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Removing Bridge Coatings Using Lasers and Electric Fields

materials Performance 2024年第2期63卷 42-45页

作者： Moffat, W. Fitz-Gerald, J. Agnew, S. Sharp, S. Provines, J. Department of Material Science and Engineering The University of Virginia CharlottesvilleVA United States Virginia Department of Transportation CharlottesvilleVA United States

Bridge coatings, which are routinely applied to large infrastructure, must protect the underlying structural steel from moisture and aggressive ions to ensure long-term corrosion protection, as well as to lower the costs associated with bridge coating repair and maintenance work. However, despite the many advances in bridge coating performance, coatings still have limited effective lifetimes and must be removed, and the steel underneath carefully prepared for the new coating application. The most common, industry standard method of coating removal and surface preparation is abrasive blasting, which is known to effectively clean and profile steel surfaces for coating adhesion. © 2024 NACE International. All rights reserved.

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Mechanical response and microstructural evolution of a composite joint fabricated by green laser dissimilar welding of VCoNi medium entropy alloy and 17-4PH stainless steel

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材料科学技术（英文版） 2025年第10期213卷 223-240页

作者： Hadiseh Esmaeilpoor Mahdi Aghaahmadi Hyun Jong Yoo Chan Woong Park Tae Jin Jang Seok Su Sohn Jeoung Han Kim Department of Materials Science & Engineering Hanbat National University125 Dongseo-daeroYuseong-gu34158 DaejeonRepublic of Korea Department of Materials Science & Engineering Hanbat National University125 Dongseo-daeroYuseong-gu34158 DaejeonRepublic of Korea Secondary Battery Material Convergence Team Jeonbuk TechnoparkBongdong-eup55315 Jeollabuk-doRepublic of Korea Department of Materials Science and Engineering Korea UniversitySeoulRepublic of Korea

In engineering structures,the application of advanced alloys,such as the VCoNi medium-entropy alloy(VCoNi-MEA),with remarkable tensile strength(＞1 GPa)and superior ductility necessitates the employ-ment of dissimilar *** study pioneers the dissimilar joining of VCoNi-MEA and 17-4 precipitation hardening stainless steel(17-4PH STS)using state-of-the-art green laser beam welding(LBW).To eval-uate and optimize the experimental parameters,two welding speeds(200 and 300 mm/s)along with post-weld heat treatment(PWHT)were ***-quality welded joints with a single-phase face-centered cubic(FCC)structure in the fusion zone(FZ),minimal precipitates(＜1.6％),and no visible cracks were successfully *** LBW process demonstrated effective low-heat input characteristics,evident from a considerably narrow heat-affected zone(HAZ).Control over FZ width and grain size was achieved,measuring 600 and 112 μm at low welding speed and 250 and 49 pm at high welding speed,respectively,significantly lower than previous studies.A remarkably high yield strength(YS)of～620 MPa and ultimate tensile strength(UTS)up to 845 MPa were observed in the as-welded conditions,improving to～645 and 875 MPa,respectively,after *** enhancement in mechanical properties is primarily attributed to lattice friction induced by V *** also improved joint ductility,increasing from 3.5％to 8.6％(low-speed)and from 6.3％to 9.2％(high-speed).The reduction in crystallographic orienta-tion achieved using a higher welding speed and PWHT emerged as a major reason for improved mechan-ical ***-based deformation mechanisms dominated across all conditions,featuring crystallo-graphically aligned slip *** between existing and additional slip bands formed a dense dislocation network crucial for enhanced elongation after *** parameters elucidating phase stability in the observed FZs and contributions to superior YS were calculated and comprehensively discu

关键词： Medium-entropy alloys Precipitation hardening stainless steel Dissimilar laser beam welding Green laser Mechanical properties Post-weld heat treatment

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Micro-scaled plastic yielding and shear-banding dynamics in metallic glasses

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Journal of materials science & Technology 2023年第21期152卷 237-246页

