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International Conference on Fundamental and Industrial Research on materials, iConFIRM 2023

作者： Godbole, Kirtiratan Mondal, K. Department of Applied Mechanics Motilal Nehru National Institute of Technology Allahabad Prayagraj211004 India Department of Materials Science and Engineering Indian Institute of Technology Kanpur Kanpur208016 India

ISBN: (纸本)9789819745562

Rail steels are high-carbon steels with a predominantly pearlitic microstructure that are commonly utilized in locomotive tyres and big forging dies. The study looks at how salinity, conductivity, total dissolved solids (TDS), and pH affect the corrosion of high-carbon pearlitic rail steel. The research includes pearlitic steels with coarse, fine, and very fine microstructures produced by furnace-cooled, air-cooled, and forced-cooled processes, as well as bainite, martensite, and tempered martensite produced by austempering, water quenching, and tempering of quenched steel, respectively. The research also looks at how water characteristics affect the composition, fractionation, and morphology of corrosion products. In general, salinity and conductivity rise as pH decreases over time. However, the increased TDS and protective index (α/γ*) as measured by the weight fraction of stable α-FeOOH over the other unstable γ-FeOOH and β-FeOOH rust phases eventually induce enhanced corrosion resistance to the steels regardless of their microstructure and interlamellar spacing between ferrite (α-Fe) and cementite (Fe3C). In all situations, air-cooled steel with fine pearlite outperforms furnace-annealed and forced-air-cooled steels. Furthermore, the bainitic microstructure steel is more corrosion resistant than the martensite and tempered martensite microstructure steels. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Martensite

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Bilayer Self-Folding Method with High Folding Force and Angle by Suppressing Delamination of Shrink Layer 22

Bilayer Self-Folding Method with High Folding Force and Angl...

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22nd International Conference on Solid-State Sensors, Actuators and Microsystems, Transducers 2023

作者： Sato, Yusuke Sato, Takashi Iwase, Eiji Waseda University Department Of Applied Mechanics And Aerospace Engineering Tokyo Japan Waseda University Department Of Materials Science Tokyo Japan Waseda University Kagami Memorial Research Institute For Materials Science And Technology Tokyo Japan

ISBN: (纸本)9784886864352

We proposed a self-folding method using a mechanical fixing mechanism for polyolefin, which is known as a heat-shrinkable and difficult adhesive material, and we realized high folding force and high folding angle. By using the mechanical fixing mechanism from the outside with holes and adhesives in the shrinkage layer, the proposed self-folding method allows a higher folding angle than the conventional fixing method using only an adhesive layer. Finally, we demonstrated the extensibility of the proposed method by self-folding various origami structures. © 2023 IEEJ.

关键词： Adhesion Mechanical fixing Origami Polyolefin Self-folding

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Strengthening Mechanisms of 15 vol.% Al_(2)O_(3) Nanoparticles Reinforced Aluminum Matrix Nanocomposite Fabricated by High Energy Ball Milling and Vacuum Hot Pressing

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Acta Metallurgica Sinica(English Letters) 2022年第6期35卷 915-921页

作者： Ke Zhao Zhongying Duan Jinling Liu Guozheng Kang Linan An School of Mechanics and Engineering Southwest Jiaotong UniversityChengdu 610031China Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province Southwest Jiaotong UniversityChengdu 610031China Department of Materials Science and Engineering University of Central FloridaOrlandoFL 32816USA

Increasing nanoparticle volume fraction has been proved to be effective in improving the strength of nanoparticle reinforced Al matrix nanocomposite. However, the underlying mechanisms for the ultrahigh strength of those nanocomposites with high volume fraction(> 10 vol.%) nanoparticles are short of experimental research. In this study, the strengthening mechanisms of high strength Al matrix nanocomposite reinforced with 15 vol.% Al_(2)O_(3) nanoparticles were investigated experimentally and analyzed theoretically. The results show that the thermal mismatch induced geometrically necessary dislocations exhibit a negligible strengthening effect, because of their low density in the nanocomposite that is contradiction to the conventional dislocation punch model. Orowan mechanism makes a major strengthening contribution in view of the deformation process dominated by nanoparticle-dislocation interactions due to the extreme pinning effect of nanoparticles on dislocation motion. In addition, the several mechanisms including grain boundary strengthening, load transfer strengthening, and elastic modulus mismatch induced dislocation strengthening contribute to the strength increase.

