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Shock-Resistant and Energy-Absorbing Properties of bionic NiTi Lattice Structure Manufactured by SLM

Journal of bionic engineering 2022年第6期19卷 1684-1698页

作者： Zhenglei Yu Renlong Xin Zezhou Xu Luming Sha Lixin Chen Yining Zhu Ping Liang Zhihui Zhang Zhenze Liu Qing Cao College of Communication Engineering Jilin UniversityChangchun130022China Key Laboratory of Engineering Bionics Ministry of EducationJilin UniversityChangchun130022China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun130022China School of Agriculture Yanbian UniversityYanji133002China

Each specific structure of organisms is the best choice under specific *** excellent characteristic structures of these organisms have great application potential in the design and multi-functional optimization of energy-absorbing structures such as vehicle collisions,satellite landings,and military *** this paper,using the principle of structural bionics,using the advantages of the honeycomb structure and the light weight and high strength of beetle elytra,four bionic lattice structures are studied:CH,ZPRH,SCH and *** NiTi shape memory alloy,a unique material as the base material,samples are prepared using selective laser melting(SLM)*** comparing the test results of the quasi-static compression test with the results of the numerical simulation,it is found that compared with the other three bionic lattice structures,the SCH structure has the best energy absorption effect in the effective stroke in the test,and the specific energy absorption can reach 6.32 J/***,SCH,and IBE structures not only have good and stable deformation behavior,but also have excellent impact resistance and shape memory *** design of these structures provides a reference for the design of anti-shock cushioning structures with self-recovery functions in the future.

关键词： engineering bionics bionic structural design Additive manufacturing Quasi-static compression Numerical simulation Shape memory effect

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Micro-structure evolution, precipitation behavior and strengthening mechanism of Ni-Cr-Mo system steel fabricated via laser powder bed fusion and subsequent quenching control

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Chinese Journal of Aeronautics 2025年第3期 564-596页

作者： Qing WANG Deyin KONG Shihui ZHOU Xingran LI Zhihui ZHANG The Key Laboratory of Bionic Engineering (Ministry of Education) Jilin University Weihai Institute for Bionic Jilin University State Key Laboratory of Automotive Simulation and Control Jilin University

High-performance 24CrNiMo steel was fabricated using Laser Powder Bed Fusion(LPBF). Subsequent quenching treatment was applied and the influence of quenching temperatures on micro-structure evolution and properties was systematically characterised and analysed. The micro-structure of the as-built steel consisted of two parts. The first part comprised martensite with twins combined with ω-Fe nano-particles, and the second part consisted of lower bainite in the molten pool, as well as upper bainite, granular bainite and tempered martensite in the heat-affected zone. With the quenching temperatures varying from 800 °C to 950 °C, the micro-structure gradually transformed from acicular ferrite + martensite to tempered martensite +θ-Fe3C carbides,and the grain size exhibited noticeable growth. Moreover, quenching treatments could eliminate the anisotropy and inhomogeneity of the micro-structure. The rod-shaped nanosized η-Fe2C andθ-Fe3C precipitates were clearly observed, which were converted from ω-Fe and distributed at multiple angles in the lath. The size and number of nano-precipitates, triggered by the high selftempering degree of martensite, gradually increased. The relationships among grain size, the twins,dislocation density and nano-precipitation and the dramatically improved performance of quenched samples were analysed using strengthening mechanisms. After quenching at 850 °C,the as-built 24CrNiMo steel attained ultra-high mechanical properties including hardness, Ultimate Tensile Strength(UTS), Elongation(El) and impact energy with values of 480.9 HV1, 1611.4 MPa,9.8% and 42.8 J, respectively. Meanwhile, both the wear and thermal fatigue resistance increased by approximately 40%. This study demonstrated that LPBF-fabricated 24CrNiMo steel, with matching good performances, can be achieved using a subsequent one-step quenching process.

