SQUID-based nondestructive evaluation of carbon fiber reinforced polymer

Author

Carr, C. ; Graham, D. ; Macfarlane, J.C. ; Donaldson, G.B.

Author_Institution

Dept. of Phys. & Appl. Phys., Univ. of Strathclyde, Glasgow, UK

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

196

Lastpage

199

Abstract

Recent work with HTS SQUIDs in nondestructive evaluation has concentrated on the detection of flaws in aircraft-grade aluminum, with particular emphasis on surface-breaking tears beside rivets. More complex materials are now also being used in aircraft manufacture, with carbon fiber reinforced polymer (CFRP) being one of the most common. Existing technologies such as ultrasound are particularly well suited to the detection of impact-damaged sites and until now there have only been a few reports of eddy current examination of CFRP samples. Here we present results on samples with regions of heat damage, impact damage and with nonmagnetic inserts using eddy current detection techniques. We compare the signal to noise ratio and spatial resolution for a variety of sensors including HTS SQUIDs and gradiometers and conventional induction coils, and discuss variations in detection efficiency with field component measured.

Keywords

SQUID magnetometers; aircraft testing; carbon fibre reinforced plastics; eddy current testing; high-temperature superconductors; HTS SQUIDs; SQUID-based nondestructive evaluation; aircraft manufacture; carbon fiber reinforced polymer; detection efficiency; eddy current detection techniques; field component; gradiometers; induction coils; signal to noise ratio; spatial resolution; Aerospace materials; Aircraft manufacture; Aluminum; Eddy currents; High temperature superconductors; Organic materials; Polymers; SQUIDs; Signal to noise ratio; Ultrasonic imaging;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.813682

Filename

1211575