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2023 IEEE Electric Ship Technologies Symposium, ESTS 2023

作者： Marzec, Todd J. Raju, Ravisekhar Grainger, Brandon Ohodnicki, Paul R. University of Pittsburgh Department of Electrical and Computer Engineering Pittsburgh United States Fastwatt Llc Clifton Park United States University of Pittsburgh Department of Mechanical Engineering and Materials Science Pittsburgh United States

ISBN: (纸本)9781665465151

Inductors are energy storage devices that serve as key components in power conversion technology. The advent of wide-bandgap (WBG) semiconductor devices has led to high frequency operation of power converters at higher voltage and current levels. In the range of 20kHz-1MHz, additional sources of loss in magnetic components interfacing to these WBG semiconductors are introduced due to high-frequency electromagnetic phenomena. Finite element analysis can capture these effects to a high degree of accuracy but require extensive computation time precluding their application in robust optimization and design schemes. There exist several analytical models for winding loss in literature that can evaluate multiple designs with minimal computation cost. In this work, popular models are reviewed, investigated, and expanded on in the context of various toroidal winding geometries. The goal of this work is to analyze well-known winding loss models and demonstrate their accuracies at high frequency (beyond 20kHz) as they pertain to toroidal inductors while maintaining the low computation cost required for integration into optimization and design schemes. © 2023 IEEE.

关键词： Analytical models

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Microstructural evolution and superior properties of conductive Al–Fe alloy processed by ECAP

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International Journal of Lightweight materials and Manufacture 2023年第4期6卷 552-562页

作者： Shuai, Guoliang Zhang, Meng Li, Zhen Valiev, Ruslan Z. Medvedev, Andrey E. Zhang, Diantao Elhefnawey, Maged Chen, Feng Li, Li International Joint Laboratory of Advanced Bulk Nanomaterials for Innovative Applications Harbin Engineering University Harbin China Harbin China Institute of Physics of Advanced Materials Ufa University of Science and Technology Ufa Russia Laboratory of Metals and Alloys Under Extreme Impacts Ufa University of Science and Technology Ufa Russia Department of Mechanical Engineering Faculty of Engineering Kafrelsheikh University Kafrelsheikh Egypt

The new conductive Al–Fe alloy (AA8176) is used in power transmission due to its high electrical conductivity. As a non-agе-hardenable alloy, Al–Fe alloy is not a subject for the strength improvement. So, Equal-channel Angular Pressing (ECAP) is introduced to try to develop the advanced Al–Fe alloy with improved mechanical performance and good electrical conductivity. After different number of passes at room temperature, its electrical conductivity is maintained at quite high value (>60% IACS), close to that of pure aluminum, and its change during ECAP processing is insignificant. At the same time, the yield strength increases sharply from 46 MPa to a nearly 200 MPa after 8 passes. Elongation to failure also increases to 11% with increasing the number of passes. Superior combination of strength and electrical conductivity was demonstrated in alloys subjected to ECAP. Also, the study of microstructural evolution with a close attention to the evaluation of grain size, misorientation angle, size and distribution of Al–Fe intermetallic particles was performed. ECAP shows different advantages and potential in Al–Fe alloy performance improvement by achieving the ultra-fined grains and high-density dislocations through the imposed strain, instead of the formation of abundant precipitates in alloys through traditional heat treatment. © 2023 The Authors

关键词： Equal channel angular pressing

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Electrospun Flexible Nanofibres for Batteries:Design and Application

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Electrochemical Energy Reviews 2023年第1期6卷 464-531页