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High-Porosity, Layered Iridium Oxide as an Efficient, Durable Anode Catalyst for Water Splitting

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CCS Chemistry 2025年第1期7卷 216-228页

作者： Zhoubing Xie Xiao Liang Zhenye Kang Yongcun Zou Xiyang Wang Yimin A.Wu Graham King Qi Liu Yalan Huang Xiao Zhao Hui Chen Xiaoxin Zou State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012 State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228 Department of Mechanical and Mechatronics Engineering Waterloo Institute for NanotechnologyUniversity of WaterlooWaterlooOntario N2L 3G1 Canadian Light Source Saskatoon SK S7N 2V3 Department of Physics City University of Hong KongHong Kong 999077 School of Materials Science and Engineering Key Laboratory of Automobile Materials of MOEState Key Laboratory of Automotive Simulation and ControlElectron Microscopy CenterJilin UniversityChangchun 130012

Lowering iridium(Ir)loading without sacrificing activity and durability is critical to the future development of proton exchange membrane water electrolyzer(PEMWE).Here,we present the synthesis of iridate-derived,layered iridium oxide microparticles(dubbed p-L-IrO_(2))with a high open porosity of approximately 74%and their structural advantages for the fabrication of efficient,durable,low-Ir-loading anode catalytic layer in *** p-L-IrO_(2) material is synthesized by an easily scalable route involving acid treatment of alkali metal salt-templated iridates that form in mixed alkali metal nitrateshydroxides at low *** combination of high-porosity morphology and layered structure in the material preferentially exposes a high density of hydroxylated edge sites,which are catalytically active and stable to achieve the oxygen evolution reaction via a structurally hydroxyl group-participated adsorbate evolution *** material is further demonstrated to enable the fabrication of low-Ir-loading anode catalytic layers in PEMWE,which can afford excellent catalytic performance(2.7 A cm^(−2)@1.9 V@80℃;membrane:Nafion^(TM)N115)due to the simultaneous reduction of activation and mass transport losses and retention of catalytic activity for 2300 h at 1.0 A cm^(−2) current density.

关键词： electrocatalysis water splitting iridium porous materials PEM electrolyzer

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Critical Laplace Pressure and Dewetting Tansition of Aluminum-Based Superhydrophobic Surfaces Textured with a Nanosecond Laser

SSRN

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SSRN 2024年

作者： Wang, Guoyong Xu, Zhengzheng Li, Danqing Jiang, Yue Jiang, Zhonghao Liu, Yan Yang, Chun Cheng Key Laboratory of Automobile Materials Department of Materials Science and Engineering Jilin University Changchun130025 China Key Laboratory of Bionic Engineering Ministry of Education College of Biological and Agricultural Engineering Jilin University Changchun130025 China Key Laboratory of Bionic Engineering Ministry of Education State Key Laboratory of Automotive Simulation and Control Jilin University Changchun130022 China

In critical areas such as aerospace, where the formation of frost can pose a serious threat to safety, delaying and preventing its formation has become extremely important. Although it has been shown that superhydrophobic surfaces (SHs) are capable of delaying ice formation, these surfaces have challenges in maintaining the stability of the Cassie-Baxter (CB) state, especially in high humidity and freezing environments, which limits their application in anti-icing and de-icing. To deal this issue, in this study, a low-cost near-infrared nanosecond laser technique was used instead of the more expensive ultrafast femtosecond laser by inducing the formation of three different micro/nanostructured superhydrophobic surfaces on the aluminum surface. The critical Laplace pressure of these surfaces was tested by evaporation experiments. Further icing/melting cycle experiments observed the ability of these superhydrophobic surfaces to recover from the CB state. The experimental results showed that the surfaces with higher critical Laplace pressures were more likely to recover the CB state under the same conditions, implying that they were better able to maintain their superhydrophobic properties after undergoing the icing/melting process. The results not only deepen our understanding of icing and melting phenomena, but also provide important scientific guidance for the design of superhydrophobic anti-icing surfaces with high CB state stability. These findings are of great practical application value and scientific significance for the development of new anti-icing materials, especially in aerospace and other fields that require high safety. © 2024, The Authors. All rights reserved.

关键词： Recovery

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Analysis of the Climbing and Forward Flight Mechanism of Dragonflies 2nd

Analysis of the Climbing and Forward Flight Mechanism of Dra...

