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An effect of process parameters during wire cut electrical discharge machining of Inconel 738

Materials Today: Proceedings 2023年 84卷 83-88页

作者： C. Devanathan M.S. Natarajan E. Shankar R. Giri K. Vigneshwaran Department of Mechanical Engineering Rajalakshmi Engineering College Chennai 602 105 India Department of Robotics and Automation Rajalakshmi Engineering College Chennai 602 105 India

In the recent days, super alloys especially nickel based materials are used more than 50% of aerospace gas turbine components such as turbine disc, blades etc., It becomes very hard to shape these materials with the use of traditional machining processes due to its improved strength at higher temperature. To overcome the issues faced during conventional machining, the various advanced machining techniques are tried for machining these super alloys. In the present study, Inconel 738 was cut by wire electrical discharge machining using 0.25 mm diameter copper wire. Demineralized water was used as dielectric fluid between tool and workpiece electrode. During the process, voltage, wire feed rate, time of pulse on and pulse off were adjusted at four different values and totally sixteen slots were cut to analyze the machining characteristics. The machined surfaces were tested for its surface finish, rate of material removal and kerf width. The ANOVA was performed using Minitab software to find out the optimized variables and percentage contribution of each parameter in providing the influencing results. Wire feed rate was the most influencing parameter to have the lowest kerf width. As far as Material removal rate, the four parameters were had the significant impact in increasing the MRR. Voltage is the important process parameter to reduce the surface roughness .

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Manufacturing of PEEK-PDMS Composite Materials for Intervertebral Disc Implants 23

Manufacturing of PEEK-PDMS Composite Materials for Intervert...

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23rd International Conference on Electronics Packaging, ICEP 2024

作者： Mie, Heng-Ching Liu, Yu-Chen Mizuno, Jun National Cheng Kung University Department Of Materials Science And Engineering Taiwan National Cheng Kung University Program On Smart And Sustainable Manufacturing Academy Of Innovative Semiconductor And Sustainable Manufacturing Taiwan National Cheng Kung University Department Of Mechanical Engineering Taiwan

ISBN: (纸本)9784991191176

The current treatment approach for lower back pain caused by intervertebral disc (IVD) degeneration involves the use of PEEK (polyether ether ketone) polymer or titanium alloy based spinal cages to replace the degenerated IVD. However, this method not only restricts the natural mobility of the vertebrae but also fails to mimic the structure and function of the human IVD with a single material. Additionally, the use of high-hardness materials may lead to vertebral settling, further contributing to lower back pain. Therefore, this study is dedicated to utilizing high-biocompatibility polymer (PEEK and Polydimethylsiloxane (PDMS)) composites to create an artificial IVD closely mimics the real intervertebral disc. Through adjusting the manufacture parameters, the proportion of PEEK and PDMS, and the porosity we were able to achieve the elastic modulus that is close to those of humans' IVD. Furthermore, the dual-layer structure can better replicate the functions and structure of human intervertebral disc then spinal cage. © 2024 Japan Institute of Electronics Packaging.

关键词： Polydimethylsiloxane

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Na-22 for Safeguarding and Mass Accounting of Molten Salt Systems

Na-22 for Safeguarding and Mass Accounting of Molten Salt Sy...

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2023 Transactions of the American Nuclear Society Winter Conference and Expo, ANS 2023

作者： Zile, Matthew Van Kauffman, Andrew Herminghuysen, Kevin Li, Shelly Simpson, Michael Kandlakunta, Praneeth Cao, Guoping Cao, Lei R. Nuclear Engineering Program Department of Mechanical and Aerospace Engineering Ohio State University United States Nuclear Reactor Laboratory College of Engineering Ohio State University United States Department of Materials Science and Engineering University of Utah.Idaho National Laboratory United States

The Na-22based radioactive tracer dilution (RTD) technique has been previously demonstrated for mass accounting in small quantities of clean molten salt for bench top testing. While the concept of RTD has proven to be a promising method, it has lacked further validation in large-scale quantities and in fuel-bearing salt. Towards that end, two research initiatives are on-going at The Ohio State University (OSU) and Idaho National Laboratory (INL) to address these challenges. Current work at OSU is focused on evaluating the RTD using the full gamma-ray spectrum of fission products produced by irradiating fuel bearing salt, i.e., UCl3-MgCl2-KCl in a 500-kW research reactor. The INL team has successfully demonstrated the RTD for mass determination using an 8-kg LiCl-KCl-UCl3salt for uranium electrorefining and is currentlyseeking to validate the tracer method with large(about 60 kg)molten salt system(bearing fission products) in an oxide reduction (OR) facility for spent nuclear fuel (SNF) reprocessing. © 2023 American Nuclear Society. All rights reserved.

