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Frequency reconfigurable antenna actuated by inflated triangular structure:Design and analysis

Chinese Journal of Aeronautics 2023年第5期36卷 280-285页

作者： Jiaming GUO Xinghan QIU Jiawei ZHANG Lamei ZHANG Changguo WANG School of Astronautics Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin 150001China School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China

This paper proposes a frequency reconfigurable triangular antenna actuated by an inflated triangular *** open path antenna is transformed from an open type to a closed structure by *** structures are easy to manufacture by fusing 2 inextensible membranes together along a defined pattern of ***,the prediction of their deployed shape remains a *** solve the pattern changed problem,guided by geometric analyses and local buckle characteristics,the inflated triangular structure has been designed and verified by experiment and *** the process of transformation of the antenna,the resonant frequency of the antenna is changed because this frequency is determined by the conformational *** resonant frequency changes from GHz to kHz when the design of initial structure sizes is from millimeter to *** measured peak gains,the frequency,and the radiation direction are also reconfigurable by the initial ***,the reconfigurable resonator array is presented,which is coupled to electric fields to absorb all incident *** this work,the changed pattern design by inflating is applied to the antenna design,and its frequency reconfigurability is *** the electricity performance analysis of the reconfigurable antenna,precise manufacturing will be possible and provide guidance for manufacturing frequency reconfigurable antennas.

关键词： Free kink design Frequency Reconfigurable Antenna(FRA) Inflated Return losses Thin film

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Void formation and distribution during CFRP curing process 21

Void formation and distribution during CFRP curing process

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21st International Conference on composite Materials, ICCM 2017

作者： Chen, Dongkangkang Zhang, Yumin Zhou, Yufeng Science and Technology on Advanced Composites in Special Environments Laboratory Harbin Institute of Technology Harbin150001 China

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New advances in fiber-reinforced composite honeycomb materials

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science China(Technological sciences) 2020年第8期63卷 1348-1370页

作者： WEI XingYu XIONG Jian WANG Jie XU Wu Center for Composite Materials and Structures Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Shanghai Aircraft Design and Research Institute Shanghai 201210China School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China

In sandwich structures,lightweight cellular materials as the core hold the face sheets far away from the neutral axis to maximize the bending performance of the *** materials as a major type of lightweight cellular materials have been widely applied in various fields,including aerospace,vehicle,marine,architecture and mechanical engineering,due to reliable mechanical properties and excellent *** fiber-reinforced composites is an efficient method to develop ultralight honeycomb materials with superior mechanical *** recent years,fiber-reinforced composite honeycomb materials possessing lightweight and excellent mechanical performances have attracted noticeable attention to replacing traditional aluminum honeycombs and Nomex *** to metal,polymer and Nomex paper,fiber-reinforced composites possess various merits,such as high specific stiffness and specific strength,excellent fatigue property,corrosion resistance and high-temperature ***,the applications of fiber-reinforced honeycomb material for sandwich core have unlimited potential in hypersonic vehicles,long-range rockets,cargo vessels and protective *** the fact that attention has been rapidly increasing,there is a lack of comprehensive reviews of new advances in the field of fiber-reinforced composite honeycomb *** this review,new advances reported by different scientists in the field of fiber-reinforced honeycomb materials have been reviewed and analyzed to provide an in-depth overview and knowledge for beginners in the field of ultralightweight and high-performance composite sandwich *** challenges and prospects for the development of fiberreinforced honeycomb materials have also been presented.

关键词： composite honeycomb materials sandwich structures failure mechanism mechanical property

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High Temperature Mechanical Properties of Carbon/Phenolic composite at High Heating Rate 23

High Temperature Mechanical Properties of Carbon/Phenolic Co...

