Kourra, Nadia, Warnett, Jason M., Attridge, Alex, Dahnel, Aishah Najiah, Ascroft, Helen, Barnes, Stuart and Williams, M. A. (2017) A metrological inspection method using micro-CT for the analysis of drilled holes in CFRP and titanium stacks. International Journal of Advanced Manufacturing Technology, 88 (5-8). pp. 1417-1427. doi:10.1007/s00170-016-8691-4 ISSN 0268-3768.

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Abstract

This paper demonstrates a novel method that combines X-ray computed tomography (CT) and image processing for investigating two materials with significantly different densities. CT is increasingly used in industrial applications of inspecting materials and defects. The limitations of the system and data reconstruction are continuously researched so as to improve the quality of the results. One of the most common issues in CT is beam hardening, frequently experienced in multi-material scanning. The materials examined to demonstrate the method are carbon fibre reinforced polymers (CFRP) and titanium alloy Ti6Al4V, often used in combination in industry to optimise the weight to strength ratio. The assembly of the materials is usually achieved by bolting and riveting, which requires drilling through the two materials together. The machining of these materials is difficult due to their higher specific properties and as a result tool wear is always an issue. CFRPs properties depend on the nature, orientation and bond of the fibres and as a result drilling affects their service life. The results of the method ensure the quality of the drilled holes by measuring the variation of the maximum diameter, circularity, positioning of the hole and an examining the entrance delamination and exit burrs by image processing.

Item Type:	Journal Article
Subjects:	T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH):	Machining -- Technological innovations, Drilling and boring -- Computer programs, Tomography , Carbon fiber-reinforced plastic, Titanium alloys
Journal or Publication Title:	International Journal of Advanced Manufacturing Technology
Publisher:	Springer UK
ISSN:	0268-3768
Official Date:	February 2017
Dates:	Date Event February 2017 Published 14 May 2016 Available 27 March 2016 Accepted 4 December 2015 Submitted
Volume:	88
Number:	5-8
Page Range:	pp. 1417-1427
DOI:	10.1007/s00170-016-8691-4
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	16 May 2016
Date of first compliant Open Access:	16 May 2016
Funder:	BAE SYSTEMS (Firm), Engineering and Physical Sciences Research Council (EPSRC)

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