Modeling the ultrasound reflection from immersed laminates and its application in adhesive bond inspections

• Ano de defesa: 2018
• Autor(a) principal: Junqueira, Bernardo Feijó
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Federal do Rio de Janeiro; Brasil; Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia; Programa de Pós-Graduação em Engenharia Mecânica; UFRJ
• Palavras-chave em Português: Incorporação invariável; Inspeção de interface; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
• Link de acesso: http://hdl.handle.net/11422/12057

This work presents an approach for the determination of an optimal experiment design to identify faults in laminated structures immersed in acoustic fluid. The spring boundary conditions are used for the adhesive bonds and adhesion imperfections are modeled reducing the corresponding spring constants. The formulation is developed with the aid of the invariant embedding technique and, accordingly, it is numerically unconditionally stable. The frequencies/angles of incidence that are most sensitive to adhesion flaws are identified by analyzing the reflection coefficient of a healthy and a flawed plate. Such frequencies/angles of incidence are presumably the optimum choices for the inspecting field in adhesive bond ultrasound evaluations.