Título : Mechanical characterisation and high temperature analysis of hyperelastic adhesives – Modelling and experimental validation |
Autor : Simon Portillo, Francisco J. Marques, E.A.S. Fabra-Rodriguez, M. da Silva, L.F.M. Sánchez-Lozano, Miguel |
Editor : Elsevier |
Departamento: Departamentos de la UMH::Ingeniería Mecánica y Energía |
Fecha de publicación: 2024-08 |
URI : https://hdl.handle.net/11000/33442 |
Resumen :
Adhesive bonds are subject to multiple environmental conditions that can affect their mechanical performance
during service. Therefore, it is important to evaluate the influence of temperature on adhesive strength, as it can
impact joint safety and should be considered during the design phase. This study presents an analysis of the effect
of high temperatures on the mechanical behaviour of joints made with highly elastic adhesives, specifically a
polyurethane and a silicon-modified polymer. Shear and tensile tests were conducted at temperatures of 23, 50,
and 80 ◦C using dumbbell specimens for tensile tests and single lap specimens (SLJ) for shear tests. The tests were
performed with two different substrates, aluminium (Al) and glass fibre reinforced polyester panel (GRP), and
with varying adhesive thicknesses. These tests aim to assess the impact of temperature conditions on the mechanical properties of the adhesive and the behaviour of the joints. The analysis of the experimental results
reveals that the adhesive degrades when exposed to high temperatures, resulting in reduced strength and stiffness, and less linear behaviour.
Furthermore, this work involves the determination of a model able to reproduce the mechanical behaviour of
hyperelastic adhesive at high temperatures, considering diverse constitutive modelling approaches. To achieve
this, a testing protocol was conducted on basic uniaxial and planar specimens. The results indicate that the
Ogden N=2 model is the most suitable for representing the non-linear behaviour of the hyperelastic adhesive at
high temperatures. In contrast, the Mooney Rivlin model is more suitable to represent the material behaviour
under ambient conditions. To conclude this work, the law has been satisfactorily validated by comparing the
results of tests carried out on SLJ specimens with different adhesive thicknesses.
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Palabras clave/Materias: Temperature FEM Hyperelastic Models Characterisation Flexible Adhesives |
Área de conocimiento : CDU: Ciencias aplicadas: Ingeniería. Tecnología |
Tipo documento : application/pdf |
Derechos de acceso: info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional |
DOI : https://doi.org/10.1016/j.compstruct.2024.118511 |
Aparece en las colecciones: Artículos Ingeniería Mecánica y Energía
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