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Design and Simulation of a Maintenance-friendly and Cost-effective Molten Aluminum Alloy Casting Mechanism

Sensors and materials 2024年第7期36卷 2955-2964页

作者： Bakhtiar, Budhi Wang, Nai-Hsien Hsu, Chao-Ming Fan, Kuo-Kuang Yang, Cheng-Fu Cai, Deng-Chuan Graduate School of Design National Yunlin University of Science & Technology Douliou Yunlin640 Taiwan Electro Engineering Department Padang State Polytechnics West-Sumetera Indonesia Department of Mechanical Engineering National Kaohsiung University of Science and Technology Kaohsiung807 Taiwan Department of Chemical and Materials Engineering National University of Kaohsiung Kaohsiung811 Taiwan Department of Aeronautical Engineering Chaoyang University of Technology Taichung413 Taiwan Department of Industrial Design National Yunlin University of Science and Technology Douliou Yunlin640 Taiwan

The aim of this research was to design and simulate a low-cost, easy-to-maintain molten aluminum alloy casting mechanism. This mechanism was intended to address labor shortages in harsh and high-temperature environments. The functional requirements of the mechanism were as follows: it needed to withstand temperatures exceeding 700 ℃, operate without deformation, and ensure that the ladle’s positioning error during each rotation did not exceed 1 deg. Additionally, the mechanism’s durability had to meet industry standards, with the ladle’s output shaft capable of bearing pressures exceeding 100 kg/cm2. The design should be modular, allowing for the replacement of specific components to accommodate varying specifications in the future. To begin with, a 3D model was constructed using SolidWorks CAD software to verify operational interferences and simulate assembly, ensuring that the design was practical and logically sound. During the design process, mechanical design handbooks and catalogs from major component suppliers were consulted to utilize standard sizes and specifications as much as possible. Once the model was confirmed, structural analyses were conducted using Ansys to ensure that the mechanism could withstand significant loads without failure. Furthermore, the design would focus on ensuring that the mechanism was robust and reliable under high-temperature conditions, reducing the need for frequent maintenance and downtime. The modular design approach not only enhances the flexibility of the mechanism but also simplifies future upgrades and adjustments, ensuring long-term usability and adaptability. © 2024 M Y U Scientific Publishing Division. All rights reserved.

关键词： Aluminum alloys

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Applicability of unique scarf joint configuration in friction stir welding of AA6061-T6:Analysis of torque,force,microstructure and mechanical properties

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Defence Technology（防务技术） 2022年第4期18卷 567-582页

作者： Durjyodhan Sethi Uttam Acharya Shashank Shekhar Barnik Saha Roy Department of Mechanical Engineering National Institute of Technology AgartalaBarjalaJiraniaWest TripuraPin-799046India Department of Materials Science and Engineering Indian Institute of Technology KanpurKanpur208016India

The present research introduces a unique concept of scarf joint technique in friction stir welding(FSW) of aluminum alloy AA 6061-T6 plates and an investigation on weld quality.A new joint configuration with two distinct scarf angles(75°and 60°) was considered in this *** various aspects of welding were compared with contemporary simple square butt(SSB) joint *** was carried out at a constant tool rotation speed(TRS),tool traverse speed(TTS) and tool tilt angle of 1100 rpm,2 mm/s and2°,*** results are analyzed in terms of force and torque distribution,microstructure,macrostructure,and mechanical property perspective for different joint *** study reveals the minimum amount of force and torque at 60°scarf angle joint configuration compared to that of square butt joint *** study shows that all the joints were defect-free,and a prominent onion ring was present in the lower portion of the weld nugget(WN).Fine equiaxed grains with a minimum average grain size diameter of 6.82 μm were obtained in the WN of scarf joint configuration(SJC).The maximum ultimate tensile strength(UTS) and maximum average NZ hardness of 267 MPa and83.82 HV0.1were obtained in SJC3 at a scarf angle of 60°.It has been observed from the investigation that the joint efficiency increases from 72.5%(SSB) to 86%(SJC3) at a 60° scarf *** unique characteristic may lay an impetus on probable joint strength enhancement technique without increasing the production cost.

