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On tensile and bending failure behaviors of scarf repaired laminated composites

Thin-Walled Structures 2025年 215卷

作者： Yuansong Wang Yang Wei Quantian Luo Qing Li Shunfeng Li State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Changsha 410082 PR China School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney Sydney NSW 2006 Australia

With the more extensive use of carbon fiber-reinforced plastic (CFRP) composites, the development of time and cost-effective repair techniques is becoming increasingly important. In this study, the in-plane and out-of-plane mechanical performance of scarf repaired CFRP laminates are first investigated under uniaxial tensile and three-point bending tests experimentally, and then studied using finite element (FE) analysis numerically. In the experiments, a dynamic monitoring system comprised of digital image correlation (DIC) and infrared thermography is used to characterize the damage accumulation of the scarf repaired specimens. The strain variation and thermal information in the bonding area measured by DIC and infrared cameras are used to reveal the damage mechanism of scarf repaired CFRP laminates. In the simulation, three-dimensional high-fidelity FE models based on the Hashin failure criterion and cohesive zone model are established to reproduce the tensile and bending failure behaviors. Based on the validated FE model, the roles of the scarf angle and adhesive properties on the mechanical performance of scarf-repaired joints are investigated. The results show that the flexural strength of the scarf repair is easier to recover than the tensile strength. As the scarf angle decreases, the probability of adhesive shear failure is higher than that of peel failure. In addition, under small scarf angles, both the tensile and flexural strength decrease dramatically with an increase in the scarf angle, and this effect can be attenuated by improving adhesive properties.

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Multiscale mechanics of architectured dual-phase high-entropy alloys: Dislocation-interface synergy governing strength-ductility paradigm

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Journal of Alloys and Compounds 2025年 1035卷

作者： Heng Wang Weizheng Lu Bin Liu Jia Li Peter K. Liaw Qihong Fang State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 PR China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 PR China Department of Materials Science and Engineering The University of Tennessee Knoxville TN 37996 USA

Dual-phase high-entropy alloys (DP-HEAs) represent a paradigm shift in structural materials design, yet their unexplored deformation physics creates critical knowledge gaps hindering performance optimization. Here, we report the deformation behaviour and mechanical strengthening in the DP-HEAs with a variable Al content using crystal plasticity finite element (CPFE) method during the straining tests. The results show that the yield strength predicted by the hardening model aligns well with the existing experimental data. The body-centered cubic domains develop higher geometrically necessary dislocation density than face-centered cubic regions, acting as dynamic strengthening networks through phase boundary pinning effects. Stress concentration is notably pronounced at grain boundaries, particularly at phase boundaries, where significant stress, strain, and dislocation density gradients are observed. Furthermore, the activation of slip systems in the adjacent regions of different phases demonstrates a high degree of consistency. The proposed interface-mediated strain redistribution mechanism establishes new design rules for metastable HEA systems. This computational paradigm enables predictive optimization of phase-specific chemical ordering, providing a roadmap for developing HEA coatings in extreme mechanical environments.

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Analyzing disinfection by-products yield and mechanisms in UV/Cl2 using response surface methodology and quantitative structure-activity relationship models

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Chemosphere 2023年第1期341卷

作者： Yao, Jingjing Li, Haipu Ong, Say Leong Hu, Jiangyong Department of Civil & Environmental Engineering National University of Singapore 1 Engineering Drive 2 Singapore 117576 Singapore Pillar of Engineering Product Development Singapore University of Technology and Design 8 Somapah Road 487372 Singapore Center for Environment and Water Resources College of Chemistry and Chemical Engineering Central South University Changsha410083 China Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety Changsha410083 China NUS Environmental Research Institute National University of Singapore 5A Engineering Drive 1 Singapore 117411 Singapore

The study aimed to investigate the formation of halogenated disinfection byproducts (DBPs) during applying UV/chlorine (UV/Cl2) and unravel the interactive impacts of critical operational parameters and the mechanisms behind DBPs formation. Response surface methodology and quantitative structure-activity relationship models were developed to evaluate the contribution of electrophilic, nucleophilic, and free radical reactions to the formation of DBPs in UV/Cl2. The study found that Cl2 and its interactions dominated the total DBPs and non-Br-DBPs formation, while Br− and the Cl2–Br− interaction played a decisive role in the Br-DBPs formation. The study also observed significant interactions of Br, Cl2, and pH on chloroform, bromodichloromethane, dichloroacetonitrile, 1,1-dichloro-2-propanone, trichloroactic acid, and chlorodibromoacetic acid formations, while no evident interaction on chloral hydrate, dibromochloromethane, trichloroacetone, dibromoacetic acid, and bromodichloroacetic acid formations. The electrophilic substitution of HOBr mainly controlled the formation of trihalomethanes, and the contribution of nucleophilic, electrophilic, and free radical (•OH, Cl•, Cl2•- and ClO•) reactions depended on the molar ratio of Cl2 to Br, and pH-determined hydrolysis rate constants of DBPs and the types of free radicals. Overall, the response surface methodology and quantitative structure-activity relationship models provided a reference for revealing DBPs formation mechanisms in other disinfection processes. © 2023 Elsevier Ltd

