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2023 IEEE Symposium on Electromagnetic Compatibility and Signal/Power Integrity, EMC+SIPI 2023

作者： Anurakparadorn, Kanat Taub, Alan Michielssen, Eric University of Michigan Macromolecular Science and Engineering Program Department of Material Science and Engineering Ann ArborMI United States University of Michigan Department of Mechanical Engineering Ann ArborMI United States University of Michigan Department of Electrical Engineering and Computer Science Ann ArborMI United States

ISBN: (纸本)9798350309768

A strategy that combines experiment and simulation to design and optimize electromagnetic (EM) metamaterial absorbers containing a periodic porous structure is described. The approach provides the ability to produce absorbers that meet multiple user-specified objectives. Using the measured intrinsic properties of the baseline materials as an input to EM-field based computational modelling and optimization, absorption by the studied metamaterials measured by their reflection loss (RL) increases significantly. The resulting metamaterials have the potential for lower cost and lighter weight while providing greater protection than traditional metal gaskets and foams. © 2023 IEEE.

关键词： Metamaterials

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Does friction contribute to formability improvement using servo press?

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Friction 2023年第5期11卷 820-835页

作者： Kali PRASAD Aishwary GUPTA Hariharan KRISHNASWAMY Uday CHAKKINGAL Dilip K.BANERJEE Myoung-Gyu LEE Department of Mechanical Engineering Indian Institute of Technology MadrasChennai 600036India Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Metallurgical and Materials Engineering Indian Institute of Technology MadrasChennai 600036India Material Measurement Laboratory National Institute of Standards and Technology(NIST)Gaithersburg 20899USA

Servo press forming machines are advanced forming systems that are capable of imparting interrupted punch motion,resulting in enhanced room temperature *** exact mechanism of the formability improvement is not yet *** contribution of interrupted motion in the ductility improvement has been studied through stress relaxation phenomena in uniaxial tensile(UT)***,the reason for improved formability observed when employing servo press is complicated due to the additional contribution from frictional *** the present work,an attempt is made to decouple the friction effect on formability improvement *** improved formability is studied using a hole expansion test(HET).The limit of forming during hole expansion is modeled using the Hosford–Coulomb(HC)damage criteria,which is implemented as a user subroutine in a commercial explicit finite element(FE)*** the contribution of stress relaxation is accounted for in the evolution of the damage variable during interrupted ***,the difference between simulation and experimental hole expansion ratio(HER)can be used to decouple the friction effect from the overall formability improvement during hole *** improvement in HER due to stress relaxation and friction effect is *** study showed that the model effectively captures the hole expansion deformation process in both monotonic and interrupted loading *** to stress relaxation,friction effect played a major role during interrupted HET.

关键词： servo press hole expansion test(HET) dual phase steel finite element(FE)analysis Hosford-Coulomb(HC)ductile fracture model

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Modeling and Simulation of a Desiccant Coated Kirigami-Based Heat Exchanger

Modeling and Simulation of a Desiccant Coated Kirigami-Based...

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2024 ASHRAE Winter Conference

作者： Smith, Nathaniel Wei, Mingjun Yang, Zhiyao Liu, Mingzhe O’Neill, Zheng Yang, Shu Department of Mechanical Engineering Texas A&M University College StationTX United States Department of Material Science and Engineering University of Pennsylvania PhiladelphiaPA United States

ISBN: (纸本)9781955516822

Desiccant materials absorb water vapor directly from the air without the need to sensibly cool the air below its dewpoint temperature. This provides promising applications in the heating, ventilation, and air-conditioning (HVAC) to reduce energy consumption required for the air dehumidification process. Desiccant coated heat exchangers (DCHX) integrate desiccant materials onto heat exchangers as a compact implementation of desiccant dehumidification into HVAC systems. Compared with other methods of implementation, DCHXs offer better moisture absorption/desorption kinetics due to the active cooling/heating to the desiccant during the alternating dehumidification and regeneration processes. On the other hand, the coupled heat mass transfer with the absorption/desorption on DCHXs poses a challenging problem of a simulation model capable of describing the simultaneous processes for performance prediction, design, and control optimization. This paper describes the development of a model for a DCHX by combining a physics-based model of a hygroscopic hydrogel with a model of a water-cooled coil unit. The model is used to predict the dehumidification and regeneration performance of both a single-DCHX and a dual-DCHX operation of drying air. The model is also used to investigate the effects of key operation parameters including air flow rate and inlet air humidity. © 2024 ASHRAE.

