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dc.contributor.advisorGorman, Michael R.
dc.contributor.authorSmith, Wallace Dean, Jr.
dc.dateDecember 1990
dc.date.accessioned2013-02-15T23:11:13Z
dc.date.available2013-02-15T23:11:13Z
dc.date.issued1990-12
dc.identifier.urihttp://hdl.handle.net/10945/27673
dc.descriptionApproved for public release; distribution is unlimited.en_US
dc.description.abstractThe E-2C Hawkeye, a U.S. Navy aircraft, has experienced problems with fatigue cracks in its wings. This problem was studied in the laboratory using a representative specimen under simulated flight loading. Acoustic emission monitoring was used to detect the stress pulses emitted during cracking. A new wave analysis technique was applied in order to distinguish extraneous noise from crack growth. This technique distinguishes between the extensional and flexural waves in thin aluminum plates. Extensional waves were found to correlate experimentally with waves from crack growth, while noise sources show different waveforms with lower frequencies. It was shown that acoustic emission provided early (crack length less than 0.01 inch) detection of fatigue cracking. This show promise for use in monitoring aircraft fatigue life.en_US
dc.description.urihttp://archive.org/details/acousticemission1094527673
dc.format.extentiv, 72 p. p. ill.en_US
dc.languageen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted.en_US
dc.subject.lcshEngineeringen_US
dc.subject.lcshScienceen_US
dc.subject.lcshAluminumen_US
dc.subject.lcshFatigue.en_US
dc.titleAcoustic emission from spectrum fatigue cracks in 7075 aluminumen_US
dc.typeThesisen_US
dc.contributor.secondreaderDutta, Indranath
dc.contributor.corporateNaval Postgraduate School (U.S.)
dc.contributor.departmentDepartment of Aeronautics and Astronautics
dc.subject.authoraircraft fatigueen_US
dc.subject.authoraging aircraften_US
dc.subject.authorcrack growthen_US
dc.subject.author7075 alumiunumen_US
dc.subject.authorspectrum loadingen_US
dc.subject.authoracoustic emissionen_US
dc.subject.authorplate wavesen_US
dc.description.serviceLieutenant, United States Navyen_US
etd.thesisdegree.nameM.S. in Aeronautical Engineering and Degree of Aeronautics and Astronautics Engineeren_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.levelProfessional Degreeen_US
etd.thesisdegree.disciplineAeronautical Engineeringen_US
etd.thesisdegree.disciplineAeronautics and Astronautics Engineeren_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


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