关键词： Friction stir welding Joint configuration Al alloys Force and torque Microstructure mechanical property

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Microstructure evolution and mechanical properties of Al_(2)O_(3)foams via laser powder bed fusion from Al particles

Advanced Powder Materials

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Advanced Powder materials 2023年第4期2卷 114-123页

作者： Ye Dong Annan Chen Ting Yang Shuai Gao Shuning Liu Bingjian Guo Hongyi Jiang Yusheng Shi Chunze Yan School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of EducationWuhan 430074China Centre for Advanced Structural Materials Department of Mechanical EngineeringCity University of Hong KongHong KongChina

Laser powder bed fusion(LPBF)combined with reaction bonding(RB)of Al particles is an effective method for preparing high-performance 3D Al_(2)O_(3) ceramic ***,the indistinct microstructure evolution hinders the regulation of pore features and the improvement of synthetic ***,the microstructure evolution of the Al_(2)O_(3) ceramic foams during the LPBF/RB process is clariﬁed by various characterization methods,and the corresponding mechanical property modulation is realized by optimizing LPBF parameters,organic binder(E12 epoxy resin)content,heating rate,sintering time,and coral-like Al_(2)O_(3) *** expansion from Al_(2)O_(3) outward growth and Al granule precipitation counteracts the shrinkage from E12 decomposition and Al_(2)O_(3) sintering,resulting in an ultra-low shrinkage of 0.94%–3.01%.The pore structures of particle packing pores,hollow spheres,and microporous structures allow a tunable porosity of 52.6%–73.7%.The in-situ formation of multi-scale features including hollow spheres,ﬂaky grains,whiskers,nanoﬁbers,and bond bridges brings about a remarkably high bending strength of 6.5–38.3 ***ﬁndings reveal the relationship between microstructure evolution and property optimization of high-performance ceramic foams,with potential signiﬁcance for microstructure design and practical application.

关键词： Al_(2)O_(3)ceramic foams Laser powder bed fusion Reaction bonding Microstructure evolution mechanical property modulation

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Double-sided friction stir welding of Nitronic-40 stainless steel for application in tokamak devices

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Journal of materials science & Technology 2023年第28期159卷 170-183页

作者： Supreeth Gaddam Ravi Sankar Haridas Deepthi Tammana Charlie Sanabria Christopher J.Lammi Diana Berman Rajiv S.Mishra Center for Friction Stir Processing Department of Materials Science and EngineeringUniversity of North TexasDentonTX76207USA Advanced Materials and Manufacturing Processes Institute University of North TexasDentonTX76207USA Department of Mechanical Engineering University of North TexasDentonTX76207USA Commonwealth Fusion Systems CambridgeMAUSA

Nitrogen containing austenitic stainless steels(N-ASS)are widely utilized to fabricate various structural components in tokamak type fusion reactors owing to their suitable mechanical and functional *** components are exposed to a range of temperatures(4-500 K)and interact closely with the magnetic fields that are used to control and contain the plasma within the tokamak ***-40(N40)or XM-11 stainless steel is one such N-ASS used for fabricating structural components in the mag-netic and vacuum vessel systems in tokamak *** of most of the larger components in the magnetic and vacuum vessel systems typically involves some type of fusion-based welding *** study presents a double-sided friction stir welding(FSW)approach as an alternative to fusion welding processes to join 12 mm thick N40 plates to obtain joints with a low fraction ofδferrite(a detrimen-tal ferromagnetic phase),high joint efficiency,no sensitization and loss of hardness in the heat affected zone,and minimal nitrogen desorption from the weld *** double-sided FSW approach yielded superior weldments when compared to similar joints accomplished by fusion welding for application in tokamak devices.

