Investigations on the thermo-mechanical behaviour of a complex assembly through dynamic mechanical analyses
Etude du comportement thermomécanique d'un assemblage complexe par essais dynamiques
Résumé
This work investigates the thermo-mechanical behaviour of sandwich structures where the skins are composed of glass/epoxy composite material, and the core consists of a structural epoxy adhesive. This type of structure is of particular interest to the aeronautical industry for the development of multifunctional structures such as composite structures integrating electrical components (conductors, antennas, batteries, super-capacitors, etc.) [1]–[4] which are embedded in the core of the sandwich. The design of such assemblies needs to ensure good interface properties to maintain optimal mechanical performances and electrical insulation of the embedded components during the lifespan of the structure [5], [6]. In particular, internal heating of the embedded components associated with the external thermal environment of an aeronautical structure is a sizing criteria for such structures [1]. Hence, it is necessary to characterize the thermo-mechanical behaviour of these assemblies in order to assess the good integrity of the interfaces and the stress field as a function of the temperature. In this study, the thermo-mechanical behaviour of a composite/epoxy adhesive/composite sandwich is characterized based on experimental data and numerical simulations. To start with, the temperature-dependence of the mechanical properties of the skins and the core are characterized through Dynamic Mechanical Analysis (DMA) testing. The temperature dependencies are then modelled with existing laws [7]–[13], and implemented in a non-linear Finite Element model. Finally, a comparison is made between DMA tests on various assemblies and their corresponding numerical models. The developed methodology allows the use of structural calculations to better characterize multi-layered sandwich structures under DMA testing. It also provides an efficient tool for the prediction of the thermo-mechanical behaviour of multi-layered and multi-material sandwich structures based on the thermo-mechanical behaviour of the constituents.
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Vogel et al. - 2017 - Investigations on the thermo-mechanical behaviour of a complex assembly through dynamic mechanical analyses.pdf (1.36 Mo)
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