NDLI: Use of modal acoustic emission to monitor damage progression in carbon fiber/epoxy tows and implications for composite structures

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Use of modal acoustic emission to monitor damage progression in carbon fiber/epoxy tows and implications for composite structures

Content Provider	NASA Technical Reports Server (NTRS)
Author	Saulsberry, Regor L. Waller, Jess M. Wentzel, Daniel J. Nichols, Charles T.
Copyright Year	2010
Description	This slide presentation reviews the use of Modal Acoustic Emission to monitor damage progression to carbon fiber/epoxy tows. There is a risk for catastrophic failure of composite overwrapped pressure vessels (COPVs) due to burst-before-leak (BBL) stress rupture (SR) failure of carbon-epoxy (C/Ep) COPVs. A lack of quantitative nondestructive evaluation (NDE) is causing problems in current and future spacecraft designs. It is therefore important to develop and demonstrate critical NDE that can be implemented during stages of the design process since the observed rupture can occur with little of no advanced warning. Therefore a program was required to develop quantitative acoustic emission (AE) procedures specific to C/Ep overwraps, but which also have utility for monitoring damage accumulation in composite structure in general, and to lay the groundwork for establishing critical thresholds for accumulated damage in composite structures, such as COPVs, so that precautionary or preemptive engineering steps can be implemented to minimize of obviate the risk of catastrophic failure. A computed Felicity Ratio (FR) coupled with fast Fourier Transform (FFT) frequency analysis shows promise as an analytical pass/fail criterion. The FR analysis and waveform and FFT analysis are reviewed
File Size	4569055
Page Count	39
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20100026035
Archival Resource Key	ark:/13960/t6f23z186
Language	English
Publisher Date	2010-07-22
Access Restriction	Open
Subject Keyword	Nondestructive Tests Epoxy Matrix Composites Acoustic Measurement Composite Wrapping Waveforms Fiber Composites Fast Fourier Transformations Pressure Vessels Failure Analysis Acoustic Emission Composite Structures Damage Failure Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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