摘要
根据仿生学骨骼,通过改变六边形蜂窝壁角的方法来达到变化六边形蜂窝构型的目的。建立了串联梯度蜂窝结构的设计模型和有限元模型,设计了线性串联梯度理论,并从变形模式、平台应力和吸能性3方面在同体积不同压缩速度条件下分析了串联梯度蜂窝与均匀蜂窝的准静态及动态面内压缩过程,并分析了力学响应。研究结果表明:通过改变梯度率λ可以改变串联梯度蜂窝变形模式,当梯度率λ=-0.0088时,在等效应变前期,平台应力低速动态强化效果较为显著,但是并没有明显达到改善比吸能的效果。
Based on the bionic skeleton,the hexagon honeycomb structure was changed by changing the angle of hexagonal honeycomb wall.The design model and the finite element model of tandem gradient honeycomb(TGH)structures were established and the linear tandem gradient theory was designed,and the quasi static and dynamic in-plane compression process,as well as the mechanical response of tandem gradient honeycomb and homogeneous honeycomb were analyzed under the conditions of same volume and different compression speeds from three aspects,namely deformation mode,nominal stress and energy absorption.The research results show that the deformation mode of tandem gradient honeycomb can be changed by changing the gradient rate λ.The low-speed dynamic strengthening effect of mominal stress in the early equivalent strain stage when gradient rate λ=-0.0088,but the specific energy absorption is not improved obviously.
作者
乔及森
李明
苗红丽
QIAO Ji-sen;LI Ming;MIAO Hong-li(College of Materials Science and Technology,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2021年第11期115-123,共9页
Journal of Plasticity Engineering
基金
沈阳材料科学国家研究中心-有色金属加工与再利用国家重点实验室联合基金培育项目(18LHPY007)。
关键词
线性串联梯度
蜂窝结构
面内性能
有限元分析
linear tandem gradient
honeycomb structure
in-plane performance
finite element analysis
