分级梯度蜂窝结构的面内压溃行为
In-plane crushing behavior of hierarchical-gradient honeycomb structure
查曙光 1王士龙 1裴文杰 1黄志来2
作者信息
- 1. 安徽工业大学 建筑工程学院,安徽 马鞍山 243002
- 2. 安徽工业大学 机械工程学院,安徽 马鞍山 243002
- 折叠
摘要
通过逐层在六边形胞元中引入次级结构的方式构建了4 种具有分级梯度特性的蜂窝结构,采用ABAQUS/Explicit有限元软件对 4 种分级梯度构型蜂窝结构的面内压溃性能进行了数值模拟.结果表明,分级梯度的引入能够有效控制蜂窝结构准静态加载下变形带的产生和发展,使得不同分级阶数胞元的压溃失效进程以不同的平台应力水平反映在分级梯度蜂窝结构的宏观力学响应中.结合细观变形机制,分析了冲击速度和胞壁厚度对分级梯度蜂窝结构压溃响应和能量吸收性能的影响规律.在低速冲击下,采用中间高阶两端低阶胞元布置的对称分级梯度蜂窝结构表现出优异的吸能性能,与传统蜂窝结构相比,比吸能提高了 95.66%.在高速冲击下,不同分级胞元的梯度设计能够改善蜂窝结构在压溃过程中的吸能性能,使得吸能结构的压溃过程能够得到有效调控.
Abstract
Four kinds of honeycomb structures with hierarchical-gradient characteristics were developed by introducing secondary struc-tures into hexagonal cells layer by layer.The numerical simulation of the in-plane crushing performance of four kinds of honeycomb struc-tures with hierarchical-gradient configuration was conducted using ABAQUS/Explicit finite element software.The results show that the in-troduction of hierarchical-gradient can effectively control the formation and development of deformation bands in honeycomb structures un-der quasi-static loading,which results that the crushing failure processes of cells with different hierarchical orders manifest in the macro-scopic mechanical response of the hierarchical-gradient honeycomb structures with different platform stress levels.Combining with the me-so deformation mechanism,the influence laws of impact velocity and cell wall thickness on the crushing response and energy absorption performance of hierarchical-gradient honeycomb structures were analyzed.Under low velocity impact,the symmetric hierarchical-gradient honeycomb structure with high order in middle and low order in both ends cell arrangement exhibits excellent energy absorption perform-ance,and the specific energy absorption is increased by 95.66%compared with that of traditional honeycomb structure.Under high veloc-ity impact,the gradient design of different hierarchical cells can improve the energy absorption performance of honeycomb structure,which makes the crushing process of energy-absorbing structure be effectively regulated.
关键词
分级梯度/蜂窝结构/面内压溃/变形模式/能量吸收Key words
hierarchical-gradient/honeycomb structure/in-plane crushing/deformation pattern/energy absorption引用本文复制引用
基金项目
国家自然科学基金资助项目(11802002)
出版年
2024
NETL
NSTL
万方数据