关键词： Rate constants

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High-performance lateral MoS2-MoO3 heterojunction phototransistor enabled by in-situ chemical oxidation

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Science China Materials 2020年第6期63卷 1076-1084页

作者： Kaixi Bi Qiang Wan Zhiwen Shu Gonglei Shao Yuanyuan Jin Mengjian Zhu Jun Lin Huawei Liu Huaizhi Liu Yiqin Chen Song Liu Huigao Duan College of Mechanical and Vehicle Engineering State Key Laboratory of Advanced Design and Manufacturing for Vehicle BodyHunan UniversityChangsha 410082China School of Physics and Electronics Hunan UniversityChangsha 410082China Institute of Chemical Biology and Nanomedicine(ICBN) State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China College of Science National University of Defense TechnologyChangsha 410073China

Construction of in-plane p-n junction with clear interface by using homogenous materials is an important issue in two-dimensional transistors,which have great potential in the applications of next-generation integrated circuit and optoelectronic ***,a controlled and facile method to achieve p-n interface is *** sulfide(MoS2)has shown promising potential as an atomic-layer ntype semiconductor in electronics and ***,we developed a facile and reliable approach to in-situ transform n-type MoS2 into p-type MoO3 to form lateral p-n junction via a KI/I2 solution-based chemical oxidization *** lateral MoS2/MoO3 p-n junction exhibits a highly efficient photoresponse and ideal rectifying behavior,with a maximum external quantum efficiency of^650%,~3.6 mA W-1 at 0 V,and a light switching ratio of^*** importance of the built-in p-n junction with such a high performance is further confirmed by high-resolution photocurrent *** to the high photoresponse at low source-drain voltage(VDS)and gate voltage(VG),the formed MoS2/MoO3 junction p-n diode shows potential applications in low-power operating photodevices and logic *** findings highlight the prospects of the local transformation of carrier type for high-performance MoS2-based electronics,optoelectronics and CMOS logic circuits.

关键词： molybdenum disulfide lateral p-n junction photocurrent optoelectronics

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Unsteady Aerodynamic Performance of a Maglev Train: The Effect of the Ground Condition

Research Square

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Research Square 2021年

作者： Meng, Shi Chen, Guang Zhou, Dan Meng, Shuang Key Laboratory of Traffic Safety on Track of Ministry of Education Central South University Hunan Changsha410075 China School of Traffic & Transportation Engineering Central South University Hunan Changsha410075 China National & Local Joint Engineering Research Centre of Safety Technology for Rail Vehicle Changsha410000 China

The effect of the ground condition on unsteady aerodynamic performance of maglev train was numerically investigated with an IDDES (Improved Delayed Detached Eddy Simulation) method. The accuracy of the numerical method has been validated by wind tunnel experiments. The flow structure, slipstream and aerodynamic force around the train under stationary and moving ground conditions were compared. Compared with the stationary ground condition, the vortex structure under the condition of moving ground generated by the wake region is narrower and higher because of the track. Near the nose point of the head and tail vehicles, the peak value of slipstream under the condition of moving ground is slightly higher than that under stationary ground. In the wake area, the effect of the main vortex structure on both sides of the tail vehicle and the track makes the vortex structure in the wake area stronger than that under moving ground, the slipstream peak is larger and the locus thereof is further forward. Under the two ground conditions, the vortex structure is periodically shed from both sides of the train into the wake area, and the shedding frequency of the main vortex under the moving ground condition is lower than that under the stationary ground condition. Moving ground can increase the resistance of the maglev train, reduce the lift of the maglev train, and decrease the standard deviation of the maglev train’s aerodynamic force. © 2021, CC BY.

关键词： Wakes

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Assessing the Environmental Impact of Integrating Insect Farming and Anaerobic Digestion in a Food Waste-Based Biogas Facility

SSRN

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SSRN 2024年

作者： Wang, Jianying Yu, Liang Chi, Ting Jiang, Yan Ma, Jingwei Yuan, Hairong Ai, Ping Zhao, Quan-Bao Yu, Han-Qing CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China College of Environment and Safety Engineering Fuzhou University Fujian350116 China Department of Biological Systems Engineering Washington State University PullmanWA99164 United States Department of Apparel Merchandising Design and Textiles Washington State University PullmanWA99164 United States Stantec Ltd. 170 Ivy Exchange Dublin 1 Parnell Square West DublinDO1 N938 Ireland Hunan Engineering Research Center of Water Security Technology and Application College of Civil Engineering Hunan University Changsha410082 China Centre for Resource and Environmental Research Beijing University of Chemical Technology 15 Beisanhuan East Road Chaoyang District Beijing100029 China College of Engineering Huazhong Agricultural University Wuhan430070 China State Key Laboratory of Chemical Resource Engineering China China

