Estudio numérico de la propagación de ondas guiadas en rieles ferroviarios

• Ano de defesa: 2017
• Autor(a) principal: Idzi, Javier Luis
• Orientador(a): Iturrioz, Ignacio
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: spa
• Palavras-chave em Português: Propagação de ondas; Trilhos ferroviários; Ensaios não-destrutivos
• Palavras-chave em Inglês: Dispersion curves; Guided waves; Nondestructive testing; Rail
• Link de acesso: http://hdl.handle.net/10183/172119

In recent decades techniques related to the measurement of elastic waves have advanced significantly. It is now possible with relatively inexpensive equipment to record amplitudes and frequency bands that were unthinkable two decades ago. This has led to the development of theoretical topics which application was questionable until not long ago, to profit from new technological potential in obtaining more and better experimental information. In this context the study of the propagation of guided waves in solids is presented as a knowledge that allows to detect damage with efficiency and economy in a number of structures in which at least one dimension is much larger than the other two. This is the case for rails, tubulations and pressure vessels among others. In this work, guided waves propagation characteristics are studied, first in a prismatic bar and then within the geometry of a rail. In both cases, dispersion curves were computed according two different work methodologies, first using an axisymmetric model and then corroborated with a model of periodic conditions. Finally propagation of a Tone-Burst waves were simulated on the analyzed geometries, leading to the discussion of how the waves scatter along its propagation. The results obtained were the dispersion curves of both sections.