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Perspetiva Teórica de Diferentes Tipos de Ligações Coladas Sujeitas a Ações Monotónicas
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O presente trabalho aborda um estudo paramétrico sobre a caracterização do comportamento
de descolamento em três tipos de ligações coladas quando sujeitas a um carregamento monotónico.
A motivação para a realização deste estudo surgiu da necessidade de aprofundar trabalhos já
realizados por vários investigadores, para um conhecimento mais detalhado sobre o comportamento
da ligação híbrida colada quando sujeita a carregamento puramente monotónico.
Nesta dissertação é realizada uma análise com recurso ao Método dos Elementos Discretos
para analisar a interface entre dois materiais colados. O comportamento na interface é discretizado
através de molas axiais e de corte, e é definido utilizando um modelo analítico bilinear
força-deslizamento.
Três geometrias de ligação colada foram selecionadas e estudadas permitindo realizar comparações
entre os resultados obtidos: ligação colada em sobreposição dupla, em degrau duplo e
degrau triplo. Foram também selecionados dois materiais estruturais para os aderentes, polímeros
reforçados com fibras de carbono (da literatura internacional Carbon Fiber Reinforced
Polymers - CFRP) e a liga de alumínio 7050, comtemplando-se, ainda diferentes rácios de rigidez
axial. No total, foram realizadas 36 simulações.
Com base numa avaliação das respostas carga-deslizamento, slip-comprimento colado, distribuição
de tensões e análise do dano ao longo da ligação, este trabalho permitiu identificar qual
a ligação colada com melhor desempenho face a um carregamento monotónico e consistente
com o 2º modo de fratura.
The present paper is devoted to a parametric study on the characterization of the debonding behavior of three types of bonded joints when subjected to monotonic loading consistent with fracture mode II. The motivation of this study arose from the need to study, in more detail, the work developed so far by other researchers and provide more detailed knowledge about the behavior of hybrid bonded connections when subjected to a purely mode II monotonic loading. In this dissertation an analysis using the Discrete Element Method (DEM) is performed to analyze the interfacial bond behavior of hybrid bonded joints with different geometries. The behavior at the interface is discretized using axial and shear springs and is defined using a bilinear force-slip analytical model. Three types of bonded joints with different geometries were selected and studied which also allowed the comparison of the results obtained from the: double overlap, double step, and triple step bonded joints. Two structural materials for the adherends, Carbon Fiber Reinforced Polymers (CFRP) and aluminum alloy 7050, were selected, and a set of axial stiffness ratios were chosen. A total of 36 simulations were carried out. Based on the assessment of the load-slip responses, bonded slip-length, stress distribution and damage analysis throughout the bonded length of the most advantageous CFRP bonded connection was identified.
The present paper is devoted to a parametric study on the characterization of the debonding behavior of three types of bonded joints when subjected to monotonic loading consistent with fracture mode II. The motivation of this study arose from the need to study, in more detail, the work developed so far by other researchers and provide more detailed knowledge about the behavior of hybrid bonded connections when subjected to a purely mode II monotonic loading. In this dissertation an analysis using the Discrete Element Method (DEM) is performed to analyze the interfacial bond behavior of hybrid bonded joints with different geometries. The behavior at the interface is discretized using axial and shear springs and is defined using a bilinear force-slip analytical model. Three types of bonded joints with different geometries were selected and studied which also allowed the comparison of the results obtained from the: double overlap, double step, and triple step bonded joints. Two structural materials for the adherends, Carbon Fiber Reinforced Polymers (CFRP) and aluminum alloy 7050, were selected, and a set of axial stiffness ratios were chosen. A total of 36 simulations were carried out. Based on the assessment of the load-slip responses, bonded slip-length, stress distribution and damage analysis throughout the bonded length of the most advantageous CFRP bonded connection was identified.
Descrição
Palavras-chave
Ligação colada rácio de rigidez axial MED deslizamento CFRP