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An alternating collinear tubular lattice material with enhanced energy absorption

International Journal of Solids and Structures 2025年 318卷

作者： Yu, Penghui Zhang, Peijie Ma, Haoxiang Chen, Xueyan Tan, Huifeng Kadic, Muamer National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology 92 Xidazhi Street Harbin150001 China Deep Sea Engineering Division Institute of Deep Sea Science and Engineering Chinese Academy of Sciences Hainan Sanya572000 China Université de Franche-Comté CNRS Institut FEMTO-ST Besançon25000 France

Tubular lattice materials have garnered significant attention for their exceptional bending and compressive properties. However, conventional simple cubic tubular lattice materials often exhibit premature failure due to the presence of hollow nodes within discontinuous tubes. To overcome this limitation, we propose a novel three-directional alternating collinear tubular lattice material featuring continuous tubes that eliminate hollow nodes. The mechanical performance of this design is investigated through theoretical analysis, numerical simulations, and experimental validation. At low relative densities, the deformation behavior is predominantly governed by the vertical continuous tubes, which contribute approximately 95% and 91% to the overall stiffness and strength of the lattice, respectively—representing enhancements of 2.3-fold and 1.6-fold compared to the conventional design. As the relative density increases, material overlap and tube coupling effects become significant, with horizontal tubes providing displacement restraint and buckling control for vertical tubes, thereby further enhancing structural performance. At high relative densities, the synergistic action of vertical and horizontal tubes results in stable plastic bending deformation within the ACT lattice. The proposed lattice achieves a normalized yield strength 29% higher than that of the stiffest smooth shell-like lattice structure at a relative density of 0.5, while also demonstrating superior specific energy absorption at a relative density of 0.3. These results underscore its potential for applications in load-bearing and energy absorption. © 2025

关键词： Light absorption

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Stretch-induced wrinkling and post-buckling bifurcation in rectangular films: insights into energy barrier mechanisms

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International Journal of Mechanical sciences 2025年 299卷

作者： Xinghan Qiu Jiaming Guo Changguo Wang Huifeng Tan Center for Composite Materials Harbin Institute of Technology Harbin 150001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 China

Theoretical understanding is essential for revealing wrinkling mechanisms, characterizing wrinkle behaviors, and guiding the design of thin films. However, existing studies on stretch-induced wrinkling in thin films still exhibit significant limitations in describing non-uniform wrinkle characteristics and post-buckling bifurcation evolution. This paper presents a novel wrinkle bifurcation theory based on energy methods. An energy model for a single wrinkle stripe is first constructed, and the concept of bifurcation points is introduced to describe the onset of wrinkle evolution. Specifically, the theory addresses typical nonuniform and localized instability modes in rectangular thin films under tension. By decomposing the axial boundary conditions and incorporating both mechanical and geometrical properties, this approach accurately captures spatial wrinkle variations and provides a detailed post-buckling bifurcation analysis. The concept of energy barriers, along with the decomposition of total energy into stretching and bending components, is employed to elucidate the evolution mechanism of wrinkle bifurcation throughout the loading process. This study offers valuable insights for the mitigation and control of wrinkles in rectangular thin film structures.

关键词： Bifurcation (mathematics)

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Research on the Crystal Growth, Band Structure and Luminescence Mechanism of (CH3NH3)2HgI4

arXiv

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arXiv 2025年

作者： Liu, Linlin Chen, Zuanquan Yang, Wensi Zhang, Sen Zhu, Jiaqi National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

Nuclear radiation detectors play a crucial role in fields such as nuclear safety and medical imaging. The core of their performance lies in the selection of detection materials. Semiconductor detectors have become a hot topic in current research due to their advantages such as small size, good energy resolution, and high detection efficiency. As one of the most promising materials for fabricating room - temperature nuclear radiation semiconductor detectors, HgI2 exhibits excellent detection performance due to its high atomic number, large band gap, strong ray - stopping power, and high volume dark resistivity. However, issues such as poor chemical stability and low vacancy mobility of HgI2 limit its development. Therefore, researchers have carried out inorganic doping/organic hybridization on it. By introducing the organic ligand CH3NH3I, the synthesis of organic - inorganic hybrid compounds based on HgI2 is expected to significantly improve the stability of HgI2. Research on organic - inorganic hybrid metal halide crystals shows that this material has great application potential in the field of luminescent materials. In this paper, the crystal morphologies of (CH3NH3)2HgI4 under vacuum and in different solvent - anti - solvent systems were simulated. The crystal morphology of (CH3NH3)2HgI4 in the ethyl acetate - toluene system is long - plate - shaped, with the (002) plane being the largest exposed plane. Subsequently, a flake - shaped crystal with dimensions of 10 mm×9 mm×1 mm was prepared by the solution method in this system. XRD diffraction analysis revealed that its largest exposed plane is consistent with the morphology simulation results in this solvent system. Calculations show that (CH3NH3)2HgI4 is an indirect - band - gap semiconductor (Eg=3.28 eV). The ultraviolet - visible spectrum shows that its optical band gap is 3.11 eV, which is smaller than the calculated value. Therefore, it is speculated that there may be exciton luminescence in (CH3NH3)2HgI4. T

