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SSRN 2023年

作者： Li, Jin Jiang, Zhaoxia Li, Jianfei Li, Boyang Wang, Xiaolian Shi, Qiwu School of Mechanical Engineering Chengdu University Chengdu610106 China College of Materials Science and Engineering Sichuan University Sichuan Chengdu610065 China

ABSTRACTBlack titanium dioxide (B-TiO2) formed by surface disorder engineering has attracted great attention due to its narrowed band gap, enhanced visible-light absorption, and various applications in photocatalysis, hydrogen production, photothermal conversion, etc. The hybrid of B-TiO2 with the other materials provides vast potential to improve it performance further. In this work, highly efficient visible-light-driven B-TiO2/activated carbon (AC) composite catalysts were synthesized by sol-gel method combined with argon heat treatment. The effect of AC content on the morphology, structure and optical properties of B-TiO2/AC was investigated. X-ray photoelectron spectroscopy (XPS) results showed a Ti-C- characteristic peak at 283.6 eV, which indicates the interaction between AC and B-TiO2. The photocatalytic experiments showed that the combination of 25wt% AC and B-TiO2 exhibited remarkable and stable photocatalytic performance for removing Rhodamine B (RhB). Particularly, under visible light irradiation (λ>420 nm), 82% of RhB was degraded within 60 minutes, which is 16% higher than B-TiO2 and 48% higher than white TiO2 (W-TiO2). Moreover, the RhB was degraded by 92% within 30 min under full-spectrum irradiation, which was 18% higher than B-TiO2 and 61% higher than W-TiO2. This work proposed a green and low-cost method for developing B-TiO2 based photocatalyst with improved performance. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

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Water absorption studies of pineapple leaf fiber/nano rice husk powder reinforced epoxy matrix hybrid composites

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materials Today: Proceedings 2022年 59卷 1498-1502页

作者： Rinawa, Moti Lal Chauhan, Prashant Sharma, Amit Kumar Kumar Singh, Hari Ankit Karuna, M.S. Department of Mechanical Engineering Government Engineering College Jhalawar Rajasthan 326023 India Department of Physics and Materials Science and Engineering Jaypee Institute of Information Technology Uttar Pradesh Noida201309 India College Uttarakhand Dehradun248001 India Department of Electronics and Communication Engineering M. J. P. Rohilkhand University U.P Bareilly243006 India Department of Chemical Engineering M.J.P. Rohilkhand University Uttar Pradesh Bareilly243006 India

In recent years, various experimental work on reinforced composites natural resources has been successfully carried out. This research focused on water absorption and bio composites from the treatment and untreated Pineapple Leaf Fiber in an epoxy resin matrix that will strengthen nano-rice husk particles. The reinforcement and filler material had different weight percentages for the production of hybrid composite specimens, while the epoxy resin matrix was constant. We employed traditional handmade techniques and effectively produced the same process for hybrid composite boards. For water absorption testing hybrid biocomposite specimens were prepared for experimental results in conformity to the ASTM standards. Epoxy resin matrix hybrid composite specimens, incorporated reinforced nano-rice husk particles, have been absorbed and are comparable to the water absorption of pineapple fibre. Experimental evidence suggests that pineapple leaf fibre samples treated chemically have a higher water absorption performance than untreated pineapple (24 Wt. per cent), which has high levels of composite husk nano-rice (6 Wt. per cent). © 2021

关键词： Water absorption

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Finite-Temperature Screw Dislocation Core Structures and Dynamics in α-Titanium

arXiv

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arXiv 2023年

作者： Liu, Anwen Wen, Tongqi Han, Jian Srolovitz, David J. Department of Materials Science and Engineering City University of Hong Kong Hong Kong Department of Mechanical Engineering The University of Hong Kong Hong Kong

A multiscale approach based on molecular dynamics (MD) and kinetic Monte Carlo (kMC) methods is developed to simulate the dynamics of an 〈a〉 screw dislocation in α-Ti. The free energy barriers for the core dissociation transitions and Peierls barriers for dislocation glide as a function of temperature are extracted from the MD simulations (based on Machine Learning interatomic potentials and optimization);these form the input to kMC simulations. Random walk dislocation trajectories from kMC agree well with those predicted by MD. On some planes, dislocations move via a locking-unlocking mechanism. Surprisingly, some dislocations glide in directions that are not parallel with the core dissociation direction. The MD/kMC multiscale method proposed is applicable to dislocation motion in simple and complex materials (not only screw dislocations in Ti) as a function of temperature and stress state. Copyright © 2023, The Authors. All rights reserved.

