检索结果-内蒙古大学图书馆

Monitoring defects in plates using topological acoustic sensing and sideband peak counting

Ultrasonics 2025年 149卷 107568页

作者： Ho, I-Ting Muralidharan, Krishna Runge, Keith Hernandez Granados, Araceli Kundu, Tribikram Deymier, Pierre A. New Frontiers of Sound Science and Technology Center University of Arizona TucsonAZ85721 United States Department of Materials Science and Engineering University of Arizona TucsonAZ85721 United States Department of Civil and Architectural Engineering and Mechanics University of Arizona TucsonAZ85721 United States Department of Aerospace and Mechanical Engineering University of Arizona TucsonAZ85721 United States

We demonstrate an integrated non-destructive inspection methodology that employs the nonlinear ultrasonics-based sideband peak counting (SPC) technique in conjunction with topological acoustics (TA) sensing to comprehensively characterize the acoustic response of steel plates that contain differing levels of damage. By combining the SPC technique and TA, increased sensitivity to defect/damage detection as well as the ability to spatially resolve the presence of defects was successfully established. Towards this end, using a Rockwell hardness indenter, steel plates were subject to one, three and five centrally located indentations respectively. The acoustic response of the plate as a function of number of indentations was examined at a frequency range between 50 kHz and 800 kHz, from which the change in a global geometric phase was evaluated. Here, geometric phase is a measure of the topological acoustic field response to the spatial locations of the indentations within the steel plates. The global geometric phase unambiguously showed an increase with increasing number of indentations. In addition, spatial variations in a ‘local’ geometric phase as well as spatial variations in the SPC-index (SPC-I) were also determined. Spatial variations in both the local geometric phase as well as the SPC-I were particularly significant across the indentations for frequencies below 300 kHz, and by combining the respective spatial variations in the SPC-I and geometric phase, the locations of the indentations were accurately identified. The developed SPC-TA nondestructive method represents a promising technique for detecting and evaluating defects in structural materials. © 2025 Elsevier B.V.

关键词： Structural health monitoring

来源：评论

学校读者我要写书评

暂无评论

Towards Quantitative Interpretation of 3D Atomic Force Microscopy at Solid-Liquid Interfaces

arXiv

引用

arXiv 2025年

作者： Ai, Qian Bonagiri, Lalith Krishna Samanth Payam, Amir Farokh Aluru, Narayana R. Zhang, Yingjie Department of Materials Science and Engineering University of Illinois UrbanaIL61801 United States Materials Research Laboratory University of Illinois UrbanaIL61801 United States Department of Mechanical Science and Engineering University of Illinois UrbanaIL61801 United States School of Engineering Ulster University BelfastBT15 1AP United Kingdom Walker Department of Mechanical Engineering Oden Institute for Computational Engineering & Sciences The University of Texas at Austin AustinTX78712 United States Beckman Institute for Advanced Science and Technology University of Illinois UrbanaIL61801 United States

Three-dimensional atomic force microscopy (3D-AFM) has been a powerful tool to probe the atomic-scale structure of solid-liquid interfaces. As a nanoprobe moves along the 3D volume of interfacial liquid, the probe-sample interaction force is sensed and mapped, providing information on not only the solid morphology, but also the liquid density distribution. To date 3D-AFM force maps of a diverse set of solid-liquid interfaces have been recorded, revealing remarkable force oscillations that are typically attributed to solvation layers or electrical double layers. However, despite the high resolution down to sub-angstrom level, quantitative interpretation of the 3D force maps has been an outstanding challenge. Here we will review the technical details of 3D-AFM and the existing approaches for quantitative data interpretation. Based on evidences in recent literature, we conclude that the perturbation-induced AFM force paradoxically represents the intrinsic, unperturbed liquid density profile. We will further discuss how the oscillatory force profiles can be attributed to the probe-modulation of the liquid configurational entropy, and how the quantitative, atomic-scale liquid density distribution can be derived from the force maps. Copyright © 2025, The Authors. All rights reserved.

