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22nd International Conference on Composite Materials, ICCM 2019

作者： Dai, Fuhong Pan, Diankun National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Harbin Institute of Technology Harbin150001 China

Recently, bi-stable composite laminate is investigated for broadband energy harvesting because of its nonlinear characteristics during vibrations. This paper presents a bi-stable piezoelectric composite laminate (BPCL) for energy harvesting which consists of bi-stable hybrid symmetric laminate (BHSL) and PZT transducers bonded on the surfaces of BHSL. This bi-stable piezoelectric laminate has a better energy harvesting performance under low-frequency vibration. The open circuit voltages of the PZT transducer are predicted by finite element analysis (FEA) to illustrate the uniformity of voltage distribution, thus demonstrating the uniformity of strain distribution of PZT. Based on the assumption that the stain distributions of PZT are homogenous, a simple theoretical model is proposed to predict the output power under ideal continuous snap-through vibration pattern. This model is verified by experimental results. The maximum output power measured by experiment is 44.4 mW at 8 Hz. © 2019 International Committee on Composite Materials. All rights reserved.

关键词： Energy harvesting

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Synergetic catalytic removal of chlorobenzene and NOχfrom waste incineration exhaust over MnNb0.4Ce0.2Oχcatalysts:Performance and mechanism study

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Journal of Rare Earths 2020年第11期38卷 1178-1189,I0002页

作者： Bo Yang Qijie Jin Qiong Huang Mindong Chen Leilei Xu Yuesong Shen Haitao Xu Shemin Zhu Xiujun Li Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET) Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlSchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites College of Materials Science and EngineeringNanjing TechUniversityNanjing 210009China Department of Chemistry and Biochemistry Environmental Science&Engineeringand Biomedical EngineeringUniversity of Texas at EL PasoEL PasoTX 79968USA

Nb doped MnCe0.2Ox complex oxides catalysts prepared via a homogeneous precipitation method were investigated for synergistic catalytic removal of NOx and chlorobenzene(CB)at low *** MnNb0.4Ce0.2Ox catalyst with a molar ratio of Nb/Mn=0.4 exhibits excellent activity and the NOx and CB removal efficiency reaches 94.5%and 96%at 220℃,***,the NOx and CB removal efficiency of MnNb0.4Ce0.2Ox still remains above 80%after injecting 300 ppm SO2 and 7 vol%H2 O for 36 *** addition,the presence of CB and NOx+NH3 can improve the NOx and CB removal efficiency of MnNb0.4Ce0.2Ox,*** analysis results from N2-BET,Py-IR,H2-TPR and NH3-TPD reveal that the introduction of Nb increases the average pore size,pore volume and surface area,promoted the growth of Lewis acid amount obviously,and enhances redox ability of MnCe0.2Ox at 100-250℃.Moreover,the molecular migration process of NOx,NH3,CB and SO2 in NH3-SCR and CB oxidation reaction over MnNb0.4Ce0.2Ox catalysts were systematically *** situ DRIFTS,FT-IR and XPS also confirm that the adsorption of sulfate species and SO2 on the surface of MnNb0.4Ce0.2Ox is inhibited effectively by the introduction of Nb in the presence of SO2 and H2 ***,Nb additives also enhance the structural stability of MnNb0.4Ce0.2Ox,due to the interactions among Mn,Nb and *** NH3-TPD,H2-TPR and in situ DRIFTS results also confirm that the MnNb0.4Ce0.2Ox still retains abundant acid sites and high redox ability in the presence of SO2 and *** summary,MnNb0.4Ce0.2Ox catalysts represent a promising and effective candidate for controlling NOx and CB at low temperatures.

关键词： Synergistic catalytic removal Nitrogen oxides(NOx) Chlorobenzene(CB) Hydrothermal stability Removal mechanism Rare earths

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Influence of pre-existing interfacial damage on the ballistic behavior of ceramic composite armor systems: An experimental and numerical analysis

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Thin-Walled Structures 2025年 215卷

作者： Shibao Wu Chaocan Cai Guanjie Wang Xiaojun Wei Zhonghai Xu Qingyu Peng National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 China Suzhou Research Institute of HIT Harbin Institute of Technology Suzhou 215104 China