关键词： Fission products

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Effect of Sn addition on electrochemical activity of ribbons of Mg-Al-Ca anode material for rechargeable magnesium batteries fabricated by rapid solidification

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Keikinzoku/Journal of Japan Institute of Light Metals 2025年第1期75卷 9-13页

作者： Fukuta, Yoshitaka Kikura, Kensei Tsukeda, Tadayoshi Aida, Tetsuo Tabata, Hironobu Kurihara, Hideki Suzuki, Mayumi Program of Materials Science and Engineering Studies in Science and Engineering Graduate School of Science and Engineering University of Toyama 3190 Gofuku Toyama-shi Toyama930-8555 Japan Graduate School of Science and Engineering University of Toyama Toyama-shi Toyama Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama-shi Toyama Japan CHUETSU METAL WORKS CO. LTD. Nakaniikawagun Toyama Japan Saitama Industrial technology Center Kawaguchi-shi Saitama Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Imizu-shi Toyama Japan

Magnesium-based batteries are potential candidates for next-generation rechargeable batteries due to the divalent nature of magnesium cations and the natural abundance of magnesium resources. In this study, the electrochemical activity of Mg-6mass%Al-3mass%Ca anodes combined with Sn was investigated. Thin ribbons of the anode specimens were prepared by a single-roll rapid solidification method. The results showed that the electrochemical activity increased upon adding 1 mass% Sn, while it decreased for 3 mass% Sn. Based on the results of an X-ray diffraction analysis, the addition of Sn led to the formation of Mg2Sn and Ca2Sn phases, which increased the lattice distortion. Scanning electron microscopy observations indicated that these secondary phases were homogeneously distributed for 1 mass% Sn addition, while they were coarsely distributed for 3 mass% Sn. © 2025 The Japan Institute of Light Metals.

关键词： X ray diffraction analysis

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Site Readiness Index for Implementing Industry 4.0 based on the Design Principles and Emerging Manufacturing Technologies

Site Readiness Index for Implementing Industry 4.0 based on ...

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IISE Annual Conference and Expo 2023

作者： Garbie, Ibrahim Parsaei, Hamid Garbie, Muhammad Department of Mechanical Engineering-Industrial Engineering Program College of Engineering Helwan University Cairo Egypt Wm Michael Barnes’64 Department of Industrial and Systems Engineering Texas A&M University College StationTX United States Department of Industrial Systems and Manufacturing Engineering Texas Tech University LubbockTX United States

ISBN: (纸本)9781713877851

Nowadays, Implementing Industry 4.0 (I4.0) has become an urgent mandate in manufacturing enterprises to increase the efficiency and effectiveness of production processes. Six design principles (DP) must be considered to meet the challenges of integrating I4.0 beside the emerging advanced manufacturing technologies (AMT). This paper summarizes the analysis and investigation into the importance of I4.0 side readiness that enables the customization of AMT with the DP. The principal aim of this paper is to support manufacturing enterprises by incorporating AMT with the DP, thus helping these enterprises identify their specific requirements for implementing industry 4.0/ smart manufacturing. A model of estimating side readiness by adopting the DP incorporating customizing AMT is also analyzed and presented. The side readiness index towards implementing I4.0 is assessed and illustrated through a numerical example. © IISE and Expo *** rights reserved.

关键词： Industry 4.0

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Bubble-pen lithography:Fundamentals and applications

Aggregate

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Aggregate 2022年第4期3卷 85-100页

作者： Pavana Siddhartha Kollipara Ritvik Mahendra Jingang Li Yuebing Zheng Walker Department of Mechanical Engineering The University of Texas at AustinAustinTexasUSA Department of Electrical and Computer Engineering The University of Texas at AustinAustinTexasUSA Material Science and Engineering Program Texas Materials InstituteThe University of Texas at AustinAustinTexasUSA

Developing on-chip functional devices requires reliable fabrication methods with high resolution for miniaturization,desired components for enhanced performance,and high throughput for fast prototyping and mass ***,laser-based bubble-pen lithography(BPL)has been developed to enable sub-micron linewidths,in situ synthesis of custom materials,and on-demand patterning for various functional components and *** exploits Marangoni convection induced by a laser-controlled microbubble to attract,accumulate,and immobilize particles,ions,and molecules onto different *** years have witnessed tremendous progress in theory,engineering,and application of BPL,which motivated us to write this ***,an overview of experimental demonstrations and theoretical understandings of BPL is ***,we discuss the advantages of BPL and its diverse applications in quantum dot displays,biological and chemical sensing,clinical diagnosis,nanoalloy synthesis,and *** conclude this review with our perspective on the challenges and future directions of BPL.

