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Mechanical and shape-memory properties of TPMS with hybrid configurations and materials

International Journal of Smart and Nano Materials 2024年第4期15卷 786-810页

作者： Tianzhen Liu Wei Zhao Yongtao Yao Cheng Lin Hanxing Zhao Jianguo Cai Key Laboratory of C&PC Structures of Ministry of Education National Prestress Engineering Research CenterSoutheast UniversityNanjingChina Department of Astronautical Science and Mechanics Harbin Institute of TechnologyHarbinChina National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina

Triply periodic minimal surface(TPMS)structures with excellent properties of stable energy absorption,light weight,and high specific strength could potentially spark immense interest for novel and programmable functions by combining smart materials,*** memory polymers(SMPs).This work proposes TPMS lattices with hybrid configurations and materials that are composed of viscoelastic and shape-memory materials with the aim to bring temperature-dependent mechanical properties and additional dissipation *** configurations and diverse materials of polylactic acid(PLA),fiber-reinforced PLA,and polydimethylsiloxane(PDMS)are induced,generating five types of TPMS lattices,including(Schoen’s I-WP)IWP uniform lattice,IWP lattice with density gradient,hybrid configurations,hybrid materials,and filled PDMS,which are fabricated by 3D *** fracture morphologies and the distribution of carbon fibers are demonstrated via scanning electron microscopy with a focus on the influence of carbon fiber on shape-memory and mechanical *** recovery tests are conducted,which proves good shape memory properties and reusable capability of TPMS *** combined methods of experiments and numerical simulation are adopted to evaluate mechanical properties,which presents multi-stage energy absorption ability and tunable vibration isolation performances associated with temperature and hybridization *** work can promote extensive research and provide substantial opportunities for TPMS lattices in the development of functional applications.

关键词： Triply periodic minimal surface shape memory property hybridization multi-stage energy absorption

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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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MWCNT Doped Reverse-Mode Polymer Network Liquid Crystals with Frequency Response Property

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Chinese Physics Letters 2024年第3期41卷 161-170页

作者：李佳峻姬栋超张智博杨亚楠张锐聪王天宇张宇民曹文鑫朱嘉琦 National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhou 450000China School of Energy Science&Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials and Key Laboratory of Cluster Science of Ministry of Education School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China

Polymer-liquid crystals(PLCs)are common materials for smart ***,PLC smart windows usually require high driving voltage to maintain *** synthesized a novel PLC smart film by doping multi-wall carbon nanotubes(MWCNTs)in... 详细信息

关键词： smart transparency maintain

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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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Recent advances in MXene for terahertz applications

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Optoelectronics Letters 2024年第5期20卷 272-288页

作者： ZHANG Yongzhi JIANG Jiuxing YAO Yongtao HE Xunjun Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080China College of Science Harbin University of Science and TechnologyHarbin 150080China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin University of Science and TechnologyHarbin 150080China

Since first synthesized in 2011, MXenes have attracted extensive attention in many scientific fields as a new two-dimensional(2D) material because of the unique physical and chemical properties. Over the past decade, in particular, MXenes have obtained numerous exciting achievements in the field of terahertz applications. In this review, we first briefly introduce the MXene materials, such as the basic structure and main fabrication processes of MXenes. Then, we summarize the recent applications of MXene materials in various terahertz research areas, including terahertz modulation, terahertz absorption, terahertz shielding, terahertz communication, terahertz detection and terahertz generation, in which the representative results are presented. Finally, we give an outlook on the future research directions of MXene materials and their potential applications.

关键词： terahertz directions absorption

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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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Spinodal dynamics of metastable glass transition domains in amorphous polymer towards thermomechanically tailorable shape memory effect

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science China(Technological sciences) 2023年第8期66卷 2432-2440页

作者： LIU JingYun LU HaiBao FU Yong-Qing Science and Technology on Advanced Composites in Special Environments Laboratory Harbin Institute of TechnologyHarbin 150080China Faculty of Engineering and Environment Northumbria UniversityNewcastle upon TyneNE18STUK

Glass transition plays a critical role to determine the dynamic behaviors of amorphous shape memory polymers(SMPs).However,the fundamental relationships between shape memory effect(SME)and dynamic glass transition have not been well understood,even though this topic has been studied for *** this study,we apply a mean-square displacement function of Adam-Gibbs(AG)domain size model to explore metastable glass transition between normal glass state and rubbery state of amorphous SMPs,based on both mode-coupling theory and mean-field model.A statistic viscosity equation is formulated to study the dynamic glass transition of metastable AG domains in an amorphous SMP.A dynamically spinodal model is also developed to connect dynamic glass transitions to thermomechanical processes,based on statistic viscosity equation and phase transition ***,using the spinodal models,multiple shape memory behaviors have been predicted for amorphous SMPs with dual-,triple-and quadruple-SMEs,resulted from their different routes of themomechanical ***,the proposed models are verified using the experimental data reported in literature.

关键词： shape memory polymer glass transition dynamics metastable

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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 tree-growing graphic model for asymmetrical phantom networks in polymeric gels undergoing dynamic mechanochemical coupling

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science China(Technological sciences) 2024年第2期67卷 558-567页

作者： SHI WeiLin ZHOU Jian LU HaiBao ELMARAKBI Ahmed FU Yong-Qing National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China Faculty of Engineering and Environment University of NorthumbriaNewcastle upon Tyne NEI 8STUK

Network structures of various polymers have significant effects on their mechanical properties;therefore,numerous studies have investigated the constitutive relationship between symmetrical network structures and their rubber elasticity in ***,few studies have focused on asymmetrical network structures in polymers that undergo bond exchange reactions,selfassembly,or mechanochemical coupling—all of which are induced by transition probabilities of chemical bonding *** this study,an extended constraint junction and phantom network model is formulated using the tree-growing theory to establish a constitutive relationship between asymmetrical network structures and their rubber elasticity in polymers.A free-energy equation is further developed to explore working principles of configurational transitions on the dynamic rubber elasticity of symmetrical and asymmetrical network *** constitutive relationship between dynamic rubber elasticity and symmetrical and asymmetrical network structures has also been proposed for the gels undergoing mechanochemical and hydromechanical ***,the effectiveness of this newly proposed tree-growing model has been verified by comparing with the classical affine network model,finite element analysis,and the experimental results of gels reported in literature.

关键词： gel polymer network rubber elasticity asymmetric

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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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