Abstract：In order to improve the protective performance of fiber lightweight structures subjected to hail impact, the numerical model of bionic sandwich structure was constructed based on the leaf epidermis cell wall bionic structure (bio-ITCLC) with high vertical stiffness. The influence of nose shape, impact velocity and multiple impacts on the mechanical behavior and dynamic damage of bio-ITCLC structures were analyzed. The results showed that the impact force between hail and bio-ITCLC structure was changed with the changing of nose shape of hail. The peak value and raising rate of initial force increased with the contact areal increasing between hail and structure, meanwhile, the loading time of the force was decreasing. The peak value of impact force caused by the cylindrical and conical nose hail linearly increased with the velocity of hail increasing, and the parabolic relation was found between the peak value of impact force generated by the hemispherical nose hail and impact velocity. The main damage modes of bio-ITCLC structures impacted by the cylindrical, conical and cylindrical nose hail were fiber breakage with buckling and crushing, fiber breakage and matrix crack caused indentation, and delamination between bio-core and upper face-sheet, respectively. The damage modes were not changed under the multiple impact of hail, and the delamination of matrix and the area of accumulated damage of the structure were obviously enlarged with the multiple impact increasing.
王海文，徐丹，陈墨林，叶仁传，任鹏. 冰雹形状及重复加载对叶表皮细胞壁仿生结构撞击损伤影响分析[J]. 振动与冲击, 2024, 43(3): 227-232.
WANG Haiwen, XU Dan, CHEN Molin, YE Renchuan, REN Peng. Effects of hail shape and repeated impacts on damage of bionic structure of leaf epidermal cell wall. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(3): 227-232.
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