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23rd International Conference on composite Materials, ICCM 2023

作者： Lin, X. Xie, W. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin China

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A surfactant-modified composite separator for high safe lithium ion battery

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Journal of Energy Chemistry 2023年第1期76卷 398-403,I0010页

作者： Botao Yuan Niandong He Yifang Liang Liwei Dong Jipeng Liu Jiecai Han Weidong He Yuanpeng Liu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080HeilongjiangChina MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150080HeilongjiangChina Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China

Separators have been gaining increasing attention to improve the performance of lithium ion batteries(LIBs),especially for high safe and long cycle ***,commercial polyolefin separators still face the problems of rapid capacity decay and safety issues due to the poor wettability with electrolytes and low thermal ***,a novel composite separator is proposed by introducing a surfactant of sodium dodecyl thiosulfate(SDS)into the polytetrafluoroethylene(PTFE)substrate with the binder of polyacrylic acid(PAA)through the suction filtration *** introduction of PAA/SDS enhances the adsorption energy between PTFE substrate and electrolyte through density functional theory calculations,which improves wettability and electrolyte uptake of the separator *** asachieved composite separator enables the LIBs to own high Li^(+)conductivity(0.64×10^(-3)S cm^(-1))and Li^(+)transference number(0.63),further leading to a high capacity retention of 93.50%after 500 cycles at 1 *** addition,the uniform and smooth surface morphology of Li metal employed the composite separator after cycling indicates that the lithium dendrites can be successfully *** work indicates a promising route for the preparation of a novel composite separator for high safe LIBs.

关键词： composite separator PTFE Surfactant High safe Lithium ion batteries

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INVESTIGATION OF PYROLYSIS CHARACTERISTICS OF SILICONE-PHENOLIC MATRIX NANOcompositeS THROUGH KINETIC ANALYSIS AND REAXFF MD SIMULATIONS 23

INVESTIGATION OF PYROLYSIS CHARACTERISTICS OF SILICONE-PHENO...

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23rd International Conference on composite Materials, ICCM 2023

作者： Xiao, Jie Fang, Guodong Wang, Bing Hong, Changqing Meng, Songhe National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin China

The pyrolysis characteristics of the polymeric nanocomposites are dominantly governed by the pyrolyzable components to accommodate a specific thermodynamic environment. The pyrolysis behaviour of the pyrolyzable system including silicone and phenolic aerogels (SiOC/PR) of silicone-modified phenolic aerogel matrix nanocomposites was investigated by TG and TG-FTIR, which shows that a mass ratio of PR to SiOC of 3:1 exhibits better thermal stability. The distributed activation energy model (DAEM) was employed to investigate the decomposition kinetics, and the results show that the five-pseudo-components DAEM effectively represents the decomposition conversion signature of SiOC/PR. Methanol, the major volatile product affecting the thermal decomposition of the SiOC/PR system, was analysed at an atomic scale by ReaxFF molecular dynamics (MD) simulations for its reaction pathways. The MD results show that there are two main pathways for the production of methanol, which are extraction reactions of methyl intermediates and hydroxymethyl intermediates, respectively. The Si-O-Si backbone of SiOC can bridge the PR fragments at elevated temperatures, which impacts the yield of condensed residues. Based on TG experimental data, the dependence of weight loss on temperature for SiOC/PR systems with different mixture ratios was predicted by artificial neural networks (ANN). The ANN with a 20*3*1 topology exhibits promising prediction performance. Our work aims to provide practical guidance for engineers to optimize process procedures with a better knowledge of the features of chemical systems. © 2023 International Committee on composite Materials. All rights reserved.

关键词： Aerogels

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Multiscale failure analysis of 3d braided composite structure by coupling FEM and FFT method 22

Multiscale failure analysis of 3d braided composite structur...

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22nd International Conference on composite Materials, ICCM 2019

作者： Fang, Guodong Wang, Bing Science and Technology on Advanced Composites in Special Environments Key Laboratory Harbin Institute of Technology Harbin150001 China

The progressive damage behavior of three dimensional (3D) braided composite beam is studied by using a more efficient multiscale coupling method including fast Fourier transformation (FFT)-based method and finite element (FE) method. FFT-based method with variational principle is used to overcome the poor convergence for composites with large jumps of material properties in mesoscale. The mechanical response of the braided composites is studied using finite element (FE) method in the macro-scale. The predicted strength and dominated failure modes of the braided composites structure obtained by the proposed method are in good agreement with the experimental results. The high computation efficiency is attractive for large structure with the nonlinear mechanical behavior. © 2019 International Committee on composite Materials. All rights reserved.