In recent years, Ceramic Composite Armor Systems (CCAS) have gained extensive applications in protective configurations of various armored weapon platforms due to their exceptional ballistic behavior. Nevertheless, the integration of functional modules into cohesive interfaces for enhancing CCAS intelligence presents a technical paradox: such modifications inevitably induce pre-existing interfacial debonding/delamination defects that may adversely affect ballistic behavior. Using a simplified Al 2 O 3 /Carbon Fiber (CF)/Aramid Fiber (AF) composite armor configuration as a representative example, this work systematically examines through combined Ballistic Limit Test (BLT) and Finite Element Analysis (FEA) how pre-existing damage parameters (including location, area and quantity) at both Al 2 O 3 -CF and CF-AF interfaces influence critical ballistic behavior responses, especially the residual velocity, back face deformation, damage circumstance and its extension patterns, etc. The results of the FEA are validated with the experimental results. The key findings reveal that under equivalent damage areas with single pre-existing damage, interfacial debonding at the Al 2 O 3 -CF interface demonstrates more pronounced ballistic behavior degradation compared to the CF-AF interface defects. This detrimental effect exhibits amplification beyond critical damage tolerance thresholds. Under dual pre-existing damage conditions, the detrimental effects on the ballistic behavior of the CCAS exhibit significant dependence on damage area combination characteristics.

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Annealing-induced evolution of boron-doped polycrystalline diamond

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Physical Review Materials 2024年第4期8卷 044802-044802页

作者： Gufei Zhang Ramiz Zulkharnay Fabian Ganss Yujie Guo Mohammed Alkhalifah Limin Yang Sen Zhang Shengqiang Zhou Peng Li Yejun Li Victor V. Moshchalkov Jiaqi Zhu Paul W. May National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology 150080 Harbin China Zhengzhou Research Institute Harbin Institute of Technology 450000 Zhengzhou China POLIMA—Center for Polariton-Driven Light-Matter Interactions and Danish Institute for Advanced Study University of Southern Denmark Campusvej 55 DK-5230 Odense M Denmark School of Chemistry University of Bristol Bristol BS8 1TS United Kingdom Institute of Ion Beam Physics and Materials Research Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstraße 400 01328 Dresden Germany Photonics Research Group Department of Information Technology Ghent University-IMEC 9052 Ghent Belgium Department of Chemical Engineering Shandong University of Technology 255000 Zibo China Hunan Key Laboratory of Nanophotonics and Devices School of Physics and Electronics and School of Materials Science and Engineering Central South University 410083 Changsha China Department of Physics and Astronomy KU Leuven B-3001 Heverlee Belgium

Diamond shows great promise for opening up new paradigms in the semiconductor industry and quantum electronics. Here, we investigate the influence of thermal annealing on the structural and electrical transport properties of heavily boron-doped polycrystalline diamond (BPD) thin films. Our structural analyses show that annealing beyond 600∘C can induce severe local amorphization in a BPD thin film and transform it into a binary mixture of spatially separate domains of amorphous carbon (a-C) and diamond grains. Due to this annealing-induced morphology and phase segregation, the BPD thin films demonstrate a significant decrease of the electron localization radius and a distinct increase of the Ginzburg-Landau coherence length. Our research provides physical insight into the conversion of diamond to a-C and aids in defining the application scope of BPD by revealing its heat tolerance.

关键词： Electrical properties Localization Phase transitions Polycrystals Structural properties Amorphous materials Diamond Doped semiconductors Granular solids Low-temperature superconductors Semiconductors Superconductors Annealing Chemical vapor deposition Raman spectroscopy

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New Equations for Describing Contact Area between Tire and Ground

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橡胶工业 2020年第9期67卷 670-676页

作者： CUI Zhibo SU Zhaoqian HOU Dandan ZHANG Chunsheng WANG Youshan LIU Yuyan WU Jian Key Laboratory of the Ministry of Industry and Information Technology New Energy Conversion and Critical Material Storage TechnologyHarbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China Zhongce Rubber Group Co. LtdHangzhou 310018China

New equations are proposed to describe the shapes and sizes of the contact areas between tire and ground(the contact areas)under the conditions of static load,slip,camber,and *** equations are super ellipse and trigonometric function with four *** indicate that the contact areas under the conditions of static load,slip,camber can be well described by super ellipse,in the most complicated case,fourteen parameters are *** rolling contact area can be reconstructed by the trigonometric function *** and asymmetrical shapes can both be described *** suggested curves will make calculate size of the areas *** described shapes and sizes are in good agreement with the measured,the maximum deviation is only 2.88%.This work will provide an instrument for understanding the contact area and be helpful for analyzing tire and road.

