Abstract
Non-destructive evaluation techniques that are based on electromagnetic methods are commonly used for inspection of metallic and carbon fibre reinforced plastics parts. Some of these inspection methods are based on eddycurrents which are generated by the electromagnetic induction phenomenon occurring under variable magnetic induction field. In eddy-currents testing, the depth of penetration into the material is controlled by the conductivity of the tested material and also the work frequency. Transient eddy-currents, also called pulsed eddy-currents, is an emerging non destructive technique that employs a pulsed excitation to induce a transient electromagnetic response from defects lying deep within a conducting structure. Such defects are difficult to inspect by conventional techniques, such as harmonic eddy-currents or ultrasonics. A large number of recent scientific publications have dealt with the theoretical understanding of the pulsed eddy-currents phenomenon and have also undertaken the design feature of appropriate probes. Finite element solution of the governing equations has been used to simulate the output signals as function of the input electrical excitation signal. Considering a B-scan strategy, simulation of a pulsed eddy-currents based probe is performed in this work with the objective to assess detectability of small defects through monitoring impedance changes of a detection probe.
Highlights
Composites made from Carbon Fiber Reinforced Plastics (CFRP) have superior material properties in comparison with metallic components, such as: light weight, robustness, damage tolerance, fatigue strength and corrosion resistance
A defect having the form of an open parallelepiped cavity that has sides parallel to those of the plate is assumed to be present at the centre of the plate
A transmitter/receiver probe has been proposed to perform detection of defects appearing in composites parts made from Carbon Fiber Reinforced Plastics
Summary
Composites made from Carbon Fiber Reinforced Plastics (CFRP) have superior material properties in comparison with metallic components, such as: light weight, robustness, damage tolerance, fatigue strength and corrosion resistance. CFRP based composites are being increasingly used as structural components in many industrial applications such as aerospace, shipping and automotive. Due to their permanent exposure to external forces resulting from impact events or to the action of alternating loading, the performance of composite structures can be harmfully alterated. Either resulting from manufacturing or in-service induced damage cannot be always identified by simple visual inspection. Various non-destructive testing (NDT) techniques have been used to detect and evaluate defects and damage. These include acoustic emission, ultrasonic testing, eddy current, thermography, shearography, X-ray, ultrasonic waves,
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