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Pressure-induced instability and its coupled aeroelasticity of inflated pillow

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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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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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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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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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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The preparation, microstructure, and performance of MoAlB-Si ceramic sintered from combustion-synthesized powder

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Ceramics International 2025年第16期51卷 21800-21809页

作者： Yu, Wanjun Ding, Qizhang Li, Xiangming Zhang, Enliang Han, Wenbo Zheng, Yongting Qi, Yushi School of Environment and Materials Engineering Yantai University Yantai264005 China School of Materials Science and Engineering Harbin Institute of Technology Weihai264209 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China

To streamline the preparation process and improve the performance of the MoAlB phase, the technical potential of an ultra-fast combustion synthesis followed by hot pressing to prepare the MoAlB–Si ceramic was investigated. During the combustion process, the Si atoms occupied the Al positions, which forms a Mo(Al,Si)B solid solution phase. Si doping resulted in the effective grain refinement of the hot-pressed MoAlB-Si ceramic. The grain-refined and solid-solution-strengthened MoAlB-Si ceramic exhibits excellent mechanical properties with a compressive strength of 2.63 GPa, flexural strength of 650 MPa, fracture toughness of 7.26 MPa m1/2, and Vickers hardness of 13.32 GPa. At elevated temperatures, a newly formed oxidation-derived dense and continuous layer on the surface prevents the inward diffusion of oxygen and the volatilisation of oxidation products, indicating good oxidation resistance of the MoAlB-Si ceramic. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Compressive strength

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Effect of titanium on the wettability between Fe-P-Ti alloy and Al2O3 substrate

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Progress in Natural science:Materials International 2024年第3期34卷 555-561页

作者： Rui Wang Shengjie Bai Xu Chen Likui Xie Zhiqiang Yu Yang Kang Yihong Li Yong Hu Zhiyue Shi Zhijie Yan School of Materials Science and Engineering North University of China Shanxi Key Laboratory of Advanced Metal Materials for Special Environments North University of China CISDI Engineering CO. LTD. School of Materials Science and Engineering Taiyuan University of Science and Technology

It is of significance that the wettability between the molten alloy and the Al2O3affects the inclusion removal,nozzle clogging and refractory erosion. In the present work, the wettability between the Al2O3substrate and Fe–P–Ti alloys with different Ti content was investigated by using the sessile droplets method. The interfacial characteristics were investigated by scanning electron microscope（SEM）. The contact angles between the sintered Al2O3substrate and Fe–P–Ti alloys with 0, 0.05, 0.10 and 0.15 wt% Ti are 100.1°, 97.3°, 94.5°and 90.5°,respectively. The oxidation of [Al] and [Ti] in the molten alloys leads to the formation of the oxides on the droplets. With the increase of Ti content in the Fe–P–Ti alloys, the formed oxides change from Al2O3to Ticontaining oxides. The reaction between [Ti] and Al2O3substrate in the interface results in the formation of Ti-containing oxides. The quantity of the interfacial oxides increases with the increase of Ti content in the *** a result, the synergetic effect of the formation of the interfacial products and the oxides on the surface of droplets leads to the decrease of the contact angles between the Al2O3substrate and Fe–P–Ti alloys due to the increase of Ti content.

关键词： Wettability Contact angle Interfacial reaction Fe–P–Ti alloys Al2O3 substrate

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Structural Design of a Kirigami Gripper by Finite Element Method

Structural Design of a Kirigami Gripper by Finite Element Me...

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International Conference on Mechanical Design, ICMD 2023

作者： Yang, Bohan Wu, Jian Li, Zhe Center for Rubber Composite Materials and Structures Harbin Institute of Technology Weihai264209 China National Key Laboratory of Science and Technology On Advanced Composites in Special Environments Harbin150090 China

ISBN: (纸本)9789819709212

Kirigami, an art form derived from paper-art, has gained attention in both artistic and engineering domains due to its ability to transform into complex geometric structures. This study focuses on a type of kirigami gripper, and studies three geometric parameters’ influence on the gripper’s mechanical performances. Experiments were conducted to examine the gripper's uniaxial tensile performance. The results showed a correlation between gripper thickness and tensile force, with thinner structures exhibiting easier deformation and larger displacement. Besides, the length of the cut mainly affected the trend of global curling and local bulging deformation, whereas the cut width mainly affected the max stress. These findings contribute to the understanding of kirigami grippers and their potential applications in various fields. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Finite element method

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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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A multi-fidelity prediction model for vertical bending moment and total longitudinal stress of a ship based on composite neural network

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Journal of Hydrodynamics 2023年第1期35卷 27-35页

作者： Cai-xia Jiang Yu-bo Liu Zi-yuan Wang Shuai Chen Sheng-ze Cai Qi Gao Xue-ming Shao Science and Technology on Advanced Composites in Special Environments Key Laboratory Harbin Institute of TechnologyHarbin150001China China Ship Scientific Research Center Wuxi214082China School of Aeronautics and Astronautics Zhejiang UniversityHangzhou310027China College of Control Science and Engineering Zhejiang UniversityHangzhou310027China

In ship engineering,the prediction of vertical bending moment(VBM)and total longitudinal stress(TLS)during ship navigation is of utmost *** this work,we propose a new prediction paradigm,the multi-fidelity regression model based on multi-fidelity data and artificial neural network(MF-ANN).Specifically,an ANN is used to learn the fundamental physical laws from low-fidelity data and construct an initial input-output *** predicted values of this initial model are of low accuracy,and then the high-fidelity data are utilized to establish a correction model that can correct the low-fidelity prediction ***,the overall accuracy of prediction can be improved *** feasibility of the multi-fidelity regression model is demonstrated by predicting the VBM,and the robustness of the model is evaluated at the same *** prediction of TLS on the deck indicates that just a small amount of high-fidelity data can make the prediction accuracy reach a high level,which further illustrates the validity of the proposed MF-ANN.

关键词： Artificial neural network multi-fidelity vertical bending moment total longitudinal stress

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