作者： D.X.Han G.Wang Q.Wang R.Feng X.D.Ma K.C.Chan C.T.Liu Institute of Materials Shanghai UniversityShanghai 200444China Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHong KongChina Neutron Scattering Division Oak Ridge National LaboratoryOak RidgeTN 37831United States Department of Material Science and Engineering College of Science and EngineeringCity University of Hong KongHong KongChina Center for Advanced Structural Materials College of Science and EngineeringCity University of Hong KongHong KongChina

Shear-banding behavior in metallic glasses plays a key role in the operation of plastic deformation,which is associated with yield *** a micro-scale,the shear-banding behavior must be affected by many factors from the test machine and the ***,in this study,comprehensively considering a machine compliance,a geometry imperfection of micro-pillar,and a substrate sink-in the machine-sample-substrate system,we developed a plastic-strength model at a micrometer scale in this study,which is evidenced by the microscale compressive properties of 18 kinds of metallic *** the-oretical model provides a guidance for the elastic limits and shear-banding dynamics of metallic glasses at the micro-scale,which can be applicable to characterize the microscale deformation behavior of other amorphous materials.

关键词： Metallic glasses Shear-banding dynamics Micro-compression Plastic deformation

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Ultrafast high-temperature sintering of high-entropy oxides with refined microstructure and superior lithium-ion storage performance

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Journal of Advanced Ceramics 2023年第10期12卷 1857-1871页

作者： Yuhang Bai Jinrui Li Hai Lu Jia Liu Cuiying Ma Bin Wang Xing Zhao Jun Deng School of Material Science and Engineering Xi’an University of Science and TechnologyXi’an 710054China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China School of Safety Science and Engineering Xi’an University of Science and TechnologyXi’an 710054China

High-entropy oxides(HEOs)have received significant attention because of their tunable mechanical properties and wide range of functional ***,the conventional method used for sintering HEOs requires prolonged processing time,which results in excessive grain growth,thereby compromising their ***,an ultrafast high-temperature sintering(UHS)strategy was adopted,and rock-salt composite(Mg_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2)Zn_(0.2))O was selected as model *** parameters were tuned to illustrate the influence of applied current and soaking time on the densification process and resulting grain ***,the electrochemical performance of UHS-synthesized microparticles as anode materials in lithium-ion batteries was *** results show that the ultrafast heating rate results in fine grains with a diameter of~6–8μm and density of 95%,which are much smaller and similar to those obtained using the conventional sintering method(25μm and 96%).Moreover,the high surface area and reactivity of the microparticles,as well as their sluggish diffusion effect and structural stability,contribute to outstanding performance with high capacity(336 mA·h/g at 1 A/g)and ultralong cyclability(1000 cycles).This novel technique offers valuable insights into the densification process of HEOs and other materials and can thus broaden their application range.

关键词： ultrafast high-temperature sintering(UHS) high-entropy oxide(HEO) microstructure Li-ion battery anode materials

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The Effects of an Extended Sensitivity Analysis of Sensor Configurations for Bridge Damage Detection Using Experimental Data 41st

The Effects of an Extended Sensitivity Analysis of Sensor Co...

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41st IMAC, A Conference and Exposition on structural Dynamics, 2023

作者： del Pozo, Gabriel A. Svendsen, Bjørn T. Øiseth, Ole Department of Structural Engineering Norwegian University of Science and Technology Trondheim Norway

ISBN: (纸本)9783031366628

The damage detection capabilities of sensor setups are essential for any structural health monitoring (SHM) system. In this chapter, the performance of different subsets of sensor configurations selected from a set of 40 accelerometers is evaluated using metrics such as misclassification rate, false positive (FP), and false negative (FN) indications of damage. The subsets of sensor configurations are based on experimental data from a benchmark study that involved capturing the dynamic behavior of a full-scale steel bridge in undamaged and damaged conditions of the bridge. Several iterations with new subsets of decreasing size are generated by the elimination of random sensors. These subsets are then tested using Mahalanobis squared distance (MSD) as the novelty detection algorithm. Additionally, a manual selection of subsets is evaluated, where the sensors located farthest from the damages are eliminated. The results highlight the advantages of a dense sensor network and indicate a complex mechanism behind the damage detection capabilities of sensor networks with a clear trend of inverse proportionality between the sensor set size and FN indications of damage. © 2024, The Society for Experimental Mechanics, Inc.