关键词： Molecular dynamics

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Analytical framework for liquid hydrogen storage tanks in UAVs: Thermal performance validation and structural integrity assessment

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International Journal of Hydrogen Energy 2025年 145卷 223-236页

作者： Heo, Jinmyeong Cho, Nak-Kyun Huh, Nam-Su Lee, Seung-gun Kim, Do Kyun Department of Manufacturing Systems and Design Engineering Seoul National University of Science and Technology Seoul01811 Korea Republic of Department of Mechanical System Design Engineering Seoul National University of Science and Technology Seoul01811 Korea Republic of Hydrogen Materials Research Center Korea Institute of Materials Science Changwon51508 Korea Republic of Department of Naval Architecture and Ocean Engineering Seoul National University Seoul08826 Korea Republic of Research Institute of Marine Systems Engineering Seoul National University Seoul08826 Korea Republic of

The aviation industry faces increasing pressure to transition to environmentally friendly propulsion systems, with hydrogen emerging as a promising solution for unmanned aerial vehicles (UAVs). This study presents a comprehensive analytical framework integrating thermal, structural, fatigue, and impact analyses to evaluate liquid hydrogen storage tanks for UAV applications, addressing the complex challenges in maintaining both thermal performance and structural integrity under demanding operational conditions. Experimental material characterization at cryogenic temperatures was conducted using a 100 kN tensile-fatigue testing system to obtain temperature-dependent properties of SUS316L and Al6061-T6. These properties were incorporated into comprehensive finite element analyses encompassing thermal, structural, fatigue, and drop impact assessments. Thermal analysis validated with experimental testing demonstrated that vapor-cooled shield (VCS) implementation effectively reduced boil-off rate (BOR) by approximately 15 % in small-capacity storage tank. Structural analysis identified critical stress concentration regions under UAV-specific operational loading conditions, demonstrating how this evaluation approach can guide design optimizations to address potential structural vulnerabilities during flight operations. Fatigue analysis confirmed infinite life expectancy exceeding ISO 21029-1 requirements, while drop impact analysis using an ABAQUS user subroutine VUSDFLD - based element deletion approach identified vulnerable components requiring design optimization. This integrated analytical framework establishes new standards for comprehensive safety assessment of liquid hydrogen storage systems in UAV applications, while highlighting the critical balance between thermal isolation requirements and structural integrity demands during flight operations. © 2025 Hydrogen Energy Publications LLC

关键词： Structural dynamics

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Microscopic-Plastic Deformation Behavior of Grain Boundary Precipitates in an Al-Zn-Mg Alloy

SSRN

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SSRN 2024年

作者： Ha, Sangyul Kayani, Saif Haider Lee, Kyungjun Park, Suwon Choi, Hyunjoo Seol, Jae Bok Kim, Jung Gi Sung, Hyokyung Department of Semiconductor Engineering Myongji University Yongin17058 Korea Republic of Korea Institute of Materials Science Changwon51508 Korea Republic of Department of Mechanical Engineering Gachon University Gyeonggi-do 13120 Korea Republic of Department of Materials Science and Engineering Kookmin University Seoul02707 Korea Republic of Department of Materials Engineering and Convergence Technology Gyeongsang National University Jinju52828 Korea Republic of

The nano-precipitates with minimal misfit strengthen Al-Zn-Mg alloys by impeding dislocation motion. However, grain boundary precipitates (GBPs) are known to have a completely incoherent relationship with the matrix, making them less effective in strengthening the alloys. Instead, GBPs are recognized for preoccupying elements such as Zn or Mg, thereby diminishing the quantity of nano-strengthening phases. GBPs significantly influence the deformation and fracture behaviors of Al-Zn-Mg alloys by accelerating stress localization and crack formation. In this study, we investigated how the accumulation of dislocations in the GBP areas leads to stress localization and subsequent cracking, using micropillar tests and crystal plasticity finite element method (CP-FEM) analysis. The dislocation pile-up in the GBPs causes stress localization around the grain boundaries, inducing crack initiation and leading to intergranular fracture. These findings enhance our understanding of the role of GBPs in the deformation and cracking of Al-Zn-Mg alloys and may pave the way for new concepts in managing GBPs. © 2024, The Authors. All rights reserved.

