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Strain effects on the interfacial thermal conductance of graphene/h-BN heterostructure

Nano Materials Science 2022年第3期4卷 227-234页

作者： Feng Liu YouKun Gong Rui Zou Huiming Ning Ning Hu Yaolu Liu Liangke Wu Fuhao Mo Shaoyun Fu Cheng Yan College of Aerospace Engineering Chongqing UniversityChongqing400044China School of Mechanical Engineering Hebei University of TechnologyTianjin300401China State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of TechnologyTianjin300130China National Engineering Research Center for Technological Innovation Method and Tool Hebei University of TechnologyTianjin300401China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha410082China School of Chemistry Physics and Mechanical EngineeringQueensland University of Technology(QUT)BrisbaneQLD4001Australia

Previous experimental and computational results have confirmed that the thermal conductivity of a twodimensional(2D) material can be considerably affected by strain. Numerous attention has been paid to explore the relevant mechanisms. However, the strain effects on the interfacial thermal conductance(ITC) of 2D heterostructure have attracted little attention. Herein, the non-equilibrium molecular dynamics(NEMD) simulations were conducted to the graphene/hexagonal boron nitride(GR/h-BN) heterostructure to investigate the strain effects on the ITC. Three types of strains were considered, i.e., tensile strain, compressive strain, and shear *** results indicate that the strain can adjust the ITC for the GR/h-BN heterostructure effectively, and the strain loading direction also influences the ITC. Generally, the tensile strain reduces the ITC of the heterostructure, in addition to the BN-C system at small tensile strain;both the compressive strain and shear strain increase the ITC,especially at a small strain. For the NB-C system, it is more sensitive to the strain loading direction and the yx shear strain of 0.06 is the most effective way to strengthen the ITC. Our results also show that the out-of-plane deformation weakens the in-plane vibration of atoms, leading to a reduction of the interfacial thermal energy transport.

关键词： Graphene h-BN Heterostructure Strain engineering Interfacial thermal conductance NEMD

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3D/4D additive-subtractive manufacturing of heterogeneous ceramics

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Journal of Materials Science & technology 2024年第34期201卷 210-221页

作者： Guo Liu Xinya Lu Xiaofeng Zhang Yan Zhao Shenghui Yi Jingjun Xu Yuqi Zhan Jianan Yin Chengcheng Feng Zhifeng Zhou Peiyu Wang Zhou Chen Yunhu He Siyao Chen Pengchao Liu Jun Zuo Yu Dai Jian Wu Sida Liu Jian Lu Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China CityU-Shenzhen Futian Research Institute Shenzhen 518045China Hong Kong Branch of National Precious Metals Material Engineering Research Center City University of Hong KongHong Kong 999077China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China National Engineering Laboratory for Modern Materials Surface Engineering Technology&The Key Lab of Guangdong for Modern Surface Engineering Technology Institute of New MaterialsGuangdong Academy of ScienceGuangzhou 510650China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China Faculty of Materials Science Shenzhen MSU-BIT UniversityShenzhen 518100China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Physics and Materials Nanchang UniversityNanchang 330031China

The manufacturing of heterogeneous high-temperature material components is challenging for use in practical ***-dimensional(3D)printing provides solutions to programmable constructing ceramic ***,the development of heterogeneous ceramics is limited by low flexibil-ity of heterogeneity,geometrical complexity,structural resolution,manufacturing efficiency,and mate-rial *** this study,we demonstrated flexible and rapid approaches for fabricating complicated and precise heterogeneous ceramics by shape-changing(4D)or shape-keeping(3D)additive-subtractive manufacturing(ASM)*** shape-changing strategy for heterogeneous ceramics was achieved by global ceramization of heterogeneous precursors,while the shape-keeping strategy for heterogeneous ceramics was achieved by local receramization of homogeneous *** element analysis(FEA)simulations of the influence of the thermal shrinkage dominant in the shape-changing strategy on the shape deformation of heterogeneous ceramics could be valuable predictions of the experimental *** 3D/4D ASM methods are generic for high-temperature materials and extendable to metallic and dia-mond materials.