关键词： Fast Fourier transforms

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Bismuth Oxide Selenium/Graphene Oxide composites:Toward High-Performance Electrodes for Aqueous Alkaline Battery

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Energy & Environmental Materials 2021年第3期4卷 465-473页

作者： Yi-Lin Liu Meng-Qiu Li Gui-Gen Wang Le-Yang Dang Fei Li Mei Er Pam Hua-Yu Zhang Jie-Cai Han Hui Ying Yang Shenzhen Key Laboratory for Advanced Materials Harbin Institute of TechnologyShenzhenShenzhen 518055China Pillar of Engineering Product Development Singapore University of Technology and Design8 Somapah RoadSingapore City 487372Singapore National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China

Aqueous alkaline battery represents a promising energy storage technology with both high energy density and high power density as rechargeable ***,the low theoretical capacities,kinetics and stability of anode materials have limited their developments and *** this study,we propose a novel method to produce two-dimensional layered bismuth oxide selenium(Bi_(2)O_(2)Se)and reduced graphene oxide(r GO)composites via a one-step hydrothermal *** volume change caused by phase change during rapid charging and discharging is significantly reduced and the capacity reaches 263.83 m Ah g^(-1)at a current density of 0.5 A g^(-1).The Bi_(2)O_(2)Se/r GO electrode exhibits excellent cycling stability in which the capacity retention rate is 81.04%after 5000 *** importantly,the Bi_(2)O_(2)Se/r GO nanosheet composite is used as the anode electrode material with MnCo_(2)O_(4.5)@Ni(OH)_(2)as the cathode electrode material in aqueous alkaline *** the energy density is 76.16 W h kg^(-1),the power density reaches 308.65 W kg^(-1).At a power density of 10.21 k W kg^(-1),the energy density remains as high as 33.86 W h kg^(-1).The results presented here may advance the understanding of the issues facing the development of aqueous battery anode materials.

关键词： anode materials aqueous alkaline battery Bi_(2)O_(2)Se nanosheet reduced graphene oxide

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Analytical and experimental study on high-temperature high-velocity impact limit for C/C composite 22

Analytical and experimental study on high-temperature high-v...

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22nd International Conference on composite Materials, ICCM 2019

作者： Weihua, Xie Fan, Yang Shuo, Han Songhe, Meng National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin China

Explosively formed debris at low earth orbit is one of the most severe hypervelocity impact loading threats to space shuttle. The collision induced crack or perforation would lead to an unzipping of the thermal protection system (TPS) of the impacted shuttle when the impact occurs in their re-entry stage. So far, SiC coated C/C composite (RCC as abbreviated) as a candidate material for TPS have not been studied sufficiently on their mechanical protection performance. The hypervelocity impact characteristics of RCC at temperatures of 25°C to 1400°C were analysed and discussed in this paper. The experimental test programs were implemented with a converted light gas gun system and results were presented with various impact factors being considered. Furthermore, corresponding simulations were carried out and the morphologies of perforated holes from numerical results were consistent with those observed from tests results. Additionally, a semi-empirical and semi-analytical model was developed and successfully used for predicting the residual velocity and trajectory of the projectiles during the impact. Eventually, comparisons of the ballistic impact response predictions with the experimental results were presented and discussed. © 2019 International Committee on composite Materials. All rights reserved.

关键词： Space shuttles

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The compatibility of polylactic acid and polybutylene succinate blends by molecular and mesoscopic dynamics

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International Journal of Smart and Nano Materials 2020年第1期11卷 24-37页

作者： Cheng Lin Liwu Liu Yanju Liu Jinsong Leng Department of Astronautic Science and Mechanics Harbin Institute of Technology(HIT)HarbinPeople’s Republic of China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology(HIT)HarbinPeople’s Republic of China

The compatibility of polylactic acid(PLA)/polybutylene succinate(PBS)blends was studied by molecular dynamics and mesoscopic dynamics,which is a controversial issue in *** simulation models of PLA/PBS with different composition ratios(100/0,90/10,80/20,70/30,60/40,0/100)were *** radial distribution function,hydrogen bond,free energy density,order parameter and iso-density surface morphology of the PLA/PBS systems were simulated and *** to the formation of hydrogen bonds and van der Waals bonds between different elements of PLA chains and PBS chains,the PLA/PBS blends exhibit good compatibility at all composition ratios.

关键词： Compatibility molecular dynamics simulation radial distribution function PLA PBS

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