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2nd International Conference on the Frontiers of Robotics and Software engineering, FRSE 2024

作者： Zhi, Yi Shen, Huan Ji, Aihong Lab of Locomotion Bioinspiration and Intelligent Robots The College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China Jiangsu Key Laboratory of Bionic Materials and Equipment Nanjing210016 China State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and Astronautics Nanjing210016 China

ISBN: (纸本)9789819630127

In recent years, bionic micro air vehicles have garnered significant attention. Compared to other insects and birds, dragonflies exhibit unique flight capabilities, making them one of the best bionic prototypes. To better understand the flight characteristics of dragonflies and to delve into their flapping aerodynamics, this study investigates the kinematic parameters of dragonflies during escape flight (climbing) and normal flight (forward flight). Using four synchronously triggered high-speed cameras, the motion of the dragonflies was tracked and captured, followed by system calibration, feature point matching, and 3D reconstruction. Analysis revealed that dragonflies utilize a figure-8 wingtip trajectory during both climbing and forward flight. The intersection of the trajectory occurs near the pronation phase, which helps generate higher lift and thrust. During forward flight, the phase difference between the forewings and hindwings is smaller compared to climbing, with the downstroke occupying approximately 24% more of the flapping cycle during forward flight than climbing. Additionally, the results indicate that dragonflies do not maintain a fixed linear flight path in either state but exhibit periodic changes in the pitch angle. Climbing requires greater pitch angles and variations in pitch angle compared to forward flight to achieve higher lift. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： High speed cameras

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Phosphate removal by a La(OH)_(3) loaded magnetic MAPTAC-based cationic hydrogel:Enhanced surface charge density and Donnan membrane effect

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Journal of Environmental Sciences 2022年第3期34卷 26-39页

作者： Yanqing Zhou Yili Wang Shuoxun Dong Haotian Hao Junyi Li Chenyang Liu Xiaolin Li Yao Tong College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water PollutionBeijing Forestry UniversityBeijing 100083China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100083China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Cationic hydrogels have received great attention to control eutrophication and recycle *** this study,a type of La(OH)_(3) loaded magnetic MAPTAC-based cationic hydrogel(La(OH)_(3)@MMCH)was developed as a potential adsorbent for enhanced phosphate removal from aqueous ***(OH)_(3)@MMCH exhibited high adsorption capacity of 105.72±5.99 mg P/g,and reached equilibrium within 2 ***(OH)_(3)@MMCH could perform effectively in a wide pH range from 3.0 to 9.0 and in the presence of coexisting ions(including SO_(4)^(2-),Cl^(-),NO_(3)^(-),HCO_(3)^(-),SiO_(4)^(4-) and HA).The adsorption-desorption experiment indicated that La(OH)_(3)@MMCH could be easily regenerated by using NaOH-NaCl as the desorption agent,and 73.3%adsorption capacity remained after five ***,La(OH)_(3)@MMCH was employed to treat surface water with phosphate concentration of 1.90 mg/L and showed great removal efficiency of 95.21%.Actually,MMCH showed high surface charge density of 34.38-59.38 meq/kg in the pH range from 3.0 to 11.0 and great swelling ratio of 3014.57%within 24 h,indicating that MMCH could produce the enhanced Donnan membrane effect to pre-permeate ***,the bifunctional structure of La(OH)_(3)@MMCH enabled it to capture phosphate through electrostatic attraction and ligand *** the results prove that La(OH)_(3)@MMCH is a promising adsorbent for eutrophication control and phosphate recovery.

