Abstract
Structural sandwich composites have been widely used in many engineering applications, and this trend continues due to their superior mechanical properties, thermal insulation and acoustic damping. However, to further improve their mechanical properties, literature reports significant benefits obtained with nano-reinforcements. In this context, nanoclays are the most popular nano-reinforcements for polymeric nanocomposites, due to their relatively high ion exchange capacity, high aspect ratio and economic advantages. In order to stablish a systematic understanding for design criteria, this work intends to summarize all studies present in the open literature about this topic. It was possible to conclude that using nanoclays improves the mechanical properties of structural sandwich composites, especially in terms of impact strength. Nevertheless, the benefits obtained regarding fatigue performance are not adequately reported in the literature, revealing the need to develop these studies.
Highlights
Sandwich composites are structures made of rigid outer layers— known as skin—and an inner layer, known as the core
The results showed that the samples with nanoclay insertions in the foam core exhibited higher peak loads than those produced with the neat foam core
In 2015, Nasirzadeh et al [26] carried out high velocity impact tests in order to evaluate the effect of nanoclays content in a sandwich composed of glass fiber skins and polyurethane foam core
Summary
Sandwich composites are structures made of rigid outer layers— known as skin—and an inner layer, known as the core. Building composite structures with these two types of materials make it possible to design structural components with good outer-layer mechanical properties, and simultaneously, good impact and vibration tolerances within the core layer, making them good options for aerospace, marine and wind power industries [9,10]. In order to improve the performance of sandwich composites, it is possible to add nano reinforcements to the base material. One such nano reinforcement often used is nanoclay (NC), which is a new generation of processed clay composed mainly of silicon dioxide (SiO2 ) and aluminum oxide (AlO6 ) in different proportions, depending on the type. Literature, as well theas benefits discussed, in terms of their into the core skin
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