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SSRN 2023年

作者： Chen, Yunhao Zhao, Xiaohui Yang, Bin Liang, Yongchang Li, Ziwei Liu, Yu Chen, Chao Key Laboratory of Automobile Materials School of Materials Science and Engineering Jilin University Changchun130025 China School of Mechanical and Aerospace Engineering Jilin University Changchun130025 China

In view of the limitation that the wire arc additive technology can not be formed at one time, the welding technology has become the key to solve this problem effectively. In this work, 304 stainless steel thin-wall component obtained by CMT additive manufacturing is selected as the base metal to study the weldability of thin-wall component. The results show that the welded joints with good performance are obtained after TIG welding along the traveling direction and the building direction. In the traveling direction, tensile strength, yield strength and elongation became 666.6Mpa , 356.0Mpa and 37.7 %, only reduced by 8.1%, 13.1% and 6% respectively compare the base metal. In the traveling direction,the tensile strength, yield strength and elongation became 540.1Mpa, 320.4MPa, and 40.2% decrease 17.6%, 16.0% and 26.8% respectively after *** grain orientation changed from [001] before welding to [111] after welding in both traveling direction and the building direction. © 2023, The Authors. All rights reserved.

关键词： Tensile strength

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Hydrogen Trapping and Embrittlement in Metals – A Review

arXiv

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arXiv 2024年

作者： Chen, Yi-Sheng Huang, Chao Liu, Pang-Yu Yen, Hung-Wei Niu, Ranming Burr, Patrick Moore, Katie L. Martínez-Pañeda, Emilio Atrens, Andrej Cairney, Julie M. Australian Centre for Microscopy and Microanalysis University of Sydney Australia School of Aerospace Mechanical and Mechatronic Engineering University of Sydney Australia Department of Materials Science and Engineering National Taiwan University Taiwan Advanced Research Center For Green Materials Science and Technology National Taiwan University Taiwan School Mechanical and Manufacturing Engineering University of New South Wales Australia Department of Materials University of Manchester United Kingdom Photon Science Institute University of Manchester United Kingdom Department of Civil and Environmental Engineering Imperial College London United Kingdom School of Mechanical and Mining Engineering University of Queensland St Lucia4072 Australia

Hydrogen embrittlement in metals (HE) is a serious challenge for the use of high strength materials in engineering practice and a major barrier to the use of hydrogen for global decarbonization. Here we describe the factors and variables that determine HE susceptibility and provide an overview of the latest understanding of HE mechanisms. We discuss hydrogen uptake and how it can be managed. We summarize hydrogen trapping and the techniques used for its characterization. We also review literature that argues that hydrogen trapping can be used to decrease HE susceptibility. We discuss the future research that is required to advance the understanding of HE and hydrogen trapping and to develop HE-resistant alloys. Copyright © 2024, The Authors. All rights reserved.

关键词： Hydrogen

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Fabrication and characterisation of La0.8Sr0.2CrO3-ITO thermocouples for high-temperature sensing

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International Journal of Nanomanufacturing 2022年第1期18卷 1-8页

作者： Chen, Bohan Huang, Manguo Zhang, Meiju Liang, Xiaobo Liu, Dan Wang, Lingyan Niu, Gang Zhang, Zhongkai Tian, Bian Shi, Peng Ren, Wei Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education and International Center for Dielectric Research School of Electronic and Information Engineering Xi’an Jiaotong University Xi’an710049 China Beijing Changcheng Aeronautic Measurement and Control Technology Research Institute Beijing101111 China Aviation Key Laboratory of Science and Technology on Special Condition Monitoring Sensor Technology Beijing101111 China State Key Laboratory for Mechanical Manufacturing Systems Engineering School of Mechanical Engineering Xi’an Jiaotong University Xi’an710049 China

La0.8Sr0.2CrO3-ITO thermocouples were successfully fabricated by screen printing. The La0.8Sr0.2CrO3 powder used for screen printing was obtained by the sol-gel method. The highest thermal voltage output was maintained at 270 mV at 1270°C. The microstructure of La0.8Sr0.2CrO3 and ITO electrode films were analysed by SEM. Thermoelectric response test was implemented to measure the performance of La0.8Sr0.2CrO3-ITO thermocouple by three times of thermal cycles. The results indicated that La0.8Sr0.2CrO3-ITO thermocouple showed good stability at high temperature. Copyright © 2022 Inderscience Enterprises Ltd.

