叶表皮细胞壁仿生结构在冰雹作用下的动力学响应分析  

Dynamic response analysis of a leaf epidermis cell walls bionic structure under hail loading

作　　者：徐丹 韩登安 任鹏[1] 叶仁传 XU Dan;HAN Deng’an;REN Peng;YE Renchuan(School of Naval Architecture&Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212000,China)

机构地区：[1]江苏科技大学船舶与海洋工程学院,江苏镇江212000

出　　处：《振动与冲击》2022年第18期113-120,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(52001145)。

摘　　要：基于具有低横向刚度、高垂直刚度特性的叶表皮细胞壁仿生结构(bio-ITCLC)结合柔性蒙皮,构建了具有小切向刚度和大法向刚度特性的新型仿生夹层结构。以涤纶纤维层合板为基体,建立仿生夹层结构的冰雹撞击有限元仿真模型,验证了冰雹撞击模型的有效性。分析了冰雹速度和直径对叶表皮细胞壁仿生夹层结构动态力学响应及失效模式的影响。结果表明,在冰雹作用下bio-ITCLC芯层与上面板连接位置首先出现开裂,进而上面板产生基体开裂及纤维断裂,冰雹载荷的持续作用使得芯层撞击区域发生屈曲直至压溃。冰雹撞击速度及直径的增加并不会改变bio-ITCLC仿生结构的失效形式,但其对bio-ITCLC仿生夹层结构的作用力随冰雹直径的增大而线性递增,且随撞击速度的增加呈抛物线增长。Based on the leaf epidermis cell wall bionic structure(bio-ITCLC) with low transverse stiffness,high vertical stiffness and flexible skin,a novel bionic sandwich structure with small tangential stiffness and large normal stiffness was constructed.The finite element simulation model of the bionic sandwich structure with a polyester fiber laminate as its substrate under hail impact was established.Combinedly considering the mechanical properties of hail,the effectiveness of the hail impact model was verified.The effects of hail velocity and diameter on the dynamic mechanical responses and failure modes of the leaf epidermis cell wall bionic sandwich structure were analyzed.The results show that under the action of hail,the bio-ITCLC core and the upper panel are connected to cracks first,and then the upper panel produces matrix cracks and fiber fractures.The continuous action of the hail load causes the core to buckle until it collapses.The failure mode of the bio-ITCLC bionic structure was not changed with the increase of hail impact velocity and diameter,but the force on the bio-ITCLC bionic sandwich structure increases linearly with the increase of hail diameter and presents a parabolic growth with the increase of hail impact velocity.

关 键 词：bio-ITCLC仿生结构 冰雹 动力响应 撞击 失效模式 

分 类 号：O344.3[理学—固体力学] O313.4[理学—力学]