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Design,fabrication,and dynamic mechanical responses of fiber-reinforced composite lattice materials

International Journal of Mechanical System Dynamics 2023年第3期3卷 213-228页

作者： Jian Xiong Cheng Gong Qianqian Wu Li Ma Jinshui Yang Linzhi Wu Center for Composite Materials and Structures Harbin Institute of TechnologyHarbinChina National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina

Fiber-reinforced composites are a popular lightweight materials used in a variety of engineering applications,such as aerospace,architecture,automotive,and marine construction,due to their attractive mechanical *** lattice materials from fiber-reinforced composites is an efficient approach for developing ultra-lightweight structural systems with superior mechanical proper-ties and multifunctional *** contrast to corrugated,foam,and honeycomb core materials,composite lattice materials can be manufactured with various architectural designs,such as woven,grid,and truss ***,lattice materials with open-cell topology provide multifunctional advantages over conventional closed-cell honeycomb and foam structures and are thus highly desirable for developing aerospace systems,hypersonic vehicles,long-range rockets and missiles,ship and naval structures,and protective *** objective of this study is to review and analyze dynamic mechanical behavior performed by different researchers in the area of composite lattice materials and to highlight topics for future research.

关键词： fiber-reinforced composite lattice structures sandwich structures dynamic mechanical behavior

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Ultra-sensitive,highly linear,and hysteresis-free strain sensors enabled by gradient stiffness sliding strategy

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npj Flexible Electronics 2024年第1期8卷 817-824页

作者： Fuhua Xue Qingyu Peng Renjie Ding Pengyang Li Xu Zhao Haowen Zheng Liangliang Xu Zhigong Tang Xinxing Zhang Xiaodong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of Technology150080 HarbinChina State Key Laboratory of Polymer Materials Engineering Polymer Research InstituteSichuan University610065 ChengduChina

Developing strain sensors with both high sensitivity and high linearity has always been the goal of *** to resistive strain sensors,capacitive strain sensors have incomparable linearity advantages,but have always been limited by low ***,we report a gradient stiffness sliding design strategy that addresses this problem,significantly improving sensitivity while maintaining high *** controlling the distribution of the locally enhanced electric field and the heterogeneous deformation of the substrate,a strain sensor with excellent performance is successfully prepared,exhibiting a giant gauge factor(9.1×10^(6))and linearity(R^(2)=0.9997)over the entire sensing range,together with almost no hysteresis and fast response time(17 ms).The gradient stiffness sliding design is a general strategy expected to be applied to other types of sensors to achieve ultra-high sensitivity and ultra-high linearity at the same time.

关键词： stiffness strain gradient

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

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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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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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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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Ultrafast nanomanufacturing via high-temperature shock of La_(0.6)Sr_(0.4)CoO_(3)catalysts for overall water splitting

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Journal of Materials science & technology 2024年第24期191卷 1-7页

作者： Xiaoya Cui Wenyu Li Yanchang Liu Yumei Zhu Yanan Chen Cairong Gong Gang Xue School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin 300072China School of Materials Science and Engineering Institute of New EnergyTianjin UniversityTianjin 300072China Key Laboratory of Special Functional Materials for Ecological Environment and Information Ministry of EducationHebei University of TechnologyTianjin 300132China

Electrochemical water splitting,as an effective sustainable and eco-friendly energy conversion strategy,can produce high-purity hydrogen(H_(2))and oxygen(O_(2))via hydrogen evolution reaction(HER)and oxygen evolution reaction(OER),respectively,altering the nonrenewable fossil ***,La_(0.6)Sr_(0.4)CoO_(3)perovskite oxide nanoparticles with an orthorhombic phase were synthesized within 2 min in a one-step reaction,using a rapid and efficient high-temperature shock(HTS)***,the as-prepared La_(0.6)Sr_(0.4)CoO_(3)with orthorhombic phase(HTS-2)exhibited better OER and HER performance than the hexagonal phase counterpart prepared using the traditional muffle furnace calcination *** electrocatalytic performance enhancement of orthorhombic La_(0.6)Sr_(0.4)CoO_(3)can be attributed to the novel orthorhombic structure,such as confined strontium segregation,a higher percentage of highly oxidative oxygen species,and more active sites on the *** facile and rapid synthesis technique shows great potential for the rational design and crystal phase engineering of nanocatalysts.

关键词： Perovskite oxides High-temperature shock Water splitting High Gibbs free energy Phase engineering

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A Novel Hierarchically Lightweight Porous Carbon Derived from Egg White for Strong Microwave Absorption

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Engineering 2022年第11期18卷 161-172页

作者： Zonglin Liu Xu Zhao Liangliang Xu Qingyu Peng Xiaodong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructureHarbin Institute of TechnologyHarbin 150080China

Egg custard is a common dish on the dining table and exhibits a uniform porous structure after *** protein within egg custard is a rich source of carbon and nitrogen,and the custard’s unique microstructure and adjustable electrical properties make it a potential porous carbon ***,nitrogen in situ doped porous carbons(NPCs)and potassium-carbonate-modified NPCs(PNPCs)are obtained through a simple gelation and carbonization process using egg white as the raw *** unique morphologies of the porous carbon are inherited from the protein and include fibrous clusters,honeycomb holes,and a grooved *** excellent impedance matching and effective internal loss make the obtained porous carbons good candidates for lightweight electromagnetic(EM)wave absorbers without the need to dope with metal *** a representative porous carbon,PNPC10-700 has multiple structures,including fibrous clusters,honeycomb holes,and a porous ***,it achieves a maximum reflection loss value of-66.15 dB(with a thickness of 3.77 mm)and a broad effective absorption bandwidth of 5.82 GHz(from 12.18 to 18.00 GHz,with a thickness of 2.5mm),which surpasses the reported values in most of the literatu ***,gelation combined with the further carbonization of egg white(protein)is a new method for designing the morphology and EM properties of porous carbon absorbers.