作者： P.Robert Ilango A.Dennyson Savariraj Hongjiao Huang Linlin Li Guangzhi Hu Huaisheng Wang Xiaodong Hou Byung Chul Kim Seeram Ramakrishna Shengjie Peng Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental ScienceYunnan UniversityKunming 650504YunnanChina College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016JiangsuChina Institute for Energy Studies University of North DakotaGrand ForksND 58202USA Department of Advanced Components and Materials Engineering Sunchon National University255 Jungang-roSuncheon-siJeollanam-do 57922Republic of Korea Department of Mechanical Engineering Khalifa University127788 Abu DhabiUnited Arab Emirates Department of Physics PSGR Krishnammal College for WomenCoimbatoreTamil Nadu 641004India School of Chemistry and Chemical Engineering Liaocheng UniversityLiaocheng 252000LiaoningChina Mechanical Engineering National University of SingaporeSingapore 117583Singapore

Flexible and free-standing electrospun nanofibres have been used as electrode materials in electrochemical energy storage systems due to their versatile properties,such as mechanical stability,superb electrical conductivity,and high *** energy storage systems such as metal-ion,metal-air,and metal-sulphur batteries,electrospun nanofibres are vital for constructing flexible electrodes and substantially enhancing their electrochemical *** need for flexible batteries has increased with increasing demand for new products such as wearable and flexible devices,including smartwatches and flexible *** batteries have several semirigid to rigid components that limit their expansion in the flexible device *** creation of flexible and wearable batteries with greater mechanical flexibility,higher energy,and substantial power density is critical in meeting the demand for these new electronic *** implementation of carbon and carbon-derived composites into flexible electrodes is required to realize this *** is essential to understand recent advances and the comprehensive foundation behind the synthesis and assembly of various flexible electrospun *** design of nanofibres,including those comprising carbon,N-doped carbon,hierarchical,porous carbon,and metal/metal oxide carbon composites,will be *** will highlight the merits of electrospun carbon flexible electrodes by describing porosity,surface area,binder-free and free-standing electrode construction,cycling stability,and performance *** scientific progress has been achieved and logistical challenges have been met in promoting secondary battery usage;therefore,this review of flexible electrode materials will advance this easily used and sought-after *** challenges and prospects involved in the timely development of carbon nanofibre composite flexible electrodes and batteries will be addressed.

关键词： Electrospinning Carbon composite Flexibility Electrode Batteries

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Ultrafast, High-Intensity Laser Material Interaction in Polycrystalline Alumina Transparent Ceramics

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SSRN 2025年

作者： Chong, Poh Yin Wu, Xingzhong Castillo, Gabriel R. Garay, Javier E. Laboratory Mechanical and Aerospace Engineering Department Materials Science and Engineering Program University of California La Jolla San DiegoCA92093 United States

High-intensity pulsed laser-material interaction is a complicated process involving various laser parameters and material properties, and the coupling of these factors affects material modifications. This study investigates the laser-material interactions of single-crystal alumina (SCA) and transparent polycrystalline alumina (PCA). To understand the underlying mechanism of laser-induced modifications, single-shot irradiations are conducted using an ultrafast laser (λ = 1030 nm, τρ = 490 fs). This experiment focuses on the high-intensity regime from 1012 W/cm2 to 1015 W/cm2, generating high temperatures and pressure causing modifications (melting, ablation, and fracture). While SCA and PCA are fundamentally Al2O3, the difference in microstructure alters the optical and mechanical properties. The ablation depth shows a sublinear power law relationship with laser intensity for both materials although the energy dependence is lower for PCA. The differences can be attributed to different damage mechanisms;the laser-induced craters in SCA exhibit predominantly melting whereas PCA demonstrates fracture-like morphologies. The fracture in PCA is surprising given its higher indent-produced fracture resistance. The differences in fracture behavior can be reconciled considering the much higher pressure application rates produced by laser pulsing. PCA has a lower laser-induced damage threshold (LIDT) than SCA. Laser-induced crater area and volume increase linearly with laser fluence and peak intensity. Altering the focusing conditions can change the LIDT and expand the laser processing window. © 2025, The Authors. All rights reserved.