关键词： Probes

来源：评论

学校读者我要写书评

暂无评论

Synergistic sodium alginate- and biochar-immobilized cells for enhancing fermentative hydrogen production from food waste

引用

Environmental science and Pollution Research 2024年第56期31卷 64524-64533页

作者： Ngamnurak, Phonsini Plangklang, Pensri Pomdaeng, Prakaidao Ko, Ting-Wu Reungsang, Alissara Chu, Chen-Yeon Graduate School Khon Kaen University Khon Kaen40002 Thailand Department of Biology Technology Faculty of Technology Khon Kaen University Khon Kaen40002 Thailand Research Group for Development of Microbial Hydrogen Production Process From Biomass Khon Kaen University Khon Kaen40002 Thailand Institute of Green Products Feng Chia University Taichung Taiwan Ph.D. Program of Mechanical and Aeronautical Engineering Feng Chia University Taichung Taiwan Master’s Program of Green Energy Science and Technology Feng Chia University Taichung Taiwan Academy of Science Royal Society of Thailand Bangkok10300 Thailand

An immobilized hydrogen-producing consortium investigated biohydrogen production from food waste using a combination of sodium alginate and cassava rhizome biochar. We investigated the effect of varying the biochar concentration from 0 to 3% and the size of immobilized cells from 1 to 7 mm. Immobilized cells were prepared using 50% (v/v) enriched hydrogen-producing consortium, 2% (w/v) sodium alginate, and 0 to 3% (w/v) cassava rhizome biochar. The optimal conditions for achieving the highest hydrogen production in the batch fermentation reactor were identified as a biochar concentration of 2% (w/v) and an immobilized cell size of 2 mm. The highest hydrogen yield, maximum hydrogen production rate, and lag time recorded were 0.69 mmol H2/g-COD, 0.02 mmol H2/g-COD.h, and 41.51 h, respectively. This research highlights the potential of cassava biochar technology for efficient biohydrogen production from food waste, contributing to renewable energy generation and sustainable waste management. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Anaerobic digestion

来源：评论

学校读者我要写书评

暂无评论

Deformation mechanisms in aβ-quenched Ti-5321 alloy:In-situ investigation related to slip activity,orientation evolution and stress induced martensite

引用

Journal of materials science & Technology 2022年第17期112卷 36-48页

作者： Cong Wu Qinyang Zhao Shixing Huang Yongqing Zhao Lei Lei Junqiang Ren Qiaoyan Sun Lian Zhou State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi’an 710049China School of Material Science and Engineering Chang'an UniversityXi’an 710064China Northwest Institute for Non-ferrous Metal Research Xi’an 710016China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China

The deformation behavior ofβ-quenched nearβTi-5321(Ti-5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe)alloy was systematically studied using in-situ tensile test monitored by the scanning electron microscopy(SEM).Besides,the electron backscatter diffraction(EBSD)was performed to thoroughly discuss the deformation *** results indicated that slip activities,crystal rotation and stress induced martensite transformation were the major deformation mechanisms in theβ-quenched Ti-5321 alloy during in-situ tensile *** slip activities were investigated by using the EBSD-trace analysis,which demonstrated that{110}<111>,{112}<111>and{123}<111>slip systems were activated and the{110}<111>slip system ***,βgrains rotated about 7.8°to accommodate the increased ***,the stress induced martensiteα″which was related to the double yielding behavior during tensile process exhibited multiple *** differentα″variants divided theβmatrix into smallerβblocks with a typical zigzag morphology,in which oneα″variant passed through another one by deflecting its initial growth ***,the deformation twinning in martensiteα″and slip bands cutting through martensiteα″effectively accommodated the local *** systematically analysis can provide insightful information about the deformation mechanisms in nearβtitanium alloys.

