CFRP-Al混合立柱轴压吸能关键参数及影响规律
Crucial parameters and influence rules of axial crushing energy absorption of CFRP-A1 hybrid columns
牟浩蕾 1陈英实 2赵祎明 2解江 1冯振宇1
作者信息
- 1. 中国民航大学 科技创新研究院,天津 300300
- 2. 中国民航大学 安全科学与工程学院,天津 300300
- 折叠
摘要
为了研究碳纤维增强树脂(Carbon fiber reinforced polymer,CFRP)-铝合金(Aluminium alloy,Al)开剖面混合立柱结构在轴向载荷下的失效行为及能量吸收特性,通过准静态轴向压缩试验与有限元仿真相结合的方法,分析了不同关键参数对CFRP-A1混合立柱轴压失效行为和能量特性的影响规律.结果表明:铝合金单层壳模型采用基于弹塑性本构与GISSMO损伤模型,CFRP层合壳模型采用Chang-Chang层内失效准则与基于B-K层间损伤模型,能够精确模拟CFRP-A1混合立柱轴压失效行为及吸能特性.通过对相对厚度比例、圆角率、开合角度、梯度和诱导孔等关键参数分析,在相对厚度比例系数η=67％,圆角半径y=50％,开合角度θ=120°,梯度T=8,诱导孔K=1时,CFRP-A1混合立柱比吸能达到较高水平.通过对关键参数最优值进行耦合,CFRP-A1混合立柱的轴压吸收能量提升了 46.81％,比吸能提升了 49.06％.
Abstract
To investigate the failure behavior and energy absorption characteristics of carbon fiber reinforced poly-mer(CFRP)-aluminum alloy(Al)open-section hybrid columns under axial load,the combination of quasi-static crushing test and finite element method were employed to analyze the effects of different crucial parameters on axial crushing failure behavior and energy absorption characteristics of CFRP-A1 hybrid columns.The results show that the Al model with single-layer shell adopted the elastic-plastic constitutive and GISSMO damage model,as well as the CFRP model with laminated shell adopted the Chang-Chang intralaminar failure criterion and the B-K interlaminar damage model can accurately simulate the axial crushing failure behavior and energy absorption char-acteristics of CFRP-A1 hybrid columns.Through the analysis of crucial parameters such as relative thickness ratio,fillet ratio,opening angle,gradient and induced hole,the specific energy absorption of CFRP-A1 hybrid columns reaches a higher level with the relative thickness ratio η=67％,fillet ratio y=50％,opening angle θ=120°,gradient T=8,and induced hole K=l.By coupling the optimal values of the crucial parameters,the axial crushing energy absorption of the CFRP-A1 hybrid column increases by 46.81％,and the specific energy absorption increases by 49.06％.
关键词
CFRP-Al混合立柱/轴压试验/数值模拟/失效行为/吸能特性Key words
CFRP-Al hybrid columns/axial crushing test/numerical simulation/failure behavior/energy absorp-tion characteristics引用本文复制引用
基金项目
国家重点研发计划项目(2022YFB4301000)
天津市应用基础研究多元投入基金项目(21JCYBJC00690)
天津市应用基础研究多元投入基金项目(23JCYBJC00070)
中国民航大学波音基金项目(20240101)
出版年
2024
NETL
NSTL
万方数据