关键词： additive manufacturing capillary flow lithography marangoni convection microbubbles sensing

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21-Component compositionally complex ceramics: Discovery of ultrahigh-entropy weberite and fergusonite phases and a pyrochlore–weberite transition

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Journal of Advanced Ceramics 2022年第4期11卷 641-655页

作者： Mingde QIN Heidy VEGA Dawei ZHANG Sarath ADAPA Andrew J.WRIGHT Renkun CHEN Jian LUO Department of Nano Engineering University of California San DiegoLa Jolla 92093USA Department of Chemistry and Biochemistry University of California San DiegoLa Jolla 92093USA Program of Materials Science and Engineering University of California San DiegoLa Jolla 92093USA Department of Mechanical and Aerospace Engineering University of California San DiegoLa Jolla 92093USA

Two new high-entropy ceramics(HECs)in the weberite and fergusonite structures,along with the unexpected formation of ordered pyrochlore phases with ultrahigh-entropy compositions and an abrupt pyrochlore–weberite transition,are discovered in a 21-component oxide *** the Gibbs phase rule allows 21 equilibrium phases,9 out of the 13 compositions examined possess single HEC phases(with ultrahigh ideal configurational entropies:~2.7kB per cation or higher on one sublattice in most cases).Notably,(15RE_(1/15))(Nb_(1/2)Ta_(1/2))O_(4) possess a single monoclinic fergusonite(C2/c)phase,and(15RE_(1/15))_(3)(Nb_(1/2)Ta_(1/2))_(1)O_(7) form a single orthorhombic(C222_(1))weberite phase,where 15RE_(1/15) represents Sc_(1/15)Y_(1/15)La_(1/15)Pr_(1/15)Nd_(1/15)Sm_(1/15)Eu_(1/15)Gd_(1/15)Tb_(1/15)Dy_(1/15)Ho_(1/15)Er_(1/15)Tm_(1/15) Yb_(1/15)Lu_(1/15).Moreover,a series of eight(15RE_(1/15))_(2+x)(Ti_(1/4)Zr_(1/4)Ce_(1/4)Hf_(1/4))_(2−2x)(Nb_(1/2)Ta_(1/2))_(x)O_(7) specimens all exhibit single phases,where a pyrochlore–weberite transition occurs within 0.75

关键词： compositionally complex ceramics high-entropy ceramics(HECs) weberite pyrochlore fergusonite ultrahigh-entropy ceramics many-component ceramics

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SWhegPro3: A Three-Impeller Wheel-Leg Transformable Robot with Variable Robust Adaptability to Stair Dimensions

SWhegPro3: A Three-Impeller Wheel-Leg Transformable Robot wi...

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2023 IEEE International Conference on robotics and Biomimetics, ROBIO 2023

作者： Wang, Haoran Wang, Siyuan Dai, Cunxi Jia, Zhenzhong Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems Department of Mechanical and Energy Engineering Shenzhen518055 China Guangdong Prov. Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities SUSTech Shenzhen518055 China

ISBN: (纸本)9798350325706

This paper reports the design innovation and implementation of a novel wheel-leg transformable robot named SWhegPro3. The robot uses a three-impeller design to significantly improve the overall stair-climbing performance. Unlike other impeller-based designs that use gear sets to unfold the impellers, this robot uses self-locking electric push rods for mode switching, thereby greatly improving its load capacity. We also analyze the stair climbing operation and derive a model to calculate the optimal configuration of the wheel-leg module and the corresponding displacement of the push rod, in order to better adapt to different sized stairs. We conduct both simulation and field experiments to validate our proposed design and control strategy. © 2023 IEEE.

