A learning-by-examples approach for non-destructive localization and characterization of defects through eddy current measurements

2015 ◽  
Author(s):  
M. Salucci ◽  
G. Oliveri ◽  
F. Viani ◽  
R. Miorelli ◽  
C. Reboud ◽  
...  
Keyword(s):  
Eddy Current ◽  
Non Destructive

Characterization of the Wear in the Turbojet Fins

2015 ◽  
Vol 640 ◽  
pp. 29-34
Author(s):  
Zohra Labed ◽  
Djamel Guechi ◽  
Necib Brahim
Keyword(s):  
Fatigue Damage ◽  
Eddy Current ◽  
Non Destructive ◽  
Non Destructive Techniques

The wear is very difficult to characterize because of its complexity and its measurement phenomenon. Our work is to prepare samples Fan blades, worn, to determine the nature of the wear and damage them. For these reasons, the characterization of these samples was conducted in different microscopic and macroscopic scales. We used non-destructive techniques such as eddy current and penetrant methods. The results obtained allowed us to see the deterioration of fins from one floor to another. These results are directly related to the effects of mechanical, thermal and pressure. It has been, in addition to detecting a different type of damage these fan blades that is the fatigue damage.

Qualification of a Frequency Scanning Eddy Current Equipment for Nondestructive Characterization of New and Serviced High-Temperature Coatings

2001 ◽  
Author(s):  
Giampiero Antonelli ◽  
Paola Crisafulli ◽  
Giacomo Tirone
Keyword(s):  
High Temperature ◽  
Eddy Current ◽  
Gas Turbines ◽  
Structural Damage ◽  
Economic Losses ◽  
Thermal Barriers ◽  
Frequency Scanning ◽  
Non Destructive ◽  
Equipment Qualification

As modern gas turbines are continuously being upgraded, mainly through the increase of their firing temperature and cooling optimization, the prime protection of the high technology and high-cost hot gas path parts is increasingly being transferred to the coatings. In order to avoid the risk of structural damage of these components, with its potential for greater economic losses — mostly traceable to unexpected prime time outages — refurbishment cycle should be dictated by the amount of the life actually expended by the coating. To address the issues of quality and condition assessment of new and serviced high-temperature coatings applied on buckets and vanes, an innovative non-destructive system was developed based on a frequency scanning eddy current technique. It combines outstanding high frequency hardware with model based analysis of raw data. In the paper, quantitative data on equipment qualification are presented, relating to its capability in measuring both the thickness and β-aluminide depletion of MCrAlY coatings applied on Ni-base superalloys. The results of an inspection campaign on serviced blades, performed during major overhauls of ENEL gas turbines, will also be reported, together with recent system upgrades, aiming at extending its applicability to newer coatings such as thermal barriers and over-aluminized MCrAlY’s.

scholarly journals A comparative study of optimization methods for eddy-current characterization of aeronautical metal sheets

2021 ◽  
Vol 34 (4) ◽  
pp. 547-555
Author(s):  
Ben Moussa Oum Salama ◽  
Ayad Ahmed Nour El Islam ◽  
Tarik Bouchala
Keyword(s):  
Eddy Current ◽  
Simplex Method ◽  
Particle Swarm ◽  
Optimization Methods ◽  
304L Stainless Steel ◽  
Swarm Algorithms ◽  
Metal Sheets ◽  
Aeronautical Industry ◽  
Non Destructive

This paper presents eddy current non-destructive characterization of three aeronautical metal sheets by deterministic and stochastic inversion methods. This procedure consists of associating the finite element method with three optimization algorithms (Simplex method and genetic and particle swarm algorithms) simultaneously determine electric conductivity, magnetic permeability and thickness of Al, Ti and 304L stainless steel metal sheets largely used in aeronautical industry. Indeed, the application of these methods has shown the performance of each inversion algorithms. As a result, while doing a qualitative and quantitative comparison, it was found that the Simplex method is more advantageous in comparison with genetic and particle swarm algorithms, since it is faster and more stable .