关键词： Friction stir welding Nitronic-40 stainless steel XM-11 stainless steel Magnetic and vacuum vessel systems Tokamak devices

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Design of Flexible Piezoelectric Nanocomposite for Energy Harvesters:A Review

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Energy Material Advances 2023年第1期4卷 377-392页

作者： Fu Lv Zijian Hong Zeeshan Ahmad Hanying Li Yongjun Wu Yuhui Huang School of Materials Science and Engineering Zhejiang UniversityHangzhouZhejiang 310027China State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang UniversityHangzhouZhejiang 310027China Department of Mechanical Engineering Texas Tech UniversityLubbockTXUSA MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhouZhejiang 310027China

Piezoelectric materials that can effectively convert natural mechanical energy into electrical energy without time and space constraints have been widely applied for energy harvesting and *** piezocomposites with high piezoelectricity and flexibility have shown great promise for renewable electric energy generation that can power implantable and wearable *** minireview aims to summarize the recent progress of the piezocomposites with different composite structures,as well as the role of the theoretical understandings and designs in the development of new piezoelectric nanogenerator ***,the most common composite structural types(0-3,1-3,and 3-3)have been discussed *** strategies for high output performance of piezocomposites are also proposed on the basis of current experimental and simulation ***,the review concludes with perspectives on the future design of flexible piezoelectric nanocomposites for energy harvesters.

关键词： composite piezoelectric harvesting

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Bayesian optimization with active learning of design constraints using an entropy-based approach

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npj Computational materials 2023年第1期9卷 1866-1879页

作者： Danial Khatamsaz Brent Vela Prashant Singh Duane D.Johnson Douglas Allaire Raymundo Arróyave J.Mike Walker’66 Department of Mechanical Engineering Texas A&M UniversityCollege StationTX 77843USA Department of Materials Science and Engineering Texas A&M UniversityCollege StationTX 77843USA Ames Laboratory U.S.Department of EnergyIowa State UniversityAmesIA 50011USA Department of Materials Science&Engineering Iowa State UniversityAmesIA 50011USA Department of Industrial and Systems Engineering Texas A&M UniversityCollege StationTX 77843USA

The design of alloys for use in gas turbine engine blades is a complex task that involves balancing multiple objectives and *** alloys must be ductile at room temperature and retain their yield strength at high temperatures,as well as possess low density,high thermal conductivity,narrow solidification range,high solidus temperature,and a small linear thermal expansion *** Integrated Computational materials engineering(ICME)methods are not sufficient for exploring combinatorially-vast alloy design spaces,optimizing for multiple objectives,nor ensuring that multiple constraints are *** this work,we propose an approach for solving a constrained multi-objective materials design problem over a large composition space,specifically focusing on the Mo-Nb-Ti-V-W system as a representative Multi-Principal Element Alloy(MPEA)for potential use in next-generation gas turbine *** approach is able to learn and adapt to unknown constraints in the design space,making decisions about the best course of action at each stage of the *** a result,we identify 21 Pareto-optimal alloys that satisfy all *** proposed framework is significantly more efficient and faster than a brute force approach.

关键词： alloys solidification alloy

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

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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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Preliminary Investigation of Spring-Based Gravity Compensation for an Upper Limb Assistive Robot

Preliminary Investigation of Spring-Based Gravity Compensati...

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2025 IEEE International Conference on Mechatronics, ICM 2025

作者： Jiang, Ming Wang, Yang Meng, Qizhi Kuo, Chin-Hsing Ceccarelli, Marco Sugahara, Yusuke Takeda, Yukio Institute of Science Tokyo Department of Mechanical Engineering Tokyo Japan School of Mechanical Materials Mechatronic and Biomedical Eng. University of Wollongong Wollongong Australia University of Rome Tor Vergata Department of Industrial Engineering Rome Italy

ISBN: (纸本)9798331533892

Upper limb assistive robots have been widely developed due to their ability to aid user movement and reduce caregiver workload. In our previous work, we introduced a wearable end-effector-type upper limb assistive robot, WELiBot. To enhance the robot's portability and reduce the required actuation torque, this work investigates gravity compensation for WELiBot's mechanism using springs. Following the 1-DOF gravity compensation principle, springs were designed for lifting and reaching movement respectively. The effectiveness of this compensation effect was then evaluated by comparing the necessary torque at the actuating joints with and without springs. This work offers insight into gravity compensation for parallel mechanisms and contributes to the future development of WELiBot. © 2025 IEEE.

