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| 1 | New advances in fiber-reinforced composite honeycomb materials显示文摘In sandwich structures,lightweight cellular materials as the core hold the face sheets far away from the neutral axis to maximize the bending performance of the structure.Honeycomb materials as a major type of lightweight cellular materials have been widely applied in various fields,including aerospace,vehicle,marine,architecture and mechanical engineering,due to reliable mechanical properties and excellent designability.Using fiber-reinforced composites is an efficient method to develop ultralight honeycomb materials with superior mechanical behaviors.In recent years,fiber-reinforced composite honeycomb materials possessing lightweight and excellent mechanical performances have attracted noticeable attention to replacing traditional aluminum honeycombs and Nomex honeycombs.Compared to metal,polymer and Nomex paper,fiber-reinforced composites possess various merits,such as high specific stiffness and specific strength,excellent fatigue property,corrosion resistance and high-temperature resistance.Thus,the applications of fiber-reinforced honeycomb material for sandwich core have unlimited potential in hypersonic vehicles,long-range rockets,cargo vessels and protective systems.Although the fact that attention has been rapidly increasing,there is a lack of comprehensive reviews of new advances in the field of fiber-reinforced composite honeycomb materials.In this review,new advances reported by different scientists in the field of fiber-reinforced honeycomb materials have been reviewed and analyzed to provide an in-depth overview and knowledge for beginners in the field of ultralightweight and high-performance composite sandwich architectures.The challenges and prospects for the development of fiberreinforced honeycomb materials have also been presented. | WEI XingYu XIONG Jian WANG Jie XU Wu | 2020 | Science China(Technological Sciences)2020，63，8： | 8 |
| 2 | Enhanced design of hourglass truss sandwich structures for compressive resistance显示文摘In this article,the design of the hourglass truss sandwich structure is improved by optimizing the number of layers to enhance the compressive strength of both the core and the face sheet and then its mechanical performance. The hourglass truss structures characterized by three different numbers of layers are manufactured using an interlocking and vacuum brazing method. The effect of the layer number of the hourglass core panels on their out-of-plane compression and in-plane compression performance is investigated,and the results from calculations and experiments are in reasonable agreement. The results show that as the layer number of the hourglass core increases,the out-of-plane compressive strengths show little change,but their energy absorption properties are effectively increased. The in-plane compressive failure mechanism maps are constructed,and the specimens are designed to examine the local elastic and inelastic buckling failure modes of the face sheets. The results suggest that as the number of layers of the hourglass core increases,its maximum in-plane compressive load increases. The maximum in-plane compressive loads of the two-layer hourglass truss panels are 57%–70% higher than those of the single-layer panels. It can also be concluded that the out-of-plane and in-plane compression mechanical properties of the multilayer hourglass truss outperform those of the pyramidal truss. Furthermore,the number of layers of the hourglass core is optimized in consideration of both mechanical properties and fabrication cost. | FENG LiJia YU GuoCai MA Li WU LinZhi ZHANG AMan | 2020 | Science China(Technological Sciences)2020，63，12： | 0 |
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