Abstract
Eddy current testing is widely used for non-destructive evaluation of conductive materials where an induced current created by a variable magnetic field propagate on the material surface and sensed by a special sensor. The main purpose of this paper is to study the influence of the stress field near the crack tip especially in the singular and elaborated zones of aeronautical material aluminium 7075-T6 to eddy current non-destructive testing enhanced with a very particular type of probe to have better stresses sensitivity. This experimental part understands impedance variations due to the stress with high measurement reliability and shows that eddy current control is very sensitive to the stress and produces significant changes in magnetic parameters that mean stress should be considered in mechanical parts inspection.
Highlights
Fracture mechanics is the mechanical analysis of materials containing one or more macroscopic cracks to predict failure apparition
Eddy current testing is applied to conductive materials where an induced current created by a variable magnetic field propagate on the material surface and sensed by a special sensor [3]
The plate is made with aeronautical material Al 7075-T6, which is commonly used in aeronautics and aerospace
Summary
Fracture mechanics is the mechanical analysis of materials containing one or more macroscopic cracks to predict failure apparition. This analysis is generally non-destructive and done by the strain and stress fields’ determination near the crack tip where singularity problems must be taken into consideration [1]. Non-destructive testing detects surface or internal defect without damaging the material in order to guaranty the systems safety. Eddy current testing is applied to conductive materials where an induced current created by a variable magnetic field propagate on the material surface and sensed by a special sensor [3]. The current distribution depends on geometry, electrical conductivity, and magnetic permeability of the material. The eddy current testing can be analysed by the resistance, the reactance, and the ISSN PRINT 2335-2124, ISSN ONLINE 2424-4635, KAUNAS, LITHUANIA
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