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A novel magnetic flux-convergence semi-ellipsoidal eddy current probe for defect detection

IEEE Sensors Journal 2025年第11期25卷 19001-19013页

作者： Liu, Zenghua Li, Yuqing Ma, Wenbiao Tang, Zhenhe He, Cunfu Beijing University of Technology School of Information Science and Technology Beijing100124 China Beijing University of Technology College of Mechanical and Energy Engineering Beijing100124 China Bengbu University Anhui Bengbu233030 China Shandong Non-Metallic Material Institute Jinan250031 China

To enhance detection sensitivity and improve defect detection capabilities, existing probe improvements typically involve altering the coil's geometric structure or adding magnetic cores or shielding to pancake-shaped excitation coils. However, these approaches lack an overall optimization design of the probe structure. To address this gap, this study proposes a novel magnetic flux-convergence eddy current probe featuring a semi-ellipsoidal excitation coil, a super-permalloy core attached to the excitation coil, and a single detection coil. Initially, a finite element model (FEM) of the semi-ellipsoidal excitation coil was developed and compared with a pancake-shaped coil to verify its magnetic flux convergence effect. To further analyze the influence of different core tip structures on the probe's defect detection performance, cores with parabolic, wedge-shaped, and conical tip structures were fabricated. Subsequently, response surface methodology was employed to optimize the probe parameters, thereby yielding the most optimal geometric configuration for practical application. Finally, detection experiments were conducted on six artificial defects with varying depths and widths on an aluminum plate. The proposed probes demonstrated remarkable efficacy in identifying defects, thereby exemplifying exceptional detection performance. Among them, the probe with the conical tip core structure yielded the best results. These findings indicate that this novel probe exhibits considerable potential for utilization in defect detection applications. © 2025 IEEE.

关键词： Permalloy

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Mechanism of subsurface microstructural fatigue crack initiation during high and very-high cycle fatigue of advanced bainitic steels

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Journal of materials science & Technology 2022年第13期108卷 142-157页

作者： Guhui Gao Rong Liu Yusong Fan Guian Qian Xiaolu Gui R.D.K.Misra Bingzhe Bai Material Science&Engineering Research Center School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China State Key Laboratory of Nonlinear Mechanics(LNM) Institute of MechanicsChinese Academy of SciencesBeijing 100190China Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El Paso500W University AvenueEl PasoTX 79968USA Key Laboratory of Advanced Material School of Material Science and EngineeringTsinghua UniversityBeijing 100084China

Advanced bainitic steels with the multiphase structure of bainitic ferrite,retained austenite and martensite exhibit distinctive fatigue crack initiation behavior during high cycle fatigue/very high cycle fatigue(HCF/VHCF)*** subsurface microstructural fatigue crack initiation,referred to as“non-inclusion induced crack initiation,NIICI”,is a leading mode of failure of bainitic steels within the HCF/VHCF *** this regard,there is currently a missing gap in the knowledge with respect to the cyclic response of multiphase structure during VHCF failure and the underlying mechanisms of fatigue crack initiation during *** address this aspect,we have developed a novel approach that explicitly identifies the knowledge gap through an examination of subsurface crack initiation and interaction with the local *** was accomplished by uniquely combining electron microscopy,three-dimensional confocal microscopy,focused ion beam,and transmission Kikuchi ***,the study indicated that there are multiple micro-mechanisms responsible for the NIICI failure of bainitic steels,including two scenarios of transgranular-crack-assisted NIICI and two scenarios of intergranular-crack-assisted NIICI,which resulted in the different distribution of fine grains in the crack initiation *** fine grains were formed through fragmentation of bainitic ferrite lath caused by localized plastic deformation or via local continuous dynamic recrystallization because of repeated interaction between slip bands and prior austenite grain *** formation of fine grains assisted the advancement of small *** important aspect discussed is the role of retained austenite(RA)during cyclic loading,on crack initiation and propagation in terms of the morphology,distribution and stability of RA,which determined the development of localized cyclic plastic deformation in multiphase structure.

