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International Conference on Renewable Energy and E-mobility, ICREEM 2022

作者： Liaw, Kim Leong Rosle, Amir Farid Haziq bin Hendarti, Religiana Kurnia, Jundika Candra Mechanical Engineering Department Universiti Teknologi PETRONAS Perak Darul Ridzuan Malaysia Department of Mining and Materials Engineering McGill University MontrealQuebec Canada Architecture Department Faculty of Engineering Bina Nusantara University Jakarta Indonesia Department of Mechanical Engineering Faculty of Engineering and Science Curtin University Sarawak Malaysia

ISBN: (纸本)9789819959457

Heat sink is an essential part in the cooling system for electronic operation specifically Central Processing Unit. Various enhancement methods which include metal foam have been studied to improve cooling performance. This study aims to analyze the forced convection of 10 PPI cooper metal foam with various shapes of pin fin (square, triangular, circular, and no-pin) heat sink under dielectric coolant in a range of Reynolds number (Re = 100, 500, 1000, 1500) at heat flux, q, of 100 kW/m2. In addition, partial filled metal foam (PFMF) design is implemented to optimize the overall performance of the heat sink as compared to fully filled metal foam (FFMF) design. This numerical study is conducted by developing a 3D model in ANSYS, where accuracy is confirmed through grid independence test and validation. Result shows that the triangular pins model is having highest performance in FFMF while square pins model is the best in PFMF after considering both heat transfer and pressure drop. The reduction of metal foam decreases the friction factor, while drastically decreasing the heat transfer rate of triangular pins and no-pin models. This study serves as a new heat sink design by combining pin and metal foam for augmentation of heat transfer performance in electronic cooling system. © Institute of Technology PETRONAS Sdn Bhd (Universiti Teknologi PETRONAS) 2024.

关键词： Electronic cooling

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Effect of die coating on surface crack depth of hot extruded 7075 aluminum alloy

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Friction 2023年第7期11卷 1212-1224页

作者： Tatsuya FUNAZUKA Kuniaki DOHDA Norio TAKATSUJI Chengliang HU Ngernbamrung SUKUNTHAKAN Faculty of Engineering University of ToyamaToyama 9308555Japan Department of Mechanical Engineering Northwestern UniversityEvanston 60201USA Institute of Forming Technology&Equipment School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200030China Metal and Manufacturing Process Research Group National Metal and Materials Technology CenterPathumthani 12120Thailand

The aluminum alloys belonging to the 7000 series are high-strength alloys used in a wide variety of products for weight *** are primarily used in the field of transportation and *** these,the A7075 alloy has the highest strength and is expected to be applicable in a wide range of fields,such as aircraft components and sports ***,it has high deformation resistance and is prone to surface defects,which is called *** typically occurs at high temperatures and high ram speeds,and adversely affects *** localized melting of Zn and additive compounds,due to the heat generated during the process,is considered to cause *** this study,the effect of friction,heat,and tearing at the tool-metal interface was mitigated by improving the die surface *** reduced friction eliminated recrystallization by preventing the temperature from increasing to recrystallization *** addition,an AlCrN coating was adopted instead of nitriding to improve the die surface *** tearing size and heat generated when using the AlCrN coating were found to be ***,the grain size observed in the tearing region on the extruded surface was *** simulations using the shear friction coefficient m observed from friction tests indicate that the use of the AlCrN coating improved the material ***,the AlCrN coating is considered effective for reducing friction at the interface and preventing the recrystallization of the extruded *** the aforementioned results,it can be inferred that a die coating can reduce the tearing sensitivity and increase the productivity of the A7075 alloy.

关键词： hot extrusion 7075 aluminum alloy die coating tearing

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High strength mullite-bond SiC porous ceramics fabricated by digital light processing

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Journal of Advanced Ceramics 2024年第1期13卷 53-62页

作者： Jian Sun Jingde Zhang Xu Zhang Zihe Li Jianzhang Li Sijie Wei Weibin Zhang Weili Wang Guifang Han Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China Key Laboratory of Special Functional Aggregated Materials Ministry of EducationShandong UniversityJinan 250100China Materials and Structures Research Centre Department of Mechanical EngineeringUniversity of BathBath BA27AYUK National Engineering Research Centre of Ceramic Matrix Composite Manufacture Technology Xi’an Golden Mountain Ceramic Composites Co.Ltd.Xi’an 710118China School of Physics and Materials Science Changji UniversityChangji 831100China