关键词： 3D/4D printing Additive-subtractive manufacturing Heterogeneous ceramics Elastomer-derived ceramics Local receramization

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Research of injury mapping relationship of lumbar spine in reclined occupants between anthropomorphic test devices and human body model

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Chinese Journal of Traumatology 2025年第2期28卷 130-137页

作者： Yu Liu Jing Fei Xin-Ming Wan Pei-Feng Wang Zhen Li Xiao-Ting Yang Lin-Wei Zhang Zhong-Hao Bai China Automotive Engineering Research Institute Co. Ltd.Chongqing401122China School of Vehicle and Mobility Tsinghua UniversityBeijing100084China State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan UniversityChangsha410082China

Purpose:To judge the injury mode and injury severity of the real human body through the measured values of anthropomorphic test devices(ATD)injury indices,the mapping relationship of lumbar injury between ATD and human body model(HBM)was ***:Through the ATD model and HBM simulation,the mapping relationship of lumbar injury between the 2 subjects was *** sled environment consisted of a semi-rigid seat with an adjustable seatback angle and a 3-point seat belt system with a seatback-mounted *** seatback recline states of 25°,45°,and 65°were designed,and the seat pan angle was maintained at 15°.A 23 g,47 km/h pulse was *** validity of the finite element model of the sled was verified by the comparison of ATD simulation and test *** model was the test device for human occupant restraint for autonomous vehicles(THOR-AV)dummy model and HBM was the total human model for safety(THUMS)*** posture of the 2 models was adjusted to adapt to the 3 seat *** lumbar response of THOR-AV and the mechanical and biomechanical data on L1-L5 vertebrae of THUMS were output,and the response relationship between THOR-AV and THUMS was descriptive statistically ***:Both THOR-AV and THUMS were submarined in the 65°seatback angle *** the change of seatback angle,the lumbar spine axial compression force(F_(z))of THOR-AV and THUMS changed in the similar *** maximum F_(z) ratio of THOR-AV to THUMS at 25°and 45°seatback angle cases were 1.6 and *** flexion moment(M_(y))and the time when the maximum M_(y) occurred in the 2 subjects were very *** particular,the form of moment experienced by the L1-L5 vertebrae of THUMS also *** changing trend of M_(y) measured by THOR-AV over time can reflect the changing trend of maximum stress of L1 and L2 of ***:The F_(z) of ATD and HBM presents a certain proportional relationship,and there is a mapping relationship between the 2 subjects on F_(z).The m

关键词： Reclined posture Lumbar spine injury Injury mapping Anthropomorphic test devices Human body model

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An Efficient Thermoelastic Topology Optimization Method for Large-Scale Structures Based on Parallel Computing

SSRN

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SSRN 2024年

作者： Rong, Xuanpei Zheng, Jing Jiang, Chao Luo, Zhen Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment School of Mechanical and Vehicle Engineering Hunan University Hunan Province Changsha410082 China School of Mechanical and Mechatronic Engineering University of Technology Sydney 15 Broadway UltimoNSW2007 Australia State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body China

The optimization of complex structures considering thermal-mechanical coupling is a critical issue in current equipment design. The integration of large-scale thermoelastic topology optimization within the parallel computing framework represents a pivotal advancement in structural engineering. Large-scale thermoelastic topology optimization has historically confronted two main difficulties: Firstly, the conflicts among multi-field performance criteria under large-scale topology variables lead to issues such as blurring in low-density regions, constraint failures, and instability in the optimization process. Secondly, the computational cost of performing finite element calculations and optimization in a multi-physics environment is prohibitively high. Building on these considerations, this paper develops an effective approach for large-scale thermo-mechanical coupled topology optimization, utilizing parallel computing to enhance efficiency. In addressing the issue of non-convergence in the distribution of thermal and elastic materials within low-density regions under thermoelastic conditions, a modified thermoelastic material interpolation model is proposed. Subsequently, the compliance sensitivity with respect to the topological variables is obtained from the derived explicit expressions and the iterative topological variables are renewed. An assembly-free matrix parallel strategy is introduced to substantially lower the computational expenses associated with thermo-mechanical coupling finite element simulation models and topology optimization processes. This strategy utilizes an enhanced Preconditioned Conjugate Gradient (PCG) iterative algorithm and a stepwise computation approach, effectively diminishing the optimization's computational cost. Finally, the proposed thermoelastic topology optimization method for complex thermos-mechanical coupled structures is implemented through co-programming of MATLAB, CUDA and ABAQUS, and a series of representative examples are

关键词： MATLAB

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Selective laser sintering of phase change composites for thermal management systems

Selective laser sintering of phase change composites for the...

