冲击倾角下三星型-沙漏型内凹六边形复合微结构面内冲击动力学性能  

In-plane impact dynamic performance of tristar-funnel re-entrant hexagons composite cellular structure under inclined load

作　　者：赵颖 王凯锋 施劲余 桑叶 马芳武[2] 李云伍[1] Zhao Ying;Wang Kaifeng;Shi Jinyu;Sang Ye;Ma Fangwu;Li Yunwu(College of Engineering and Technology,Southwest University,Chongqing 400715,China;State Key Lab of Automobile Simulation and Control,Jilin University,Changchun 130022,China)

机构地区：[1]西南大学工程技术学院,重庆400715 [2]吉林大学汽车仿真与控制国家重点实验室,吉林长春130022

出　　处：《南京理工大学学报》2021年第2期237-244,共8页Journal of Nanjing University of Science and Technology

基　　金：重庆市自然科学基金面上项目(cstc2020jcyj-msxmX0996)。

摘　　要：倾斜荷载下的汽车碰撞事故时常发生,对多胞材料的力学响应会产生影响。该文以三星型-沙漏型内凹六边形复合微结构为研究对象,采用Hypermesh和Lsdyna联合仿真分析方法分析了冲击倾角(0~10°)和冲击速度(8~40 m/s)对该三星型-沙漏型内凹六边形面内冲击的变形模式和动力响应的影响,分别得到该微结构的变形模式、应力-应变曲线、平台应力和吸能特性曲线。结果表明,该微结构拥有两组弹性区与平台区,其压缩变形呈现不对称性,该特点随着冲击倾角的增大而更显著。此外,平台应力和吸能量随冲击速度的增大而增强,随冲击倾角的增大而降低。该文所提出的三星型-沙漏型内凹六边形复合微结构对汽车吸能构件的设计具有重要的指导意义。Traffic accidents cannot be avoided under inclined loading conditions,which strongly affects the mechanical responses of cellular material.In the paper,a novel tristar-funnel re-entrant hexagon composite cellular structure is taken as a research object.With the adoption of Hypermesh-Lsdyna simulation analysis method,deformation modes and dynamic responses of the composite structure undergoing non-ideal oblique impact loadings are investigated in consideration of the load angle(ranging from 0°to 10°)and impact velocity(ranging from 8m/s to 40 m/s).Moreover,the deformation modes,stress-strain curves,platform stress curves and energy absorption curves of this cellular structure are obtained.The results indicate that the cellular structure is possessed with two groups of elastic zones and plateau zones,and its asymmetric compression deformation becomes more obvious with the increase of impact angle.In addition,the platform stress and energy absorption will enhance with the increment of impact velocity,and decrease with the increase of impact angle.The novel tristar-funnel re-entrant hexagonal composite cellular structure proposed herein can provide more valuable guidelines for the design in vehicle energy absorbers.

关 键 词：倾斜荷载 三星型-沙漏型 内凹六边形 复合微结构 微结构材料 面内冲击 平台应力 能量吸收 

分 类 号：U465.9[一般工业技术—材料科学与工程]