关键词： Microstructure Advanced bainitic steels Very high cycle fatigue Mechanism Retained austenite

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Experimental Investigation of Al8011 Reinforced with Zro2 Hybrid Metal Matrix Composite Based on Wear 1

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1st International Conference on Recent Advancements in materials science and Technology, ICRAMST 2024

作者： Brucely, Y. Saravanan, M.P. Rose, D. Deena Manivannan, S. Kannan, C. Ramesh Department of Mechanical Engineering SRM TRP Engineering College Tamil Nadu Irungalur India Department of Mechanical Engineering Saveetha Engineering College Tamil Nadu Chennai India Department of Artificial Intellegence K. Ramakrishnanan College of Technology Tamil Nadu Samayapuram Trichy India Center of Material Science Karpagam Academy of Higher Education Tamil Nadu Coimbatore India

ISBN: (数字)9783031699665

ISBN: (纸本)9783031699658

In today’s context, composite materials have become indispensable in various industries such as automobile, aerospace, and defense because of their exceptional strength, lightweight nature, and impressive mechanical properties. Aluminum alloy Al8011 is a versatile alloy known for its strength and excellent resistance to corrosion. This makes it a popular choice for demanding applications in industries such as automotive, marine, and aerospace. This study aims to analyze and compare the properties of Al8011 with the incorporation of zirconium oxide and graphite. Preparations were made for samples with varying weight percentages of zirconium oxide and graphite reinforcements using the stir casting method. The findings indicate that the integration of ZrO2 increases the mechanical properties, and graphite increases the material’s tensile strength. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Reinforcement

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Development of a novel quality control indicator for coffee roasting based on the digitalization of smell by a portable electronic nose 20

Development of a novel quality control indicator for coffee ...

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20th International Joint Conference on Computer science and Software engineering, JCSSE 2023

作者： Somaudon, Varanya Sakuldee, Pathapee Kerdcharoen, Teerakiat Materials Science and Engineering Program Mahidol University Faculty of Science Bangkok Thailand School of Science Material Engineering Mae Fah Luang University Chiang rai Thailand Mahidol University Faculty of Science Department of Physics Bangkok Thailand

ISBN: (纸本)9798350300505

Northern Thailand is home to several Arabica coffee-growing regions, including Mae-kampong, Teentok, Mae-lord, and Monngo Valleys, whose coffees are featured throughout this study. These coffees have distinct aromas and flavors due to their varied cultivation locations, which are influenced by unique climatic conditions. The purpose of this paper is to comprehend the aroma of coffees brought from various locations and roasted under the same conditions. Our lab-made electronic nose (e-nose) was used to digitalize and analyze the smell of coffee. In order to monitor the coffee scent throughout roasting and assess how similar the aromas of coffee samples taken from various locations are to one another, principal component analysis and hierarchical cluster analysis were used. It was found that our e-nose system is an effective tool for determining the geo-location of the coffee origin as well as for quality control of coffee production. © 2023 IEEE.

关键词： Electronic nose

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Polydopamine/polyethyleneimine co-crosslinked graphene oxide for the enhanced tribological performance of epoxy resin coatings

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Journal of materials science & Technology 2023年第5期136卷 13-20页

作者： Shaofeng Zhou Jin Yan Jialin Chen Huimin Yan Yin Zhang Jin Huang Guizhe Zhao Qiaoxin Zhang Yaqing Liu Shanxi Province Key Laboratory of Functional Nanocomposites and School of Materials Science and EngineeringNorth University of ChinaTaiyuan 030051China School of Mechanical and Electronic Engineering Wuhan University of TechnologyWuhan 430070China Queen Marry University of London Engineering School Northwestern Polytechnical UniversityXi’an 710129China Southwest Technology and Engineering Research Institute Chongqing 400039China School of Chemistry and Chemical Engineering and Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function ManufacturingSouthwest UniversityChongqing 400715China

To enhance the wear resistance of graphene oxide(GO)nano-filled epoxy resin(EP)coatings with ex-cellent dispersion,GO were modified using a co-crosslinking strategy between polydopamine(PDA)and polyethyleneimine(PEI)through an environmentally friendly,simple and low-cost ***-density amino-branched PEI and highly adhesive PDA formed covalent bond cross-links with GO(PDA/PEI-GO)through the Michael addition and Schiffbase *** the introduction of amino active sites,the PDA self-polymerization reaction time was significantly shorted from 24 to 6 *** covalently cross-linked network increased the lamellar spacing of GO and enhanced the interfacial bonds between the PDA/PEI-GO lamellae and EP *** to the improved dispersion and surface activity of GO,the PDA/PEI-GO nano-filled EP coating exhibited excellent wear *** friction with GCr15 stainless steel ball,the average friction coefficient and wear rate of the coating were reduced by 31.9%and 62.7%,respectively,compared to the pure EP *** addition,the wear mechanism of the PDA/PEI-GO/EP coating changed from adhesive and fatigue wear to abrasive wear,and it maintained good wear resistance by forming a GO lubrication transfer film on the counterpart ***,this study may provide a new strategy for improving the dispersion of graphene in wear-resistant polymer materials for practical applications.

