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Accelerated learning and co-optimization of elastocaloric effect and stress hysteresis of elastocaloric alloys

Rare Metals 2024年第12期43卷 6606-6624页

作者： Shi-Yu He Fei Xiao Rui-Hang Hou Shun-Gui Zuo Ying Zhou Xiao-Rong Cai Zhu Li Yan-Ming Wang Aysu Catal-Isik Enrique Galindo-Nava Xue-Jun Jin State Key Lab of Metal Matrix Composite School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Materials Genome Initiative Center Shanghai Jiao Tong UniversityShanghai200240China Institute of Medical Robotics Shanghai Jiao Tong UniversityShanghai200240China Department of Materials Science and Engineering Graduate School of EngineeringOsaka UniversityOsaka565-0871Japan University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghai200240China Department of Mechanical Engineering University College LondonTorrington PlaceLondonWC1E 7JEUK

The development of high-performance advanced elastocaloric alloys is crucial for the implementation of elastocaloric ***,we present a machine learning(ML)framework to accelerate the development of novel elastocaloric alloys with large adiabatic temperature change(ΔT_(ad))and low stress hysteresis(Δσ_(hy)).The comprehensive framework comprises database construction,feature selection,model construction,alloy design and validation,and model *** are selected according to the physical attributes they *** that may reflect the compatibility between parent and product phases,lattice distortion and the free energy in the alloy are considered in the *** them,the key features are selected by recursive feature elimination and exhaustive search *** trained models in combination with the Bayesian optimization method are exploited to achieve multi-objective *** to the results,a newly designed elastocaloric alloy shows a large adiabatic temperature change of 15.2 K and low average stress hysteresis of70.3 MPa at room temperature,which is consistent with our *** predictions of our ML model are interpreted by the Shapley additive exPlainations(SHAP)approach,which explicitly quantifies the effects of each feature in our model on the adiabatic temperature change and stress ***,we employ the Sureindependence screening and sparsifying operator(SISSO)method in conjunction with the key features to formulate explicit model.

关键词： Elastocaloric alloys Adiabatic temperature change Stress hysteresis Machine learning Multi-objective optimization

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Corrosion behavior of Mg-Zn-Zr-RE alloys under physiological environment-Impact on mechanical integrity and biocompatibility

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Journal of Magnesium and Alloys 2022年第6期10卷 1542-1572页

作者： Marwa AbdelGawad Chaudhry A.Usman Vasanth C.Shunmugasamy Ibrahim Karaman Bilal Mansoor Mechanical Engineering Program Texas A&M University at QatarEducation CityDoh1Qatar Department of Mechanical Engineering Texas A&M University3123 TAMUCollege StationTX 77843United States of America Department of Materials Science and Engineering Texas A&M University3003 TAMUCollege StationTX 77843United States of America

Benefits of RE addition on Mg alloys strength and corrosion resistance are widely reported but their effects on biodegradability and biocompatibility are still of *** paper investigates the effect of RE additions on biodegradability of Mg-Zn alloys under simulated physiological *** this context,two commercial Mg-Zn-Zr-RE alloys,namely ZE41 and EZ33,with same RE addition but different concentrations are studied in Hank’s Balanced Salt Solution(HBSS)at 37℃and with pH of ***-loss,hydrogen evolution,real-time insitu drop test,electrochemical impedance spectroscopy(EIS)and potentiodynamic polarization are deployed to study corrosion *** mechanical integrity of both alloys is assessed by mechanical testing post ***,in vitro biocompatibility is evaluated by indirect cytotoxicity tests using NIH3T3 *** reveal that although both alloys showed similar microstructure,size and distribution of precipitates played a significant role on its corrosion *** and open circuit potential results show stable film formation on EZ33,while ZE41 showed passive layer formation followed by its deterioration,over the analyzed time *** real-time drop test,it was shown in ZE41 alloy that both T-phase and Zr-rich precipitates acted as micro cathodes,resulting in an unstable surface *** EZ33,Zr-rich regions did not influence corrosion response,resulting in better corrosion resistance that was corroborated by post-immersion surface morphology *** higher degradation observed in ZE41 alloy resulted in higher drop in flexural and tensile strength compared to EZ33 *** addition,cytotoxicity tests on NIH3T3 cells revealed that cell viability of EZ33 increased with increasing incubation time,contrary to ZE41,owing to its lower biodegradation behavior and despite higher concentrations of *** results show that an increase in RE concentration in EZ33,relative to ZE41,had a positive effect on

关键词： Magnesium alloy Corrosion EIS mechanical integrity Cytotoxicity

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Zero Thermal Expansion Metamaterial Designs for Space Structures

Zero Thermal Expansion Metamaterial Designs for Space Struct...

