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Analysis of composite fuselage structure under axial impact loading

Procedia Structural Integrity 2024年 59卷 230-237页

作者： Ilham Bagus Wiranto Sherly Octavia Saraswati Aditya Rio Prabowo Iqbal Reza Al Fikri Chairunnisa Teguh Muttaqie Muhammad Ilham Adhynugraha Fadli Cahya Megawanto Arif Hidayat Abid Paripurna Fuadi Aryandi Marta Fajar Ari Wandono Abian Nurrohmad Research Center for Process and Manufacturing Industry Technology BRIN Tangerang 15314 Indonesia Department of Mechanical Engineering Universitas Sebelas Maret Surakarta 57126 Indonesia Research Center for Energy Conversion and Conservation BRIN Tangerang 15314 Indonesia Research Center for Testing Technology and Standards BRIN Tangerang 15314 Indonesia Research Center for Aeronautics Technology BRIN Bogor 16350 Indonesia Research Center for Advanced Material BRIN Tangerang 15314 Indonesia Research Center for Hydrodynamics Technology BRIN Surabaya 60117 Indonesia

This study presents the drop mass impact test behavior of a composite stiffened panel using finite element analysis (FEA). The composite panel was a representation of an unmanned aerial vehicle (UAV) fuselage structure, which was simplified and modelled as a stiffened crossbar panel. The panel and stiffener have thicknesses of 2 mm and 3 mm, respectively. Both of those parts were modeled as a woven carbon/epoxy composite. A hemispherical impactor with a diameter of 70 mm was used to study the impact behavior of a composite skin panel. The FEA was performed using a dynamic explicit solver in ABAQUS 6.23. At the beginning of the study, the mesh convergence study was conducted to choose the proper mesh for the main analysis. In addition, the numerical benchmark has also been investigated in this study. The main analysis was performed by varying impact velocities (4.43, 6.26, and 7.67 m/s) and impact mass (50, 100, and 150 kg). Finally, the impact behavior of the composite panel will be discussed thoroughly.

关键词： Composite stiffened panel impact loading Finite Element Analysis

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Facile Synthesis of Tunable Ultra-Thin Anodes for Long-Lasting and High-Energy-Density Lithium Metal Batteries

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SSRN 2024年

作者： Tian, Du Chen, Weimin Shen, Yue Cao, Wenzhu Miao, Wenwen Lai, Zhenghan Chen, Hong Yang, Shanshan Wang, Liang Yu, Faquan Key Laboratory for Green Chemical Process Ministry of Education Hubei Key Laboratory for Novel Reactor and Green Chemistry Technology Hubei Three Gorges Laboratory Hubei Engineering Research Center for Advanced Fine Chemicals School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Wuhan430205 China State Key Laboratory of Material Processing and Die and Mold Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing400714 China

Thin lithium metal anodes (LMAs) play a crucial role in realizing lithium metal batteries (LMBs) with high-energy-density. However, the commercial production of thin lithium anode continues to face challenges in manufacturing complexities, inadequate reversible capacity and unstable cyclability. Herein, we show a facile and effective strategy to produce ultra-thin LMAs with tunable thickness (10~50 μm), in which the Li-Ag alloy is in-situ formed and uniformly loaded on the cellulose-derived carbon supported reduced graphene oxide (CC-rGO). Density functional theory (DFT) calculations reveal that the Li-Ag alloy has strong adsorption energy and minimal energy barrier for Li diffusion, which can effectively meliorate Li transfer and homogeneous deposition. Due to the advantages of the synergistic effect of Li-Ag alloy modification, the elaborate-designed ultra-thin and 3D structure, the CC-rGO/LixAgy/Li anode facilitates the acceleration of Li-ion transport kinetics, reduce the nucleation barrier and offer adequate active sites, thereby improving the electrochemical characteristics. The CC-rGO/LixAgy/Li symmetric cell exhibits stably Li plating/stripping for 5000 h at 1 mA cm−2. When matched with LiFePO4 cathode, the full cell delivers remarkable cycling reversibility for 900 cycles at 3 C and the negative/positive capacity (N/P) ratio can be down to 1.18. More impressively, the pouch cell reveals an excellent flexibility with maintaining more than 80% capacity over 80 cycles at 0.3 C in folded states. This study provides a promising avenue to developing viable high-energy-density LMBs. © 2024, The Authors. All rights reserved.

