Presentation
Inspection and evaluation of dry fibers in thick composites
Center for Nondestructive Evaluation Conference Papers, Posters and Presentations
Document Type
Conference Proceeding
Conference
Review of Progress in Quantitative Nondestructive Evaluation
Publication Date
7-1-2012
Geolocation
(39.737567, -104.9847179)
Abstract
This paper presents the investigation of dry fibers in thick composites. Dry fibers can be defined as lack of epoxy in localized regions. These local regions act as potential defects in thick composites under compressive loads and act as an initiation point for defects such as matrix cracking and delamination. Detection and characterization of dryness in glass/epoxy composites, with thickness greater than one inch, is presented in this paper. One inch samples with dry fibers were fabricated and tested. Detection is carried out with the help of air coupled ultrasonics in both through transmission and singled sided inspection. To characterize the amount of epoxy, time of flight data was correlated with density and fiber volume fraction. Based on the observations a technique was developed for characterization of dryness.
Copyright Owner
American Institute of Physics
Copyright Date
2013
Language
en
Citation Information
Vinay Dayal, Sunil Kishore Chakrapani and Daniel J. Barnard. "Inspection and evaluation of dry fibers in thick composites" Denver, CO(2012) Available at: http://works.bepress.com/vinay_dayal/9/
Copyright 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
This article appeared in AIP Conference Proceedings 1511 (2012): 1036–1042 and may be found at http://dx.doi.org/10.1063/1.4789157.