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AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Lu, Wei-Chun Oudghiri-Idrissi, Othman Poli, Andrea Arruda, Ellen M. Tol, Serife Department of Mechanical Engineering University of Michigan 2350 Hayward St Ann ArborMI48109 United States Fariborz Maseeh Department of Civil Architectural and Environmental Engineering The University of Texas at Austin 301 E. Dean Keeton St AustinTX78712 United States Department of Mechanical Engineering Macromolecular Science and Engineering Program University of Michigan 2350 Hayward St Ann ArborMI48109 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

The precision of space structures is sensitive to high-temperature variation during on-orbit operations. This work develops zero thermal expansion (ZTE) metamaterials that can be integrated into space structures to restrict large thermal deformation under precision requirements. The proposed bi-material ZTE metamaterial beams show extremely low coefficients of thermal expansion (CTE) for a wide temperature variation. Static and dynamic analyses are conducted on the designed metamaterials for performance evaluation. The proposed ZTE beam elements are integrated into a 48-meter rib of a space RF antenna to enhance its thermal precision over a wide temperature range. Further, experimental validation of the ZTE truss beam design is conducted in a thermal chamber to demonstrate its low thermal deformation compared to a reference aluminum truss beam. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Trusses

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RIM Experiment on Fuel Adhesion Characteristics of Inclined-Wall-Impinging Spray under Cross-Flow Conditions 10

RIM Experiment on Fuel Adhesion Characteristics of Inclined-...

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10th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2022

作者： Zhang, Gengxin Shi, Penghua Luo, Hongliang Ogata, Yoichi Nishida, Keiya Department of Mechanical Systems Engineering Graduate School of Engineering University of Hiroshima Japan Mechanical Engineering Program Graduate School of Advanced Science and Engineering University of Hiroshima Japan

The impingement of fuel sprays on the piston surface significantly affects mixture formation, combustion performance, and pollutant emissions in Direct-Injection Spark-Ignition (DISI) engines. To better understand the fuel adhesion behavior, the fuel adhesion characteristics of fuel spray impinging on the flat wall under cross-flow condition were investigated in this work. Refractive Index Matching (RIM) were employed to observe the propagation of fuel adhesion. Then the area, mass, and thickness of fuel adhesion were evaluated under various cross-flow velocities. Also, the propagation mechanism and lifetime prediction of fuel adhesion under the cross-flow conditions were revealed. The experimental results can provide necessary guidance on the operating conditions of airflow inside the engine. © 2022 by the Japan Society of mechanical Engineers All rights reserved.

关键词： Adhesion

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The Effects of Externally Magnetic Fields and Electrically Conducting Lubricants at Transient Squeeze MEHL Motion with Elastic Coating

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Journal of the Chinese Society of mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao 2022年第1期43卷 29-35页

作者： Chu, Li-Ming Chang, Yuh-Ping Cai-Wan, Chang-Jian Interdisciplinary Program of Green and Information Technology National Taitung University Taitung95092 Taiwan Department of Mechanical Engineering Kun Shan University Tainan71070 Taiwan Department of Mechanical and Automation Engineering I-Shou University Kaohsiung84001 Taiwan

The pure squeeze magneto-elastohydrodynamic lubrication (MEHL) motion of point contacts with an electrically conducting fluid in transverse magnetic field on elastic coating is explored under constant load process. The modified Reynolds, the rheology, the force balance, and the elastic deformation equations must be solved simultaneously to obtain the transient pressure profiles, film shapes, elastic deformation, and normal squeeze velocities. The differences between classical EHL and MEHL are discussed during the pure squeeze process. The simulation results reveal that the effect of externally applied magnetic field is equivalent to enhancing the effective lubricant viscosity. Therefore, as the Hartmann number (M) increases, the effect becomes more obvious. The larger the Hartmann number, the thicker the central film thickness and minimum film thickness, the smaller the maximum central pressure, the later the maximum central pressure and the dimple are formed, the smaller the central normal squeeze velocity. The central pressure decreases with increasing M at the initial stage. The central pressure increases with increasing M at the deformation stage. © 2022, Chinese mechanical engineering Society. All right reserved.

关键词： Magnetos

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optimization of Configuration Hybrid Power Generation System at Oil Refinery 4

optimization of Configuration Hybrid Power Generation System...