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作者： Liang, Bangchao Zhou, Dan Han, Xiaoxiao National Engineering Research Center for Hight Efficiency Grinding Hunan University Changsha410000 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410000 China School of Transportation and Vehicle Engineering Shandong University of Technology Shandong Zibo255000 China

Phase change composites have great application potential in the thermal management system because of their high latent heat and high thermal conductivity. However, the problems of the complex manufacturing process and waste of materials in the processing process have prevented composite phase change materials from further application in industry. In this paper, the composite phase change materials powder was prepared by liquid nitrogen grinding method, and the parameters such as thermal conductivity, latent heat capacity, powder flowability, particle size distribution and microstructure were tested. The results show that the parameters of composite phase change materials powder meet the requirements of selective laser sintering. Finally, composite phase change materials parts are successfully printed by selective laser sintering machine, thus it simplifies the manufacturing process, reduces the waste of materials, and expands the manufacturing mode of composite phase change materials. © 2022

关键词： Latent heat

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相溶解协同提升高熵合金的强度和塑性

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Science China Materials 2023年第3期66卷 1205-1214页

作者：王睿鑫李理唐宇雷智锋李甲马超李顺叶益聪朱利安艾园林方棋洪白书欣吕昭平 College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China College of Materials Science and Engineering Hunan UniversityChangsha 410082China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing 100871China

热处理是金属材料热机械加工的常用手段.随着热处理温度的升高而湮灭的缺陷通常导致材料的塑性提升而强度降低.本研究中,我们通过提高热处理温度促进相溶解而协同提升了TiZrNbTa高熵合金的强度和塑性.当热处理温度从800提升至1250°... 详细信息

热处理是金属材料热机械加工的常用手段.随着热处理温度的升高而湮灭的缺陷通常导致材料的塑性提升而强度降低.本研究中,我们通过提高热处理温度促进相溶解而协同提升了TiZrNbTa高熵合金的强度和塑性.当热处理温度从800提升至1250°C,合金的拉伸屈服强度提高了40%,达到1003±16 MPa.同时,合金的伸长率增加了近一倍,达到16.79%±1.03%.热处理温度提升引起的相溶解加剧了晶格畸变,从而增强了晶格摩擦应力并提升了屈服强度.相溶解也降低了界面失配并缓解了应力集中.此外,1250°C热处理合金中的局部化学有序结构促进了位错共平面滑移和位错增殖.两种机制共同提升了合金的塑性.该研究不仅扩展了关于金属材料中热处理和相溶解的理解,而且也为合金的强韧化设计提供了思路.

关键词：金属材料热机械加工平面滑移高熵合金拉伸屈服强度摩擦应力晶格畸变应力集中

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Time series clustering adaptive enhanced method for time-dependent reliability analysis and design optimization

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Computer Methods in Applied Mechanics and engineering 2025年 443卷

作者： Zhang, Dequan Zhao, Ying Yang, Meide Jiang, Chao Han, Xu Li, Qing State Key Laboratory of Intelligent Power Distribution Equipment and System School of Mechanical Engineering Hebei University of Technology Tianjin 300401 China State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney New South Wales Sydney2006 Australia

Adaptive Kriging model has gained growing attention for its effectiveness in reducing the computational costs in time-dependent reliability analysis (TRA). However, the existing methods struggle to identify critical sample regions, leverage parallel computational resources, and assess the value for sample trajectories, thus restricting improvement in accuracy and efficiency. To address the challenges, this study proposes a time series clustering adaptive enhanced method (TSCM). TSCM first employs the time series clustering technique to partition the sample region efficiently. A novel time-dependent Kriging occurrence learning function is then introduced to account for both the uncertainty of sample trajectories and its influence on the approximated limit state boundary. Subsequently, an adaptive sampling strategy is developed to select training samples in parallel, guided by an uncertainty-based assessment of sample regions. After that, a time-dependent error-based stopping criterion is introduced to determine the training stage and terminate the update process. Finally, TSCM is extended to time-dependent reliability-based design optimization problems. Several numerical examples and an engineering case study demonstrate the superior computational efficiency and accuracy of the proposed method. © 2025

关键词： Time-to-failure

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Effect of assessment methods on the determination of the critical wind speeds of high-speed trains

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Transportation safety and Environment 2022年第3期4卷 32-42页

作者： Shiwei Yang Rong Liu Dongrun Liu CRRC MEISHAN CO.LTD Meishan 620032SichuanChina School of Mining Engineering Anhui University of Science and TechnologyHuainan 232001AnhuiChina Key Laboratory of Traffic Safety on Track of Ministry of Education School of Traffic&Transportation EngineeringCentral South UniversityChangsha 410075China Joint International Research Laboratory of Key Technology for Rail Traffic Safety Central South UniversityChangsha 410075China National&Local Joint Engineering Research Centre of Safety Technology for Rail Vehicle Central South UniversityChangsha 410075HunanChina.