关键词： Graphene oxide Co-crosslinking Epoxy coatings Tribological properties

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ANALYSIS OF BILINEAR OSCILLATORS USING GENERALIZED ASSOCIATED LINEAR EQUATIONS AND NONLINEAR OUTPUT FREQUENCY RESPONSE FUNCTIONS 30

ANALYSIS OF BILINEAR OSCILLATORS USING GENERALIZED ASSOCIATE...

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30th International Congress on Sound and Vibration, ICSV 2024

作者： Zhang, Wenbo Zhang, Bo Guo, Xiaoyue Zhang, Yunhe Zhu, Yunpeng School of Mechanical Engineering Ningxia University Yinchuan750021 China School of Mathematics and Statistics Central South University Changsha410083 China School of Engineering and Material Science Queen Mary University of London London United Kingdom

ISBN: (纸本)9789090390581

Nonlinear Output Frequency Response Functions (NOFRFs), which are a one-dimensional extension of the linear Frequency Response Function (FRF) to nonlinear cases, have been introduced for nonlinear system analysis and structural damage detection. The evaluation of NOFRFs is accomplished by solving a series of linear difference or differential equations, known as Generalized Associated Linear Equations (GALEs). In the present study, Coupled Computational Method (CCM) is proposed for the numerical calculation of the Nonlinear Differential Equation Model based on GALEs theory. It is found out that this method can improve calculation accuracy of nonlinear output response and would be a new alternative for calculating NOFRFs. Meanwhile, according to the Weierstrass Approximation Theorem, the equivalent polynomial approximation model of the Bilinear Oscillator is firstly investigated. And then, based on the Nonlinear Differential Equation model and GALEs theory, the NOFRFs of the polynomial approximation model of the Bilinear Oscillator excited by single harmonic input are calculated, and the effectiveness of the GALEs theory’s CCM calculation of NOFRFs is analyzed by comparing with the analytical results of the NOFRFs of the polynomial approximation model. © 2024 Proceedings of the International Congress on Sound and Vibration. All rights reserved.

关键词： Polynomial approximation

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MXene:From synthesis to environment remediation

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Chinese Journal of Chemical engineering 2023年第9期61卷 260-280页

作者： Ali Nikkhah Hasan Nikkhah Hadis langari Alireza Nouri Abdul Wahab Mohammad Ang Wei Lun Ng law Yong Rosiah Rohani Ebrahim Mahmoudi Department of Chemical and Process Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangi 43600Malaysia Department of Mechanical and Aerospace Engineering University at BuffaloBuffaloUSA Department of Chemical and Biomolecular Engineering University of ConnecticutStorrsUSA Department of Chemistry and Medicinal Chemistry University at BuffaloBuffaloUSA Chemical and Water Desalination Engineering Program College of EngineeringUniversity of SharjahSharjah 27272United Arab Emirates Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul RahmanJalan Sungai LongBandar Sungai LongKajangSelangorMalaysia

A new burgeoning family of two-dimensional(2D)transition metal carbides/nitrides,better known as MXenes,have received extensive attention because of their distinct properties,such as metallic conductivity,good hydrophilicity,large surface area,good mechanical stability,and *** 40 different MXenes have been synthesized,and dozens more structures and properties have been theoretically ***,the recent progress in MXenes development is not well covered in chronological order based on different *** review article focuses on emerging synthesis methods,the properties of MXenes,and mainly the applications of MXenes and MXene-based material family in environmental remediation,a comprehensive review of gaseous and aqueous pollutants treatment.

关键词： MXene 2D materials Wastewater treatment CO_(2)capture Adsorption Photodegradation

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Improvement of corrosion resistance and heat dissipation of Mg-6%Al-4%Ca alloy by the addition of Mn, Mm, and the surface treatment

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Keikinzoku/Journal of Japan Institute of Light Metals 2023年第12期73卷 646-650页

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

With the recent digitization, electronic equipment housings are required to be thin-walled and have rigidity, heat dissipation, corrosion resistance, and electromagnetic shielding properties. Magnesium alloys are promising materials that satisfy these requirements. Mg-Al alloys have good castability and high strength, but their thermal conductivity decreases. In general, adding alloying elements to magnesium decreases thermal conductivity the effect of aluminum addition is significant. It was found that adding calcium to Mg-Al alloys to form Mg-Al-Ca (AX) alloys results in higher thermal conductivity than that of Mg-Al alloys. However, AX alloys have poor corrosion resistance and require post-treatment such as surface treatment. In this study, AX64, which has high thermal conductivity among the AX series alloys, was used as the basic composition, and corrosion resistance was improved by adding manganese and misch metal, and an attempt was made to improve corrosion resistance and emissivity through surface treatment. The change in thermal conductivity by heat treatment was also investigated. Experimental results showed that the addition of manganese and misch metal improved corrosion resistance and thermal conductivity. Plasma anodization also improved corrosion resistance and emissivity. Heat treatment of these alloys at 400°C improved the thermal conductivity with longer holding time. © 2023 The Japan Institute of Light Metals.