关键词： Lithium alloys

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Ultrafast growth of high-quality large-sized GaSe crystals by liquid metal promoter

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Nano Research 2022年第5期15卷 4677-4681页

作者： Zuxin Chen Quan Chen Zebing Chai Bin Wei Jun Wang Yanping Liu Yumeng Shi Zhongchang Wang Jingbo Li Institute of semiconductors South China Normal UniversityGuangzhou 510631China School of Materials Sun Yat-Sen UniversityGuangzhou 510275China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430000China School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South University932 South Lushan RoadChangsha 410083China Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China International Iberian Nanotechnology Laboratory(INL) 4715–330 BragaPortugal

Growth of high-quality large-sized crystals using the traditional chemical vapor transport(CVT)or vertical Bridgman(VB)technique is costly and time-consuming,limiting its practical industrial ***,we propose an ultrafast crystal growth process with low energy consumption and capability of producing crystals of excellent quality,and demonstrate that large-sized GaSe crystals with a lateral size of 0.5 to 1 cm can be obtained within a short period of 5 min.X-ray diffraction(XRD)and scanning transmission electron microscopy(STEM)studies clearly indicate that the as-grown crystals have a good *** further show the potential application of the resulting GaSe crystals,we fabricate the few-layer GaSe-based photodetector,which exhibits low dark current of 21 pA and fast response of 34 ms under 405 nm *** proposed technique for rapid crystal growth could be further extended to other metallenes with low-melting point,such as Bi-,Sn-,In-,Pb-based crystals,opening up a new avenue in fulfilling diverse potential optoelectronics applications of two-dimensional(2D)crystals.

关键词： GaSe ultrafast growth photodetector liquid metal

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Low-Temperature Oxidative Removal of Formaldehyde Using Oxygen-Vacancy Enhanced Silver-Based Catalyst

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SSRN 2024年

作者： Yang, Xiaohang Hu, Huangcan Jin, Yun Luo, He'an Shen, Zhigang Jiang, Haibo Zhao, Bo Cheng, Xinquan Yang, Hongyun School of Chemical Engineering Xiangtan University Xiangtan411105 China Hunan Jiu Jiu Environmental Protect Technology Ltd. Changsha410000 China National & Local United Engineering Research Center for Chemical Process Simulation and Intensification Xiangtan University Xiangtan411105 China School of Material Science and Technology East China University of Science and Technology Shanghai200237 China Zhejiang TUNA Environmental Science & Technology Co. Ltd. Shaoxing312000 China

In this paper, a highly active silver-based catalyst, K-Ag/La-CeO2/Al2O3, was developed for low temperature formaldehyde oxidative removal based on oxygen vacancy theory, as an endeavor to bridge one of the gaps between the laboratory research and practical applications. Oxygen vacancies were generated by doping La2O3 into the CeO2 surface modification layer on an alumina support. They raised the fraction of Ag2O on CeO2 surface, reduced the activation energy from 111 to 74 kJ/mol, enabled the low temperature activity, and increased active sites for fast reaction. The catalyst demonstrated a decent adsorption capacity of 0.39 mmol HCHO/g_cat. in the presence of air at 25 ºC. It completely converted formaldehyde into CO2 and H2O at a temperature higher than 85 ºC and a residence time less than 0.1 second and achieved 4-10% formaldehyde conversion at 25 ºC. In situ DRIFTS suggested that formaldehyde combusted in the presence of the catalyst through a pathway with formic acid and CO as intermediate species. Besides formaldehyde oxidation, this catalyst design approach can also be applied to low temperature combustion of other volatile organic compounds. © 2024, The Authors. All rights reserved.

关键词： Formaldehyde

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Superhydrophilic and Underwater Superoleophobic Pvdf-Pes Nanofibrous Membranes for Highly Efficient Surfactant-Stabilized Oil-in-Water Emulsions Separation

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SSRN 2023年

作者： Li, Wangliang Yang, Yujie Huang, Enming Dansawad, Panchan Li, Yize Qing, Yashi Lv, Changzheng Cao, Lixia You, Siming Li, Yanxiang CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China Henan Pingyuan New Material Technology Co. Ltd. Fugou Henan Province Zhoukou461300 China James Watt School of Engineering University of Glasgow G12 8QQ United Kingdom

Deep oil-water emulsions separation is a challenging task for treating oily wastewater. Herein, a superwettable nanofibrous membrane was successfully fabricated using the integrated method of electrospinning, microwave-assisted growth, and in-situ polymerization. The membrane possessed superhydrophilicity and underwater superoleophobicity due to the presence of hierarchical rough structures and hydrophilic particles and polymers. The nanofibrous membrane exhibited robust oil-water separation performances for surfactant-free oil-in-water emulsions and different types of surfactant-stabilized emulsions (e.g., SDBS, CTAB and Tween80) solely under the effect of gravity. The membrane achieved a separation efficiency of >99.94% for surfactant-free oil-in-water emulsions with a flux of 3563.0 L m-2 h-1. The efficiency was above 98.90% with a flux of 1112.5 L m-2 h-1 for SDBS-stabilized oil-in-water emulsion solely under the effect of gravity. The membrane exhibited great long-term oil-water separation efficiencies above 97.0%. Moreover, the membrane showed remarkable stability and can maintain the underwater superoleophobicity under different harsh conditions, which is key for large-scale oily wastewater treatment applications. © 2023, The Authors. All rights reserved.