Fabricating SiC ceramics via the digital light processing(DLP)technology is of great challenge due to strong light absorption and high refractive index of deep-colored SiC powders,which highly differ from those of resin,and thus significantly affect the curing performance of the photosensitive SiC *** this paper,a thin silicon oxide(SiO_(2))layer was in-situ formed on the surface of SiC powders by pre-oxidation *** method was proven to effectively improve the curing ability of SiC *** SiC photosensitive slurry was fabricated with solid content of 55 vol%and viscosity of 7.77 Pa·s(shear rate of 30 s^(−1)).The curing thickness was 50μm with exposure time of only 5 ***,a well-designed sintering additive was added to completely convert low-strength SiO_(2) into mullite reinforcement during *** mullite-bond SiC ceramics were successfully *** flexural strength of SiC ceramics sintered at 1550℃in air reached 97.6 MPa with porosity of 39.2 vol%,as high as those prepared by spark plasma sintering(SPS)techniques.

关键词： digital light processing(DLP) SiC ceramics pre-oxidation mullite-bond SiC mechanical properties

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Ab initio uncertainty quantification in scattering analysis of microscopy

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Physical Review E 2024年第3期110卷 034601页

作者： Mengyang Gu Yue He Xubo Liu Yimin Luo Department of Statistics and Applied Probability Department of Mechanical Engineering and Materials Science

Estimating parameters from data is a fundamental problem in physics, customarily done by minimizing a loss function between a model and observed statistics. In scattering-based analysis, it is common to work in the reciprocal space. Researchers often employ their domain expertise to select a specific range of wave vectors for analysis, a choice that can vary depending on the specific case. We introduce another paradigm that defines a probabilistic generative model from the beginning of data processing and propagates the uncertainty for parameter estimation, termed the ab initio uncertainty quantification (AIUQ). As an illustrative example, we demonstrate this approach with differential dynamic microscopy (DDM) that extracts dynamical information through minimizing a loss function for the squared differences of the Fourier-transformed intensities, at a selected range of wave vectors. We first show that the conventional way of estimation in DDM is equivalent to fitting a temporal variogram in the reciprocal space using a latent factor model as the generative model. Then we derive the maximum marginal likelihood estimator, which optimally weighs the information at all wave vectors, therefore eliminating the need to select the range of wave vectors. Furthermore, we substantially reduce the computational cost of computing the likelihood function without approximation, by utilizing the generalized Schur algorithm for Toeplitz covariances. Simulated studies of a wide range of dynamical systems validate that the AIUQ method improves estimation accuracy and enables model selection with automated analysis. The utility of AIUQ is also demonstrated by three distinct sets of experiments: first in an isotropic Newtonian fluid, pushing limits of optically dense systems compared to multiple particle tracking; next in a system undergoing a sol-gel transition, automating the determination of gelling points and critical exponent; and lastly, in discerning anisotropic diffusive behavio

关键词： Applications of soft matter Complex systems Noise Random walks Colloids Liquid crystals Stochastic dynamical systems Brownian dynamics Data analysis Light scattering Machine learning Optical microscopy Sol-gel process Statistical methods

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Recyclability and Self-Healing of Dynamic Cross-Linked Polyimide with mechanical/Electrical Damage

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Energy & Environmental materials 2023年第1期6卷 401-407页

作者： Baoquan Wan Ming-Sheng Zheng Xing Yang Xiaodi Dong Yuchao Li Yiu-Wing Mai George Chen Jun-Wei Zha School of Chemistry and Biological Engineering University of Science and Technology BeijingBeijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing 100083China Shunde Graduate School of University of Science and Technology Beijing Foshan 528300China School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252059China Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronic EngineeringThe University of SydneySydney New South Wales 2006Australia Department of Electronics and Computer Science University of SouthamptonSouthampton SO171BJUK

Recyclability and self-healing are two most critical factors in developing sustainable polymers to deal with environmental pollution and resource *** this work,a dynamic cross-linked polyimide insulation film with full closed-loop recyclability is successfully prepared,which also possesses good self-healing ability after being mechanical/electrical damaged depending on the Schiff base dynamic covalent *** recycled and self-healed polyimide film still maintain its good tensile strength(r t)>60 MPa with Young’s modulus(E)>4 GPa,high thermal stability with glass transition temperature(T g)>220℃,and outstanding insulation property with breakdown strength(E 0)>358 kV mm^(-1),making it a very promising low energy consumption and high temperature resistant insulation *** strategy of using Schiff base dynamic covalent bonds for reversible repairing the structure of high T g polyimides promotes the wider application of such sustainable and recyclable material in the field of electrical power and micro-electronics.

