Preliminary Evaluation of the Potential and Limitations of Microwave NDI Methods for Inspecting Graphite Composites
Abstract
The potential for using microwave nondestructive testing methods for inspecting graphite composites to detect embedded materials and impact damage are examined in this paper. Specially prepared graphite/epoxy panels are inspected with an open-ended waveguide reflectometer at various frequencies and liftoffs. The results show the possibility of manipulating signal polarization (with respect to the fiber orientation) to detect embedded materials. For cross-ply laminates, the microwave signal is almost totally reflected off of the surface and no appreciable signal penetration is possible. However, impact damage, a surface defect, is detected both in unidirectional and cross-ply laminates. These preliminary results are encouraging for the use of microwave signals when inspecting certain graphite composite structures.
Recommended Citation
R. Zoughi et al., "Preliminary Evaluation of the Potential and Limitations of Microwave NDI Methods for Inspecting Graphite Composites," Materials Science Forum, vol. 210-213, pp. 611 - 618, Trans Tech Publications, May 1996.
The definitive version is available at https://doi.org/10.4028/www.scientific.net/MSF.210-213.611
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
Crystal Defects; Crystal Structure; Graphite; Laminated Composites; Microwaves; Nondestructive Examination; Polarization; Reflectometers; Surfaces; Cross Ply Laminates; Embedded Materials; Impact Damage; Microwave Signals; Open Ended Waveguide Reflectometer; Signal Polarization; Composite Materials; Embedded Defects; Graphite Composites; Microwave Nondestructive Inspection
International Standard Serial Number (ISSN)
0255-5476
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 1996 Trans Tech Publications, All rights reserved.
Publication Date
01 May 1996