关键词： Heat exchangers

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Exploring the Potential Utilization of Silicon Manganese Slag as a Supplementary Cementitious material for Cement Replacement in Developing Low-Carbon Composite Binders 1st

Exploring the Potential Utilization of Silicon Manganese Sla...

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1st International Conference on Net-Zero Built Environment: Innovations in materials, Structures, and Management Practices, NTZR 2024

作者： Hettiarachchi, Dileepa Samarakoon, S. M. Samindi M. K. Fosså, Kjell Tore Gebremariam, Kidane F. Khalifeh, Mahmoud Department of Structural and Mechanical Engineering and Material science University of Stavanger Stavanger Norway Museum of Archaeology University of Stavanger Stavanger Norway Department of Energy and Petroleum Engineering University of Stavanger Stavanger Norway

ISBN: (纸本)9783031696251

The continuous increase in demand for cement in the construction industry critically contributes directly to the global carbon dioxide (CO2) emission. Hence, numerous attempts are being made to reduce CO2 emissions in conjunction with cement production, named as low-carbon cement. This has boosted the enthusiasm for searching for alternatives, specifically supplementary cementitious materials (SCM) that are considered the most environmental and economical friendly method for mitigating CO2 emissions associated with the cement-based construction industry. The purpose of this study is to investigate silicon manganese slag (SiMn slag), a by-product of the metal industry as a sustainable alternative for partial replacements with traditional cement. An experimental investigation was conducted utilizing SiMn slag, primarily focusing on evaluating the compressive strength at 3, 7, 14, and 28 days for both binary and ternary sets of binders, the latter being coupled with ground granulated blast furnace slag. The study has investigated the different replacement levels of cement with SiMn slag up to 90% while maintaining water to binder ratio at 0.35. The microstructure and mineralogical analyses of the prepared hardened binders have been conducted using scanning electron microscopy (SEM) and X-ray diffraction (XRD) to identify phases, morphological changes, and various reaction products. The results indicate that the investigated binary mixture at 30% and 50% cement replacement levels, as well as the ternary mixture at a 50% cement replacement level, exhibited better compressive strength performances. The study suggests using SiMn slag as a supplementary cementitious material in binary or ternary mixtures, potentially achieving improved compressive strength even with higher levels of cement replacement. © The Author(s) 2025.

关键词： Binary mixtures

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Effect of chemical composition and microstructure on the thermal conductivity of Mg-Al-Ca alloys

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Keikinzoku/Journal of Japan Institute of Light Metals 2024年第1期74卷 9-13页

作者： Kirimoto, Yuichi Kondo, Natsuki Ito, Mizuki Tsukeda, Tadayoshi Aida, Tetsuo Tabata, Hironobu Kurihara, Hideki Suzuki, Mayumi Department of Nano and Functional Material Science Graduate School of Science and Engineering for Education University of Toyama 3190 Gofuku Toyama-shi Toyama930-8555 Japan School of Sustainable Design Materials and Engineering University of Toyama Toyama-shi Toyama Japan Program of Materials Science and Engineering Studies in Science and Engineering 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. Nakaniikawa-gun 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

In recent years, the increasing demand for electric vehicles, digital devices such as PCs and smartphones, and renewable energy storage systems has created a need for higher-performance batteries. Accordingly, the thermal conductivity of the case that houses the battery is becoming increasingly important. In this study, compositions with high thermal conductivity and good castability were investigated, focusing on Mg-Al-Ca alloys, and the relationship between the two was examined through thermal conductivity measurements and microstructural observations. As a result, the Mg-6%Al-4%Ca alloy was optimal in terms of castability and thermal conductivity. It was confirmed that a lower Al solid solution capacity and a higher purity of the matrix phase are important to improve the thermal conductivity. It is also suggested that the second phase, platelet Al2Ca, is likely to be recognized and enriched in the matrix, contributing to the improvement of thermal conductivity. The amount of Ca solid solution in the matrix was suggested to be reduced by the enrichment of Al in the matrix. The Ca solid solution in the matrix was found to be less effective in reducing thermal conductivity than the Al solid solution. © 2024 The Japan Institute of Light Metals.

