SYMPOSIA PAPER Published: 01 December 1979
STP36025S

Liquid Crystals for Flaw Detection in Composites

Source

Liquid crystals have been investigated as an inexpensive nondestructive testing (NDT) technique for composite materials. By imaging the surface temperature distribution on both cyclically loaded and unloaded materials, subsurface flaws are found to be detectable. For specimens under load, likely damage locations and subsequent damage development can be determined. Cut fibers, inclusions, and geometric discontinuities served as flaws. Fiber glass/epoxy and graphite/epoxy composites were tested. It was found that liquid crystals can be used as an alternative to other NDT methods in many cases.

Author Information

Charles, JA
The Ohio State University, Columbus, Ohio
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Details
Developed by Committee: D30
Pages: 72–82
DOI: 10.1520/STP36025S
ISBN-EB: 978-0-8031-4761-4
ISBN-13: 978-0-8031-0527-0