Experimental analysis and FEA modeling of sensor response in composites for structural health monitoring

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dc.contributor Burkett, Susan L.
dc.contributor Roy, Samit
dc.contributor Barkey, Mark E.
dc.contributor.advisor Burkett, Susan L.
dc.contributor.author Nagabhushana, Akshata H.
dc.date.accessioned 2017-03-01T16:25:27Z
dc.date.available 2017-03-01T16:25:27Z
dc.date.issued 2012
dc.identifier.other u0015_0000001_0000876
dc.identifier.other Nagabhushana_alatus_0004M_11081
dc.identifier.uri https://ir.ua.edu/handle/123456789/1376
dc.description Electronic Thesis or Dissertation
dc.description.abstract Reliable damage detection is crucial for assessing the integrity of a structure. A structural health monitoring (SHM) system reduces the chances of fatal accidents by performing continuous monitoring of a structure. In this thesis, a well-established SHM technique, the Lamb wave-based approach, is used for damage detection in composite materials. Composite coupons are fabricated using a vacuum assisted resin transfer molding (VARTM) process. The damage to be detected is a pre-existing transverse crack in the coupon. Surface mounted piezoelectric actuators are used to generate Lamb waves in the composite coupon. Experiments were carried out on a composite coupon with a manufactured embedded crack-like defect in the middle four plies for two different orientations, [016]_T and [0_6/90_4/0_6]_T and a composite coupon with a surface crack with [016]_T orientation. The response from both undamaged and damaged (simulated crack) coupons is obtained using surface mounted piezoelectric sensors. A numerical study of the composite coupon with the simulated crack was conducted using finite element methods (FEM) and the model was verified using the experimental results. The FEM model is validated for crack modeling using static shear lag analysis applied at the crack as well as for dynamic loading. The active Lamb wave method, using the anti-symmetric mode, could detect a surface crack but was insensitive to the embedded crack. The effect of crack depth and crack location on damage detection efficiency was also studied. FEM models were also used for sensor placement optimization.
dc.format.extent 90 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 Electrical engineering
dc.subject.other Aerospace engineering
dc.title Experimental analysis and FEA modeling of sensor response in composites for structural health monitoring
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Dept. of Electrical and Computer Engineering
etdms.degree.discipline Electrical and Computer Engineering
etdms.degree.grantor The University of Alabama
etdms.degree.level master's
etdms.degree.name M.S.

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