Combining anaerobic digestion (AD) with black Soldier Fly (BSF) bioconversion offers promising advantages beyond the typical AD system. It not only alleviates stress on the anaerobic system and minimizes biogas residue but also generates dried larvae, a valuable resource for animal feed. However, a comprehensive environmental impact assessment is crucial to fully understand its potential. This study employs Mass Flow Analysis and Life Cycle Assessment (LCA) to quantitatively compare the environmental implications of a combined BSF-AD system and a conventional mesophilic AD system with hydrothermal pretreatment, referred to as Business as Usual (BAU), for food waste treatment. Energy consumption (EC) was analyzed using data from an operational plant in China, revealing a lower EC for BSF-AD (162.67 kWh/tonne) compared to BAU (175.24 kWh/tonne). The LCA further highlights the BSF-AD system’s reduced Climate Change impact (82.9 kg CO2-eq./tonne) compared to BAU (123 kg CO2-eq./tonne). These findings demonstrate the clear environmental advantages of combining AD with BSF bioconversion, including carbon footprint reduction and substantial resource recovery potential. This paves the way for informed decision-making in food waste treatment and promotes insect farming as a sustainable waste management solution. © 2024, The Authors. All rights reserved.

关键词： Life cycle

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Deep Learning-Based Object Pose Estimation: A Comprehensive Survey

arXiv

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arXiv 2024年

作者： Liu, Jian Sun, Wei Yang, Hui Zeng, Zhiwen Liu, Chongpei Zheng, Jin Liu, Xingyu Rahmani, Hossein Sebe, Nicu Mian, Ajmal The National Engineering Research Center for Robot Visual Perception and Control Technology College of Electrical and Information Engineering the State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China The School of Architecture and Art Central South University Changsha410082 China The Department of Automation Tsinghua University Beijing100084 China The School of Computing and Communications Lancaster University LA1 4YW United Kingdom The Department of Information Engineering and Computer Science University of Trento Trento38123 Italy The Department of Computer Science The University of Western Australia WA6009 Australia

Object pose estimation is a fundamental computer vision problem with broad applications in augmented reality and robotics. Over the past decade, deep learning models, due to their superior accuracy and robustness, have increasingly supplanted conventional algorithms reliant on engineered point pair features. Nevertheless, several challenges persist in contemporary methods, including their dependency on labeled training data, model compactness, robustness under challenging conditions, and their ability to generalize to novel unseen objects. A recent survey discussing the progress made on different aspects of this area, outstanding challenges, and promising future directions, is missing. To fill this gap, we discuss the recent advances in deep learning-based object pose estimation, covering all three formulations of the problem, i.e., instance-level, category-level, and unseen object pose estimation. Our survey also covers multiple input data modalities, degrees-of-freedom of output poses, object properties, and downstream tasks, providing the readers with a holistic understanding of this field. Additionally, it discusses training paradigms of different domains, inference modes, application areas, evaluation metrics, and benchmark datasets, as well as reports the performance of current state-of-the-art methods on these benchmarks, thereby facilitating the readers in selecting the most suitable method for their application. Finally, the survey identifies key challenges, reviews the prevailing trends along with their pros and cons, and identifies promising directions for future research. We also keep tracing the latest works at Awesome-Object-Pose-Estimation. Copyright © 2024, The Authors. All rights reserved.

关键词： Benchmarking

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A safety-reinforced mutual pulse heating strategy based on microscopic-state estimation for power-redistributable lithium-ion battery pack

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Energy 2025年 330卷

作者： Hao Zhong Fei Lei Jie Liu Fei Ding Wenhao Zhu Haijun Wang School of Intelligent Engineering and Intelligent Manufacturing Hunan University of Technology and Business Changsha 410205 PR China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha 410082 PR China College of Automotive and Mechanical Engineering Changsha University of Science and Technology Changsha 410114 PR China

Advanced heating is essential for mitigating temporary losses in battery capacity and peak power at low temperatures, thereby enhancing utilization efficiency and reducing safety risks. Expanding upon our prior research, this paper proposes a safety-reinforced mutual pulse heating (MPH) strategy based on microscopic-state estimation, in which multiplexing converter-based drivers are reused as on-board heating topologies. An adaptive super-twisting sliding mode observer is utilized to capture battery solid-liquid phase Li + concentration, electrode and electrolyte potentials, and side-reaction overpotentials. Then, a microscopic-state constraints-based MPH current prediction method is formulated to delineate the safe operational area of battery micro-states. The MPH current amplitude is updated by an online negative feedback-based optimization controller, while the heating duty ratio is still adjusted using fuzzy feedback mechanisms. Experimental validation of the proposed method is conducted across five critical metrics: heating duration, temperature-rise rate, safety risk, temperature uniformity, and degradation. The method demonstrated its efficacy by elevating the battery temperature from −20 °C to 0 °C within 178.3 s, while keeping the microscopic states within safe thresholds, with a peak temperature gradient of <2 °C. During 800 heating cycles, battery integrity remains intact as evidenced by stable capacity, coulomb efficiency, internal resistance, and differential voltage curves.