关键词： In-situ tensile test Slip activity Stress induced martensite Titanium alloys

来源：评论

学校读者我要写书评

暂无评论

Microstructures and mechanical Properties of Mg–xAl–1Sn–0.3Mn(x=1,3,5)Alloy Sheets

引用

Acta Metallurgica Sinica(English Letters) 2020年第9期33卷 1217-1225页

作者： Chao-Yue Zhao Xian-Hua Chen Peng Peng Teng Tu Andrej Atrens Fu-Sheng Pan College of Materials Science and Engineering Chongqing UniversityChongqing 400045China Shenyang National Laboratory for Materials Science Chongqing UniversityChongqing 400045China School of Mechanical and Mining Engineering The University of QueenslandSt LuciaQLD 4072Australia

The influence of Al alloying on the microstructures and the mechanical properties of Mg–x Al–1 Sn–0.3 Mn alloy sheets was investigated. The microstructure of Mg– x Al–1 Sn–0.3 Mn consisted of α-Mg and Mg 17 Al 12 precipitates. Alloying with Al increased the amount of Mg17Al12 and the average grain size. Uniaxial tensile tests were carried out along the extrusion direction(ED), the transverse direction(TD) and 45° toward the ED. Mg–5 Al–1 Sn–0.3 Mn alloy sheet exhibited the best combination of mechanical properties along the ED: a yield strength of 142 MPa, an ultimate tensile strength of 282 MPa and an elongation of 23%. The good performance of Mg–5 Al–1 Sn–0.3 Mn sheet was mainly attributed to the large quantity of Mg17Al12 precipitates and a weak basal texture. Annealing caused static dynamic recrystallization, refined the grain size and enhanced the mechanical properties: yield strength of 186 MPa, ultimate tensile strength of 304 MPa, elongation of 21% along ED. Both strength and ductility were enhanced by Al alloying.

关键词： Mg–xAl–1Sn–0.3Mn alloys Extrusion Microstructure mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Effect of Sodium Dodecyl Sulfate and Hydrogen Peroxide on the Microstructure Evolution of Fiber-Reinforced Lightweight Geopolymer Composite

SSRN

引用

SSRN 2024年

作者： Alves, Cleidson Rosa Muller, Anderson Augusto Dal-Bó, Alexandre Gonçalves Bernandin, Adriano Michael Civil Engineering Department Federal Institute of Santa Catarina Santa Catarina Criciúma Brazil Graduate Program in Materials Science and Engineering University of the Extreme South of Santa Catarina Santa Catarina Criciúma Brazil Ceramic Materials Group United States

Lightweight geopolymers have the potential for innovative applications, such as low thermal conductivity material, pH regulator, adsorbent material, and lightweight concrete. However, these materials are often fragile due to their high porosity. In this study, the combined effect of sodium dodecyl sulfate (SDS) with hydrogen peroxide (H2O2) in the pore formation of a geopolymeric mortar reinforced with glass fiber and polypropylene fibers was investigated. The aim was to improve the distribution and morphology of pores, resulting in lower thermal conductivity. Lightweight mortars were produced using metakaolin, alkaline activators, and standardized sand. The innovation in this study lies in the incorporation of fibers as reinforcement in lightweight geopolymers and the microstructural changes resulting from the combination of the pore-forming agent (H2O2) with surfactant (SDS). The microstructural evolution in the fresh state, and density, porosity, and thermal conductivity in the hardened state were evaluated. As a result, the combined use of reinforcement fibers and control of pore volume is effective in the control of the microstructure of the mortar and, as a consequence, its thermal conductivity. SDS significantly contributes to foam stabilization, leading to improvements in thermal conductivity (0.15 W/m.K), Bulk density (1000 kg/m3), and a reduction in the average pore size. This suggests that these materials can be used for both thermal insulation and the construction of lightweight structural walls. © 2024, The Authors. All rights reserved.

关键词： Thermal insulation

来源：评论

学校读者我要写书评

暂无评论

Deep Style Transfer for Generation of Photo-realistic Synthetic Images of CNT Forests

Deep Style Transfer for Generation of Photo-realistic Synthe...

