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Advancing optothermal manipulation:decoupling temperature and flow fields in quasi-isothermal microscale streaming

Light(science & Applications) 2023年第9期12卷 1713-1714页

作者： Youngsun Kim Yuebing Zheng Materials Science and Engineering Program and Texas Materials Institute The University of Texas at AustinAustinTX78712USA Walker Department of Mechanical Engineering The University of Texas at AustinAustinTX78712USA

By decoupling temperature and flow fields through symmetry-correlated laser scan sequences,ISO-FLUCS enables quasi-isothermal optofluidic microscale *** technique offers precise control over fluid manipulation while m... 详细信息

关键词： thermal isothermal flow

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Quantification of grain boundary effects on the geometrically necessary dislocation density evolution and strain hardening of polycrystalline Mg-4Al using in situ tensile testing in scanning electron microscope and HR-EBSD

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Journal of Magnesium and Alloys 2024年第5期12卷 1815-1829页

作者： Eunji Song Mohsen Taheri Andani Amit Misra Department of Materials Science and Engineering University of MichiganAnn ArborMI 48109USA Department of Mechanical Engineering University of MichiganAnn ArborMI 48109USA Department of Mechanical Engineering Texas A&M UniversityCollege StationTX 77843USA

In situ tensile testing in a scanning electron microscope(SEM)in conjunction with high-resolution electron backscatter diffraction(HR-EBSD)under load was used to characterize the evolution of geometrically necessary dislocation(GND)densities at individual grain boundaries as a function of applied strain in a polycrystalline Mg-4Al *** increase in GND density was investigated at plastic strains of 0%,0.6%,2.2%,3.3% from the area including 76 grains and correlated with(i)geometric compatibility between slip systems across grain boundaries,and(ii)plastic *** develop expressions for the grain boundary GND density evolution as a function of plastic strain and plastic incompatibility,from which uniaxial tensile stress-strain response of polycrystalline Mg-4Al are computed and compared with experimental *** findings in this study contribute to understanding the mechanisms governing the strain hardening response of single-phase polycrystalline alloys and more reliable prediction of mechanical behaviors in diverse microstructures.

关键词： Mg-Al alloys Grain boundaries Geometrically necessary dislocations Strain gradient plasticity HR-EBSD

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Martensitic transformation induced strength-ductility synergy in additively manufactured maraging 250 steel by thermal history engineering

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材料科学技术（英文版） 2025年第8期211卷 212-225页

作者： Shahryar Mooraj Shuai Feng Matthew Luebbe Matthew Register Jian Liu Tianyi Li Baris Yavas David P.Schmidt Matthew W.Priddy Michael B.Nicholas Victor K.Champagne Mark Aindow Haiming Wen Wen Chen Department of Mechanical and Industrial Engineering University of Massachusetts AmherstAmherstMA 01003USA Department of Materials Science and Engineering Missouri University of Science and TechnologyRollaMO 65409USA Department of Mechanical Engineering Mississippi State UniversityMS 39759USA X-Ray Science Division Argonne National LaboratoryArgonneIL 60439USA Department of Materials Science and Engineering & Institute of Materials Science University of Connecticut25 King Hill RoadStorrsCT 06269USA DEVCOM-Army Research Laboratory Aberdeen Proving GroundMD 21005USA

Maraging steels are known for their exceptional strength but suffer from limited work hardening and ***,we report an intermittent printing strategy to tailor the microstructure and mechanical properties of maraging 250 steel via tuning the thermal history during wire-arc directed energy *** introducing a dwell time between adjacent layers,the maraging 250 steel is cooled below the martensite start temperature,triggering thermally-driven martensitic transformation during the printing *** cycling during subsequent layer deposition results in the formation of reverted austen-ite which shows a refined microstructure and induces elemental segregation between martensite and reverted *** Ni enrichment in the austenite promotes stabilization of the reverted austen-ite upon cooling to room *** reverted austenite is metastable during deformation,leading to strain-induced martensitic transformation under ***,a 3 min interlayer dwell time produces a maraging 250 steel with approximately 8％reverted austenite,resulting in improved work hardening via martensitic transformation induced plasticity during ***,the higher cooling rate and refined prior austenite grains lead to substantially refined martensitic grains(by approx-imately fivefold)together with an increased dislocation *** 3 min interlayer dwell time,the yield strength of the printed maraging 250 steel increases from 836 MPa to 990 MPa,and the uniform elongation is doubled from 3.2％to 6.5％.This intermittent deposition strategy demonstrates the potential to tune the microstructure of maraging steels for achieving strength-ductility synergy by engineering the thermal history during additive manufacturing.

