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Measuring delamination in carbon/epoxy composites using a shadow moire laser based imaging technique
Faculty
Not Specified
Year:
2007
Type of Publication:
Article
Pages:
113-118
Authors:
Khashaba, U. A, Seif, M. A, Rojas-oviedo, R
DOI:
10.1016/j.compstruct.2005.11.039
Journal:
COMPOSITE STRUCTURES ELSEVIER SCI LTD
Volume:
79
Research Area:
Materials Science
ISSN
ISI:000246060100013
Keywords :
carbon/epoxy composites, shadow moire, image processing, laser, delamination, machining, mechanical drilling
Abstract:
Delamination is considered one of the most serious problems associated with the machining of fiber-rein forced composite materials. The evaluation of the drilling-induced delamination damage in these materials is rather difficult, particularly for the carbon fiber-based composites. This is attributed to their color that makes the current visual inspection techniques extremely difficult. This paper presents a non-contact nondestructive technique for measuring and determining the extent of delamination in composite materials. The approach developed consists of utilizing a shadow moire laser based imaging technique. This technique allows the assessment of the degree of delamination resulting from the machining processes necessary for final set-up and assembly. Mechanical drilling has been implemented on carbon fiber reinforced epoxy (CFRE) composites. The effects of cutting variables (feed and speed) on the delamination size in mechanical drilling of CFRE composites have been investigated. The discussed work should improve reliability and economy in fabrication and assembly of carbon fiber-based composites. Moreover, the results show that the proposed technique is easily adaptable to typical manufacturing environments and possesses promising advantages with respect to accuracy and simplicity. (c) 2006 Elsevier Ltd. All rights reserved.
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