Critical wind speed can play an important guiding role in developing an initial train operation schedule and knowledge of it mayprevent safety risks for a train. Hence, the efficient and accurate calculation of the critical wind speeds of trains is critical. Thisstudy addresses this topic and focuses on the influence of different methods on the calculation of the critical wind speed. The resultreveals that the five-mass and three-mass methods can both be used to determine the critical wind speed of a train more quicklywith acceptable accuracy, but these two methods overestimate the crosswind safety risk of the *** the increase of the train’soperating speed, the nonlinearity of the vehicle system is further enhanced. In particular, the influence of the rollingmotion betweenthe car body and the bogie is more prominent, and the results of the five-mass method and the multi-body simulation method tendto be the closest. Last but not least, the damping parameters and inertial forces ignored by the quasi-static method will effectivelyreduce the wind forces transmitted to the track, resulting in a smaller overturning coefficient and higher critical wind speed.

关键词： Critical wind speed three-mass method five-mass method multi-body simulation high-speed train

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Asymmetric electron distribution induced intrinsically strong anisotropy of thermal transport in bulk CrOCl

arXiv

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arXiv 2024年

作者： Tian, Qikun Yang, Qi Huang, An Peng, Bo Zhang, Jinbo Zheng, Xiong Zhou, Jian Qin, Zhenzhen Qin, Guangzhao State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China Key Laboratory of Materials Physics Ministry of Education School of Physics Zhengzhou University Zhengzhou450001 China

Anisotropic heat transfer offers promising solutions to the efficient heat dissipation in the realm of electronic device thermal management. However, the fundamental origin of the anisotropy of thermal transport remains mysterious. In this paper, by combining frequency domain thermoreflectance (FDTR) technique and first-principles based multiscale simulations, we report the intrinsic anisotropy of thermal transport in bulk CrOCl, and further trace the origin of the anisotropy back to the fundamental electronic structures. The in-plane and cross-plane thermal conductivities (κ) at 300 K are found to be 21.6 and 2.18 Wm−1K−1, respectively, showcasing a strong κin-plane/κcross-plane ratio of ~10. Deep analysis of orbital-resolved electronic structures reveals that electrons are mainly distributed along the in-plane direction with limited interlayer distribution along the cross-plane direction, fundamentally leading to the intrinsic anisotropy of thermal transport in bulk CrOCl. The insight gained in this work would shed light on the design of advanced thermal functional materials. Copyright © 2024, The Authors. All rights reserved.

关键词： Anisotropy

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Interaction-Aware Cut-In Trajectory Prediction and Risk Assessment in Mixed Traffic

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IEEE/CAA Journal of Automatica Sinica 2022年第10期9卷 1752-1762页

作者： Xianglei Zhu Wen Hu Zejian Deng Jinwei Zhang Fengqing Hu Rui Zhou Keqiu Li Fei-Yue Wang the College of Intelligence and Computing Tianjin UniversityTianjin 300350 the China Automotive Technology and Research Center Co.Ltd. Tianjin 300300China the State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China the Department of Mechanical and Mechatronics Engineering University of WaterlooWaterlooON N2L3G1Canada the School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China the Macao University of Science and Technology MacaoChina the Waytous Inc. Qingdao 266000China IEEE the State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China

Accurately predicting the trajectories of surrounding vehicles and assessing the collision risks are essential to avoid side and rear-end collisions caused by *** improve the safety of autonomous vehicles in the mixed traffic,this study proposes a cut-in prediction and risk assessment method with considering the interactions of multiple traffic *** integration of the support vector machine and Gaussian mixture model(SVM-GMM)is developed to simultaneously predict cut-in behavior and *** dimension of the input features is reduced through Chebyshev fitting to improve the training efficiency as well as the online inference *** on the predicted trajectory of the cut-in vehicle and the responsive actions of the autonomous vehicles,two risk measurements are introduced to formulate the comprehensive interaction risk through the combination of Sigmoid function and Softmax ***,the comparative analysis is performed to validate the proposed method using the naturalistic driving *** results show that the proposed method can predict the trajectory with higher precision and effectively evaluate the risk level of a cut-in maneuver compared to the methods without considering interaction.

关键词： Cut-in behavior interaction-aware mixed traffic risk assessment trajectory prediction

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