چکیده مقاله
Conventional eddy current techniques have been used to a great extent for detection of surface breaking defects in conductive materials However, detection of sub surface defects is limited due to skin effect phenomena and material properties Pulsed Eddy Current PEC techniques excite the probe’s driving coil with a repetitive broadband pulse, usually a square wave The resulting transient current through the coil induces transient eddy currents in the test piece, these pulses consist of a broad frequency spectrum, and the reflected signal contains important depth information The work in this paper employs COMSOL Multiphysics, the finite element FE modelling software, to investigate the behaviour of a new encircling probe design This work involves modelling of an encircling coil around a steel pipe with high lift off to simulate insulation The 3D modelling of the coil wrapped around a steel pipe was employed and surface breaking discontinuities were modelled The simulation of these scenarios provided essential information about the behaviour of this probe design
کلیدواژهها
نویسندگان
Shiva Majidnia
Brunel University, Uxbridge, United Kingdom TWI Ltd, Cambridge, United Kingdom
John Rudlin
TWI Ltd, Cambridge, United Kingdom
Rajagopal Nilavalan
Brunel University, Uxbridge, United Kingdom
شیوه ارجاع
Majidnia, Shiva and Rudlin, John and Nilavalan, Rajagopal,1392,Investigation on a Pulsed Eddy Current System for Flaw Detection Using an Encircling Coil on a steel pipe,The first international conference on welding and non-destructive testing, the 14th national conference on welding and inspection, and the third national conference on non-destructive testing.,Karaj
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