关键词： Additive manufacturing Maraging steel mechanical properties Martensitic transformation Thermal history

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Multi-response Optimization of Process Parameters in Stretch Blow Molding of PET Plastic Bottles

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Journal of The Institution of Engineers (India): Series D 2024年 1-15页

作者： Merga, Henok Hailu Sinha, Devendra Kumar Getachew, Aklilu Workneh, Melese Rathee, Devender Singh Department of Mechanical Engineering School of Mechanical Chemical and Materials Engineering Center of Excellence Advanced Manufacturing Engineering Adama Science and Technology University Adama Ethiopia Department of Electronics Engineering School of Electrical Engineering and Computing Adama Science and Technology University Adama Ethiopia

Plastic waste in Polyethylene Terephthalate (PET) bottles is creating new challenges, which in today’s scenario is a major concern in every industry. The defect in PET bottles mainly occurs due to improper selection of levels of process parameters during the production process. Therefore, optimizations of process parameters are very important to minimize the defects produced due to improper stretch blow molding process parameter selections. The study is carried out on 2 L bottle since they have the highest demand and the highest defect rate in the PET bottling sector. The PET bottles have been developed from the preform at various blowing temperature, blowing speed and blowing angle on commercially available SBM setup. The design and plan of experiments have been done according to L9 orthogonal array of Taguchi method. The optimization of process parameters has been done through the hybrid Taguchi grey relational analysis optimization technique on four factors namely: blowing temperature, first blow angle, second blow angle and blowing speed. Each value of parameter was taken at three levels in combination. The testing of all samples such as tensile test, wall thickness measurement and hoop stretch ratio measurement have been carried out as per ASTM standards. The morphology of the samples has been carried out through scanning electron microscope. A maximum tensile strength of 65 MPa, minimum hoop stretch ratio of 5.45 and a maximum wall thickness 0.24 mm was found at varying process parameter combinations. It has been observed that among the process parameters: blowing temperature was the most significant factor for minimizing defects while second blow angle was the least significant parameter. It was found that optimized values of the process parameters yielded 15% reduction in defects on PET bottles. The present study is expected to contribute significantly for the industries working in this field for carrying out production at optimum levels of process parameter

关键词： Plastic bottles

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Advanced high-entropy alloys breaking the property limits of current materials

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Journal of materials science & Technology 2024年第19期186卷 219-230页

作者： Dongyue Li Peter K.Liaw Lu Xie Yong Zhang Wenrui Wang School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA Beijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

The growing need for stronger and more ductile structural materials has spurred an intense search for innovative,high-performance ***,alloys face a pervasive trade-off:high strength often comes at the expense of ductility and vice *** advent of high-entropy alloys(HEAs)offering both high strength and ductility has transformed this *** this work,we discuss the deformation mechanisms of HEAs,examine the foundations of the strength-ductility trade-off,and explore approaches for designing HEAs to surmount this ***,we analyze the factors that govern HEA-deformation performance,which in turn influence the HEA *** also propose a perspective on future research directions concerning the mechanical behavior of HEAs,highlighting potential breakthroughs and novel strategies to advance the field.