关键词： Magnesium alloys

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Effect of ECAP temperature and deformation route on mechanical properties of pre-extruded Mg-5Gd-3Y-1Zn-0.5Zr alloys

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材料科学技术（英文版） 2025年第9期212卷 237-250页

作者： Xiaojie Zhou Haiyou Xia Jian Zhang Gang Zeng Xianzheng Lu Xiaomin Chen Xiaotong Pang Jiahao Li Jing Guo Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment Changsha University of Science and TechnologyChangsha 410114China Hunan Baohuifeng New Material Science & Technology Co. Ltd.Huaihua 418000China Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment Changsha University of Science and TechnologyChangsha 410114China Hunan Provincial Engineering Research Center of Wrought Magnesium Alloys and Surface Protection Changsha 410221China Hunan Baohuifeng New Material Science & Technology Co. Ltd.Huaihua 418000China

The effect of rotational-die equal channel angular pressing(RD-ECAP)temperature and deformation route on the microstructure and mechanical properties of pre-extruded Mg-5Gd-3Y-1Zn-0.5Zr(wt％)alloys were *** results indicate that the RD-ECAP updates both the α-Mg texture and long-period stack-ing ordered(LPSO)arrangement in the pre-extruded alloy,while the α-Mg texture is more sensitive to the change of deformation *** LPSO streamlines modify the anisotropy of mechanical properties of the ECAP alloys via exerting different reinforcing effects and modifying the crack *** lower ECAP temperature of 350 ℃ rather than 400 ℃ promotes dynamic precipitation which deteriorates the following ageing-hardening response but conduces to refining the α-Mg grains and preventing a sharp drop in elongation after peak *** 350A peak-aged alloy exhibits the optimal mechanical proper-ties with the average tensile yield strength(TYS)of 311 MPa(STYS=3.7,S indicates standard deviation)and elongation of 7.6％(SEL=0.7).Its higher strength should mainly be attributed to the finer grain size,and its quasi-isotropic performance should be inherited from the ECAP state induced by the rational arrangement of LPSO phases.

关键词： Mg alloys Long-period stacking ordered Equal channel angular pressing Microstructure mechanical property Anisotropy

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The Study of Cramer’s V for Variables Association on Stainless Steels Corrosion Problem 1

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4th International Conference on Mathematics, Statistics, and Computing Technology, ICMSCT 2023

作者： Afrianti, Yuli Sri Pasaribu, Udjianna Sekteria Ardy, Husaini Statistics Research Division Faculty of Mathematics and Natural Science Institut Teknologi Bandung Bandung Indonesia Material Science and Engineering Research Division Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Bandung Indonesia

ISBN: (数字)9789819734504

ISBN: (纸本)9789819734498

Stainless steel (SS) is a type of material used in the Oil and Gas Industry because of its corrosive resistance. A σ phase will be formed if SS is exposed to high temperatures for a long time. The appearance of σ occurs slowly, which is manifested by a change in the color of the SS surface. The presence of σ marked in dark blue indicates that the area has been corroded. This study is a follow-up study from the previous one aiming at testing the association between the variables involved in the SS corrosion problem. The material was processed with a series of treatments in the laboratory to produce images. Then, three locations were selected from the images to carry out a circular grid process and calculate the frequency of their color. The frequency listed in the contingency table was the data used to calculate the association between the location and color-based corrosion indicator variable using Chi-square and Cramer’s V. The result showed that although locations A, B, and C were from the different grain, location variables and corrosion indicator variables based on color were dependent. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Location

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Multi-functional and multi-scenario applications for MXene aerogels with synergistically enhanced asymmetric modules

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Nano Research 2024年第4期17卷 3359-3368页

作者： Junru Yao Jintang Zhou Feng Yang Guiyu Peng Yijie Liu Zhengjun Yao Fan Wu Haibo Zeng College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics) Ministry of Industry and Information TechnologyNanjing 211100China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

The development of multifunctional materials and synergistic applications of various functions are important conditions for integrated and miniaturized ***,we developed asymmetric MXene/aramid nanofibers/polyimides(AMAP)aerogels with different modules using an integrated molding *** asymmetric modules(layered MXene/aramid nanofibers section and porous MXene/aramid nanofibers/polyimides section)interactions are beneficial for enhanced performances,resulting in low reflection electromagnetic interference(EMI)shielding(specific shielding effectiveness of 2483(dB·cm^(3))/g and a low R-value of 0.0138),high-efficiency infrared radiation(IR)stealth(ultra-low thermal conductivity of 0.045 W/(m·K)and IR emissivity of 0.32 at 3–5μm and 0.28 at 8–14μm),and excellent thermal management performances of insulated Joule ***,these multifunctional AMAP aerogels are suitable for various application scenarios such as personal and building protection against electromagnetic pollution and cold,as well as military equipment protection against infrared detection and EMI.