关键词： Al matrix nanocomposite Strengthening mechanism Nanoparticle High volume fraction Microstructure

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ESTIMATION OF MOISTURE DISTRIBUTION IN SAWN TIMBER USING COMPUTED TOMOGRAPHY 13

ESTIMATION OF MOISTURE DISTRIBUTION IN SAWN TIMBER USING COM...

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13th World Conference on Timber engineering: Timber for a Livable Future, WCTE 2023

作者： Poupet, Boris Couceiro, José Florisson, Sara Hansson, Lars Sandberg, Dick Division of Wood Science and Engineering Department of Engineering Sciences and Mathematics Luleå University of Technology Sweden Department of Materials Science and Engineering Division of Applied Mechanics Uppsala University Sweden Department of Ocean Operations and Civil Engineering Faculty of Engineering Norwegian University of Science and Technology Ålesund6025 Norway

ISBN: (纸本)9781713873297

Most of the physical, mechanical, and esthetic properties of wood products are affected by the drying of sawn timber. A better understanding of moisture transport in wood during kiln drying is necessary to obtain better quality products, shorter drying schedules, lower energy consumption, and a more sustainable process. Four-dimensional X-ray computed tomography (4DCT) (three-dimensional in space and one in time) with image processing techniques can be used to study the moisture content (MC) of sawn timber during kiln drying. The development of the technique is however made difficult by computational complexity and a lack of accurate experimental validation. In this study, a method relying on 4DCT has been developed using state-of-the-art image processing techniques. The method was validated by a regression analysis of the predicted MC against gravimetric measurements for different timber cross sections and different initial MC distributions on a significantly smaller scale than has previously been investigated. It is concluded that the MC can be estimated with an average uncertainty of ±4.8 percentage points on a 10 mm scale. Sawmills could ultimately benefit from a better understanding of wood-water interactions and dry sawn timber more efficiently. © (2023) WORLD CONFERENCE ON TIMBER engineering 2023 (WCTE 2023) All rights reserved.

关键词： Moisture

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Synthesis of coral-like structures of Pr-Yb co-doped YIG: Structural,optical, magnetic and antimicrobial properties

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Journal of Rare Earths 2024年第3期42卷 543-554,I0004页

作者： A.Fernandez Francisca P.Araujo Y.Guerra S.Castro-Lopes J.Matilla-Arias Idglan S.de Lima Edson C.Silva-Filho Josy A.Osajima F.Guerrero R.Pena-Garcia Federal University of Piau Graduate Program in Materials Science and EngineeringTeresinaPIBrazil Federal Rural University of Pernambuco Academic Unit of Cabo de Santo AgostinhoCabo de Santo AgostinhoPEBrazil Federal University of Piaui Department of PhysicTeresinaPBrazil Federal University of Pernambuco Graduate Program in Materials ScienceRecifePEBrazil University of Granma Departmentof Basic Sciences and Applied InformaticsFaculty of Technical SciencesBayamoCuba Federal University of Amazonas Department of PhysicManausAMBrazil Federal University of Pernambuco Department of PhysicRecifePEBrazil