关键词： Screen printing

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Ultrasonic Impact Treatment of Ti-Based Amorphous Alloy: Improved Tribological Performance in Air and 3.5% NaCl Solution

SSRN

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SSRN 2023年

作者： Ji, Xiulin Jin, Juan Lai, Youbin Wang, Fengtao Huang, Xingmin Department of Mechanical Engineering Shantou University 515063 China College of Mechanical & Electrical Engineering Hohai University Changzhou213022 China School of Materials Science & Engineering Southwest Jiaotong University Chengdu610031 China

The inherent brittleness of amorphous alloys limits their tribological properties. Ultrasonic impact treatment (UIT), applied without preloading, has been used to improve the tribological performance of Ti-based amorphous alloys. Following UIT, the impacted surface softened, whereas the vertical surface hardened. The change in hardness could be controlled by varying the UIT duration and ultrasonic power. UIT leads to an increase in relaxation enthalpy, suggesting higher free volume and enhanced plasticity. This improved plasticity is evidenced by the Vickers indentation morphologies and the pop-in phenomena of the nanoindentation curves. Regardless of whether the tribology testing was performed in air or in a 3.5% NaCl solution, UIT led to noticeable reductions in both the coefficient of friction (COF) and the wear rate. The corrosion resistance improved noticeably in both static and sliding states. The primary wear mechanisms were adhesion, abrasion, and delamination. Compared to sliding in air, the COF and wear rate were lower in the NaCl solution. Post UIT, the higher free volume facilitates oxidation in air and the formation of protective corrosion products in the NaCl solution, which is beneficial in reducing adhesion. Simultaneously, the improved plasticity resulting from UIT aids in resistance to fatigue and delamination. Therefore, UIT is a simple and feasible method for significantly improving the tribological performance of amorphous alloys. © 2023, The Authors. All rights reserved.

关键词： Tribology

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Experimental Evaluation of Internet of Things Assisted Human Voice based Smart Home Controlling System

Experimental Evaluation of Internet of Things Assisted Human...

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2023 International Conference on Innovative Computing, Intelligent Communication and Smart Electrical Systems, ICSES 2023

作者： Pavaiyarkarasi, R. Rajendran, N. Vijayashanthi, R.S. Saranya, G. Mohanavel, V. R.M.K. Engineering College Department of ECE Chennai India B.S. Abdur Rahman Crescent Institute of Science and Technology Department of Information Technology Chennai Vandalur India S.A. Engineering College Department of ECE Chennai India Sri Krishna College of Engineering and Technology Department of Electronics and Communication Engineering Coimbatore Kuniyamuthur India Bharath Institute of Higher Education and Research Centre for Materials Engineering and Regenerative Medicine Chennai India Chandigarh University Department of Mechanical Engineering Punjab Mohali140413 India

ISBN: (纸本)9798350319200

When considering the application of the Internet of Things (IoT) within the realm of household environments, it has the transformative potential to elevate an ordinary dwelling into a smart, safer, and automated home. This paper introduces a Voice controlled Home Application, which offers users remote access to their household appliances. This innovative system harnesses the power of IoT technology and voice recognition, providing users with an intuitive and highly efficient means of controlling a diverse array of home appliances and devices. Through voice commands or text messages, users can seamlessly engage with their smart home ecosystem, eliminating the need for manual adjustments. This amazing technology puts the power in our hands, allowing us to effortlessly give voice commands or send text messages. With this system, we can easily turn our appliances on or off to suit our needs, and the best part is, we can do it from anywhere, even if we were not physically at home. All we need to take advantage of this system is our trusty Android smartphone, a device that has become a part of our daily lives, and a control circuit. This control circuit revolves around an Arduino Uno microcontroller, which takes care of processing our commands and handling the operations of our devices. The microcontroller and our smartphone communicate via Bluetooth, a widely embraced wireless technology renowned for its excellent data-sharing capabilities. © 2023 IEEE.