关键词： Single crystals

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JARVIS-Leaderboard:a large scale benchmark of materials design methods

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npj Computational materials 2024年第1期10卷 2280-2296页

作者： Kamal Choudhary Daniel Wines Kangming Li Kevin F.Garrity Vishu Gupta Aldo H.Romero Jaron T.Krogel Kayahan Saritas Addis Fuhr Panchapakesan Ganesh Paul R.C.Kent Keqiang Yan Yuchao Lin Shuiwang Ji Ben Blaiszik Patrick Reiser Pascal Friederich Ankit Agrawal Pratyush Tiwary Eric Beyerle Peter Minch Trevor David Rhone Ichiro Takeuchi Robert B.Wexler Arun Mannodi-Kanakkithodi Elif Ertekin Avanish Mishra Nithin Mathew Mitchell Wood Andrew Dale Rohskopf Jason Hattrick-Simpers Shih-Han Wang Luke E.K.Achenie Hongliang Xin Maureen Williams Adam J.Biacchi Francesca Tavazza Material Measurement Laboratory National Institute of Standards and TechnologyGaithersburgMD20899USA Department of Materials Science and Engineering University of Toronto27 King’s College CirTorontoONCanada Department of Electrical and Computer Engineering Northwestern UniversityEvanstonIL 60208USA Lewis-Sigler Institute for Integrative Genomics Princeton UniversityPrincetonNJ 08544USA Ludwig Institute for Cancer Research Princeton UniversityPrincetonNJ 08544USA Department of Physics and Astronomy West Virginia UniversityMorgantownWV 26506USA Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTN 37831USA Center for Nanophase Materials Science Oak Ridge National LaboratoryOak RidgeTN 37831USA Computational Sciences and Engineering Division Oak Ridge National LaboratoryOak RidgeTN 37831USA Department of Computer Science and Engineering Texas A&M UniversityCollege StationTX 77843USA Globus University of ChicagoChicagoIL 60637USA Data Science and Learning Division Argonne National LabLemontIL 60439USA Institute of Nanotechnology Karlsruhe Institute of TechnologyKaiserstraße 1276131 KarlsruheGermany Institute of Theoretical Informatics Karlsruhe Institute of TechnologyKaiserstraße 1276131 KarlsruheGermany Department of Chemistry and Biochemistry and Institute for Physical Science and Technology University of MarylandCollege ParkMD 20742USA Department of Physics Applied Physics and AstronomyRensselaer Polytechnic InstituteTroyNY12180USA Department of Materials Science and Engineering University of MarylandCollege ParkMD20742USA Department of Chemistry and Institute of Materials Science and Engineering Washington University in St.LouisSt.LouisMO63130USA School of Materials Engineering Purdue UniversityWest LafayetteIN47907USA Department of Mechanical Science and Engineering University of Illinois Urbana-ChampaignUrbanaIllinois 61801USA Materials Research Laboratory University of Illinois Urbana-ChampaignUrbanaIL 61801USA Theore

Lack of rigorous reproducibility and validation are significant hurdles for scientific development across many *** science,in particular,encompasses a variety of experimental and theoretical approaches that require careful *** efforts have been developed previously to mitigate these ***,a comprehensive comparison and benchmarking on an integrated platform with multiple data modalities with perfect and defect materials data is still *** work introduces JARVIS-Leaderboard,an open-source and community-driven platform that facilitates benchmarking and enhances *** platform allows users to set up benchmarks with customtasks and enables contributions in the form of dataset,code,and meta-data *** cover the following materials design categories:Artificial Intelligence(AI),Electronic Structure(ES).

关键词： rigorous perfect enable

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OPTIMAL LAY-UPS TO MINIMIZE PROCESS-INDUCED DEFORMATIONS IN L-SHAPED CFRP PARTS VIA LAYER-WISE MODELS

OPTIMAL LAY-UPS TO MINIMIZE PROCESS-INDUCED DEFORMATIONS IN ...