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4th International Conference on High Voltage engineering and Power Systems, ICHVEPS 2023

作者： Syafputra, Muhamad Apriyudi Waluyo, Joko Imawan, Roni Universitas Gadjah Mada Magister Program in System Engineering Yogyakarta Indonesia Universitas Gadjah Mada Department of Mechanical and Industrial Engineering Yogyakarta Indonesia Universitas Gadjah Mada Department of Electrical Engineering Yogyakarta Indonesia

ISBN: (纸本)9798350318678

The oil refinery industry has a potential emission reduction by combining its fossil fuel with Renewable Energy usage. One alternative to reduce carbon emissions is the hybrid power system using solar panels for electricity generation. This research will observe the optimum scenario for utilizing a hybrid power system. The research subject is observed refinery facilities that will be built in Indonesia, where the electricity source used formerly comes from fossils. The monitored parameters are Cost of Energy (COE) and carbon emission. optimization involves three scenarios involving basic and hybrid configurations. The basic scenario is the initial configuration of the electricity supply with power source from the generator and PLN (national's utility). The first scenario is a hybrid power plant utilizing the roofs of existing buildings in the refinery area. The second is a hybrid power plant with a battery to supply electricity at night, at the capacity of renewable energy (RE) of 20% and 40%. Compared to the basic scenario, scenario 1 increases COE by 0.17% and reduces carbon emission at 0.3% compared to the basic scenario. Scenario 2 with 20% and 40% of renewable energy are obtained at COE of 4.7% and 44.3%, while reducing emissions occurred at 38% and 52.7%, respectively. The scenario of a hybrid power system with a 20% renewable energy is the optimal result compared to the other scenarios. © 2023 IEEE.

关键词： Renewable energy resources

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Advancements in Geopolymer Concrete for Marine Infrastructure: An Optimization of Performance Considering Workability, Compressive Strength, Capillary Water Absorption, Porosity, and Chloride Migration

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Iranian Journal of Science and Technology - Transactions of Civil engineering 2024年 1-14页

作者： Shahedan, Noor Fifinatasha Hadibarata, Tony Jusoh, Muhammad Noor Hazwan Isia, Ismallianto Bouaissi, Aissa Juwono, Filbert Hilman Nawawi, Natasha Ahmad Kusumaningrum, Hermin Pancasakti Muslim, Abrar Hidayat, Topik Environment Engineering Program Curtin University Malaysia Miri CDT 250 Malaysia School of Engineering University of Plymouth Plymouth PL4 8AA United Kingdom Department of Electrical and Electronic Engineering Xi’an Jiaotong – Liverpool University Suzhou China School of Mechanical Engineering College of Engineering Universiti Teknologi MARA Shah Alam 40450 Malaysia Biotechnology Study Program Department of Biology Faculty of Science and Mathematics Universitas Diponegoro Semarang Indonesia Department of Chemical Engineering Faculty of Engineering Universitas Syiah Kuala Banda Aceh Indonesia Biology Study Program Faculty of Mathematics and Science Education Universitas Pendidikan Indonesia Bandung Indonesia

This research investigates the effectiveness of geopolymer concrete incorporating fly ash in environments rich in chlorides;in contrast to conventional Portland cement concrete (OPC). The study emphasizes essential characteristics such as workability, mechanical strength, capillary water absorption, open porosity, and chloride migration. The experiments demonstrated that geopolymer concrete exhibits a 30% enhancement in slump values, reflecting improved workability, and its compressive strength rose by 14.90–23.94% when compared with OPC. A significant reduction in binder content led to a notable decrease in capillary water absorption, highlighting a positive impact on long-term durability. With time, geopolymer concrete showed a reduction in open porosity and chloride migration coefficient, indicating better resistance to chloride penetration in marine settings. Although these outcomes underscore the potential of geopolymer concrete to improve structural durability, especially in marine infrastructure, additional optimization is required to tackle its relatively higher capillary water absorption and chloride migration during the initial stages. These results contribute to the ongoing investigation of sustainable building materials, offering valuable insights into geopolymer concrete’s ability to endure severe chloride exposure and serve as a durable solution for corrosion management in marine infrastructure. © The Author(s), under exclusive licence to Shiraz University 2024.

