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  

Effects of hail shape and repeated impacts on damage of bionicstructure of leaf epidermal cell wall

作　　者：王海文 徐丹 陈墨林 叶仁传 任鹏[1] WANG Haiwen;XU Dan;CHEN Molin;YE Renchuan;REN Peng(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》2024年第3期227-232,240,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(52001145)。

摘　　要：为了提高纤维轻量化构件的冰雹载荷防护性能,基于高垂直刚度特性的叶表皮细胞壁仿生结构(a biomimetic isosceles trapezoid corrugated lattice cellular, bio-ITCLC),构建基体为涤纶纤维层合材料的仿生夹层结构数值模型,分析了冰雹形状、速度及重复撞击对叶表皮细胞壁仿生夹层结构力学行为及动态损伤的影响。结果表明:撞击接触力随冰雹形状的变化而改变,在相同撞击速度条件下,接触力峰值、初始上升率均随冰雹接触面的增大而提高,但加载时间减小;柱形及锥形冰雹的接触力峰值随撞击速度的增大而线性增长,半球形冰雹的接触力峰值与撞击速度呈抛物线关系。bio-ITCLC仿生夹层结构在柱形、半球形和锥形冰雹下的损伤模式分别为撞击区域屈曲压溃而引起纤维断裂、压痕导致的纤维断裂及基体开裂、仿生芯层与上层面板的分层失效。重复撞击并不改变仿生结构的失效模式,但bio-ITCLC仿生夹层结构的基体分层及累积损伤范围随冰雹重复撞击次数的增加而显著增大。Here,to improve protection performance against hail load of fiber-lightweight components,a bionic structure based on high vertical stiffness characteristics of leaf epidermal cell wall called bio-ITCLC(a biomimetic isosceles trapezoid corrugated lattice cellular)was constructed.Numerical model of biomimetic sandwich structure with polyester fiber composite material taken as matrix was constructed to analyze effects of hail shape,hail velocity and repeated impacts on mechanical behavior and dynamic damage of biomimetic sandwich structure of leaf epidermal cell wall.The results showed that impact contact force changes with variation of hail shape,under the same impact velocity conditions,peak value and initial rise rate of contact force increase with increase in hail contact surface,but loading time decreases;contact force peak values of cylindrical and conical hails increase linearly with increase in impact velocity,while contact force peak value of hemispherical hail has a parabolic relation with impact velocity;damage modes of bio-ITCLC bionic sandwich structure under cylindrical,hemispherical and conical hails are fiber fracture caused by buckling and crushing in impact area,fiber fracture and matrix cracking caused by indentation and delamination failure of bionic core layer and upper panel,respectively;repeated impacts do not alter failure modes of bionic structures,but matrix delamination and cumulative damage range of bio-ITCLC bionic sandwich structures significantly increase with increase in hail repeated impacts.

关 键 词：叶表皮细胞壁仿生结构(bio-ITCLC) 冰雹形状 重复撞击 损伤模式 

分 类 号：O344.3[理学—固体力学]