关键词： Electrochemical-thermal model Lithium-ion battery Microscopic-state estimation Multiplexing converter Mutual pulse heating safety enhancement

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Model Predictive Control-Assisted Energy Management Strategy for Hybrid Mining Dump Trucks Based on Speed and Slope Prediction

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Electronics 2025年第10期14卷 1999-1999页

作者： Guojin Xie Rongjun Ding Heping Xie Hongmao Qin Yougang Bian School of Mechanical and Automotive Engineering Guangxi University of Science and Technology Liuzhou 545616 China State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 China Wuxi Intelligent Control Research Institute of Hunan University Wuxi 214115 China Xuzhou XCMG Mining Machinery Co. Ltd. Xuzhou 210009 China

This article proposes an innovative energy management strategy for hybrid multi-source dump trucks operating under real slope conditions in mining areas. Although previous studies have addressed the energy management issues of hybrid vehicles, few studies have taken into account complex environmental factors such as slopes under actual working conditions. The article overcomes this limitation by integrating a radial basis function (RBF) neural network to directly and accurately predict future vehicle demand power, thereby optimizing the DP-MPC strategy and improving energy efficiency. The results indicate that, compared with the traditional MPC strategy, the proposed strategy reduces fuel consumption by 3.34% and engine start-stop events by 76.2%. Additionally, when compared with another strategy that uses historical data to predict future speed and slope, calculates the vehicle’s future power demand, and incorporates it into the DP-MPC algorithm, the proposed strategy achieves comparable fuel consumption while also reducing engine start-stop events by 69.7%. Notably, the average calculation time for each step is 43.85 ms, which is substantially less than the sampling time of 1 s. To further confirm the real-time performance of the strategy, a hardware-in-the-loop (HIL) test is conducted.

关键词： hybrid mining dump truck model predictive control (MPC) artificial neural network model dynamic programming (DP) energy management strategy

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Tailoring structural, mechanical, and electronic properties of (Ti0.25Ta0.25Zr0.25Nb0.25-xLax)C high-entropy carbide ceramics via rare-earth La incorporation: A comprehensive first-principles study

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Ceramics International 2025年

作者： Wang, Zhipeng Yu, Zhaowen Zhang, Linkun Liu, Feng Huang, Lan Wang, Yan Tan, Liming Wang, Zi Ma, Li Tang, Pingying School of Materials Science and Engineering Dongguan University of Technology Guangdong Province Dongguan523808 China State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Hunan Province Changsha410082 China State Key Laboratory for Powder Metallurgy Central South University Hunan Province Changsha410083 China Guangxi Key Laboratory of Functional Information Materials and Intelligent Information Processing Nanning Normal University Guangxi Province Nanning530001 China

High-entropy carbide ceramics (HECCs) exhibit exceptional material properties, but their underlying physical mechanisms are underexplored. This study utilizes first-principles calculations to examine the influence of rare-earth La on the structural, mechanical, dislocation, and electronic properties of (Ti0.25Ta0.25Zr0.25Nb0.25-xLax)C (x = 0∼18.75 %) HECCs. key parameters, including formation enthalpy, lattice distortion, elastic constants, mechanical modulus, and density of states, are systematically analyzed as a function of La content. Results show that La preferentially substitutes Nb sites, forming thermodynamically stable rock-salt structures. Increased La content induces severe lattice distortion, reduces resistance to bulk, elastic, and shear deformation, and enhances ductility while decreasing brittleness. La incorporation also lowers Vickers hardness and yield strength, weakening crack resistance. Notably, (Ti0.25Ta0.25Zr0.25Nb0.0625La0.1875)C exhibits minimal energy factors and maximum dislocation width, facilitating dislocation nucleation and twinning. A rightward shift and reduced peak heights in valence band of total density of states curves with increasing La content indicate enhanced electron delocalization and reduced brittleness. These findings highlight the potential of La substitution to tailor structural, mechanical, and electronic properties in (Ti0.25Ta0.25Zr0.25Nb0.25-xLax)C HECCs, offering insights for designing ductile HECCs. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Vickers hardness

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