关键词： High-entropy alloy Strength-ductility Trade-off Microstructure Deformation mechanism

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Thermodynamic analysis of metal segregation in dual phase high entropy ceramics

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Journal of Materiomics 2024年第4期10卷 889-895页

作者： Steven M.Smith II William G.Fahrenholtz Gregory E.Hilmas Stefano Curtarolo Missouri University of Science and Technology Materials Science and Engineering DepartmentRollaMO65409USA Duke University Department of Mechanical Engineering and Materials ScienceDurhamNC27708USA Duke University Center of Autonomous Materials DesignDurhamNC27708USA

Equilibrium Gibbs'free energy calculations were used to determine metal segregation trends between boride and carbide solid solutions containing two metals that are relevant to dual phase high entropy *** model predicted that Ti had the strongest tendency to segregate to the boride phase followed by Zr,Nb,Mo,V,Hf,and Ta,which matches experimental results of measured *** ratio of a metal in the carbide phase to the content of the same metal in the corresponding metal boride had a linear trend with the change in standard Gibbs'free energy of reaction for a metal carbide reacting with B_(4)C to produce its corresponding metal boride and *** proposed model was used to predict the changes in standard Gibbs'free energy for CrC→CrB_(2) to be−260 kJ and WC→WB_(2) to be 148 kJ,which indicates that Cr has the strongest segregation to the boride and W has the strongest segregation to the *** proposed model can be used to estimate the segregation of metals in dual phase high entropy boride-carbide ceramics of any boride/carbide ratio or metal content.

关键词： Dual phase High entropy ceramic Boride Carbide Thermodynamics

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Grey-box modelling for estimation of optimum cut point temperature of crude distillation column

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CAAI Transactions on Intelligence Technology 2025年第1期10卷 160-174页

作者： Junaid Shahzad Iftikhar Ahmad Muhammad Ahsan Farooq Ahmad Husnain Saghir Manabu Kano Hakan Caliskan Hiki Hong School of Chemical and Materials Engineering National University of Sciences and TechnologyIslamabadPakistan Department of Chemical and Materials Engineering College of EngineeringNorthern Border UniversityArarSaudi Arabia Department of Systems Science Kyoto UniversityKyotoJapan Department of Mechanical Engineering Faculty of Engineering and Natural SciencesUsak UniversityUsakTürkiye Department of Mechanical Engineering Kyung Hee UniversityYonginRepublic of Korea

A grey-box modelling framework was developed for the estimation of cut point temperature of a crude distillation unit(CDU)under uncertainty in crude composition and process *** principle(FP)model of CDU was developed for Pakistani crudes from Zamzama and Kunnar fields.A hybrid methodology based on the integration of Taguchi method and genetic algorithm(GA)was employed to estimate the optimal cut point temperature for various sets of process *** datasets were utilised to develop an artificial neural networks(ANN)model for the prediction of optimum values of cut *** ANN model was then used to replace the hybrid framework of the Taguchi method and the *** integration of the ANN and FP model makes it a grey-box(GB)*** the case of Zamama crude,the GB model helped in the decrease of up to 38.93%in energy required per kilo barrel of diesel and an 8.2%increase in diesel production compared to the stand-alone FP model under ***,for Kunnar crude,up to 18.87%decrease in energy required per kilo barrel of diesel and a 33.96%increase in diesel production was observed in comparison to the stand-alone FP model.

关键词： artificial neural networks crude distillation unit cut point temperature optimization exergy analysis gray box model industry 4.0

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Effect of Structural Configu ations on mechanical and Shape Recovery Properties of Ni Ti Triply Periodic Minimal Surface Porous Structures

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Chinese Journal of mechanical engineering 2024年第6期37卷 303-319页

作者： Shuaishuai Wei Bo Song Lei Zhang Xiaobo Wang Junxiang Fan Zhi Zhang Yusheng Shi State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Institute of Materials China Academy of Engineering PhysicsMianyang 621907China Department of Mechanical Engineering City University of Hong KongKowloon 999077China