关键词： Durability Geopolymer concrete Marine environments Mix design Sustainable construction

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Path Optimization and Control of Mobile Robot Using Modified Cuckoo Search Algorithm 1

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2nd Conference of Innovative Product Design and Intelligent Manufacturing System, IPDIMS 2020

作者： Kumar, Saroj Parhi, D.R.K. Kashyap, Abhishek K. Vikas Robotics Laboratory Department of Mechanical Engineering National Institute of Technology Odisha Rourkela769008 India

ISBN: (数字)9789811902963

ISBN: (纸本)9789811902956

Cuckoo search (CS) algorithm is a nature-inspired metaheuristic optimization algorithm. This algorithm is rooted on the brood parasitism of cuckoo bird. The modified algorithm is applied on path optimization of mobile robot in unknown space. The optimization algorithm is getting the primary inputs from the sensors of mobile robot. The inputs are obstacles distance and heading angle. For authentication of proposed algorithm, simulation in V-rep software and real-time experiment through Khepera-III robot is performed. The results acquired by the simulation and experiments are equated with each other and observed a good promise between both the results as the difference in results is less than 5%. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Mobile robot Navigation Optimization V-rep

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Task-defined Pulley Design for Nonlinearly Coupled Tendon-driven Actuation

Task-defined Pulley Design for Nonlinearly Coupled Tendon-dr...

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IEEE International Conference on Soft robotics (RoboSoft)

作者： Wensi Zhang Barnabas Gavin Cangan Thomas Buchner Alexander M. Kübler Ramon Asmus Robert K. Katzschmann Department of Mechanical and Process Engineering Soft Robotics Lab ETH Zurich

Coupled actuation is a common strategy for reducing the number of actuators in robots with high degrees of freedom. Coupled actuation leads to an underactuation that lowers system complexity and weight. However, an approach for a controlled nonlinear coupling of multiple tendons does not exist for tendon-driven actuation. We propose a method to enable task-defined non-linearly coupled actuation by designing eccentric pulleys of variable radii. Given a target profile of tendon length changes, we perform piecewise fitting of the target curve to generate a composite pulley geometry. Theoretical verification of the method with 200 randomly generated tendon profiles shows stable results with an average of 2.19 % relative error. In addition, we built a practical demonstration by implementing non-linearly coupled control of a tendon-driven finger. The six tendons that control the robotic finger were all actuated using pulleys connected to a single motor, resulting in a 5.35 % average fingertip orientation tracking error. In conclusion, the pulley-shaping method proposed in this project enables the task-defined nonlinear coupling of multiple degrees of freedom to a single actuator of tendon-driven systems. We believe that the algorithm's generalizability will enable further practical use in tendon-driven dexterous hands, animatronics, manipulators, and legged robots, among various other possible applications.

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Investigation of the Effects of Temperature and Contact Pressure on the Friction Coefficient in Uncoated PHS2000 Steel Plates 12th

Investigation of the Effects of Temperature and Contact Pres...

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12th Brazilian Manufacturing engineering Congress, COBEF 2023

作者： dos Santos Silva, Bruno Caetano Seixas, Luã Fonseca Folle, Luis Fernando Dourado, Alexandre Ferraz Lima, Tiago Nunes Coelho, Rodrigo Santiago Batalha, Gilmar Ferreira Salvador Brazil Department of Mechatronics and Mechanical Systems Engineering Polytechnic School of Engineering University of Sao Paulo Sao Paulo Brazil Postgraduate Program MPDS/GETEC/MCTI SENAI CIMATEC Salvador Brazil

ISBN: (纸本)9783031435546

Manganese-boron steels are widely used in hot stamping, resulting in 1500 MPa (PHS 1500) or even 2000 MPa (PHS 2000) tensile strength after the hot stamping process. These steels are most commonly used in industry in the form of AlSi-coated sheets. However, recent developments are being made to enable the application of uncoated steels, resulting in cost reduction, but bringing technological challenges to be overcome. The coefficient of friction (µ) is a fundamental parameter in sheet metal forming and is influenced by several factors, such as: surface roughness, working temperature, lubrication, contact pressure and sliding speed. In hot stamping, it is known that the temperature can have a great influence on µ values for coated plates, but there is little information about uncoated steels. This work aims to investigate the tribological behavior of uncoated PHS 2000 steel plates using the pin-on-disk test. Tests were carried out under three temperatures (800 °C, 600 °C and 400 °C) and contact pressures of 5 and 10 MPa. Results showed that the friction coefficient tends to reduce with increasing temperature at a pressure of 5 MPa, as result of oxide formation on the steel’s surface. However, at a pressure of 10 MPa, this reduction was not observed. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Temperature

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