关键词： structural health monitoring

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Study on the Effect of Nanoparticles Extracted from Banyan Aerial Root Reinforced Porcelain Filler Blended PMMA Composite

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Journal of The Institution of Engineers (India): Series D 2024年 1-6页

作者： Raja, Thandavamoorthy Devarajan, Yuvarajan Material Science Lab Department of Prosthodontics Saveetha Dental College and Hospitals SIMATS Saveetha University Chennai India Department of Mechanical Engineering Saveetha School of Engineering SIMATS Saveetha University Chennai India

This study investigates the properties of a novel composite material designed for dental applications, consisting of nanoparticles extracted from banyan aerial roots, reinforced with porcelain filler, and blended into a polymethyl methacrylate (PMMA) matrix. The primary focus is on evaluating the antimicrobial efficacy and analyzing the functional characteristics of the composite. Antibacterial testing against common oral pathogens demonstrates significant microbial growth inhibition, highlighting the composite’s potential in preventing oral infections. X-ray Diffraction analysis reveals the crystalline nature of the composite, with distinct peaks confirming the presence of PMMA, banyan root nanoparticles, and porcelain filler. The sharp peak 2θ at around 29.2° with 2987 intensity is characteristic of the PMMA matrix, showcasing its semi-crystalline structure. Scanning Electron Microscopy examination shows a uniform dispersion of nanoparticles and a smooth surface morphology, indicative of effective material integration and potential for favorable mechanical properties. Energy Dispersive X-ray analysis complements SEM by identifying the elemental composition of 1.25% (Si) and 1.09% (Mg) verifying the inclusion of all components. The findings of this study suggest that the banyan root nanoparticle-reinforced porcelain filler blended with PMMA composite possesses promising antimicrobial properties, along with desirable physical and chemical characteristics can be used for medical instruments. © The Institution of Engineers (India) 2024.

关键词： Nanoparticles

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Amorphous silica fiber matrix biomaterials:An analysis of material synthesis and characterization for tissue engineering

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Bioactive materials 2023年第1期19卷 155-166页

作者： Hyun S.Kim Sangamesh G.Kumbar Syam P.Nukavarapu Department of Biomedical Engineering University of ConnecticutStorrsCTUSA Department of Material Science and Engineering University of ConnecticutStorrsCTUSA Department of Orthopaedic Surgery University of Connecticut HealthFarmingtonCTUSA

Silica biomaterials including Bioglass offer great biocompatibility and bioactivity but fail to provide pore and degradation features needed for tissue *** we report on the synthesis and characterization of novel amorphous silica fiber matrices to overcome these *** silica fibers were fused by sintering to produce porous *** effects of sacrificial polymer additives such as polyvinyl alcohol(PVA)and cellulose fibers(CF)on the sintering process were also *** resulting matrices formed between sintering temperatures of 1,350-1,550◦C retained their fiber *** matrices presented pores in the range of 50-200μm while higher sintering temperatures resulted in increased pore *** addition to silica significantly reduced the pore diameter and porosity compared with silica matrices with or without the addition of *** PVA additive morphologically appeared to fuse the silica fibers to a greater extent and resulted in significantly higher compressive modulus and strength than the rest of the matrices *** matrices lost roughly 30%of their original mass in an in vitro degradation study over 40 *** matrices absorbed 500 wt%of water and did not change in their overall morphology,size,or shape with *** fiber matrices supported human mesenchymal stem cell adhesion,proliferation,and mineralized matrix *** silica fiber biomaterials/matrices reported here are biodegradable and porous and closely resemble the native extracellular matrix structure and water absorption *** the methodology reported here to alter matrix properties may lead to a variety of tissue engineering,implant,and drug delivery applications.

关键词： Silica biomaterial Porous matrix ECM-Like fibrous structure Biodegradable Water absorption

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Deformation and Crack Monitoring of RC Beams Based on Computer Vision 29th

Deformation and Crack Monitoring of RC Beams Based on Comput...