关键词： Membranes

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Effects of Oil Heat Treatment on Poplar Wood Properties: A Pilot Scale Study

SSRN

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SSRN 2024年

作者： Haseli, Maryam Efhamisisi, Davood Abdulkhani, Ali Oladi, Reza Ungerer, Bernhard Al-Musawi, Hajir Halmschlager, Erhard Müller, Ulrich Department of Wood and Paper Sciences and Technology Natural Resources Faculty College of Agriculture and Natural Resources University of Tehran Karaj Iran Department of Material Science and Process Engineering Institute of Wood Technology and Renewable Materials Konrad Lorenz-Strasse 24 Tulln an der Donau A-3430 Austria University of Natural Resources and Life Sciences Vienna Austria

Pilot-scale oil heat treatment was conducted to enhance the quality of poplar wood obtained from a fast-growing plantation. Three target temperatures, namely 180 ˚C, 190 ˚C, and 200 ˚C, were chosen for the oil heat treatment process. Clear, small specimens were cut from the lumber, following the prescribed standards for assessing wood quality. Light microscopy revealed the ruptures and deformation of the wood cell wall as the treatment temperature increased. The volumetric swelling of the treated specimen decreased proportionally with the increase in treatment temperature. The impact of oil heat treatment on the mechanical properties of wood varied depending on the specific type of mechanical strength and processing temperature. The modulus of rupture, fracture toughness, and hardness of the treated specimens drastically decreased at 200˚C. However, the specimens treated at 200˚C exhibited much lower mass loss during the fugal decay test. The results of the analytical test showed an increase in the crystalline cellulose content and thermal stability of the treated wood, due to the thermal degradation of hemicelluloses and amorphous regions of cellulose. Overall, it is concluded that oil heat treatment of poplar wood in the optimal temperature is an efficient approach to upgrade its quality with minimal reduction in mechanical strength. © 2024, The Authors. All rights reserved.

关键词： Soybean oil

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Design and analysis of ultra-large capacity heterogeneous nineteen-core seven-mode fiber

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Optik 2023年 292卷

作者： Shao, Pengshuai Ma, Liling Li, Zenghui Li, Shuguang Cheng, Tonglei Liu, Zhixue State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province School of Science Yanshan University Qinhuangdao066004 China State Key Laboratory of Synthetical Automation for Process Industries College of Information Science and Engineering Northeastern University Shenyang110819 China

The multi-core few-mode fiber based on space division multiplexing technology is one of the critical ways to address the issue that the current single-mode fiber communication capacity has reached its maximum. However, the energy crosstalk between the cores is an important reason for the deterioration of signal quality. Consequently, this paper designs a nineteen-core seven-mode fiber with more transmission channels, and the auxiliary structures such as trench, high and low refractive index double rings, and air holes can effectively reduce intra-core crosstalk and inter-core crosstalk. After optimization, each core of the nineteen-core fiber can transmit seven LP modes, and the effective refractive index difference between adjacent modes is greater than or equal to 10−3. The optical fiber provides 228 transmission channels for the entire transmission system, the inter-core crosstalk of the highest order LP41 mode is lower than −30 dB/100 km at 1550 nm. Based on the above, the proposed optical fiber has excellent optical properties and can be applied to data centers, optical sensors, high-speed computer communication networks, and other applications. © 2023 Elsevier GmbH

关键词： Refractive index

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Unraveling the Dynamic Redox Behavior of Pd Species in Pdox/Sno2 Hybrids: A Key to Superior Low-Temperature Gas Sensing

SSRN

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SSRN 2024年

作者： Gao, Jian Li, Mengmeng Jin, Shuge Guo, Meiyuan Jiang, Suyu Ma, Wei Song, Chunshan National Key Laboratory of Coking Coal Green Process Research Zhengzhou University Zhengzhou450001 China Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education School of Chemical Engineering Zhengzhou University Zhengzhou450001 China Department of Chemistry Faculty of Science The Chinese University of Hong Kong Shatin Hong Kong Dalian University of Technology China

Operando characterization techniques reveal the dynamic interplay of Pd species and gas sensing activity in a PdOx/SnO2 hybrid material for low-temperature CO detection. We demonstrated that Pd species exhibited a dynamic redox behavior, transitioning between various oxidation states and serving as active sites for CO adsorption and subsequent spillover-mediated oxidation. The formation of a p-n junction at the PdOx/SnO2 interface drove oxygen anion (O2-, O-) enrichment around Pd islands, enhancing CO adsorption and facilitating rapid CO2 formation. This resulted in electron injection into the SnO2 depletion layer, leading to a significant enhancement of the sensing response even at temperatures as low as 50°C. Our findings provided profound insights into the dynamic behavior of Pd species and its influence on gas sensing performance, offering a valuable strategy for designing advanced low-temperature CO sensors with enhanced sensitivity, selectivity, and operational stability. © 2024, The Authors. All rights reserved.