引用

Applied Imagery Pattern Recognition Workshop (AIPR)

作者： Prashanth Reddy Kotha Minasadat Attari Matthew Maschmann Filiz Bunyak Department of Electrical Engineering and Computer Science University of Missouri Columbia MO USA Department of Mechanical and Aerospace Engineering University of Missouri Columbia MO USA MU Materials Science and Engineering Institute University of Missouri Columbia MO USA

Carbon nanotubes (CNTs) are promising nano-materials with diverse applications in various fields, ranging from electronics and energy storage to biomedical applications. Characterization of CNT forest structures and prediction of material properties through image analytics are critical for new material design and discovery. Artificial intelligence and machine learning (AI/ML) driven approaches offer promising solutions towards these goals. These data-driven approaches rely on large amounts of annotated data for robust training. However, growing, imaging, and annotation of CNT forests are complex, time consuming, expensive processes limiting availability of such data. In this paper, we propose a novel neural style transfer pipeline to generate photo-realistic and structure-aware synthetic images of CNT forests by imposing scanning electron microscopy (SEM) like appearance to physics-based simulation results. The proposed pipeline relies on a novel wavelet-based style transfer network and a selective decision fusion mechanism that allows better preservation of the thin curvilinear structures of CNTs, particularly their intricate details and connectivity, without introducing unwanted artifacts. Experimental results and quantitative analysis demonstrate refined style transfer that generates photo-realistic images that can be used to train AI/ML- driven CNT forest image analysis systems.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Evolution of Creep Deformation near Tips of Sharp Notches and Cracks in CM247LC-DS Ni-Base Superalloy

Evolution of Creep Deformation near Tips of Sharp Notches an...

引用

2021 ASTM International Symposium on Advances in Accelerated Testing and Predictive Methods in Creep, Fatigue, and Environmental Cracking

作者： Towner, Zachary B. Smith, Kyle V. Shinde, Sachin R. Narasimhachary, Santosh B. Neu, Richard W. Muhlstein, Christopher L. Saxena, Ashok Woodruff School of Mechanical Engineering Georgia Institute of Technology 801 Ferst Dr. AtlantaGA30313 United States Formerly with Siemens Energy Inc. 11842 Corporate Blvd. OrlandoFL32817 United States Siemens Corporate Technology 1505 Westinghouse Blvd. CharlotteNC28273 United States School of Materials Science and Engineering Georgia Institute of Technology 771 Ferst Dr. NW AtlantaGA30313 United States Dept. of Mechanical Engineering College of Engineering University of Arkansas 1 University of Arkansas FayettevilleAR72701 United States

ISBN: (纸本)9780803177338

Finite element analyses were performed for varying crack tip or notch geometries and temperatures in C(T) specimens of CM247LC-DS Ni-base superalloy used in gas turbine blades to understand the accumulation of creep strains at notches. The constitutive models used considered elastic-primary-secondary creep deformation behavior. Simulations were performed under 2D plane stress, 2D plane strain, and 3D conditions for temperatures of 750°C, 850°C, and 950°C The estimated load-line displacements as a function of time from finite element analyses and from analytical expressions were validated using results from experiments conducted on notched and fatigue precracked C(T) specimens. Differences in the development of the creep zone size due to the notch tip geometry diminish in time under plane stress conditions, but they do not for plane strain conditions. Over short periods of time, small-scale creep plays a significant role in the evolution of the notch tip creep zones. The 3D analysis results show that creep zones grow at a faster rate on the surface of the specimen than in the midthickness region, and these differences are exacerbated as the notch root radius decreases. This work can potentially be the basis for formulating a theory for creep crack formation from notches in CM247LC-DS alloys. © 2023 by ASTM International.

关键词： Creep

来源：评论

学校读者我要写书评

暂无评论

High-Strength Mg-10gd-3y-1zn-0.5zr Alloy Fabricated by Wire-Arc Directed Energy Deposition: Phase Transformation Behavior and mechanical Properties

SSRN

引用

SSRN 2023年

作者： Cao, Qianhui Zeng, Caiyou Cai, Xinyi Zhang, Ruize Wang, Fude Wang, Haibo Zhang, Yu Qi, Bojin Cong, Baoqiang School of Mechanical Engineering and Automation Beihang University Beijing100191 China Capital Aerospace Machinery Co.Ltd Beijing100076 China School of Mechanical and Materials Engineering North China University of Technology Beijing100144 China Department of Materials Science and Engineering Faculty of Materials and Manufacturing Beijing University of Technology Beijing100124 China