Coral-like structures of the Y_(3-x)Pr_(x)Fe_(5-y)Yb_(y)O_(12),(0.00 ≤ x ≤ 0.04, 0.00 ≤ y ≤ 0.02) compound were synthesized using the sol-gel method. Structural investigation certified the YIG cubic crystal structure formation, without any secondary phase. It is shown that, the relatively large ionic radius of the dopant cations results in an expansion of the lattice parameter, variations in the Iona-O-Iondangle, Iona-O,Iond-O and Ionc-O bond distances and decrease in the average crystallite size. Fourier transform infrared(FTIR) and Raman measurements are essential to testify the single-phase formation of YIG crystal structure and are observed changes in the stretching and vibrational modes, respectively. The morphological study, energy dispersive spectroscopy(EDS) spectra and textural properties show corallike structures, peaks associated with Pr^(3+) and Yb^(3+) atoms and the effect of dopants on surface area,diameter, and pore volume, respectively. The optical analysis from diffuse reflectance spectra witnessed an increase in the optical gap band, a decrease in Urbach energy and blue shift in the charge transfer,correlated with the expansion of the unit cell due to the dopant's insertion in the YIG structure. A typical ferrimagnetic behavior is exhibited by the Y_(3-x)Pr_(x)Fe_(5-y)Yb_(y)O_(12)compound. The saturation magnetization(M_(s)), cubic anisotropy constant(K_(1)) and coercive field(H_(c)) increase with the Pr^(3+)cations content, as consequence of their magnetic nature and distribution around of Fe^(3+)ions due to the coexistence with the Yb^(3+). Finally, for the first time, antibacterial tests by mean of the direct contact method were performed for YIG co-doped with Pr^(3+)and Yb^(3+)and it is shown that, relatively high dosages of Pr^(3+) cations favored the activity against S. aureus, therefore, a new biological property for YIG doped with rare earths is presented.

关键词： Yttrium iron garnet(YIG) Coral-like structures Rare earths Band gap energy Magnetic properties Antimicrobial properties

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Steric effect induces enhancement of electroconvective flow near electrochemical interfaces

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Physical Review E 2024年第3期110卷 035101页

作者： Qing Chen Hehua Zhu Peng Wang Wei Liu Key Laboratory of Advanced Civil Engineering Materials School of Materials Science and Engineering State Key Laboratory for Disaster Reduction in Civil Engineering Key Laboratory of Textile Science & Technology of Ministry of Education College of Textiles School of Aerospace Engineering and Applied Mechanics Department of Engineering Mechanics

Electroconvection, occurring near electrochemical interfaces, propels the movement of ions and water, leading to intricate phenomena rooted in the fine interplay between fluid, voltage, and ion. Here, neglecting ionic interactions, by incorporating the steric term into the Poisson-Nernst-Planck-Stokes coupling equation, direct numerical simulations of electroconvective vortex near nanoslot-bulk interfaces are conducted. For the steric effect, the steric number is introduced to discuss the factors and laws affecting the vortex. We illustrate the substantial enhancement of electroconvective vortex due to the steric effect of ions within the nanoslot. Upon increasing the steric number, the cation concentration in the nanoslot is enhanced, resulting in the expansion of the electric double layer (EDL). The EDLs on the walls inside the nanoslot come into contact with each other, causing the EDLs to overlap, consequently increasing the total charge within the EDLs inside the nanoslot. This EDL overlap enhances the charge density of the extended space charge layer, leading to the enhancement of the electroconvective vortex. Further, our scaling analysis, corroborated by direct numerical simulation and existing data, establishes the scaling of slip velocity, jointly regulated by the steric number and voltage difference. By modulating the membrane transport characteristics, the steric effect reduces flow structure size and flux fluctuations, which offers new perspectives for manipulating ion transport and flow instability.

关键词： Pattern formation Transport phenomena Ionic fluids Soft colloids Scaling methods

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Output Characteristics on Kirigami Thermoelectric Generator by Three-Dimensional Deformation and Geometric Shapes 22

Output Characteristics on Kirigami Thermoelectric Generator ...

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22nd International Conference on Solid-State Sensors, Actuators and Microsystems, Transducers 2023

作者： Terashima, Shingo Iwase, Eiji Waseda University Department Of Applied Mechanics And Aerospace Engineering Tokyo Japan Waseda University Kagami Memorial Research Institute For Materials Science And Technology Tokyo Japan

ISBN: (纸本)9784886864352

We have evaluated the output characteristics of a flexible thermoelectric generator (TEG) with high output power by a kirigami structure. The feature of the kirigami structure is that the low-temperature side substrate and the thermoelectric (TE) element standing-up in the height direction (the direction away from the heat source). Therefore, we investigated the effects of (i) three-dimensional standing-up deformation of the kirigami-TEG and (ii) the aspect ratio of TE elements, and () the width of the low-temperature side substrate on output characteristics. © 2023 IEEJ.