Characterization of aging behaviour in M250 grade maraging steel using eddy current non-destructive methodology

2007 ◽  
Vol 464 (1-2) ◽  
pp. 233-240 ◽  
Author(s):  
K.V. Rajkumar ◽  
B.P.C. Rao ◽  
B. Sasi ◽  
Anish Kumar ◽  
T. Jayakumar ◽  
...  
Keyword(s):  
Maraging Steel ◽  
Eddy Current ◽  
Non Destructive

Non-Destructive Characterization of Nickel-Base Hardface Deposit on Austenitic Stainless Steel Through Eddy Current and Magnetic Barkhausen Techniques

2012 ◽  
Vol 56 (11-12) ◽  
pp. 59-65 ◽  
Author(s):  
Gopa Chakraborty ◽  
Adurthi Viswanath ◽  
Chandan Kumar Mukhopadhyay ◽  
Velayutham Ramasubbu ◽  
Shaju Kattukaram Albert ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Eddy Current ◽  
Nickel Base ◽  
Non Destructive ◽  
Non Destructive Characterization

scholarly journals The fast computation of eddy current distribution and probe response in homogenized composite material based on semi-analytical approach

2020 ◽  
Vol 89 (1) ◽  
pp. 10901
Author(s):  
Houssem Chebbi ◽  
Denis Prémel
Keyword(s):  
Eddy Current ◽  
Simulated Data ◽  
Multilayered Structure ◽  
Static Field ◽  
Fast Computation ◽  
Destructive Testing ◽  
Modal Approach ◽  
High Anisotropy ◽  
Non Destructive

Due to the excessive use of composites in the industrial field, many numerical modeling approaches dedicated to the characterization of such complex material by means of Non Destructive Testing Techniques were developed. In this paper, we present a numerical model dedicated to simulate the inspection of unidirectional Carbon Fiber Reinforced Polymer using Eddy Current technique for detecting fiber disorientation. A semi-analytical model based on a modal approach is developed for the fast computation of quasi-static field induced by an arbitrary 3D Eddy Current probe in the material. Because of the high anisotropy and strong heterogeneity of such material, a prior phase of homogenization is assumed and the material is then considered as homogeneously anisotropic. The modal approach consists in resolving Maxwell’s equations in the Fourier domain. Therefore, the electromagnetic field is expressed as a sum of eigen-modes. To take into account the wave propagation through the multilayered structure and boundary conditions at each separating interface, a stable and recursive scattering matrix algorithm has been implemented. The impedance of the probe is computed analytically using Auld’s formula in orders to identify the main orientation of the fibers in the inspected zone. For numerical validation, simulated data provided by the model are compared to finite element data.

Simulation and Numerical Analysis of Nondestructive Testing on Weld Cracks by Eddy Current Thermography

2014 ◽  
Vol 1061-1062 ◽  
pp. 874-880
Author(s):  
Lei Jiang ◽  
Zhi Ping Liu ◽  
Xing Le Liu ◽  
Ge Lu
Keyword(s):  
Eddy Current ◽  
Excitation Frequency ◽  
Reference Value ◽  
Inspection System ◽  
Surface Cracks ◽  
Large Area ◽  
Element Analysis ◽  
Testing Method ◽  
Non Destructive

Eddy current thermography is an emerging non-destructive method for detection and characterization of surface cracks in conductive specimen over a relatively large area. In this paper, the weld crack testing method based on eddy current thermography was proved to be feasible through studying the influence of inductor orientation, excitation frequency and crack length, depth, width on the surface temperature distribution using finite element analysis software COMSOL Multiphysics4.3b. The findings show that the quantitative evaluation is more viable according to the optimized parameters. This method has a certain reference value for quantitative analysis and designing inspection system with eddy current stimulated approach.

Metallurgical Characterization of Duplex Steel by Non Destructive Techniques

2010 ◽  
Vol 442 ◽  
pp. 330-334
Author(s):  
S.H. Khan ◽  
Aamer Nusair Khan ◽  
K. Mahmood
Keyword(s):  
Ultrasonic Velocity ◽  
Eddy Current ◽  
Cold Working ◽  
Longitudinal Velocity ◽  
X Ray ◽  
Duplex Steel ◽  
Cold Rolled ◽  
Metallurgical Characterization ◽  
Non Destructive

This paper describes the application of eddy current and ultrasonic velocity technique for the study of cold rolled duplex steel. Samples are cold rolled up to 80 percent and then tested for X-Ray diffractrometeric analysis, hardness testing, ultrasonic longitudinal velocity and for eddy-current testing. It was observed that eddy current impedance and longitudinal velocity is affected due to variation in micro-structure induced by cold working. It is suggested that eddy current and ultrasonic velocity techniques are useful tools for the characterization of duplex steel during cold working operation.

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