关键词： Cationic hydrogel La(0H)_(3) Phosphate adsorption Enhanced Donnan membrane effect

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bionic Optimization for Cooling Structure of Gan Hemts Inspired by Leaf Vein Structure

SSRN

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SSRN 2023年

作者： Xu, Xiaoyu Zhang, Tianshi Gao, Qing Han, Zhiwu Huang, Haizhen Liu, Xiaoyan Chen, Haopeng College of Automotive Engineering Jilin University Jilin China State Key Laboratory of Automotive Simulation and Control Jilin University Jilin China Key Laboratory of Bionic Engineering Ministry of Education Jilin University Jilin China

Inspired by the leaf vein structure, this article proposes cooling structures with tapered contracting manifold and fractal feature, to optimize the cold plate structure for high heat flux gallium nitride high electron mobility transistors (GaN HEMTs). The correlation between the fluid flow distribution in channels and the temperature uniformity of chips is investigated. The performance of the designed bionic Structures is compared with that of the traditional Parallel Structure in terms of fluid flow characteristics, heat transfer characteristics and comprehensive performance. Results show that the bionic Structures with tapered contracting manifold and fractal feature improve the fluid flow uniformity by up to 44.1% and the temperature uniformity of chips by up to 65.0%, while reducing the pressure drop by up to 24.7% and the convective heat transfer resistance by up to 32.8%. The comprehensive performance is also significantly improved. This article demonstrates the great potential of bionic cooling structure for breaking through the thermal management limit of high heat flux power chips. © 2023, The Authors. All rights reserved.

关键词： Heat flux

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Systematic control technologies for gaseous pollutants from non-ferrous metallurgy

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Journal of Environmental Sciences 2023年第1期123卷 65-82页

作者： Hui Liu Fenghua Shen Qingzhu Li Minneng Wen Hongliang Zhang Linhua Jiang Chenghang Zheng Yan Liu Tao Liu Liyuan Chai School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Changsha 410083China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China College of Environmental Science and Engineering Tongji UniversityShanghai 200092China State Key Lab of Clean Energy Utilization State Environmental Protection Engineering Center for Coal-Fired Air Pollution ControlZhejiang UniversityHangzhou 310027China Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education School of MetallurgyNortheastern UniversityShenyang 110819China School of Resource and Environmental Engineering Wuhan University of Science and TechnologyWuhan 430081China

Air pollutant emissions represent a critical challenge in the green development of the non-ferrous metallurgy *** work studied the emission characteristics,formation mechanisms,phase transformation and separation of typical air pollutants,such as heavy metal particles,mercury,sulfur oxides and fluoride,during non-ferrous smelting.A series of purification technologies,including optimization of the furnace throat and hightemperature discharge,were developed to collaboratively control and recover fine particles from the flue gas of heavy metal smelting processes,including copper,lead and *** improvements have been realized in wet scrubbing technology for removing mercury,fluoride and SO_(2)from flue ***-liquid sulfidation technology by applying H_(2)S was invented to recycle the acid scrubbing wastewater more efficiently and in an eco-friendly *** on digital technology,a source reduction method was designed for sulfur and fluoride control during the whole aluminum electrolysis *** desulfurization technologies were developed for catalytic reduction of the sulfur content in petroleum coke at low temperature and catalytic reduction of SO_(2)to elemental *** work has established the technology for coupling multi-pollutant control and resource recovery from the flue gas from non-ferrous metallurgy,which provides the scientific theoretical basis and application technology for the treatment of air pollutants in the non-ferrous metallurgy industry.

关键词： Non-ferrous smelting Gaseous pollutant Flue gas purification Acid wastewater Heavy metal

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Study of Cracking Mechanism and Wear Resistance in Laser Cladding Coating of Ni-based Alloy

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Chinese Journal of Mechanical engineering 2021年第5期34卷 259-272页

作者： Zhenglei Yu Lunxiang Li Deqiang Zhang Guangfeng Shi Guang Yang Zezhou Xu Zhihui Zhang Key Lab of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022China College of Mechanical and Electric Engineering Changchun University of Science and TechnologyChangchun 130022China College of Mechanical Engineering and Automation Liaoning University of TechnologyJinzhou 121001China Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process Shenyang Aerospace UniversityShenyang 110136China

