Abstract
In the scope of this study, finite element analysis is applied in order to determine the effective thermal conductivity of periodic metallic hollow sphere structures (MHSS). Two different joining technologies for the connection of the hollow spheres, namely sintering and adhesive bonding, are considered. For the determination of the thermal conductivity of the MHSS, the temperature dependence of the thermal conductivities of the base materials, i.e. hollow spheres and joining element, are considered. Two different cases, a low and a high temperature gradient within the structure are distinguished. Furthermore, the overall thermal conductivities of sandwich panels with an insulating MHSS core in dependence on the relative face sheet thickness are investigated.
Highlights
Hollow sphere structures constitute an innovative group of advanced composite materials
The high volume fraction of the closed porosity of the structure in combination with a low thermal conductivity of the epoxy resign suggests the application of such materials for thermal insulation
EFFECTIVE THERMAL CONDUCTIVITY The determination of the effective thermal conductivity of metallic hollow sphere structures (MHSS) requires the distinction of two different cases
Summary
Hollow sphere structures (cf. Fig. 1) constitute an innovative group of advanced composite materials. Their characteristics comprise high specific stiffness, good damping properties, energy absorption and thermal insulation Properties opens a wide field of potential multifunctional applications e.g. in automotive or aerospace industry. The coherence of the hollow spheres can be achieved by different joining technologies such as sintering and adhesion. The thermal characteristics of the structure depend on the geometry of the structure and thermal properties of the base materials. The high volume fraction of the closed porosity of the structure in combination with a low thermal conductivity of the epoxy resign suggests the application of such materials for thermal insulation
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