Title: Eddy current examination of carbon fibres in carbon-epoxy composites and Kevlar

Authors: R. Grimberg, A. Savin, R. Steigmann, A. Bruma

Addresses: Nondestructive Testing Department, National Institute of Research and Development for Technical Physics, 47 D. Mangeron Blvd, 700050 Iasi, Romania. ' Nondestructive Testing Department, National Institute of Research and Development for Technical Physics, 47 D. Mangeron Blvd, 700050 Iasi, Romania. ' Nondestructive Testing Department, National Institute of Research and Development for Technical Physics, 47 D. Mangeron Blvd, 700050 Iasi, Romania. ' Faculty of Physics, Al.I Cuza University, 11 Carol Blvd, 700506, Iasi Romania

Abstract: This paper proposes a method for eddy current non-destructive examination of carbon fibres from carbon epoxy composites as well as the regions impacted with bullets from Kevlar textures. In this aim, an eddy current focused micro sensor, send-receiver type with orthogonal coils was developed. The obtained data were post processed using an incoherent holographic technique. By a small modification of lift-off, the successive layers of fibres can be visualised and, implicitly, their integrity. Using a similar method, the boundaries of the region impacted by a bullet from Kevlar textures were completely emphasised.

Keywords: carbon epoxy composites; carbon fibres; eddy current examination; eddy current holography; eddy current microscopy; non-destructive testing; NDT; bullet impact; bullet-proof jackets; Kevlar body armour; bullet-proof vests.

DOI: 10.1504/IJMPT.2006.011272

International Journal of Materials and Product Technology, 2006 Vol.27 No.3/4, pp.221 - 228

Available online: 10 Nov 2006 *

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