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SAMPE 2023 Conference and Exhibition

作者： Zappino, Enrico Schoenholz, Caleb Masia, Rebecca Zobeiry, Navid Petrolo, Marco MUL2 Lab Department of Mechanical and Aerospace Engineering Politecnico di Torino Turin10129 Italy Department of Materials Science and Engineering University of Washington SeattleWA98195 United States

ISBN: (纸本)9781934551431

This paper presents results concerning the mitigation of process-induced deformations in composite parts. The focus is on combining numerical models based on finite elements and experimental testing to propose specific lay-ups around geometry transition points, such as sharp corners, to minimize process-induced deformations such as spring-in angle and warpage. The numerical model is based on higher-order layer-wise 1D finite elements providing very accurate through-the-thickness distributions of shear and peeling stresses. Such a numerical approach requires a fraction of the computational cost usually needed by 3D finite element models. Evolution of material properties such as degree of cure, viscoelastic moduli, and free strains are characterized using DSC and DMA tests. Accordingly, a cure-hardening instantaneously linear elastic (CHILE) constitutive model is adopted for numerical simulations. Simulation results and proposed optimal lay-ups are validated by fabricating L-shape parts with similar conditions. © 2023 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Numerical models

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Effect of Ta on the Evolution of Phases and mechanical Properties of Novel Seven Components Fe–Co–Ni–Cr–V–Al–Ta Eutectic High Entropy Alloys: Experimental Study and Numerical Simulation

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Transactions of the Indian National Academy of engineering 2024年第3期9卷 657-671页

作者： Jain, Sandeep Jain, Reliance Kumar, Vinod Samal, Sumanta Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Indore Indore India Department of Mechanical Engineering Mandsaur University Mandsaur India

Eutectic high entropy alloys (EHEAs) with seven components (Fe, Co, Ni, Cr, V, Al, and Ta) were designed and developed via vacuum arc melting route guided by the predictions obtained from ThermoCalc simulations and ANSYS Fluent. The phase evolution was predicted using CALPHAD approach which shows that when 10 at. % Ta is added, the microstructure is changed from hypoeutectic to hypereutectic with the presence of FCC and Laves phases. The simulation results explained that the time period for solidification was increased from 0.16 to 0.19 s with the addition of Ta. The solid–liquid interface advancement and the cooling curve slope at two-phase existence were linear and having different slopes by changing the Ta content. The experimental results also show the presence of eutectic mixture (L → FCC + Laves) of ductile FCC phase and hard Laves phase. The mechanical properties such as tensile strength, yield strength and microhardness of the studied alloys are increased from 828 MPa, 494 MPa, 204.67 HV to 1257 MPa, 1140.5 MPa, and 651.4 HV with the reduction of % elongation from 47.6 to 28.5% with the addition of Ta from 2.5 to 10%. The experimental results corroborate with the predicted results using thermodynamic simulation and numerical simulation by ANSYS Fluent software.

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3D Printed Biomimetic Metamaterials with Graded Porosity and Tapering Topology for Improved Cell Seeding and Bone Regeneration

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Bioactive materials 2023年第7期25卷 677-688页

作者： Lei Zhang Bingjin Wang Bo Song Yonggang Yao Seung-Kyum Choi Cao Yang Yusheng Shi State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Department of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA30332USA

Biomimetic metallic biomaterials prepared for bone scaffolds have drawn more and more attention in recent ***,the topological design of scaffolds is critical to cater to multi-physical requirements for efficient cell seeding and bone regeneration,yet remains a big scientific challenge owing to the coupling of mechanical and mass-transport properties in conventional scaffolds that lead to poor control towards favorable modulus and permeability ***,inspired by the microstructure of natural sea urchin spines,biomimetic scaffolds constructed by pentamode metamaterials(PMs)with hierarchical structural tunability were additively manufactured via selective laser *** mechanical and mass-transport properties of scaffolds could be simultaneously tuned by the graded porosity(B/T ratio)and the tapering level(D/d ratio).Compared with traditional metallic biomaterials,our biomimetic PM scaffolds possess graded pore distribution,suitable strength,and significant improvements to cell seeding efficiency,permeability,and impact-tolerant capacity,and they also promote in vivo osteogenesis,indicating promising application for cell proliferation and bone regeneration using a structural innovation.