Magnesium rare-earth (Mg-RE) alloys have great potential in lightweighting applications because of the high specific strength. Wire-arc directed energy deposition (WA-DED) exhibits great prospects for the fabrication of large-scale monolithic structural components with high manufacturing flexibility. In this work, a high-quality Mg-10Gd-3Y-1Zn-0.5Zr (wt.%, GWZ1031K) deposit was prepared via WA-DED. Electron backscatter diffraction (EBSD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) et al. are conducted to systematically explore the microstructural evolution during the WA-DED process and the subsequent heat treatment. The GWZ1031K alloy deposit fabricated by WA-DED exhibits uniform equiaxed grain structure whose average grain size is 22.3±5.6 μm. The (Mg,Zn)3(Gd,Y) phase and RE segregation can be observed along the α-Mg grain boundaries (GBs). A number of needle-like γ´/γ´´ phases embedded in the α-Mg grain interior (GI). In addition, there is a small number of tiny RE-rich cubic phase and (Gd,Y)2O3 particles. The deposit shows significantly enhanced ductility and slightly improved strength after solution treated at 500 °C for 12 h. After the solution treatment, the intergranular (Mg,Zn)3(Gd,Y) eutectics dissolve into the matrix and long period stacking ordered (LPSO) phases precipitate from the GBs into the GI, contributing to the enhancement in ductility. Besides, the LPSO phase along with the existing RE-rich cubic phase, (Gd,Y)2O3 and Zr particles at GBs also play a role in hindering grain growth. The high-density nanoscale β´ phase appears in the GI after aging treated at 200 °C for 24 h, resulting in the remarkable precipitation strengthening. In comparison with the solution-treated GWZ1031K deposit, the aging-treated exhibits a prominently improved ultimate tensile strength of 337±7 MPa in the building direction (BD) and 331±5 MPa in the travelling direction (TD). It is envisaged that the WA-DED manufacturing method will provide

关键词： Grain boundaries

来源：评论

学校读者我要写书评

暂无评论

Substantial Change in Medium Range Ordering and its Influence on Glass Forming Ability and mechanical Properties of ZrCu and ZrCuAl Metallic Glasses

SSRN

引用

SSRN 2024年

作者： Calderon Ortiz, Gabriel A. Islam, Minhazul Yoo, Geun Hee Kim, Ji Young Im, Soohyun Wang, Yuchi Wang, Yuchu Fan, Yue Wang, Yunzhi Park, Eun Soo Hwang, Jinwoo University of Wisconsin Madison United States Department of Materials Science and Engineering The Ohio State University ColumbusOH43212 United States Department of Materials Science and Engineering Research Institute of Advanced Materials Institute of Engineering Research Seoul National University Seoul08826 Korea Republic of Department of Materials Design and Innovation University at BuXalo The State University of New York BuffaloNY14260 United States Department of Mechanical Engineering University of Michigan Ann ArborMI48104 United States

We report the impact of medium-range ordering (MRO) on the glass-forming ability (GFA) and mechanical properties of ZrCu and ZrCuAl metallic glasses (MGs). Utilizing angular correlation function and direct mapping of MRO based on four-dimensional scanning transmission electron microscopy, we conducted a detailed analysis of the MRO in binary Zr50Cu50, ternary eutectic Zr50Cu40Al10, and hypoeutectic Zr65Cu25Al10 MGs. Our findings reveal significant differences in MRO types, sizes, amount, and spatial distributions among these MGs, which correspond to substantial variations in their nanoscale heterogeneity. We show that, while the formation of crystal-like MRO is possible during quenching, their growth into larger crystal nuclei is prohibited due to chemical and geometric constraints, which directly affects their GFA. We also show that Zr50Cu40Al10, with the largest and most sparsely distributed MRO, exhibits the least ductile behavior, while Zr65Cu25Al10, with the smallest and most finely distributed MRO, demonstrates the highest ductility. We explain this observation based on how MRO interferes with the formation and propagation of shear bands. Overall, this study highlights the crucial role of MRO in dictating GFA and mechanical behavior of MGs and underscores the importance of characterizing and understanding MRO to optimize the properties of MGs and amorphous materials in general. © 2024, The Authors. All rights reserved.

关键词： Metallic glass

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：