关键词： contact areas contact shape tire and ground super ellipse equation

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A buckling model of fiber-reinforced composite lattice cylinders with the cutout imperfections

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Engineering Fracture Mechanics 2025年

作者： Wenyu Wang Jian Xiong Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150001 PR China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 PR China

The lattice load-bearing cylinder structure, with its exceptional strength-to-weight ratio, holds great promise for application in aerospace engineering. To facilitate structural assembly or the embedding of electronic equipment, various types of cutout structures are often designed on the main load-bearing lattice cylinder. The existing theoretical research on the failure mechanism of lattice cylinders primarily focuses on regular structures without cutouts. When the lattice cylinder with cutouts undergoes buckling, the complexity of the ribs’ shape hinders the establishment of the energy function. An analysis of the mechanical performance of lattice cylinders with localized cutouts is undertaken. Based on the buckling patterns derived from simulation analyses, displacement function assumptions are formulated. A multi-failure analysis model is established for lattice cylinders with cutouts, revealing their underlying failure mechanisms. The validity of the theoretical model is confirmed through simulations and experiments. The study’s findings demonstrate the influence of cross-sectional size and helical angle on the type of failure. A three-dimensional failure mechanism diagram is constructed, bridging the gap in the theory of failure modes for this type of structure. The study delves into the correlation between the maximum critical loads and the dimensions of rectangular and circular beams that traverse the interstitial spaces within lattice cylinders characterized by cutouts. The bearing efficiency is also explored in the study, with the optimal geometric point being identified through mapping structural mass contours and following the optimal bearing efficiency trajectory. This approach broadens the design space and provides a theoretical basis for engineering applications

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Anisotropic Tensile Mechanics of Vertically Aligned Carbon Nanotube Reinforced Silicon Carbide Ceramic Nanocomposites

SSRN

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SSRN 2022年

作者： Miao, Linlin Yang, Lingwei Wang, Chuanyun Zhao, Guoxin Li, Junjiao Zhao, Yushun Sui, Chao He, Xiaodong Xu, Zhonghai Wang, Chao Center for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China Hypervelocity Aerodynamics Institute China Aerodynamics Research and Development Center Mianyang621000 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China State Key Laboratory of Solidification Processing Northwestern Polytechnical Univerisity Xi’an710072 China Shenzhen STRONG Advanced Materials Research Institute Co. Ltd China

Vertically aligned carbon nanotubes (VACNTs)/silicon carbide (SiC) nanocomposites (VSNs) present remarkably anisotropic mechanical properties originated from their intrinsic heterogeneous microstructures. However, the studies related to tensile mechanical behaviors and failure mechanisms of VSNs are still suspended so far. In this work, the tensile mechanical properties of VSNs were investigated by an in-situ transmission electron microscopy (TEM) tensile test combined with classic molecular dynamics (MD) simulation. The testing results show that the fracture strength and Young’s modulus of VSNs along CNT-axis ( direction) are higher than those perpendicular to CNT-axis (⊥ direction). In addition, the fracture surface along direction is uneven whereas it is flat along ⊥ direction. The MD simulation reveals that the stronger behavior along direction is mainly benefited by the excellent tensile mechanical properties of CNTs, however, the relatively weak van der Waals interaction between CNTs and SiC matrix dominates the tensile performances of VSNs along ⊥ direction. Finally, the remarkable mechanical anisotropy of VSNs is explained by pulling-out and peeling-off failures of CNTs based on MD simulation. This work provides experimental and theoretical insights into the dominant mechanisms of mechanical anisotropy in typical VACNT/ceramic nanocomposites. © 2022, The Authors. All rights reserved.