关键词： Chemical sensors

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Halogen atom-induced local asymmetric electron in covalent organic frameworks boosts photosynthesis of hydrogen peroxide from water and air

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Matter 2025年第5期8卷

作者： Liu, Youxing Guo, Yaru Sathishkumar, Nadaraj Liu, Minghui Li, Lu Sang, Zhiyuan Feng, Rongjuan Sun, Zongqiang Sun, Chenglong Luo, Mingchuan Deng, Xuliang Lu, Gang Guo, Shaojun School of Materials Science and Engineering Peking University Beijing100871 China Beijing Key Laboratory of Electrochemical Process and Technology for Materials Beijing University of Chemical Technology Beijing100029 China Department of Geriatric Dentistry NMPA Key Laboratory for Dental Materials National Engineering Laboratory for Digital and Material Technology of Stomatology Beijing Laboratory of Biomedical Materials Peking University School and Hospital of Stomatology Beijing100081 China Department of Physics and Astronomy California State University NorthridgeCA91330 United States Institute of Chemistry Chinese Academy of Sciences Beijing100049 China

The solar-to-chemical conversion (SCC) efficiency of hydrogen peroxide (H2O2) photosynthesis is governed by the O2 adsorption model and energy level, which are experimentally challenging to be tuned. Herein, we report a new strategy for tuning of the O2 adsorption and electron potential energy level of covalent organic frameworks (COFs) using halogen atom (F, Cl, Br, and I) as a regulatory reagent, and demonstrate that I-COFs exhibit the maximum thermodynamic driving force for 2e– oxygen reduction reaction (ORR). The introduction of I atom inhibits the O–O bond breakage for enhancing the selectivity of 2e– ORR from 56.5% to 87.0%, thus promoting the continuous natural sunlight-driven photosynthesis of H2O2 directly from water and air, showing a high SCC efficiency of 1.88% and the operational stability of over 200 h. Meanwhile, I-COFs also show 100% antibacterial performance and efficient wound healing ability, which is significantly better than that of H-COFs with symmetric electron distribution. © 2025 Elsevier Inc.

关键词： Electrolytic reduction

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Efficiency of Unmodified Recycled Polyethylene Terephthalate (Rpet) Nanofibrous Membrane for Water-in-Oil and Oil-in-Water Emulsions Separation

SSRN

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SSRN 2024年

作者： Dansawad, Panchan Li, Yanxiang Cao, Lixia Gao, Haigang Yang, Chaoyong Huang, Enming You, Siming Li, Wangliang CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China James Watt School of Engineering University of Glasgow GlasgowG12 8QQ United Kingdom Technology Development Co. Ltd. Building 3 2nd Floor Hengtong Business Park Jiuxianqiao Road Chaoyang District Beijing China Henan Pingyuan New Material Technology Co. Ltd. Fugou Henan Zhoukou461300 China

A nanofibrous membrane made of unmodified recycled polyethylene terephthalate (rPET) was fabricated by electrospinning using plastic water bottle waste as raw materials. Using rPET polymer to fabricate membranes may help limit the discharge of plastic bottle waste into the environment and can treat oily wastewater simultaneously, especially emulsions. The variation in the concentration of rPET polymer and the properties of electrospun nanofibers, such as surface morphology and fiber diameter, had a significant impact on both the efficiency of oil droplet capturing and the surface wettability of the membrane. Water-in-oil emulsions and oil-in-water emulsions were separated using the nanofibrous membranes of different concentrations of rPET polymer, and the separation efficiencies at different concentrations of oil, flow rates, and oil types were measured. The rPET nanofibrous membrane exhibited a water contact angle of 140.1° and was superoleophilic in air and water. The membranes exhibited excellent separation performances: >98% separation efficiency and a flow rate of more than 6500 Lm-2h-1;>95% efficiency and a flow rate of 1509.70 Lm-2h-1 after three separation cycles of water-in-oil emulsions. For oil-in-water emulsions, the separation efficiencies were higher than 95%, with an efficiency of >87.9% after three separation cycles. However, as water accumulated on the membrane surface, absorption and separation efficiency and flux were lowered significantly. This suggests the need to enhance the efficiency of the membrane and reduce the chance of water accumulation on the membrane surface. © 2024, The Authors. All rights reserved.

关键词： Efficiency

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