关键词： End effectors

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Optimising degradation and mechanical performance of additively manufactured biodegradable Fe–Mn scaffolds using design strategies based on triply periodic minimal surfaces

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Smart materials in Medicine 2024年第1期5卷 127-139页

作者： Dargusch, Matthew S. Soro, Nicolas Demir, Ali Gokhan Venezuela, Jeffrey Sun, Qiang Wang, Yuan Abdal-hay, Abdalla Alali, Aya Q. Ivanovski, Saso Previtali, Barbara Kent, Damon School of Mechanical and Mining Engineering The University of Queensland Advanced Engineering Building Bld 49 Staff House Rd St LuciaQLD4072 Australia Department of Mechanical Engineering Politecnico di Milano Via La Masa 1 Milan20156 Italy School of Dentistry The University of Queensland Herston Campus 4072 Australia Department of Engineering Materials and Mechanical Design Faculty of Engineering South Valley University Qena83523 Egypt Faculty of Industry and Energy Technology Mechatronics Technology Program New Cairo Technological University New Cairo - Fifth Settlement Cairo11835 Egypt School of Science Technology and Engineering University of the Sunshine Coast Maroochydore BCQLD4558 Australia

Additively manufactured lattices based on triply periodic minimal surfaces (TPMS) have attracted significant research interest from the medical industry due to their good mechanical and biomorphic properties. However, most studies have focussed on permanent metallic implants, while very little work has been undertaken on manufacturing biodegradable metal lattices. In this study, the mechanical properties and in vitro corrosion of selective laser melted Fe–35%Mn lattices based on gyroid, diamond and Schwarz primitive unit-cells were comprehensively evaluated to investigate the relationships between lattice type and implant performance. The gyroid-based lattices were the most readily processable scaffold design for controllable porosity and matching the CAD design. mechanical properties were influenced by lattice geometry and pore volume. The Schwarz lattices were stronger and stiffer than other designs with the 42% porosity scaffold exhibiting the highest combination of strength and ductility, while diamond and gyroid based scaffolds had lower strength and stiffness and were more plastically compliant. The corrosion behaviour was strongly influenced by porosity, and moderately influenced by geometry and geometry-porosity interaction. At 60% porosity, the diamond lattice displayed the highest degradation rate due to an inherently high surface area-to-volume ratio. The biodegradable Fe–35Mn porous scaffolds showed a good cytocompatibility to primary human osteoblasts cells. Additive manufacturing of biodegradable Fe–Mn alloys employing TPMS lattice designs is a viable approach to optimise and customise the mechanical properties and degradation response of resorbable implants toward specific clinical applications for hard tissue orthopaedic repair. © 2023 The Authors

关键词： Porosity

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Graphene-calcium carbonate coating to improve the degradation resistance and mechanical integrity of a biodegradable implant

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Journal of Magnesium and Alloys 2024年第1期12卷 394-404页

作者： Lokesh Choudhary Parama Chakraborty Banerjee R.K.Singh Raman Derrek E.Lobo Christopher D.Easton Mainak Majumder Frank Witte Jörg F.Löffler Department of Mechanical and Aerospace Engineering Monash UniversityClayton CampusMelbourneVIC 3800Australia Department of Chemical and Biological Engineering Monash UniversityClayton CampusMelbourneVIC 3800Australia Nanoscale Science and Engineering Laboratory(NSEL) Bldg 37Monash UniversityClayton CampusMelbourneVIC 3800Australia CSIRO Materials Science and Engineering Bayview AvenueClaytonVIC 3168Australia Julius Wolff Institute and Berlin Brandenburg Center for Regenerative Therapies Charité–Universitätsmedizin BerlinAugustenburger Platz 113353 BerlinGermany Laboratory of Metal Physics and Technology Department of MaterialsETH Zurich8093 ZurichSwitzerland

Biodegradable implants are critical for regenerative orthopaedic procedures,but they may suffer from too fast corrosion in human-body *** necessitates the synthesis of a suitable coating that may improve the corrosion resistance of these implants without compromising their mechanical *** this study,an AZ91 magnesium alloy,as a representative for a biodegradable Mg implant material,was modified with a thin reduced graphene oxide(RGO)-calcium carbonate(CaCO_(3))composite *** analytical and in-vitro electrochemical characterization reveals that this coating significantly improves the corrosion resistance and mechanical integrity,and thus has the potential to greatly extend the related application field.

关键词： Graphene coating Biodegradable implant Hydroxyapatite Corrosion Magnesium alloy

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