Nickel-based alloy coatings were widely used for the remanufacturing of dies and moulds by laser cladding,but the crack sensitivity would be increase due to the higher strength and hardness,which reduced the wear resistance of Ni-based *** this paper,Ni-based coatings with the addition of a plastic phase(an austenitic stainless net)were prepared using laser cladding technology,and the CeO_(2)was added in cladding *** cracking mechanism,microhardness,microstructure,phase composition,and wear properties were *** relationship between thermal stress and the elastic and plastic fracture had been developed from the standpoint of fracture mechan-ics and thermal elastic fracture *** fracture criterion of the nickel-based coating was obtained,and the study has shown that the crack sensitivity could be reduced by decreasing the thermal expansion coefficientΔα.Thus,a new method was proposed,which the stainless steel nets were prefabricated on the *** was found that the number of cracks reduced significantly with the addition of stainless steel *** the stainless steel net with 14 mesh was added in Ni-based coatings,the average microhardness of nickel composite coating was 565 HV_(0.2),which was 2.6 times higher than that of the 45 steel *** the rare earth oxide 4 wt.%CeO_(2)and stainless steel net were added in the Ni-based coating reducing the microhardness(the average microhardness is 425 HV_(0.2)),the wear resistance of it improved *** wear volume of Ni-based composite coating was 0.56×10^(−5) mm^(3)·N^(−1)·m^(−1),which was 85.1%lower than that of 45 *** experiment results have shown that the Nickel-based composite coating is equipped with low crack sensitivity and high abrasive resistance with austenitic stainless net and the rare earth oxide 4 wt.%*** research offers an efficient solution to produce components with low crack susceptibility and high wear-resistance coatings fabricated

关键词： Laser cladding Wear resistance Crack sensitivity Stainless steel net Rare earth oxide

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Progress in quantitative research on the relationship between atmospheric oxidation and air quality

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Journal of Environmental Sciences 2023年第1期123卷 350-366页

作者： Yuesi Wang Xin Jin Zirui Liu Gehui Wang Guiqian Tang Keding Lu Bo Hu Shanshan Wang Guohui Li Xinqin An Chao Wang Qihou Hu Lingyan He Fenfen Zhang Yuanhang Zhang State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China 3 State Key Joint Laboratory or Environmental Simul ation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Key Lab of Geophysical Information System of the Ministry of Education School of Geographic SciencesEast China Normal UniversityShanghai 200241China Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3) Department of Environmental Science and EngineeringFudan UniversityShanghai 201203China Key Lab of Aerosol Chemistry and Physics State Key Laboratory of Loess and Quaternary GeologyInstitute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China Institute of Atmospheric Composition and Environmental Meteorology Chinese Academy of Meteorological SciencesBeijing 100081China Key Lab of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China

Atmospheric oxidizing capacity(AOC)is an essential driving force of troposphere chemistry and self-cleaning,but the definition of AOC and its quantitative representation remain *** by national demand for air pollution control in recent years,Chinese scholars have carried out studies on theories of atmospheric chemistry and have made considerable progress in AOC *** paper will give a brief review of these ***,AOC indexes were established that represent apparent atmospheric oxidizing ability(AOIe)and potential atmospheric oxidizing ability(AOIp)based on aspects of macrothermodynamics and microdynamics,respectively.A closed study refined the quantitative contributions of heterogeneous chemistry to AOC in Beijing,and these AOC methods were further applied in Beijing-Tianjin-Hebei and key areas across the *** addition,the detection of ground or vertical profiles for atmospheric OH·,HO_(2)·,NO_(3)·radicals and reservoir molecules can now be obtained with domestic instruments in diverse ***,laboratory smoke chamber simulations revealed heterogeneous processes involving reactions of O_(3)and NO_(2),which are typical oxidants in the surface/interface atmosphere,and the evolutionary and budgetary implications of atmospheric oxidants reacting under multispecies,multiphase and multi-interface conditions were ***,based on the GRAPES-CUACE adjoint model improved by Chinese scholars,simulations of key substances affecting atmospheric oxidation and secondary organic and inorganic aerosol formation have been *** numerical simulations of AOIe and AOIp were performed,and regional coordination of AOC was *** optimized plan for controlling O_(3)and PM2.5was analyzed by scenario simulation.

关键词： Atmospheric oxidizing capacity(AOC) Quantitative index Free radicals Observation and modeling Air quality

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