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Modeling high-speed cutting of SiC_(p)/Al composites using a semi-phenomenologically based damage model

Chinese Journal of Aeronautics 2021年第8期34卷 218-229页

作者： Junfeng XIANG Lijing XIE Feinong GAO School of Civil Aviation Northwestern Polytechnical UniversityXi'an 710072China Key Laboratory of Fundamental Science for Advanced Machining Beijing Institute of TechnologyBeijing 100081China

In this paper,we attempts to investigate cutting mechanisms in high-speed cutting of Al6061/Si C_(p)/15p composites using a semi-phenomenologically based damage model in the equivalent homogeneous material(EHM)*** combining macroscale EHM modeling and underlying microscale physical mechanisms,a feasible semi-phenomenological plastic model is proposed for prediction of cutting forces and chip morphology during high-speed turning Al6061/Si C_(p)/15p *** model incorporates the modified Weibull weakest-link effect to represent the strain-based damage evolution in large *** proposed semi-phenomenological constitutive model is implemented by compiling material subroutines into cutting finite element(FE)*** effects of the critical shear stresses on chip formation that depend on the toolchip frictional coefficient are accounted for in the cutting FE *** chip formation mechanism affecting material removal behaviors during high-speed turning is further *** capabilities of the proposed constitutive model are evaluated by comparing cutting forces and chip morphologies between experiments and simulations at different cutting speeds associated with strain *** EHM-based and microstructure-based models are further compared in both computational efficiency and *** simulation results show that the developed semiphenomenological constitutive formalism and cutting model are promising and efficient tools for further investigation of dynamic mechanical and cutting behaviors of particle-reinforced composites with different volume fraction and particle size.

关键词： Chip morphology Damage evolution High-speed cutting Semi-phenomenological plasticity SiC_(p)/Al composites

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Evolution of superconductivity and corresponding electronic structure in pressurized Nb_(3)Sn

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Superconductivity 2025年第1期13卷 17-22页

作者： Wenxuan Chen Xintian Chen Yangfan Gao Yazhou Zhou Shu Cai Jinyu Zhao Ke Yang Aiguo Li Sheng Jiang Qi Wu Defang Duan Jing Guo Liling Sun Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Center for High Pressure Science&Technology Advanced Research Beijing 100094China Shanghai Synchrotron Radiation Facilities Shanghai Advanced Research InstituteChinese Academy of SciencesNo.239 Zhangheng RoadShanghai 201204China Key Laboratory of Material Simulation Methods&Software of Ministry of Education and State Key Laboratory of Superhard Materials College of physicsJilin University130012ChangchunChina

The studies on superconductors under extreme conditions offer valuable insights for assessing their potential in new ***_(3)Sn,an intermetallic alloy with an A15 structure,is a key commercial superconductor known for its high critical current and magnetic field ***,we systematically investigated the physical properties of Nb_(3)Sn under high *** findings reveal that superconductivity in Nb_(3)Sn remains robust up to∼142 GPa,demonstrating remarkable stability despite a gradual suppression of��c with increasing ***-principles calculations indicate that the pressure-dependent superconducting behavior is primarily driven by variations in the density of states of Nb’s d-electrons,particularly contributions from the d_(x^(2)-y^(2)) and d_(z^(2)) ***,we predict the potential for synthesizing Nb_(3)Sn films and demonstrate that biaxial strain induced by suitable substrates can preserve their superconducting *** comprehensive study not only enhances our understanding of Nb_(3)Sn’s superconducting mechanism under high pressure but also opens new avenues for its application in advanced superconducting technologies.

