Related Papers
NDT & E International
Detecting micro-structure and flaws in composites using eddy-current instrumentation
1997 •
Denis Radecki
Sensors
A Smart Eddy Current Sensor Dedicated to the Nondestructive Evaluation of Carbon Fibers Reinforced Polymers
Bachir Helifa
Infrared Thermography Using Thermal Eddy Current Excitation for Non-Destructive Testing of Multi-Layer Epoxy-Carbon Composites
2017 •
Waldemar Swiderski
The eddy current thermography method is a new technique for the nondestructive detection of cracks in materials based on the conduction of an electric current. It is a combination of eddy current testing and thermography. Eddy currents are used to heat the tested sample, while the defect detection is based on changes in the temperature field profile on its surface, as recorded by a thermographic camera. The article discusses numerical modelling methods supporting the thermographic nondestructive testing of composites and presents example results of the tests.
Eddy Current Non-Destructive Characterization of Carbon Fiber Reinforcement Composites Considering Capacitive Effect
2021 •
Gérard BERTHIAU
Received: 14 December 2020 Accepted: 2 April 2021 This paper presents a modelling procedure to take into account the capacitive effect at high frequencies, in Eddy Current Non-Destructive Characterization (EC-NDC) of Unidirectional Carbon Fiber Reinforcement Composite (UD-CFRC) rods. To simulate the complete EC-NDC systems, first, the multilayer circular air coil is physically modeled by a finite element (FE) axisymmetric eddy current model coupled to equivalent RL circuit. Each layer of the coil is represented by an equivalent resistance (R) in series with the equivalent inductance (L). Secondly, R and L of the coil layers are computed for several frequencies up to 5Mhz, and then introduced into the equivalent RLC circuit with considering inter-turn and interlayer capacitances. Then the inversion problem is solved in order to identify all inner capacitances of the coil. Finally, the UD-CFRC rod is introduced into the FE eddy current axisymmetric model coupled to an equivalent RLC c...
European Physical Journal-applied Physics
The fast computation of eddy current distribution and probe response in hom*ogenized composite material based on semi-analytical approach
2020 •
Denis PREMEL
Motion-induced eddy current testing of composite materials
2016 •
Konstantin Weise
Modern composite materials are gaining more and more importance in mechanical engineering. Due to the complex structure of most of these materials, traditional NDT methods do not satisfy the measurement requirements. In this paper we address the capabilities and limitations of the non-destructive testing method of motion-induced eddy currents for (non-ferromagnetic) composite materials. The specimen moves with constant velocity through a magnetic field, which is created by a fixed permanent magnet. The interaction of induced eddy currents and the primary magnetic field re-sults in the Lorentz force acting on the specimen. Due to the third Newton law, the reaction force acts on the magnet system itself and is measured in all three spatial dimensions. Every force component has a characteristic profile for a certain defect-free specimen. Anomalies in the specimen affect the eddy currents due to variations of local conductivity. These deviations influence the measured force profiles fro...
Non-Destructive Techniques Based on Eddy Current Testing
Jun Cheng
Non-destructive techniques are used widely in the metal industry in order to control the quality of materials. Eddy current testing is one of the most extensively used non-destructive techniques for inspecting electrically conductive materials at very high speeds that does not require any contact between the test piece and the sensor. This paper includes an overview of the fundamentals and main variables of eddy current testing. It also describes the state-of-the-art sensors and modern techniques such as multi-frequency and pulsed systems. Recent advances in complex models towards solving crack-sensor interaction, developments in instrumentation due to advances in electronic devices, and the evolution of data processing suggest that eddy current testing systems will be increasingly used in the future.
IEEE Transactions on Magnetics
An eddy-current model and algorithm for three-dimensional nondestructive evaluation of advanced composites
1988 •
Elias Sabbagh
Composites Science and Technology
Damage detection of C/C composites using ESPI and SQUID techniques
2005 •
Yoshimi Hatsukade
RADIOELECTRONIC AND COMPUTER SYSTEMS
Eddy current tomography for visualization of cracks in aircraft riveted joints
Alexey A Vertiy
The control of the subsurface areas of metal products is necessary in many technological processes. So, for example, in aerospace technology it is essential to determine the presence of defects in aircraft engines. The same problems arise in chemical, power and other industries, which are letting out the highly technological equipment one of the widely known methods for inspecting metal products in the aviation industry is the eddy current method. This method is widely used to control small microscopic defects inside conductive materials. This method allows to ensure the safety of the operation of various products and devices in many areas of modern industry. An eddy current detector (probe) is a device, which induces eddy currents into metal objects and then detects the magnetic fields produced by these eddy currents. A magnetic field is created by a coil, or set of coils, through which a time-varying electrical current is driven. The frequency regime is sufficiently low, a few her...
