Investigation on a Pulsed Eddy Current System for Flaw Detection Using an Encircling Coil on a steel pipe
Publish Year: 1392
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
INCWI14_032
تاریخ نمایه سازی: 13 بهمن 1398
Abstract:
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.
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Authors
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