关键词： Corrosion resistance

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Unlocking of Schottky Barrier Near the Junction of MoS_(2)Heterostructure Under Electrochemical Potential

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Energy & Environmental materials 2025年第1期8卷 323-329页

作者： Kubra Aydin Mansu Kim Hyunho Seok Chulwoo Bae Jinhyoung Lee Muyoung Kim Jonghwan Park Joseph T.Hupp Dongmok Whang Hyeong-U Kim Taesung Kim SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan UniversitySuwon 16419Korea Department of Nano Science and Technology Sungkyunkwan UniversitySuwon 16419Korea Department of Chemistry Northwestern UniversityEvanstonIllinois 60208USA School of Advanced Material Science and Engineering Sungkyunkwan UniversitySuwon 16419Korea Semiconductor Manufacturing Research Center Korea Institute of Machinery and Materials(KIMM)Daejeon 34103Korea School of Mechanical Engineering Sungkyunkwan UniversitySuwon 16419Korea Center for Quantum Nanoscience Institute for Basic Science(IBS)Seoul 03760Korea 不详 Nano-Mechatronics University of Science&Technology(UST)Daejeon 34113Korea Department of Nano Engineering Sungkyunkwan UniversitySuwon 16419Korea

The exploration of heterostructures composed of two-dimensional(2D)transition metal dichalcogenide(TMDc)materials has garnered significant research attention due to the distinctive properties of each individual component and their phase-dependent unique *** the plasma-enhanced chemical vapor deposition(PECVD)method,we analyze the fabrication of heterostructures consisting of two phases of molybdenum disulfide(MoS_(2))in four different *** initial hydrogen evolution reaction(HER)polarization curve indicates that the activity of the heterostructure MoS_(2)is consistent with that of the underlying MoS_(2),rather than the surface activity of the upper MoS_(2).This behavior can be attributed to the presence of Schottky barriers,which include contact resistance,which significantly hampers the efficient charge transfer at junctions between the two different phases of MoS_(2)layers and is mediated by van der Waals ***,the energy barrier at the junction dissipates upon reaching a certain electrochemical potential,indicating surface activation from the top phase of MoS_(2)in the ***,the 1T/2H MoS_(2)heterostructure demonstrates enhanced electrochemical stability compared to its metastable 1T-MoS_(2).This fundamental understanding paves the way for the creation of phase-controllable heterostructures through an experimentally viable PECVD,offering significant promise for a wide range of applications.

关键词： hydrogen evolution reaction(HER) molybdenum disulfide(MoS_(2)) plasmaenhanced chemical vapor deposition(PECVD) Schottky barrier van der Waals(vdW)heterostructure

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3D Printed Biomimetic Metamaterials with Graded Porosity and Tapering Topology for Improved Cell Seeding and Bone Regeneration

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Bioactive materials 2023年第7期25卷 677-688页

作者： Lei Zhang Bingjin Wang Bo Song Yonggang Yao Seung-Kyum Choi Cao Yang Yusheng Shi State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Department of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA30332USA

Biomimetic metallic biomaterials prepared for bone scaffolds have drawn more and more attention in recent ***,the topological design of scaffolds is critical to cater to multi-physical requirements for efficient cell seeding and bone regeneration,yet remains a big scientific challenge owing to the coupling of mechanical and mass-transport properties in conventional scaffolds that lead to poor control towards favorable modulus and permeability ***,inspired by the microstructure of natural sea urchin spines,biomimetic scaffolds constructed by pentamode metamaterials(PMs)with hierarchical structural tunability were additively manufactured via selective laser *** mechanical and mass-transport properties of scaffolds could be simultaneously tuned by the graded porosity(B/T ratio)and the tapering level(D/d ratio).Compared with traditional metallic biomaterials,our biomimetic PM scaffolds possess graded pore distribution,suitable strength,and significant improvements to cell seeding efficiency,permeability,and impact-tolerant capacity,and they also promote in vivo osteogenesis,indicating promising application for cell proliferation and bone regeneration using a structural innovation.

关键词： Biomimetic biomaterials Pentamode metamaterials Selective laser melting Mass-transport properties Bone scaffolds

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