关键词： Flexible device Kirigami Stretchable device Thermoelectric generator

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Effect of Polymer Network Morphology on the Performance of Polymer Dispersed Liquid Crystal (PDLC) Composite Films

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Journal of Wuhan University of Technology(materials science) 2022年第5期37卷 1020-1024页

作者： SHEN Jiyuan LIN Haonan REN Yunxiao SUN Chang BAO Jinying XIAO Jiumei GAO Yanzi Department of Applied Mechanics University of Sciences and Technology BeijingBeijing100083China Department of Materials Physics and Chemistry School of Materials Science and EngineeringUniversity of Sciences and Technology BeijingBeijing100083China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing100083China Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Advanced Materials and Technology University of Sciences and Technology BeijingBeijing100083China

The effects of the morphologies of liquid crystal (LC) droplets left in polymer network on the performance of polymer dispersed liquid crystal composite films were *** adjusting the relative content range of the crosslinking and diluents,the morphologies of polymer network can be ***,the properties of PDLC composite films with imparity polymer morphologies were obtained by experiments and the finite element *** of the experimental and finite element simulation showed that the electro-optical properties of PDLC composite films were inversely proportional to the domain size of the polymer network and the mechanical properties were proportional to the domain size of the polymer network.

关键词： polymer dispersed liquid crystals polymer network morphology finite element simulation mechanical properties electro-optical properties

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Self-Healing Metal Interconnect Using Silicone oil Dispersed with Copper Nanoparticles 22

Self-Healing Metal Interconnect Using Silicone oil Dispersed...

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22nd International Conference on Solid-State Sensors, Actuators and Microsystems, Transducers 2023

作者： Umeda, Akane Suetsugu, Naoki Akema, Wakana Iwase, Eiji Waseda University Department Of Applied Mechanics And Aerospace Engineering Tokyo Japan Waseda University Kagami Memorial Research Institute For Materials Science And Technology Tokyo Japan

ISBN: (纸本)9784886864352

We achieved a self-healing metal interconnect using low-volatility liquid silicone oil as a dispersant and copper nanoparticles as metal nanoparticles. We clarified that we have to distinguish between physical bridging and electrical connection because of an oxide layer of copper nanoparticles when silicone oil dispersed with copper nanoparticles is used in self-healing metal interconnects. As a result, we have successfully classified self-healing types depending on the applied voltage and the energy of Joule heating. © 2023 IEEJ.

关键词： Bridging Copper nanoparticles Electrical connecting Self-healing metal interconnect Silicone oil

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Evaluation Method of Out-of-Plane Deformation on Kirigami Structure with Repetitive Slit Patterns on Concentric Circles 22

Evaluation Method of Out-of-Plane Deformation on Kirigami St...

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22nd International Conference on Solid-State Sensors, Actuators and Microsystems, Transducers 2023

作者： Mizuna, Miyako Iwase, Eiji Waseda University Department Of Applied Mechanics And Aerospace Engineering Tokyo Japan Waseda University Kagami Memorial Research Institute For Materials Science And Technology Tokyo Japan

ISBN: (纸本)9784886864352

We proposed an evaluation method and quantitative index for the radial distribution of out-of-plane deformation of kirigami structures with a slit pattern on concentric circles. The concentric kirigami structure is deformed into the out-of-plane direction by pulling the center of the structure, and the out-of-plane deformation distribution in the radial direction can be changed by changing the parameters. In this paper, we expressed the radial distribution of this out-of-plane deformation using a single quantitative index. If the design of the kirigami structure can be freely determined from the quantification index, it can contribute greatly to the realization of useful Micro-Electro-Mechanical Systems (MEMS) devices. © 2023 IEEJ.

关键词： Concentric circles Distribution Kirigami structure Out-of-plane deformation Slit pattern

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