Title:
Nonlinear ultrasonic guided waves for quantitative life prediction of structures with complex geometries
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 | |
relation.isAdvisorOfPublication | 57dc2bf2-f2ca-46a1-814b-1aaab829df46 | |
relation.isAdvisorOfPublication | 746faa42-e7e0-4510-969d-e841de5920da | |
relation.isOrgUnitOfPublication | c01ff908-c25f-439b-bf10-a074ed886bb7 | |
relation.isOrgUnitOfPublication | 7c022d60-21d5-497c-b552-95e489a06569 |
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