关键词： Internet of Things IoT Smart Home Controlling System Voice controlled Home Application

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Versatile Robotic Welding System Integrating Laser Positioning, Trajectory Fitting and Real-Time Tracking

SSRN

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SSRN 2023年

作者： Zhao, Xiaohui Wang, Hao Chi, Yupeng Liu, Yu Liang, Yongchang Yang, Bin Key Laboratory of Automobile Materials School of Materials Science and Engineering Jilin University Changchun130025 China School of Mechanical and Aerospace Engineering Jilin University Changchun130025 China

The three welding modes of laser positioning, trajectory fitting and real-time tracking are key links for flexible robotic welding, because they directly affect the adaptability of welding robots for complex structural parts. Nevertheless, there are few studies on the integration of laser positioning, trajectory fitting and real-time tracking welding. Aiming at the drawback of that the robot cannot efficiently match the corresponding welding process between different working conditions such as short seam, spatial curve seam and long seam welding, a control scheme that can integrate the above three welding modes is proposed in this paper. First, the welding requirements of laser positioning, trajectory fitting and real-time tracking are transformed into a unified 3D coordinate recognition task for integrated welding, so the identification of welding points under three different processes can be obtained through an identical inference. The next, given the fast inference speed of YOLOv5, a joint ROI extraction algorithm with YOLOv5 as the core is applied. To compensate for YOLOv5's inability to directly locate seam centers, iterative centerline unbiased detector (ICUD) and adaptive feature extraction algorithm (AFEA) are proposed without the need for complex image pre-processing and with very strong immunity to strong exposure and strong arc splash. Finally, teaching trajectory correction model, B-spline curve fitting model, and 3D coordinate real-time tracking model are presented to enhance the adaptability of the welding robot and to flexibly match the appropriate welding mode in various working conditions. Experimental results indicate that the welding trajectory is basically consistent with the seam centerline when laser positioning and trajectory fitting welding. In real-time tracking welding, the real-time deviation is mainly controlled within the range of ±0.2 mm, and the average error is 0.1160 mm. © 2023, The Authors. All rights reserved.

关键词： Curve fitting

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Fabrication and characterization of nanoporous Ag-Pt alloy

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Rare Metals 2021年第5期40卷 1203-1207页

作者： Tao Yin Fan-Yun Meng Min Zhang Ying-Wei Yan Beijing Key Laboratory of Traditional Chinese Medicine Protection and Utilization Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Engineering Research Centre of Natural Medicine Ministry of EducationFaculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China School of Mechanical Electronic and Control EngineeringMaterials Science and Engineering Research CenterBeijing Jiaotong UniversityBeijing 100044China

Nanoporous Ag-Pt bi-metallic alloy was fabricated by free dealloying of amorphous Ag-based precursor with the nominal composition of *** noble Ag and Pt were left after the less noble Cu and Si dissolved in a certain acid ***-continuous nanoporous microstructure was formed with asymmetric ligaments and pores with typically 30-200 nm in *** trace addition of Pt has refined the grains of the ligaments to the average size of less than 20 nm in the substrate and induced the formation of rods with *** morphologies of the rods were observed by scanning electron microscopy(SEM)and transmission electron microscopy(TEM)both in the form of clusters and as scattered individuals with characteristic length of several micrometers and diameter of tens of *** grains sizes in the rods were finer than those in the *** good mechanical integrity might be due to the combination of continuous ligaments and clusters of rods.

关键词： Nanoporous Ag-Pt alloy Amorphous precursor Dealloying Nanograins

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Multiscale Structural Characterization of a Smectic Liquid Crystalline Elastomer upon mechanical Deformation Using Neutron Scattering (vol 54, pg 10574, 2021)

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MACROMOLECULES 2021年第23期54卷 11209-11209页

作者： Li, Yuzhan Keum, Jong K. Wang, Jun Jiang, Naisheng Bras, Wim Kessler, Michael R. Rios, Orlando School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Center for Nanophase Materials Sciences and Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 United States Chemical Science Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 United States Department of Mechanical Engineering North Dakota State University Fargo North Dakota 58108 United States Department of Materials Science and Engineering The University of Tennessee Knoxville Tennessee 37996 United States

Liquid crystalline elastomers (LCEs) exhibit unique shape memory behavior due to the combination of liquid crystalline orientation and rubber elasticity. Multiscale structural characterization of these materials upon deformation is crucial to understanding their structure–property relationships. In this work, the structure evolution of an epoxy-based, main-chain LCE with deuterated flexible spacers upon uniaxial mechanical deformation is investigated at different length scales. Wide-angle and small-angle X-ray scattering (WAXS/SAXS) reveal the presence of smectic polymorphism and rotations of the smectic domains upon mechanical stretching, which is also confirmed by small-angle neutron scattering (SANS). Importantly, the selective deuteration enables an improved neutron scattering contrast between the smectic and amorphous domains. SANS patterns of the deformed, deuterated LCE exhibit strong scattering streaks that are not observed in SAXS or SANS of hydrogenated LCE, indicating the presence of highly aligned amorphous domains. The macroscopic orientation also results in the formation of structures in the micrometer scale revealed by the ultrasmall-angle neutron scattering (USANS) experiment.