关键词： Zinc alloys

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Effect of Intermediate Cooling Rate Normalizing on Microstructure and Creep Rupture Strength of P91 Steel

SSRN

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SSRN 2023年

作者： Wang, Xue Sun, Xiaoxiang Zhang, Kai Du, Chengchao Zhang, Da School of Power and Mechanical Engineering Wuhan University Wuhan430072 China School of Materials Science & Engineering Jiangsu University Zhenjiang212013 China

In this work, the P91 sample bearing intermediate normalizing cooling rate(200 °C/h) was prepared. Its mechanical and creep properties were compared with the air-cooling (2000 °C/h) normalized sample, and the differences of microstructure evolution were also compared by employing OM, SEM/EBSD and TEM/EDS. Results showed: 1. Even though P91 steel could obtain the whole martensitic structure after intermediate cooling rate normalizing, its prior austenitic grains and martensitic laths were coarser than air-cooled one and twin martensite was appearing. Strength and hardness of the slow-cooled P91 steel were somewhat lower than the air-cooled one, but it had much lower toughness because of the formation of twin martensite. 2. After tempering, slow-cooled P91 steel recovered more completely with twin martensite disappearing, more serious dislocation density declining, larger M23C6 size and more intracrystalline M23C6 carbides, but its sub-grain size was similar to the air-cooled one. Its strength and hardness dropped evidently, and were still lower than the air-cooled one, but it witnessed a predominant improvement in toughness. 3. Creep rupture strength of the slow-cooled P91 steel was markedly lower than air-cooled one. The main cause of that was the coarsening and different distributions of M23C6 carbides, which weakened the pinning effect and ultimately resulted in degradation acceleration. Besides, more severe sub-grain polygonization and lower dislocation density could promote significant hardness diminution during creep. © 2023, The Authors. All rights reserved.

关键词： Hardness

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Experimental Investigation of Axial Pull-out Behavior of Glued-in Threaded Rods in Cross-Laminated Timber

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BioResources 2025年第3期20卷 5407-5428页

作者： Ling, Zhibin Li, Zheng Li, Zhoujun Yang, Chao Zheng, Wei Zhang, Lingfeng School of Civil Engineering Suzhou University of Science and Technology Suzhou215011 China Ministry of Education Jinan250101 China College of Material Science and Engineering Northeast Forestry University Harbin150040 China Shanghai Jianke Technical Assessment of Construction Co. Ltd Shanghai201108 China College of Mechanical and Electrical Engineering Northeast Forestry University Harbin150040 China College of Materials and Science Engineering Nanjing Forestry University Nanjing210037 China College of Civil Science and Engineering Yangzhou University Yangzhou225127 China

Cross-laminated timber (CLT), known for its high performance, prefabrication, low carbon emission, and eco-friendliness, has gained widespread adoption in the construction industry. Glued-in rod (GiR) connections, which offer a concealed appearance, high strength, withdrawal stiffness, ease of construction, and fire resistance, have become a promising solution for CLT structures. This study experimentally investigated the axial pull-out behavior of GiR connections in CLT. Forty-five CLT specimens with single GiR were designed and tested under pull-out conditions. The experimental variables included embedment length, threaded rod diameter, and rod-to-grain angle (parallel and perpendicular). The results revealed that CLT connections with GiR parallel to the grain exhibited an ascending load-slip response until peak load, followed by a sudden failure, while those with GiR perpendicular to the grain showed a linear increase to peak load with a subsequent gradual load reduction. Increasing the embedment length from 5 d to 15 d enhanced the pull-out load but decreased the average bond stress. Additionally, larger rod diameters led to higher pull-out loads and withdrawal stiffness within a certain range but reduced the average bond stress. The study also evaluated the effectiveness of existing bond stress-slip models and pull-out load prediction models for GiR connections in CLT, providing a foundation for future standardization efforts. © 2025, North Carolina State University. All rights reserved.

关键词： Construction industry

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Heterogeneous precipitate microstructure in titanium alloys for simultaneous improvement of strength and ductility

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Journal of materials science & Technology 2022年第29期124卷 150-163页

作者： Mengyuan Hao Pei Li Xuexiong Li Tianlong Zhang Dong Wang Qiaoyan Sun Libin Liu Jinshan Li Yuyou Cui Rui Yang Dongsheng Xu Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Thermal Power Research Institute Co.Ltd. Xi’an 710032China

The design of alloys with simultaneous high strength and high ductility is still a difficult ***,we propose a new approach to designing multi-phase alloys with a synergistic combination of strength and ductility by engineering heterogeneous precipitate microstructures through the activation of different transformation *** a two-phase titanium alloy as an example,phase field simulations are carried out firstly to design heat treatment schedules that involve both conventional nucleation and growth and non-conventional pseudospinodal decomposition mechanisms,and the calculated microstructures have been evaluated by crystal plasticity finite element *** to simulations,we then set a two-step heat treatment to produce bimodalα+βmicrostructure in *** mechanical testing shows that the ductility of the alloy is increased by~50%and the strength is increased by~10%as compared to its unimodal *** work may provide a general way to improve the mechanical properties of alloys through multiscale microstructure design.

