摘要
点阵夹芯结构因其优异的力学性能、出色的能量吸收能力、独特的功能性,被广泛应用于航空航天、汽车、船舶等领域。然而,传统点阵夹芯结构在面外压缩载荷下存在应力分布不均匀、节点应力集中等缺点。为了解决上述问题,该研究基于体心立方结构(body-centered cubic,BCC)提出了一种新型的余弦函数单元基(cosine function cell-base,CFCB)点阵结构。为了研究CFCB点阵夹芯结构面外压缩载荷下能量吸收特性,制备了CFCB点阵夹芯结构,开展了准静态压溃试验,并与BCC点阵夹芯结构的试验结果进行对比。结果表明,CFCB点阵夹芯结构面外压缩载荷下的承载与能量吸收能力明显优于BCC点阵夹芯结构。随后,基于有限元模型,系统揭示了芯子单胞直径、幅值、周期长度等胞元参数及厚度方向上的单胞层数对CFCB点阵夹芯结构面外压缩载荷下吸能特性的影响。相关研究成果有望为新型CFCB点阵夹芯结构设计提供参考。
Lattice sandwich structures are widely used in fields of aerospace,automotive and shipbuilding due to their excellent mechanical properties,excellent energy absorption ability and unique functionality.However,traditional lattice sandwich structures have drawbacks of uneven stress distribution and node stress concentration under out of plane compressive load.Here,aiming at above issues,a novel cosine function cell-base(CFCB)lattice structure was proposed based on body centered cubic(BCC)structure.In order to study energy absorption characteristics of CFCB lattice sandwich structures under out of plane compressive load,a CFCB lattice sandwich structure was prepared,quasi-static crushing tests were conducted for it,and the test results were compared with those of BCC lattice sandwich structure.The results showed that load-bearing and energy absorption abilities of CFCB lattice sandwich structure under out of plane compressive load are obviously better than those of BCC lattice sandwich structure.Furthermore,using finite element analysis,effects of cell parameters including core cell diameter,amplitude,period length,and number of cell layers in the thickness direction on energy absorption characteristics of CFCB lattice sandwich structures under out of plane compression load were systematically revealed.The relevant study results were expected to provide a reference for design of new type CFCB lattice sandwich structures.
作者
赵众豪
池瑜莉
冯峻良
文大伟
朱国华
ZHAO Zhonghao;CHI Yuli;FENG Junliang;WEN Dawei;ZHU Guohua(College of Automobile,Chang’an University,Xi’an 710064,China;College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410006,China;College of Chang’an-Dublin International Transportation,Chang’an University,Xi’an 710064,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2023年第17期166-174,共9页
Journal of Vibration and Shock
基金
国家重点研发计划(2021YFB2501705)
国家自然科学基金(51905042)
长安大学中央高校基础研究基金(300102221201)。
关键词
点阵夹芯结构
增材制造
能量吸收特性
有限元分析
lattice sandwich structure
additive manufacturing
energy absorption characteristics
FE analysis