关键词： Microwave absorption Porous carbon Biomass K2CO3

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A novel inflatable rings supported design and buoyancy-weight balance deformation analysis of stratosphere airships

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Chinese Journal of Aeronautics 2022年第1期35卷 340-347页

作者： Weinan GAO Ji ZHANG Teng MA Guochang LIN Yuanpeng LIU Changguo WANG Huifeng TAN Center for Composite Materials Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China

Owing to the unique advantages in flight altitude,dwelling time and wide coverage area,stratospheric airships provide permanent monitoring and surveillance for both civil and military *** we propose a semi-rigid stratosphere airship design with circumferential high-pressure inflatable rings and a longitudinal carbon fiber skeleton supported *** perform numerical simulations to analyze the deformation characteristics during the whole ascending and descending *** equivalent internal gradient pressure model of helium is established based on the capsule shape and buoyancy-weight equilibrium *** implicit dynamic method is used to deal with the large deformation of the airship capsule under a low negative pressure *** and load-bearing performance of the airship capsule,inflatable ring,skeleton,and suspension line are obtained under different working *** results show that the airship,supported with the inflatable rings and the suspension lines,effectively maintains the shape and ensures the stiffness during the ascending,dwelling,and descending stages,especially suffering from negative pressure.

关键词： Buoyancy-weight balance Large deformation Load-bearing performance Negative pressure Stratospheric airship

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Soft-template synthesis of hierarchically porous structured polydimethylsiloxane toward flexible capacitive pressure sensor

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science China(Technological sciences) 2023年第9期66卷 2696-2706页

作者： HE ShiXue WU Jian DUAN YanHao SU BenLong LIU ShouYao TENG Fei WANG YouShan School of Mechatronics Engineering Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150090China Center for Rubber Composite Materials and Structures Harbin Institute of TechnologyWeihai 264209China

Flexible pressure sensors play an important role in the field of monitoring, owing to their inherent safety and the fact that they are embedded at the material level. Capacitive pressure sensors have been proven to be quite versatile, with the ability to change the sensitivity and monitoring range by modifying the pore structure of the dielectric layer(elastic modulus). In this paper, capacitive pressure sensors are devised, comprising hierarchical porous polydimethylsiloxane. Due to the inherent hollow and hierarchical micropore structure, the capacitive pressure sensor allows operation at a wider pressure range(~1000 kPa) while maintaining sensitivity(6.33 MPa-1) in the range of 0–300 k Pa. Subsequently, the capacitance output model of the sensor is optimized, which provides an overall approximation of the experimental values for the sensor performance. Additionally, the signal response of the“break up the whole into parts”(by analysis of the whole sensor in parts) is simulated and outputted by the finite element analysis. The simplified analysis model provides a good understanding of the relationship between the local pressure and the signal response of the pressure sensor. For practical applications, seal monitoring and rubber wheel pressure array system are tested, and the proposed sensor shows sufficient potential for application in large deformation elastomer products.

关键词： hierarchically porous structured flexible pressure sensor capacitive response mechanism hydrogel/silicone rubber emulsion

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Flexible Molybdenum Disulfide/Carbon Nanotube Composite Films for Thermoelectric Applications

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Energy Material Advances 2024年第1期5卷 236-242页

作者： Qinglin Li Ping Li Yanke Li Saiyaer Sidike Yueling Xu Yuchen Wang Zhi Hu Mingming Guo Hanqi Zhang Yichuan Zhang School of Chemistry and Chemical Engineering Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function ManufacturingSouthwest UniversityChongqing 400715China Chongqing Copolyforce New Materials Co LtdChongqing 401332China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China

Earth-abundant molybdenum disulfide(MoS_(2))shows a high application potential in thermoelectric(TE)field owing to its high Seebeck ***,the main obstacle to achieve high TE performance for the MoS_(2)material is its poor electrical *** this work,the flexible MoS_(2)/single-walled carbon nanotube(SWCNT)films with enhanced TE performance were fabricated via hydrothermal reaction,solution mixing,and subsequent vacuum *** strong S-πinteraction and the energy filtering effect at the MoS_(2)/SWCNT interface produced an impressive power factor value of 107.99±4.98μW·m^(-1)·K^(-2)for the MoS_(2)/SWCNT composite *** addition,the TE performance had high stability on bending ***,at a temperature difference of 50 K,the assembled TE device of MoS_(2)/SWCNT films exhibited good output *** work provides a feasible reference to optimize the TE performance of MoS_(2)materials and demonstrates a high potential of flexible MoS_(2)-based composites in TE applications.

关键词： molybdenum disulfide mos shows electrical conductivityin thermoelectric performance moS carbon nanotube swcnt films flexible films energy filtering effect hydrothermal reactionsolution

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