NDLI: Use of acoustic emission to monitor progressive damage accumulation in kevlar (r) 49 composites

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Use of acoustic emission to monitor progressive damage accumulation in kevlar (r) 49 composites

Content Provider	NASA Technical Reports Server (NTRS)
Author	Saulsberry, Regor L. Waller, Jess M. Andrade, Eduardo
Copyright Year	2009
Description	Acoustic emission (AE) data acquired during intermittent load hold tensile testing of epoxy impregnated Kevlar(Registeres TradeMark) 49 (K/Ep) composite strands were analyzed to monitor progressive damage during the approach to tensile failure. Insight into the progressive damage of K/Ep strands was gained by monitoring AE event rate and energy. Source location based on energy attenuation and arrival time data was used to discern between significant AE attributable to microstructural damage and spurious AE attributable to noise. One of the significant findings was the observation of increasing violation of the Kaiser effect (Felicity ratio < 1.0) with damage accumulation. The efficacy of three different intermittent load hold stress schedules that allowed the Felicity ratio to be determined analytically is discussed.
File Size	3649434
Page Count	12
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20090026552
Archival Resource Key	ark:/13960/t9h46q985
Language	English
Publisher Date	2009-07-26
Access Restriction	Open
Subject Keyword	Composite Materials Nondestructive Tests Schedules Position Location Epoxy Resins Strands Acoustic Emission Damage Kevlar Trademark Loads Forces Load Tests 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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