关键词： Titanium alloys Phase field simulation Crystal plasticity finite element Two-step aging Pseudospinodal decomposition mechanisms Multiscale heterogeneous microstructure

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Micro/nanodevices for assessment and treatment in stomatology and ophthalmology

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Microsystems & Nanoengineering 2021年第1期7卷 1-19页

作者： An’an Sheng Long Lin Jia Zhu Jian Zhuang Jian Li Lingqian Chang Huanyu Cheng The Institute of Single Cell Engineering Beijing Advanced Innovation Center for Biomedical Engineering School of Biological Science and Medical Engineering Beihang University100191 BeijingChina Department of Stomatology Xiang’An Hospital of Xiamen University361100 XiamenChina School of Stomatology North China University of Science and Technology063210 TangshanChina Institute of Plastic Machinery and Plastic Engineering School of Mechanical and Electrical EngineeringBeijing University of Chemical Technology100029 BeijingChina Department of Engineering Science and Mechanics Pennsylvania State UniversityUniversity ParkPA 16802USA.6 School of Biomedical EngineeringResearch and Engineering Center of Biomedical MaterialsAnhui Medical University230032 HefeiChina

Micro/nanodevices have been widely applied for the real-time monitoring of intracellular activities and the delivery of exogenous substances in the past few *** review focuses on miniaturized micro/nanodevices for assessment and treatment in stomatology and *** first summarize the recent progress in this field by examining the available materials and fabrication techniques,device design principles,mechanisms,and biosafety aspects of micro/*** a discussion of biochemical sensing technology from the cellular level to the tissue level for disease assessment,we then summarize the use of microneedles and other micro/nanodevices in the treatment of oral and ocular diseases and conditions,including oral cancer,eye wrinkles,keratitis,and *** with the identified key challenges,this review concludes with future directions as a small fraction of vast opportunities,calling for joint efforts between clinicians and engineers with diverse backgrounds to help facilitate the rapid development of this burgeoning field in stomatology and ophthalmology.

关键词： treatment directions assessment

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Effects of water salinity and temperature on oil-in-water emulsions stabilized by a nonionic surfactant

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Journal of Molecular Liquids 2024年第PartA期414卷

作者： Alanazi, Khalid Mohan, Ram S. Swaroop Kolla, Srinivas Shoham, Ovadia Department of Mechanical Engineering The University of Tulsa TulsaOK74104 United States School of Materials Science and Engineering Oklahoma State University TulsaOK74106 United States McDougall School of Petroleum Engineering The University of Tulsa TulsaOK74104 United States

The goal of this work is to understand the effect of water salinity of three salts- NaCl, CaCl2, and MgCl2- on oil-in-water (O/W) emulsions stabilized by nonionic surfactants such as Tergitol 15-S-7 (T15S7). The study investigates not only the impacts of mixing speed, water salinity, and temperature but also the combined effects of salt and temperature on emulsion stability. All emulsions were created using ExxsolTM D110 and distilled water, with a surfactant concentration of 0.050 % wt. in the water phase. Two oil fractions (10 % and 25 % by volume) were studied, and oil and water separation interfaces were measured using a state-of-the-art apparatus, which can record and scan videos of free liquid separation. According to the experimental findings, at concentrations higher than the surfactant's Critical Micelle Concentration (CMC), neither of the divalent salts affects the surface tension of the aqueous solution. Divalent ions, on the other hand, were found to decrease the surfactant's effectiveness at concentrations lower than the CMC. Conversely, monovalent ions had no effect at low concentrations but further reduced the surface tension at large concentrations. All salts, however, had no effect on the volume of the emulsion for more than 4 h at 25 °C, however at 70 °C, 100 % separation happens in a matter of seconds. Decrease in mixing speed from 2500 RPM to 800 RPM caused the emulsion volume to decrease by at least 72 %. © 2024 Elsevier B.V.

关键词： Nonionic surfactants

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