A novel damage index for fatigue damage detection in a laminated composites using lamb waves

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dc.contributor Barkey, Mark E.
dc.contributor Wei, Song
dc.contributor.advisor Roy, Samit
dc.contributor.author Seki, Daigo
dc.date.accessioned 2017-03-01T17:37:45Z
dc.date.available 2017-03-01T17:37:45Z
dc.date.issued 2015
dc.identifier.other u0015_0000001_0002123
dc.identifier.other Seki_alatus_0004M_12520
dc.identifier.uri https://ir.ua.edu/handle/123456789/2507
dc.description Electronic Thesis or Dissertation
dc.description.abstract A well-established structural health monitoring (SHM) technique, the Lamb wave based approach, is used for fatigue damage identification in a laminated composite. A novel damage index, ‘normalized correlation moment’ (NCM) which is composed of the nth moment of the cross correlation of the baseline and comparison waves, was used as damage index for monitoring damage in composites and compared with the signal difference coefficient (SDC) which is one of the most commonly used damage indices. Composite specimens were fabricated by the hand layup method by followed by compression. Piezo electric disks mounted on composite specimens were used as actuators and sensors. Three point bending fatigue tests were carried out on an intact composite laminate and a delaminated composite laminate with [06/904/06] orientation. Finite element analysis was performed to test the validity of SDC and NCM for fatigue damage.
dc.format.extent 81 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Aerospace engineering
dc.subject.other Mechanical engineering
dc.title A novel damage index for fatigue damage detection in a laminated composites using lamb waves
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Dept. of Aerospace Engineering and Mechanics
etdms.degree.discipline Aerospace Engineering
etdms.degree.grantor The University of Alabama
etdms.degree.level master's
etdms.degree.name M.S.


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