The adaptability and mobility of high-end equipment in extreme war environments guarantee national defense security and are of great strategic significance.To advance the upgrading of such equipment,a key step is to improve the lightweight level and functionality of the main load-bearing structures.The high-end equipment working under the extreme coupled multi-field environment puts forward high demands on lightweight and mul-tifunctionality of the main load-bearing components.The separation of load-bearing structures and functional components(e.g.,vibration and noise reduction,bullet and explosion resistance,impact energy absorption,heat dissipation,and wave absorption parts,etc.)in existing equipment,results in structure and weight redun-dancy,making it difficult to further improve the operational performances.Therefore,there is an urgent need to develop ultralight,compact,load-bearing,and multifunctional metastructures.Herein,the concept of ultra-light,compact,and load-bearing metastructures was proposed for the first time and a clear definition was giv-en.A series of design schemes for prototype metastructures were summarized in combination with practical en-gineering application requirements.Future development directions of metastructures are also envisioned.
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