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dc.contributor.advisorKwon, Young W.
dc.contributor.authorLipsey, Stephen A.
dc.dateDecember, 1999
dc.date.accessioned2012-09-07T15:34:14Z
dc.date.available2012-09-07T15:34:14Z
dc.date.issued1999-12
dc.identifier.urihttp://hdl.handle.net/10945/13449
dc.description.abstractDamage reduces the flexural stiffness of a structure, thereby altering its dynamic response. Considerable effort has been put into obtaining a correlation between the changes in modal parameters and the location and amount of the damage within the structure. Most numerical research employed elements with reduced beam stiffiness to simulate damage in the beam. This approach to damage simulation neglects the non-linear effect that a crack has on the structural dynamic response. In the present study, finite element modeling techniques are utilized to directly represent an embedded crack. The results of the dynamic analysis of the present model are then compared to the results of the dynamic analysis of the reduced modulus finite element model. Different modal parameters are investigated to determine the most sensitive indicator of damage and fts location. Nonlinear effects, such as crack closure and opening, of an embedded crack on the structural dynamic response were also studied from transient nonlinear analysis. The modeling technique is then applied to sandwich composite beams with simulated delamination to investigate damage detection techniques through the use of damping caused by frictional dissipation of energy on the crack surface.en_US
dc.description.urihttp://archive.org/details/numericalstudyfo1094513449
dc.format.extentxii, 51 p.;28 cm.en_US
dc.language.isoen_US
dc.publisherMonterey, California: Naval Postgraduate Schoolen_US
dc.titleNumerical study for Global Detection of cracks embedded in beamsen_US
dc.typeThesisen_US
dc.description.serviceU.S. Navy (U.S.N.) author.en_US
etd.thesisdegree.nameM.S. in Mechanical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineMechanical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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