关键词： Biomimetic biomaterials Pentamode metamaterials Selective laser melting Mass-transport properties Bone scaffolds

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On-skin and tele-haptic application of mechanically decoupled taxel array on dynamically moving and soft surfaces

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npj Flexible Electronics 2022年第1期6卷 964-972页

作者： Se Young Kwon Gyeongsuk Park Hanbit Jin Changyeon Gu Seung Jin Oh Joo Yong Sim Wooseup Youm Taek-Soo Kim Hye Jin Kim Steve Park Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Electronics and Telecommunications Research Institute(ETRI) Daejeon 34129Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Mechanical Systems Engineering Sookmyung Women’s UniversityDaejeon 04313Republic of Korea

To accurately probe the tactile information on soft skin,it is critical for the pressure sensing array to be free of noise and inter-taxel crosstalk,irrespective of the measurement ***,on dynamically moving and soft surfaces,which are common conditions for on-skin and robotic applications,obtaining precise measurement without compromising the sensing performance is a significant challenge due to mechanical coupling between the sensors and with the moving *** this work,multi-level architectural design of micro-pyramids and trapezoid-shaped mechanical barrier array was implemented to enable accurate spatiotemporal tactile sensing on soft surfaces under dynamic ***-off relationship between limit of detection and bending insensitivity was discovered,which was overcome by employing micropores in barrier ***,in-situ pressure mapping on dynamically moving soft surfaces without signal distortion is demonstrated while human skin and/or soft robots are performing complicated tasks such as reading Braille and handling the artificial organs.

关键词： artificial moving dynamically

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programmable Modular Acoustic Microrobots 6

Programmable Modular Acoustic Microrobots

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6th International Conference on Manipulation, Automation, and Robotics at Small Scales, MARSS 2023

作者： Cherukumilli, Subrahmanyam Kirmizitas, Fatma Ceren Sokolich, Max Valencia, Alejandra Karakan, M. Cagatay White, Alice E. Malikopoulos, Andreas A. Das, Sambeeta University of Delaware Department of Mechanical Engineering NewarkDE19716 United States University of Delaware Department of Animal and Food Sciences NewarkDE19716 United States Boston University Department of Biomedical Engineering BostonMA02215 United States Boston University Department of Mechanical Engineering Departments of Biomedical Engineering and Materials Science and Engineering BostonMA02215 United States

ISBN: (纸本)9798350330397

Microrobots have emerged as promising tools for biomedical and in vivo applications, leveraging their untethered actuation capabilities and miniature size. Despite extensive research on diversifying multi-actuation modes for single types of robots, these tiny machines tend to have limited versatility while navigating different environments or performing specific tasks. To overcome such limitations, self-assembled microstructures with on-demand reconfiguration capabilities have gained recent attention as the future of biocompatible microrobotics, since they can address drug delivery, microsurgery, and organoid development processes. Reversible modular reconfiguration structures require specific arrangements of particles that can assume several shapes when external fields are applied. We show how magnetic interaction can be used to assemble cylindrical microrobots into modular microstructures with different shapes. The motion of the formed microstructure is actuated via an external acoustic field, which generates responsive forces in the air bubbles trapped in the inner cavity of the robots. An external magnetic field can also steer these structures. We illustrate these capabilities by assembling the robots into different shapes that can swim and be steered, showing the potential to perform biomedical applications. Furthermore, we confirm the biocompatibility of the cylindrical microrobots used as the building blocks of our microstructure. Exposing Chinese Hamster Ovary cells to our microrobots for 24 hours demonstrates cell viability when in contact with the microrobot. © 2023 IEEE.

关键词： Microstructure

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