关键词： Molecular dynamics

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Bilayer Thermal Metadevices that Mold Transient Heat Flows

SSRN

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SSRN 2023年

作者： Ji, Qingxiang Zhang, Qi Guenneau, Sébastien Kadic, Muamer Wang, Changguo National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150001 China UMI 2004 Abraham de Moivre-CNRS Imperial College LondonSW7 2AZ United Kingdom The Blackett Laboratory Department of Physics Imperial College London LondonSW7 2AZ United Kingdom Université de Franche-Comté Institute FEMTO-ST CNRS Besançon25000 France

Thermal manipulation has been widely researched due to its potential in novel functions, such as cloaking, illusion and sensing. To avoid the spatially inhomogeneous and anisotropic heat conductivity tensors (introduced by transformational thermodynamics), several thermal cloaks based on scattering cancellation (SC) approach are designed and experimentally demonstrated. However, the current SC cloak are only effective in the steady-state heat transfer condition as the heat capacity terms are neglected by the requirement of constant external fields. In order to expand the SC cloak to the transient regime, a bilayer scheme is introduced to achieve the accurate solutions of the camouflage equations considering time factors. Indeed, there are two equations to solve with two unknown quantities: first the thermal conductivity and second the product of specific heat capacity by the density. We construct thermal camouflage devices and verify their ability to mold dynamic heat flows both by simulations and experiments. Our proposed method paves an efficient avenue to extend SC approach to dynamic heat transfer regime. © 2023, The Authors. All rights reserved.

关键词： Thermal conductivity

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Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

Research Square

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Research Square 2021年

作者： Du, Baihe Cheng, Yuan Xun, Liancai Zhang, Shuchang Tong, Jing Lv, Qingrong Zhou, Shanbao Hu, Ping Zhang, Xinghong National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin150001 China School of Physics and Material Science Anhui University Hefei230601 China

To find the optimum balance between strength and toughness, as well as acquiring reliable thermal shock resistance and oxidation resistance, has always been the most concerned topic in the discussion of ultra-high temperature ceramic composites. Herein, PyC modified 3D carbon fiber is used to reinforce ultra-high temperature ceramic. The macroscopic block composite with large size is successfully fabricated through ultra-low temperature sintering at 1300 °C without pressure. The prepared PyC modified 3D Cf/ZrC-SiC composites simultaneously possess excellent physical and chemical stability under the synergistic effect of PyC interface layer and ultra-low temperature sintering without pressure. The fracture toughness is increased in magnitude to 13.05 ± 1.72 MPa∙m1/2 accompanied by reliable flexural strength of 251 ± 27 MPa. After rapid thermal shock spanning from RT to 1200 °C, there is no visible surface penetrating cracks, spalling or structural fragmentation. The maximum critical temperature difference reaches 875 °C, which is nearly three times higher than that of traditional monolithic ceramics. The haunting puzzle of intrinsic brittleness and low damage tolerance are resolved fundamentally. Under the protection of PyC interface layer, the carbon fibers around oxide layer and matrix remain structure intact after static oxidation at 1500 °C for 30 min. The oxide layer has reliable physical and chemical stability and resist the erosion from fierce oxidizing atmosphere, ensuring the excellent oxidation resistance of the composites. In a sense, the present work provides promising universality in designability and achievement of 3D carbon fiber reinforced ceramic composites. © 2021, CC BY.

关键词： Chemical stability

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DFT predictions and experimental confirmation of mechanical behaviour and thermal properties of the Ga-bilayer Mo2Ga2C

Research Square

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Research Square 2021年

作者： Qi, Xinxin Yin, Weilong Jin, Sen Zhou, Aiguo He, Xiaodong Song, Guangping Zheng, Yongting Bai, Yuelei National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China School of Materials Science and Engineering Henan Polytechnic University Henan Jiaozuo454003 China

Mo2Ga2C is a new MAX phase with a stacking Ga bilayer as well as possible unusual properties. To understand this unique MAX-phase structure and promote possible future applications, the structure, chemical bonding, mechanical and thermodynamic properties of Mo2Ga2C were investigated by first principles. Using the "bond stiffness" model, the strongest covalent bonding (1162 GPa) were formed between Mo and C atoms in Mo2Ga2C, while the weakest Ga-Ga (389 GPa) bonding were formed between two Ga-atomic layers, different from other typical MAX phases. Of interest, the ratio of the bond stiffness of the weakest bond to the strongest bond (0.33) was lower than 1/2, indicating the high damage tolerance and fracture toughness of Mo2Ga2C, which was confirmed by indentation without any cracks. The high-temperature heat capacity and thermal expansion of Mo2Ga2C were calculated in the framework of quasi-harmonic approximation from 0 K to 2000 K. Because of the metal-like electronic structure, the electronic excitation contribution became more significant with increasing temperature above 300 K. © 2021, CC BY.

关键词： Thermal expansion

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