关键词： multifunctional material electromagnetic interference shielding low reflection infrared radiation stealth thermal insulation Joule heating

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Silicon Manganese Slag as Supplementary Cementitious material in Low Carbon Composite Mortar 15th

Silicon Manganese Slag as Supplementary Cementitious Materia...

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15th fib International PhD Symposium in Civil engineering, 2024

作者： Hettiarachchi, Dileepa Samarakoon, S. M. Samindi M. K. Fosså, Kjell Tore Gebremariam, Kidane F. Khalifeh, Mahmoud Department of Structural and Mechanical Engineering and Material science University of Stavanger Norway Museum of Archaeology Department of Conservation University of Stavanger Norway Department of Energy and Petroleum Engineering University of Stavanger Norway

ISBN: (纸本)9782940643240

Mitigation of CO2 emissions linked to cement production stands as a critical issue, achievable through the integration of supplementary cementitious materials (SCMs). This strategy gains particular efficacy when utilizing locally accessible waste or by-product materials sourced from diverse industries. Silicon manganese (SiMn) slag, a by-product of the silicomanganese alloy manufacturing process, emerges as a promising supplementary cementitious material with optimum replacement to produce low carbon concrete mortar. An experimental campaign was conducted to replace cement in mortar with varying percentages of SiMn slag ranging from 30% up to 90% by weight of cement. The water to binder ratio was maintained at 0.35, supplemented with an admixture at 1.0% by weight of the total binder, to enhance its workability. Properties such as compressive strength (so far measured at 3, 7 and 28 days) and autogenous shrinkage were evaluated. Microstructure analysis, utilizing SEM and XRD methods, was carried out to identify phases and reaction products within the hardened mortar. Results indicated that mortars containing 30% to 50% of SiMn slag achieve comparable strength characteristics to that of control specimens. The study suggests that the SiMn slag used in this experiment is effective in achieving higher cement replacement rates. Hence, this has the potential to reduce the overall carbon footprint of the built environment and contribute to the sustainability of the cement industry. © Fédération Internationale du Béton–International Federation for Structural Concrete.

关键词： Slags

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Design and simulation of a combined flue gas and steam bagasse dryer to increase boiler efficiency of a sugar factory 2

Design and simulation of a combined flue gas and steam bagas...

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2nd International Conference on Future Technologies in Manufacturing, Automation, Design and Energy

作者： Kebede Nemomsa, Sololo Dessalegn Dejene, Naol Gopal, Mahesh Shunki Tibba, Getachew Tamiru Negari, Dinkisa Department of Mechanical Engineering College of Engineering and Technology Wollega University Post Box. No. 395 Nekemte Ethiopia Department of Mechanical Engineering and Material Science Faculty of Science and Technology University of Stavanger Stavanger Norway College of Electrical and Mechanical Engineering Addis Ababa Science and Technology University Addis Ababa Ethiopia

ISBN: (纸本)9789819912902

Bagasse is a sugar industry residue used to generate high-pressure steam that can be utilized to generate electricity. The moisture content of bagasse is a serious issue that lowers boiler efficiency. The study conducted in Arjo Diddesa sugar factory, its moisture level of the bagasse is above 52%, which impacts boiler efficiency. In this plant uses traditional SHRD technique, this uses waste flue gas to decrease moisture content. To reduce heat losses, steam is directed through the inner tube, while bagasse and flue gas are directed through the outer rotating cylinder, leading in interaction between indirect steam and direct flue gas-bagasse. ANSYS software is used for the development of drier and optimization by considering the input parameters for the SHRD are: flue gas mass flow rate, bagasse temperature, flow Pressure of flue gas. The SHRD system is tilted to the horizontal at an angle of 4° and rotates at a speed of 4.6 rpm to aid in transporting wet bagasse. The moisture in the bagasse is dropped from 52 percent to 45 percent, and increase in efficiency of a boiler from 71.5 percent to 74.5 percent theoretically. The initial GCV and NCV with 52% moisture content are 9137.6 kJ/kg and 7129.4 kJ/kg. After drying, the 45% of moisture content, the GCV and NCV of bagasse are 10484.8 kJ/kg and 8549.8 kJ/kg, respectively. The findings of the comparison show that the CV was raised by 1500 kJ/kg. © 2023 Elsevier Ltd. All rights reserved.

关键词： Flue gases

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