Detecting Micro-Structure and Flaws in Composites Using Eddy-Current Instrumentation
Date
Authors
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Authors
Research Projects
Organizational Units
Journal Issue
Is Version Of
Versions
Series
Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
Department
Abstract
Eddy-current inspection of advanced composite materials appears to overcome some of the difficulties typical of ultrasonic inspection. For example, carbon-carbon material can be inspected using eddy-currents without making the sample wet or using any acoustic coupling substances. Eddy-current inspection is very good for detecting fibers and fiber content because the fibers usually conduct electricity very well. Eddy-current measurements can therefore detect broken fibers in many cases where ultrasonic inspection fails to find the damage (broken fibers are not always good at scattering the ultrasonics). One of the common arguments against using eddy-currents to inspect composite materials is that they are unable to detect delaminations. This paper presents experimental evidence that suggests that delaminations can be detected with eddy-current inspection. Sabbagh [4] offer theoretical reasoning for the delamination behavior. This paper also presents some experimental data that indicates fiber structure, impact damage, and drilled holes in advanced composite material, including carbon-carbon and graphite-epoxy.