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Lattice mechanical metamaterials are widely applied in various protective structures due to their excellent mechanical properties and crashworthiness. Traditional lattice structures are often composed of periodically arranged regular porous materials. Inspired by the microcrystalline structures of metals，in this paper random grain boundary structures are incorporated into the design of lattice materials，then polycrystal lattice material specimens using 3D printing technology are prepared. Furthermore，crashworthiness studies are conducted based on the finite element models validated by experiments. The results show that compared to single crystal lattice materials，polycrystal lattice materials significantly improve specific energy absorption （SEA） at the same lattice angle，especially with 143% increase at the lattice angle of 30°. The crashworthiness of polycrystal lattice materials is influenced by grain size，intragranular lattice angle，and grain randomness. When grain size decreases，the energy absorption process becomes smoother，but excessively small grains may exacerbate fluctuations in the energy absorption process due to boundary effect. Polycrystal lattice materials with a 45° lattice angle and random lattice angles of 30°/60° exhibit stable energy absorption processes，and those with higher randomness in grain orientations show an even smoother energy absorption process. The novel polycrystal lattice mechanical metamaterials proposed in this paper can effectively enhance the crashworthiness of traditional lattice materials and provide guidance for the design and optimization of new lightweight lattice metamaterials.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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