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Proceedings Paper

Acoustic emission felicity ratio measurements in carbon composites laminates using fiber Bragg grating sensors
Author(s): Nehemiah Mabry; Curtis Banks; Houssam Toutanji; Mohamed Seif
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Paper Abstract

In light of ongoing efforts to reduce weight but maintain durability, designers have examined the use of carbon composite materials for a number of aerospace and civil structures. Along with this has been the study of reliable sensing and monitoring capabilities to avoid catastrophic failure. Fiber Bragg Grating (FBG) sensors are known to carry several advantages in this area one of which is their proven ability to detect acoustic emission (AE) lamb waves of various frequencies. AE is produced in these materials by failure mechanisms such as resin cracking, fiber debonding, fiber pullout and fiber breakage. With such activity there is a noticeable change in Felicity Ratio (FR) in relation to the increase of accumulated damage. FR is obtained directly from the ratio of the stress level at the onset of significant emission and the maximum prior stress at the same AE event. The main objective of this paper is to record the FRs of a carbon/epoxy laminate using FBG sensors and establish its trend as a method for determining accumulated damage in a carbon composite structure.

Paper Details

Date Published: 15 April 2011
PDF: 10 pages
Proc. SPIE 7982, Smart Sensor Phenomena, Technology, Networks, and Systems 2011, 79820Y (15 April 2011); doi: 10.1117/12.885865
Show Author Affiliations
Nehemiah Mabry, The Univ. of Alabama in Huntsville (United States)
Curtis Banks, NASA Marshall Space Flight Ctr. (United States)
Houssam Toutanji, The Univ. of Alabama in Huntsville (United States)
Mohamed Seif, Alabama A&M Univ. (United States)

Published in SPIE Proceedings Vol. 7982:
Smart Sensor Phenomena, Technology, Networks, and Systems 2011
Wolfgang Ecke; Kara J. Peters; Theodore E. Matikas, Editor(s)

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