关键词： Deformation Scattering Neutron scattering Liquid chromatography X-ray scattering

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Comparative Assessment of Compression Strength of Solid Biobriquette using Different Binding materials

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Journal of Nanomaterials 2023年第1期2023卷

作者： Bency, P. Anish, M. Jayaprakash, V. Jayaprabakar, J. Yanmaz, Ekrem Joy, Nivin Ramulu, Perumalla Janaki Department of Electrical and Electronics Engineering SRM Valliammai Engineering College Chennai India School of Mechanical Engineering Sathyabama Institute of Science and Technology Chennai India Department of Electrical and Electronics Engineering Nisantasi University Istanbul Turkey Department of Chemical and Materials Engineering Adama Science and Technology University Adama Ethiopia

Charcoal and firewood are the most common cooking fuels, despite the fact that they represent a variety of social and economic environmental difficulties in many affluent countries. Apart from the environmental implications of deforestation and resource loss, indoor air pollution caused by cooking with solid fuels causes 2 million fatalities each year. Biobriquettes are then utilized as a substitute for oils. Briquettes are also employed as carbon sources for cooking in various industries such as power plants, brick factories, and bakeries. Five specific binding materials were tested in this study for manual densification of cabbage waste, including beef tallow oil, starch, cassava binder, sodium silicate, and vinyl ester resin. The briquettes are made from a combination of 80% densified biological waste and 20% binder material. The sample density ranges from 545.564 to 591.278 kg/m3. The samples with the highest calorific value were beef tallow oil and vinyl ester resin, which had 5,357.26 and 5,800.79 kcal/kg respectively. The content of the samples were ashes, fixed carbon content, volatile material, and total humidity is 6.47% ± 1.13%, 18.43% ± 6%, 70.68% ± 6%, and 4.42% ± 4%, respectively. The sample with the most calorific value and densification is the one with the inorganic binder mixture. © 2023 P. Bency et al.

关键词： Resins

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High Frequency LLSAW Filters With Higher Order Modes Elimination Based on LiNbO3/SiO2/Sapphire Substrate

High Frequency LLSAW Filters With Higher Order Modes Elimina...

引用

IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Boyuan Xiao Sulei Fu Huiping Xu Peisen Liu Qiufeng Xu Xinchen Zhou Qiaozhen Zhang Rui Wang Cheng Song Fei Zeng Weibiao Wang Feng Pan Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing China College of Information Mechanical and Electrical Engineering Shanghai Normal University Shanghai China SHOULDER Electronics Limited Wuxi China

ISBN: (数字)9798350371901

ISBN: (纸本)9798350371918

In this study, we focus on developing high-frequency longitudinal leaky surface acoustic wave (LLSAW) filters with efficient suppression of spurious modes. A sapphire-based platform, chosen for its appropriate acoustic velocity, was systematically optimized to enhance LLSAW excitation while minimizing spurious modes. The dispersion characteristics were evaluated by finite element analysis, and robust main mode excitation and suppression of higher order modes was achieved through electrode thickness optimization. The resulting LLSAW resonators fabricated on 32°Y-45°X LiNbO 3 (LN)/SiO 2 /sapphire platform demonstrates substantial suppression of higher order modes over a frequency range from 3.5 to 7 GHz and achieve a maximum quality factor (Q max ) of 890 for LLSAW mode. Subsequently, 3.51 GHz, 4.08 GHz and 4.82 GHz LLSAW filter with insertion loss (IL min ) of 1.59 dB, 2.43 dB and 2.13 dB were realized, exhibiting excellent out-of-band (OoB) performance up to 7 GHz.

关键词： Electrodes Q-factor Surface acoustic waves Cutoff frequency Resonator filters Resonant frequency Finite element analysis Resonators Substrates Optimization

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