关键词： Crystal atomic structure

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advanced synthesis strategy for high-density amorphous SiBCN ceramics with exceptional oxidation resistance via vacuum pyrolysis and spark plasma sintering

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Ceramics International 2025年

作者： Yan, Qiang Chen, Siyao Yang, Xuan Chen, Xinhao Li, Jinping Meng, Songhe National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 China

Development of improved synthesis strategies for amorphous SiBCN ceramics is essential to their service as high-temperature structural materials for engineering applications. Herein, we report the successful fabrication of high-density (2.26 g/cm³) and oxidation-resistant amorphous SiBCN ceramics through a synergistic approach combining spark plasma sintering (SPS) and polymer-derived vacuum pyrolysis. Comprehensive characterization revealed that the optimized processing route significantly reduced open porosity to 2.39 % while enhancing the graphitization transition of free carbon and constructing a complex C-B-N 3D network structure. These microstructural improvements effectively suppressed oxidation activity and crystallization propensity. Notably, the vacuum-pyrolyzed SiBCN ceramics exhibited outstanding high-temperature oxidation resistance, with a minimal mass change of 1.17 mg/cm² and the formation of a dense, intact oxide layer. Kinetic analysis indicated an oxidation rate constant of 40.2 μm²/h, which was significantly reduced by 87.8 % compared to the argon-pyrolyzed counterpart (330.7 μm²/h). This improvement was attributed to the synergistic effects of graphitization-induced barrier formation and enhanced network connectivity in the C-B-N architecture. These findings highlight the critical role of vacuum pyrolysis in tailoring microstructural features for superior oxidation resistance and thermal stability. The proposed synthesis methodology provides a novel framework for developing high-performance ceramic materials with tailored properties for extreme environment applications. © 2025

关键词： Amorphous SiBCN ceramics Antioxidant performance Oxide layer Vacuum pyrolysis

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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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An experimental study of ultra-high temperature ceramics under tension subject to an environment with elevated temperature,mechanical stress and oxygen

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science China(Technological sciences) 2019年第8期62卷 1349-1356页

作者： HAN XinXing XU ChengHai JIN Hua XIE WeiHua MENG SongHe National Key Laboratory of Science and Technology for National Defence on Advanced Composites in Special Environments Harbin Institute of Technology

Ultra-high temperature ceramic(UHTC) composites are widely used in high-temperature environments in aerospace applications. They experience extremely complex environmental conditions during service, including thermal, mechanical and chemical loading. Therefore, it is critical to evaluate the mechanical properties of UHTCs subject to an environment with elevated temperature, mechanical stress and oxygen. In this paper, an experimental investigation of the uniaxial tensile properties of a ZrB_2-SiC-graphite subject to an environment with a simultaneously elevated temperature, mechanical stress and oxygen is conducted based on a high-temperature mechanical testing system. To improve efficiency, an orthogonal experimental design is used. It is suggested that the temperature has the most important effect on the properties, and the oxidation time and stress have an almost equal effect. Finally, the fracture morphology is characterized using scanning electron microscopy(SEM), and the mechanism is investigated. It was concluded that the main fracture mode involved graphite flakes pulling out of the matrix and crystalline fracture, which indicates the presence of a weak interface in the composites.

