Please use this identifier to cite or link to this item: http://hdl.handle.net/11189/2614
Title: Modal frequency versus shearography in detecting and locating voids/delaminations in sandwhich composites
Authors: Gryzagoridis, Jasson 
Oliver, GJ 
Findeis, DM 
Issue Date: 2013
Source: Gryzagoridis, J., Oliver, G., & Findeis, D. (2013). Modal frequency versus shearography in detecting and locating voids/delaminations in sandwich composites. Insight-Non-Destructive Testing and Condition Monitoring, 55(5), 249-252.
Abstract: This paper reports on the attempt by the authors to establish a novel non-destructive testing protocol in detecting the presence and location of subsurface defects, such as voids or delaminations, in sandwich composites. The work performed was based on the premise that the presence of a defect in a composite structure would affect its modal frequencies when subjected to vibratory excitation. Experiments were carried out using various types of sandwich composites fashioned as built-in cantilever beams, which were perturbed by airborne vibrations. As predicted by a parametric finite element analysis, the modal frequencies of the cantilever were modestly affected by the presence of a defect; however, its position along the length of the beam could not easily be determined. For comparison purposes, the same cantilever specimens were subjected to thermal excitation and inspected using a portable digital shearography system. As expected, the presence and location of the defects were readily and vividly identified.
URI: http://hdl.handle.net/11189/2614
Appears in Collections:Eng - Journal articles (DHET subsidised)

Files in This Item:
File Description SizeFormat 
Gryzagoridis_J_Oliver_GJ_Findeis_DM_Eng_2013.pdfMain Article949.87 kBAdobe PDFView/Open
Show full item record

Page view(s)

13
Last Week
0
Last month
1
checked on Sep 19, 2018

Download(s)

5
checked on Sep 19, 2018

Google ScholarTM

Check


Items in Digital Knowledge are protected by copyright, with all rights reserved, unless otherwise indicated.