.V. Martyanov ◽  
B.M. Kanter ◽  
A.E. Shubochkin
Keyword(s):  
Numerical Simulation ◽  
Eddy Current ◽  
Current Method ◽  
Eddy Current Testing ◽  
Eddy Current Method ◽  
Current Testing ◽  
Advantages And Disadvantages ◽  
Current Transducer ◽  
Non Destructive ◽  
Eddy Current Transducer

The first publications describing the physical principles of the non-destructive remote field eddy current testing method appeared about 30 years ago. This method allows to significantly expand the field of application of eddy current testing. However, due to the lack of a theoretical justification, this method did not get widespread use around the world. Domestic publications in this area are completely absent, and the descriptions given in few foreign publications often contradict each other. There are no results of full-scale simulation using numerical methods in available domestic and foreign sources. The distinctive feature of this method under consideration is the ability of detecting defects on the external (with respect to the eddy current transducer) side of the tested object, which is impossible for the classical eddy current method due to the limited eddy current penetration depth. The basics of the method were considered, the distinctive features were presented, and the advantages and disadvantages of remote field eddy current testing of metals were pointed out. A numerical simulation with the subsequent analysis of the obtained results has been carried out, the transducer design for remote field eddy current testing is given. The influence of various factors on the change in the added voltage of the signal coil of the eddy current transducer in the presence of a defect in the external wall of the tube was considered. Expressions that determine the optimal ratio of the diameters of the transducer and the tested product were obtained. The values of the test parameters and the limiting wall thickness of the tested ferromagnetic product were determined.

scholarly journals Non–Destructive Testing of Conductive Material by Eddy Current Air Probe Based on Swept Frequency

2015 ◽  
Vol 66 (3) ◽  
pp. 174-177 ◽  
Author(s):  
Andrea Štubendeková ◽  
Ladislav Janoušek
Keyword(s):  
Numerical Model ◽  
Eddy Current ◽  
Current Method ◽  
Wide Frequency Range ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Eddy Current Method ◽  
Exciting Coil ◽  
Non Destructive ◽  
2D Numerical Model

Abstract This article deals with non-destructive testing of conductive materials by eddy current method based on swept frequency. A 2D numerical model of eddy current air-core probe was created in the LTspice software at first. The probe consists of two coils: exciting coil and receiving. The probe is positioned in air in this case. Experimental and calculated frequency responses of the probe are obtained within a wide frequency range using swept frequency in order to validate the model. Frther a 3D model used for non-destructive testing of austenitic steel plate with three electro-discharge machined notches is then developed accordingly. Results of measurement are compared with 3D numerical model using COMSOL Multiphysics software.

Hardness assessment of induction hardened layers based on the analysis of eddy current signal

2020 ◽  
Vol 24 (4) ◽  
pp. 3-9
Author(s):  
Dominik Kukla ◽  
Mirosław Wyszkowski
Keyword(s):  
Comparative Analysis ◽  
Cross Sections ◽  
Eddy Current ◽  
Eddy Currents ◽  
Induction Hardening ◽  
Current Method ◽  
Current Signal ◽  
Eddy Current Method ◽  
Lift Off ◽  
Non Destructive

The work concerns the assessment of the possibility of identifying changes in hardness of carburized and induction hardened layers using the eddy current method. The tests were carried out on three sets of samples, made of AMS 6414 steel, with different layer thickness, subjected to induction hardening and tempering in a wide temperature range, to obtain differences in layer hardness for each set. The samples of each set, with the layers with a hardness in the range of 760–920 HV, were subject to testes using eddy currents which consisted in the assessment of phase angle changes obtained as a result of the lift – off effect. Standard hardness measurements on the surfaces of the hardened layers were also carried out, and microhardness profiles were made on the cross-sections of the samples. The results of hardness measurements were subject to comparative analysis with the results of non-destructive tests and on this basis it was possible to identify changes in the hardness of layers, based on the results of non-destructive tests.

scholarly journals Assessment of the Properties of AISI 410 Martensitic Stainless Steel by an Eddy Current Method

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1290 ◽  
Author(s):  
Huayu Zhang ◽  
Zhiheng Wei ◽  
Fengqin Xie ◽  
Baohai Sun
Keyword(s):  
Stainless Steel ◽  
Thermal Treatment ◽  
Nondestructive Testing ◽  
Eddy Current ◽  
Martensitic Stainless Steel ◽  
Surface Hardness ◽  
Current Method ◽  
Eddy Current Method ◽  
Current Output ◽  
The Relationship

Based on electromagnetic theory, metallurgical characteristics can be detected by eddy current nondestructive testing technology. In this study, the relationship between the surface microstructure and the eddy current output of martensitic stainless steel AISI 410 was studied using this technology at different quenching temperatures. The mechanical properties include material hardness, microstructure types and microstructural changes after thermal treatment was evaluated. Using Vickers hardness as the surface hardness index of AISI 410 steel, the relationship between eddy current output signal, in terms of impedance and inductance, and sample surface hardness was studied and the effects of different quenching temperatures on the steel’s surface hardness was examined. In addition, the change of microstructure types of AISI 410 steel after thermal treatment was detected by the eddy current nondestructive testing method, and the results were verified by metallographic microscopy.

scholarly journals Use of non-destructive eddy current technique to detect simulated corrosion of aircraft structures

2020 ◽  
Vol 64 (2) ◽  
pp. 52-58
Author(s):  
M. Janovec ◽  
J. Čerňan ◽  
F. Škultéty
Keyword(s):  
Eddy Current ◽  
Current Method ◽  
Experimental Sample ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Eddy Current Method ◽  
Aircraft Structures ◽  
Aluminum Sheets ◽  
Riveted Joints ◽  
Non Destructive

AbstractThe article deals with the issue of non-destructive testing of riveted joints. In the article, the authors used a non-destructive eddy current array technique, which was applied to detect simulated corrosion in the field of aircraft riveted joints of aluminum sheets. In aircraft maintenance, the eddy current method is used to control the outer surface of the aircraft skin, especially the areas around the riveted joints. This method makes it possible to detect hidden cracks and corrosion that may occur during aircraft operation. Especially hidden are hidden cracks and corrosion of aircraft structures, which cannot be detected during a visual inspection of the aircraft. The aim of the experimental measurements was to reveal simulated corrosion in the area of riveted joints formed on the experimental sample. Corrosion was simulated by gluing aluminum powder to the surface of the aluminum sheets from which the sample was made. The simulated corrosion in the second and third layers of the riveted sample was reliably detected. The settings, the method of control and the results of measurements are given in the article in the experimental part and the results of measurements. Measurements were performed using a defectoscope with an ECA measurement module, with appropriate measuring probes suitable for this type of inspection.

scholarly journals Non-destructive testing of Al-Mg alloys by using the eddy-current method

2017 ◽  
Vol 106 ◽  
pp. 03007 ◽  
Author(s):  
Sergey Dmitriev ◽  
Alexey Ishkov ◽  
Alexander Katasonov ◽  
Vladimir Malikov ◽  
Anatoly Sagalakov
Keyword(s):  
Eddy Current ◽  
Current Method ◽  
Mg Alloys ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Eddy Current Method ◽  
Non Destructive ◽  
Al Mg Alloys
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