关键词： electrical damage polyimide recyclability self-healing

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Recent advances in machine learning-assisted fatigue life prediction of additive manufactured metallic materials:A review

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Journal of materials science & Technology 2024年第31期198卷 111-136页

作者： H.Wang S.L.Gao B.T.Wang Y.T.Ma Z.J.Guo K.Zhang Y.Yang X.Z.Yue J.Hou H.J.Huang G.P.Xu S.J.Li A.H.Feng C.Y.Teng A.J.Huang L.-C.Zhang D.L.Chen Interdisciplinary Centre for Additive Manufacturing(ICAM) School of Materials and ChemistryUniversity of Shanghai for Science and TechnologyShanghai 200093China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Tongji UniversityShanghai 201804China AVIC Aero-Polytechnology Establishment Beijing 100028China Department of Material Science and Engineering Monash UniversityClaytonVIC 3800Australia School of Engineering Edith Cowan UniversityPerthWA 6027Australia Department of Mechanical and Industrial Engineering Toronto Metropolitan University(formerly Ryerson University)TorontoOntario M5B 2K3Canada

Additive manufacturing features rapid production of complicated shapes and has been widely employed in biomedical,aeronautical and aerospace ***,additive manufactured parts generally exhibit deteriorated fatigue resistance due to the presence of random defects and anisotropy,and the prediction of fatigue properties remains *** this paper,recent advances in fatigue life prediction of additive manufactured metallic alloys via machine learning models are *** on artificial neural network,support vector machine,random forest,etc.,a number of models on various systems were proposed to reveal the relationships between fatigue life/strength and defect/microstructure/*** the success,the predictability of the models is limited by the amount and quality of ***,the supervision of physical models is pivotal,and machine learning models can be well enhanced with appropriate physical ***,future challenges and directions for the fatigue property prediction of additive manufactured parts are discussed.

关键词： Fatigue Additive manufacturing Metallic alloys Machine learning

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Laser additive manufacturing for infrastructure repair:A case study of a deteriorated steel bridge beam

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Journal of materials science & Technology 2023年第23期154卷 149-158页

作者： Shengbiao Zhang Peijun Hou Jiyun Kang Tianyi Li Shahryar Mooraj Yang Ren Catherine H.Chen A.John Hart Simos Gerasimidis Wen Chen Department of Mechanical and Industrial Engineering University of Massachusetts Amherst MA 01003 USA Department of Civil and Environmental Engineering University of Massachusetts Amherst MA 01003 SA Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA X-ray Science Division Argonne National Laboratory Lemont IL 60439 USA Massachusetts Department of Transportation Boston MA 02116 USA Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA Department of Physics City University of Hong Kong Kowloon Hong Kong China

As our transportation infrastructure ages,its deterioration is becoming a growing *** and effective methods for repair can reduce the need for time-and cost-intensive replacement of structures such as roadway *** this work,laser-based additive manufacturing(AM)was developed for the repair of damaged beams in steel bridges.A corroded structural beam of low-carbon A36 steel was selected for this case study and 316L stainless steel was used for repair due to its excellent mechanical properties and corrosion *** repair experiments were performed on specimens extracted from the beam,and prepared with various groove shapes(Rectangular,Trapezoidal,and U-shaped).More in-depth parametric and microstructural studies were carried out with a series of U-shaped specimens repaired with the linear laser input energy varied from 19.5 to 30.0 J mm–*** tensile properties of the repaired specimens and interface structures were also investigated in *** was found that the repaired specimens had a slightly higher tensile strength despite a reduction in tensile elongation compared to the A36 steel base *** influence of interfacial microstructure and heterogeneity on the mechanical properties of the repaired specimens was *** work suggests the promising potential to employ AM for structural repair and provides fundamental insights into processing-structure-property relationships in laser AM-repaired materials.

关键词： Additive manufacturing Structural repair mechanical properties Transportation infrastructure Dissimilar joint

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mechanical properties of Al-15Mg_(2)Si composites prepared under different solidification cooling rates

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International Journal of Minerals,Metallurgy and materials 2022年第6期29卷 1249-1260页

作者： E.Safary R.Taghiabadi M.H.Ghoncheh Department of Materials Science and Metallurgy Imam Khomeini International UniversityQazvinIran Department of Mechanical Engineering University of New BrunswickFrederictonNBCanada

The effect of different cooling rates(2.7,5.5,17.1,and 57.5℃/s)on the solidification parameters,microstructure,and mechanical properties of Al-15Mg_(2)Si composites was *** results showed that a high cooling rate refined the Mg_(2)Si particles and changed their morphology to more compacted forms with less microcracking *** average radius and fraction of primary Mg_(2)Si particles decreased from 20μm and 13.5%to about 10μm and 7.3%,respectively,as the cooling rate increased from 2.7 to 57.5℃/*** the cooling rate also improved the distribution of microconstituents and decreased the grain size and volume fraction of *** mechanical properties results revealed that augmenting the cooling rate from 2.7 to about 57.5℃/s increased the hardness and quality index by 25%and245%,*** high cooling rate also changed the fracture mechanism from a brittle-dominated mode to a high-energy ductile mode comprising extensive dimpled zones.

