Title:
Nonlinear ultrasonic guided waves for quantitative life prediction of structures with complex geometries

dc.contributor.advisor Sabra, Karim G.
dc.contributor.advisor Leamy, Michael J.
dc.contributor.author Autrusson, Thibaut Bernard en_US
dc.contributor.committeeMember Laurence Jacobs
dc.contributor.department Mechanical Engineering en_US
dc.date.accessioned 2011-03-04T20:09:40Z
dc.date.available 2011-03-04T20:09:40Z
dc.date.issued 2009-11-09 en_US
dc.description.abstract Material damage such as dislocations and microcracks are characteristic of early stages of fatigue. Accumulation of these nascent cracks leads to non-linear elastic response of the material. These non-linearities can be detected from harmonic generation for propagating elastic waves. The long term goal of this study is to investigate the non-linear elastic propagation in parts with complex geometry. Cellular Automata is introduced as a new simulation method, in order to develop new analysis on quadratic non-linearities. An existing linear code was progressively modified to take into account a different constitutive law. Also the boundary conditions need to be reviewed to ensure free stress with the non-linear behavior. The propagation of the longitudinal wave is investigated in detail. Numerical accuracy is validated from comparison with a closed, for both linear and non-linear code. The reflection of the non-linear P-wave gives confirmation for the correct treatment of the boundary condition. Finally the capabilities of the Cellular Automata code are underlined for reflection of Lamb waves for various boundary conditions. en_US
dc.description.degree M.S. en_US
dc.identifier.uri http://hdl.handle.net/1853/37103
dc.publisher Georgia Institute of Technology en_US
dc.subject Accuracy en_US
dc.subject Cellular Automata en_US
dc.subject Numerical code en_US
dc.subject Lamb wave en_US
dc.subject.lcsh Structural stability
dc.subject.lcsh Service life (Engineering)
dc.subject.lcsh Ultrasonic waves Industrial applications
dc.title Nonlinear ultrasonic guided waves for quantitative life prediction of structures with complex geometries en_US
dc.type Text
dc.type.genre Thesis
dspace.entity.type Publication
local.contributor.advisor Leamy, Michael J.
local.contributor.advisor Sabra, Karim G.
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
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relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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