关键词： ultra-high temperature ceramics environment with elevated temperature mechanical stress and oxygen uniaxial tensile strength orthogonal experimental design

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Comparison of Thermo-Structural Responses for Integrated Thermal Protection Panels with Different Corrugated Core Configurations

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Journal of Harbin Institute of technology(New Series) 2013年第6期20卷 21-28页

作者： Shu-Yuan Zhao Jian-Jun Li Xiao-Dong He Science and Technology on Advanced Composites in Special Environments Laboratory Harbin Institute of Technology

To explore new light-weight integrated thermal protection system panel configuration and gain good insight into the responses mechanism,heat transfer and structural field analysis for one single-layer and four double-layer corrugated core panels were performed. The obtained the temperature,buckling,stress and deflection responses were compared,and the deflection and stress distributions as well as thermal buckling mode at the time were discussed for the considered configurations when the temperature difference between the top and bottom face sheet was maximum. The results demonstrated that the non-orthogonal and hat-stiffened double-layer structures provide superior performance to resist thermal buckling deformation in comparison with other configurations. The useful information is provided for the forthcoming optimization in which thermal buckling is considered as critical design driver.

关键词： Integrated Thermal Protection System corrugated heat transfer thermal bucklingCLC number：V214.4 Document code：AArticle ID：1005-9113（2013）06-0021-08

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Pressure-induced instability and its coupled aeroelasticity of inflated pillow

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Chinese Journal of Aeronautics 2022年第2期35卷 1-7页

作者： Ji ZHANG Changguo WANG Jiaming GUO Jiawei ZHANG National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Special Environments Harbin Institute of TechnologyHarbin 150080China b Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150001China

A floating air weapon system(such as airborne floating mines)plays an important role in modern air defense *** paper focuses on aeroelastic characteristics of airborne floating mine named inflated ***,the dynamic deployable process of the pillow and characteristics of the local instability of the edge are studied,and the evolution mechanism of wrinkles and kinks is ***,in the cruising stage,the fluid-structural-thermal coupling analysis is performed on the pillow,and the aeroelastic characteristics are ***,the shapepreserving effect of the inflated pillow during the“negative pressure”slow landing stage is *** is found that when the wind velocity is higher,the pillow has a collapsed instability(surface extrusion and contact),and when the wind velocity is lower,snap-through instability ***,for the collapsed instability,a carbon fiber skeleton is added to discrete the large global collapsed fold into small local folds,thus achieving shape-preserving effect of *** snapthrough instability,the critical internal pressure and different shape evolution under different wind velocity are *** the analysis of the mechanical mechanism and control of the structural morphological evolution,it provides theoretical guidance for the application of the curved shell structure in floating air weapon system.

关键词： Aeroelastic analysis Fluid-structural-thermal coupling analysis Inflated pillow Kink Pressure-induced instability Wrinkle

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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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Nano-TiO_(2) coate d nee dle carbon fib er reinforced phenolic aerogel composite with low density, excellent heat-insulating and infrared radiation shielding performance

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Journal of Materials science & technology 2023年第21期152卷 181-189页

作者： Yiwu Pan Xiangyu Jin Hebing Wang He Huang Can Wu Xiaojie Yan Changqing Hong Xinghong Zhang National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China

High-performance thermal protection materials(TPMs)for spacecraft are becoming current research *** polymer-based ablators are considered to be the most promising candidates for TPMs due to their excellent designability and *** this study,a unique nano-TiO_(2) coated needled carbon fiber felt/phenolic resin aerogel composite(TiCF/PR)is *** the anatase nano-TiO_(2) was in-situ coated on the surface of carbon fibers uniformly through the sol-gel and calcination method,then,the phenolic resin aerogel was in-situ synthesized in the nano-TiO_(2) coated needled carbon fiber felt(TiCF)preform through vacuum impregnation and solvothermal *** as-prepared aerogel com-posite possesses a low density(0.30–0.32 g/cm^(3)),low thermal conductivity(0.034 and 0.312 W/(m K)in the z and xy directions),and excellent thermal stability with 13.86%residual weight at 1300℃ in *** is worthwhile to note that the TiCF/PR composite exhibits excellent antioxidant ablation and infrared(IR)radiation shielding properties in a high-temperature heating *** an oxygen-acetylene blaze heating of 1.5 MW/m^(2) for 150 s,the linear ablation rates decreased by 13.4%,and the backside temperature reduced from 322.3 to 179.1℃ compared to that of the sample without nano-TiO_(2) *** experimental and theoretical analysis showed that the present TiCF/PR nanocomposite has competitive and potential application prospects in the field of future TPMs.

关键词： Carbon fiber Opacifier Mechanical properties Thermal properties Ablation performance

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