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Fine and ultrafine particle- and gas-polycyclic aromatic hydrocarbons affecting southern Thailand air quality during transboundary haze and potential health effects

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Journal of Environmental Sciences 2023年第2期124卷 253-267页

作者： Napawan Mahasakpan Phatsarakorn Chaisongkaew Muanfun Inerb Nobchonnee Nim Worradorn Phairuang Surajit Tekasakul Masami Furuuchi Mitsuhiko Hata Thaniya Kaosol Perapong Tekasakul Racha Dejchanchaiwong Air Pollution and Health Effect Research Center Prince of Songkla UniversityHat YaiSongkhla 90110Thailand Energy Technology Program Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90110Thailand Faculty of Environmental Management Prince of Songkla UniversityHat YaiSongkhla 90110Thailand Department of Geography Faculty of Social SciencesChiang Mai UniversityMuangChiang Mai 50200Thailand Department of Chemistry Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla 90110Thailand Faculty of Geoscience and Civil Engineering Institute of Science and EngineeringKanazawa UniversityKakuma-machiKanazawaIshikawa 920-1192Japan Department of Civil and Environmental Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90110Thailand Department of Mechanical and Mechatronics Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90110Thailand Department of Chemical Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90110Thailand

Distribution of PM_(0.1),PM_(1) and PM_(2.5) particle-and gas-polycyclic aromatic hydrocarbons(PAHs)during the 2019 normal,partial and strong haze periods at a background location in southern Thailand were investigated to understand the behaviors and carcinogenic ***1 was the predominant component,during partial and strong haze periods,accounting for 45.1% and 52.9% of total suspended particulate matter,respectively,while during normal period the contribution was only 34.0%.PM_(0.1) concentrations,during the strong haze period,were approximately 2 times higher than those during the normal *** increased levels of particle-PAHs for PM_(0.1),PM_(1) and PM_(2.5) were observed during strong haze period,about 3,5 and 6 times higher than those during normal ***-PAH concentrations were 10 to 36 times higher than those of particle-PAHs for PM_(2.5).Average total Benzo[a]Pyrene Toxic Equivalency Quotients(BaP-TEQ)in PM_(0.1),PM_(1) and PM_(2.5) during haze periodswere about 2–6 times higher than in the normal *** total accumulated Incremental Lifetime Cancer Risks(ILCRs)in PM_(0.1),PM_(1) and PM_(2.5) for all the age-specific groups during the haze effected scenario were approximately 1.5 times higher than those in nonhaze scenario,indicating a higher potential carcinogenic *** observations suggest PM_(0.1),PM_(1) and PM_(2.5) were the significant sources of carcinogenic aerosols and were significantly affected by transboundary haze from peatland *** leads to an increase in the volume of smoke aerosol,exerting a significant impact on air quality in southern Thailand,as well as many other countries in lower southeast Asia.

关键词： Particle-PAH Gas-PAH Ultrafine particle Health risk Source identification

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SiO2-reinforced Poly (methyl methacrylate): Tribology Performance as Service Life Sensor

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Sensors and Materials 2023年第8-2期35卷 2845-2854页

作者： Shi, Shih-Chen Zeng, Xin-Xing Chen, Tao-Hsing Wang, Chih-Chia Lin, Yue-Feng Department of Mechanical Engineering National Cheng Kung University No. 1 University Road Tainan City70101 Taiwan Department of Mechanical Engineering National Kaohsiung University of Science and Technology No. 415 Jiangong Rd. Sanmin Dist. Kaohsiung City807618 Taiwan Department of Chemical and Materials Engineering Chung Cheng Institute of Technology National Defense University No. 75 Shiyuan Road Taoyuan335009 Taiwan System Engineering and Technology Program National Yang Ming Chiao Tung University No. 1001 University Road Hsinchu300093 Taiwan Department of Mechanical Engineering National Chin-Yi University of Technology No. 57 Sec. 2 Zhongshan Rd. Taiping Dist. Taichung411030 Taiwan

Poly (methyl methacrylate) (PMMA), which is suitable for use in the human body owing to its biocompatibility, is commonly used in medical applications such as bone nails, bone cement, and dentures. However, owing to its hard and brittle nature, PMMA can cause damage when it is subjected to excessive stress and can also cause severe wear. In this study, three different sizes of silica particles were used as reinforcing additives to enhance the wear resistance of PMMA composites. A pin-on-disk wear test was conducted to record the coefficient of friction and wear volume, and the wear volume was measured using a 3D laser scanning microscope. In the wear test, the transfer film of micron and submicron particles produced a plowing effect, resulting in wide grooved wear scars and a higher wear rate than the raw material. The nanoparticle transfer film reduced direct material wear, the wear scars were fine and flat, and the wear rate was decreased, reducing the wear of SiO2-reinforced PMMA composites by 40%. The experimental results revealed that the wear volume is proportional to the wear time. In addition, the observed area of the transfer film on the wear counterpart can be used as a service life sensor of the coating material. © MYU K.K.

关键词： Tribology

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