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29th International Conference on Computational and Experimental engineering and sciences, ICCES 2023

作者： Wang, Ruilin Zhang, Weiping Zhang, Shuting Yu, Youling Department of Structural Engineering Tongji University Shanghai China Department of Control Science and Engineering Tongji University Shanghai China

ISBN: (纸本)9783031429866

Deformation and cracks are valuable clues for evaluating the condition of existing concrete structures. In previous studies, computer vision technology has been proven to be an efficient and accurate means for detailed deformation and crack information acquisition. But there is still a gap in determining the functional level of structures directly from the extracted information. In this study, six concrete beams with different reinforcements were loaded to failure, and the loading processes were recorded by cameras. The dynamic evolution of deformation and cracks under different load steps was analyzed by our designed image processing pipeline. It was found deformation and crack evolution were strongly related to failure mode. On this basis, a crack characteristic parameter system used for structure monitoring was established, which is composed of the initial position, width, length, direction, and occurrence time of the fracture, corresponding characterization and extraction methods also were proposed. The established parameter system can be used to solve reverse problems such as failure mode pre-diction and load estimating. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Computer vision

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Tailored heterogeneous interface based on porous hollow In-Co-C nanorods to construct adjustable multi-band microwave absorber

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Journal of materials science & Technology 2024年第14期181卷 128-137页

作者： Zhengying Shen Di Lan Yi Cong Yuanyuan Lian Nannan Wu Zirui Jia School of Material Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Department of Otolaryngology the Affiliated Hospital of Qingdao UniversityQingdao 266000China School of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China

By rationally controlling the growth of zeolite-imidazolium salt skeleton(ZIF-67)nanoparticles on the hollow indium oxide(In_(2)O_(3))and the subsequent pyrolysis process,In-Co-C hollow rod-like composites with multiple components were successfully prepared in this *** synergistic impact of diverse components including In_(2)O_(3),C,Co_(3)InC_(0.75),and In not only optimizes impedance matching and improves conductive loss,but also creates significant interfacial ***,the addition of Co source and pyrolysis temperature was found to have a significant affected on impedance matching and mi-crowave *** optimized In-Co-C sample displayed ultra-broad absorption bandwidth(EAB)of up to 7.12 GHz(10.88–18.0 GHz)at 2.26 mm thickness,which could cover the whole Ku band and part of X-band,outperforming the previously reported MOFs-derived ***,by adjusting the thickness to 2.91 mm and 4.01 mm,the EAB could cover the entire X band and most of the C *** attenuation mechanisms were systematically investigated through the delta function method and ANSYS high-frequency structure *** findings suggest that the MOFs-derived In-Co-C hollow nanorods could serve as high-performance microwave absorbers with ultra-broad absorption.

关键词： Microwave absorption Hollow rod-like MOFs-derived Conductive loss Interfacial polarization Impedance matching

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Aluminium nodes for timber gridshells: Parametric detailing of node principles

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International Journal of Space Structures 2023年第4期38卷 217-232页

作者： Dyvik, Steinar Hillersøy Haakonsen, Sverre Magnus Luczkowski, Marcin Komiyama, Yosuke Department of Architecture and Technology Norwegian University of Science and Technology Trondheim Norway Department of Structural Engineering Norwegian University of Science and Technology Trondheim Norway Department of Architecture and Architectural Engineering Kyoto University Kyoto Japan

Gridshell nodes are key elements regarding structural performance, visual appearance and assembly of any gridshell that have been given little attention in recent research. This paper explores aluminium as a material for timber gridshell nodes. First, existing gridshell nodes are categorised regarding bulk materials, gripper types and connection methods and based on this, a set of novel node principles in aluminium are deducted and proposed for a timber gridshell on the geometry of the British Museum Great Court. A finite element analysis is done on the proposals to increase the understanding of the node principles’ structural behaviour and feasibility. Together, the set of node principles, their evaluation and the utilised procedure can provide new options in the future design of gridshells and gridshell nodes. © The Author(s) 2023.

关键词： Timber

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