关键词： Al-15Mg_(2)Si composite solidification cooling rate thermal analysis mechanical properties

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Real-time monitoring of fast gas dynamics with a single-molecule resolution by frequency-comb-referenced plasmonic phase spectroscopy

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PhotoniX 2024年第1期5卷 357-372页

作者： Duy-Anh Nguyen Dae Hee Kim Geon Ho Lee San Kim Dong-Chel Shin Jongkyoon Park Hak-Jong Choi Seung-Woo Kim Seungchul Kim Young-Jin Kim Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Science TownDaejeon 34141South Korea Department of Mechatronic Engineering Faculty of Mechanical EngineeringHo Chi Minh City University of Technology(HCMUT)Vietnam National UniversityHo Chi Minh CityVietnam Department of Cogno-Mechatronics Engineering College of Nanoscience and NanotechnologyPusan National UniversityBusan 46241South Korea Department of Optics and Mechatronics Engineering College of Nanoscience and NanotechnologyPusan National UniversityBusan 46241South Korea School of Mechanical and Aerospace Engineering Nanyang Technological University(NTU)50 Nanyang AvenueSingapore 639798Singapore Institute of Machinery and Materials Nano-Convergence Mechanical Systems Research DivisionKorea156Gajeongbuk-RoYuseong-GuDaejeon 34103South Korea

Surface plasmon resonance(SPR)sensors are based on photon-excited surface charge density oscillations confined at metal-dielectric interfaces,which makes them highly sensitive to biological or chemical molecular bindings to functional metallic *** nanostructures further concentrate surface plasmons into a smaller area than the diffraction limit,thus strengthening photon-sample ***,plasmonic sensors based on intensity detection provide limited resolution with long acquisition time owing to their high vulnerability to environmental and instrumental ***,we demonstrate fast and precise detection of noble gas dynamics at single molecular resolution via frequency-comb-referenced plasmonic phase *** photon-sample interaction was enhanced by a factor of 3,852 than the physical sample thickness owing to plasmon resonance and thermophoresis-assisted optical confinement *** utilizing a sharp plasmonic phase slope and a high heterodyne information carrier,a small atomic-density modulation was clearly resolved at 5 Hz with a resolution of 0.06 Ar atoms per nano-hole(in 10^(11)RIU)in Allan deviation at 0.2 s;a faster motion up to 200 Hz was clearly *** fast and precise sensing technique can enable the in-depth analysis of fast fluid dynamics with the utmost resolution for a better understanding of biomedical,chemical,and physical events and interactions.

关键词： Frequency comb Nanohole array Single molecule detection Refractive index High resolution High speed Traceability to time standard

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A Study on the Performance Improvement of Axial Flux Permanent Magnet Machines Based on Stator and Rotor Design Modifications

A Study on the Performance Improvement of Axial Flux Permane...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Yun, Jangho Grainger, Brandon Ohodnicki, Paul University of Pittsburgh Department of Mechanical Engineering and Materials Science PittsburghPA United States University of Pittsburgh Department of Electrical and Computer Engineering PittsburghPA United States

ISBN: (纸本)9798350376067

Axial flux permanent magnet (AFPM) machines have technological competitiveness for electric propulsion systems that require compact structures and high-power density. However, challenging design and manufacturing problems that reduce the cost competitiveness cause designers to limit designable variables. In this paper, the effects of slot/pole combination, semi-closed slot, magnetic wedge, and segmented PM on performance in double-sided rotor and double-sided stator geometries designed with stator open slots were investigated through 3-D finite element analysis (FEA). FEA results show that the design variables have a significant impact on torque, torque ripple, and losses. Semi-closed slots or magnetic wedges reduce PM losses for each open slot model by more than 80%, significantly reducing losses compared to segmented PMs, and also reducing torque ripple. As an alternative to stator design modification, results indicate the open slot model can be considered with a slot/pole combination for low cogging torque to reduce torque ripple and segmented PMs to reduce PM losses. © 2024 IEEE.

关键词： Stators

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