Based on the advantages of triply periodic minimal surface(TPMS)porous structures,extensive research on NiTi shape memory alloy TPMS scaffolds has been ***,the current reports about TPMS porous structures highly rely on the implicit equation,which limited the design *** this work,novel shell-based TPMS structures were designed and fabricated by laser powder bed *** comparisons of manufacturability,mechanical properties,and shape recovery responses between traditional solid-based and novel shell-based TPMS structures were *** indicated that the shell-based TPMS porous structures possessed larger Young's moduli and higher compressive ***,Diamond shell structure possessed the highest Young's moduli of 605.8±24.5MPa,while Gyroid shell structure possessed the highest compressive strength of 43.90±3.32 *** addition,because of the larger specific surface area,higher critical stress to induce martensite transformation,and lower austenite finish temperature,the Diamond shell porous structure exhibited much higher shape recovery performance(only 0.1%residual strain left at pre-strains of 6%)than other porous *** results substantially uncover the effects of structural topology on the mechanical properties and shape recovery responses of NiTi shape memory alloy scaffolds,and confirm the effectiveness of this novel structural design *** research can provide guidance for the structural design application of NiTi porous scaffolds in bone implants.

关键词： NiTi shape memory alloy Porous structure Laser powder bed fusion mechanical property Shape recovery property

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Review of Recent Advancements in 3D Printing Technologies for Textile Applications

Textile and Leather Review

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Textile and Leather Review 2025年 8卷 72-104页

作者： Lemi, Muleta Tiki Lemu, Hirpa Gelgele Gutema, Endalkachew Mosisa Department of Mechanical and Structural Engineering and Materials Science Faculty of Science and Technology University of Stavanger StavangerN-4036 Norway Department of Mechanical Engineering College of Engineering &Technology Wollega University P.O. Box 395 Nekemte Ethiopia

3D printing (3DP) ranks as one of the more advanced methods in the manufacturing sector. All of the industrial sectors, including automobiles, medical services, aviation, athletics, fabrics, apparel, and fashion industries, have noticed an increase in the use of this approach for prototyping. In the past decade, 3DP technology has been applied in several industries by academics, textile technologists, designers of apparel, manufacturers, and suppliers. Textiles perform numerous purposes in addition to meeting the basic human need to protect the body. The textile industry has expanded its horizons with the incorporation of 3DP technology. This paper's goal is to present an integrated overview of the recent state of research to identify the most advanced 3DP techniques, materials, and applications currently used in the clothing and textile sectors. Fundamentals of basic textile substrates, numerous textile-related 3DP technologies, printing methods, materials for print inks, direct printing of 3D elements on different textile surfaces, and the impacts, benefits and limitations of 3D printed textile structure fabrication techniques are all addressed. It also emphasizes the ways 3DP technology will be used in the textile sector moving forward. Overall, the purpose of this issue of Textile Progress is to identify the potential of 3DP, which, despite certain limits, may improve the products of the fashion and textile sectors and encourage future scientists and designers to continue additional research. © 2025, idd3. All rights reserved.

关键词： Textile industry

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Spatially-graded 3D-printed viscoelastic truss metamaterials for impact trajectory control and energy absorption

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Theoretical & Applied Mechanics Letters 2024年第5期14卷 378-385页

作者： Kaoutar Radi Raphaël N.Glaesener Siddhant Kumar Dennis M.Kochmann Mechanics&Materials Lab Department of Mechanical and Process EngineeringETH Zürich 8092Switzerland Mechanics&Materials Computing Lab Department of Materials Science&EngineeringTU Delft 2628 CNNetherlands

This study demonstrates that two-and three-dimensional spatially graded,truss-based polymeric-material metamaterials can be designed for beneficial impact mitigation and energy absorption *** a combination of numerical and experimental techniques,we highlight the broad property space of periodic viscoelastic trusses,realized using 3D printing via selective laser *** beyond periodic designs,we investigate the impact response of spatially variant viscoelastic lattices in both two and three *** result reveal that introducing spatial variations in lattice topology allows for redirecting of the impact trajectory,opening new opportunities for engineering and tailoring lightweight materials with target impact *** is achieved through the combined selection of base material and metamaterial design.

关键词： Metamaterial 3D Printing Viscoelasticity Impact Truss Finite element method

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