关键词： Superconductivity High pressure Nb_(3)Sn

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Effect of Sb-induced oxygen octahedral distortion on piezoelectric performance and thermal stability of Pb(In,Nb)O_(3)-Pb(Hf,Ti)O_(3)ceramics

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Journal of Materials science & technology 2023年第30期161卷 101-110页

作者： Huanli Shi Mo Zhao Dongyan Zhang Zhimin Li Maolin Zhang Jingya Wang Li Jin Yangxi Yan School of Advanced Materials and Nanotechnology Xidian UniversityXi’an 710071China National Ceramic Industry Design Institute of China Quanzhou 362500China Electronic Materials Research Laboratory Key Laboratory of the Ministry of EducationSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect(Northwest Institute of Nuclear Technology) Xi’an 710024China Shaanxi Applied Physics and Chemistry Research Institute Xi’an 710061China

The combination of excellent thermal stability and outstanding electrical performance is of great sig-nificance for piezoelectric ***,we have prepared 0.11Pb(In_(0.5)Nb_(0.5))O_(3)-0.89Pb(Hf_(0.47)Ti_(0.53))O_(3)-Sb_(2)O_(5)(PIN-PHT-x Sb)ceramics by solid-phase method and investigated the effect of oxygen octahedral lattice distortion on microstructure and macroscopic electrical *** distortion index of oxygen octahedra is studied by Rietveld refinement,showing that optimal octahedral distortion can soften B-O repulsion,disrupt long-range ordered ferroelectric domains,and enhance local heterogeneities,signifi-cantly increasing piezoelectric ***,outstanding thermal stability and ultrahigh piezo-electric response of PIN-PHT-1.2Sb ceramics are realized under the synergistic influence of octahedral distortion,excellent density,and large grain *** with PIN-PHT ceramics,PIN-PHT-1.2Sb ce-ramics exhibit ultrahigh piezoelectric responses(d_(33)=706 pC/N,k_(p)=0.68,ε_(r)=3244),a high Curie temperature(T C)of 300℃,excellent thermal stability,and anti-fatigue properties.

关键词： Oxygen octahedron Piezoelectric response Thermal stability

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Research on in situ generation mechanism and tribological properties of superhard high entropy ceramic coatings by high speed laser cladding

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Ceramics International 2025年

作者： Liu, Jin Shao, Qizhe Cui, Xiufang Jin, Guo Wen, Xin Shi, Taoyi Tian, Haoliang Institute of Surface/Interface Science and Technology Key Laboratory of Superlight Material and Surface Technology of Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Materials AECC Beijing Institute of Aeronautical Materials Beijing100095 China

The superhard high entropy ceramics coating was prepared in situ on surface of titanium alloys by high speed laser cladding with ZrB2, TiB2, NbB2, MoB2, and TaB2 as the original powder. The composition and generation mechanism of phases of coating were analyzed. The results showed that two phases were generated in situ during high speed laser cladding. On the one hand, the in situ reaction between melted ceramic powder and Ti element generated a high entropy monoboride ceramic (Zr, Ti, Nb, Mo, Ta)B with CrB-like structure. On the other hand, the substitution reaction between melted ceramic powders generated high entropy diborides (Zr, Ti, Nb, Mo, Ta)B2 with hexagonal structure. The coating exhibited high hardness (1931.4 HV0.5) and excellent tribological properties. The abrasive and adhesive wear phenomena of the coating are significantly reduced compared to the substrate, and the wear rate of the coating is less than 1/5 of that of the *** is attributed to dense microstructure and significant lattice distortion effect of the high entropy material. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Titanium alloys

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Effect of Oblique Laser Shock Peening on Fretting Fatigue of FGH95 Powder Superalloy 6

Effect of Oblique Laser Shock Peening on Fretting Fatigue of...

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2024 6th International Conference on advanced Materials and Ecological Environment, AMEE 2024

作者： Qu, Xiangming Wang, Wenjun Zhao, Yanyun Cao, Jun Zhu, Haiyan Guo, Xiaojun Wang, Xu Zhang, Yongkang College of Mechanical Engineering Hunan Institute of Science and Technology Yueyang Hunan China Guangdong Provincial Key Laboratory of Advanced Manufacturing Technology of Marine Energy Equipment Guangdong University of Technology Guangdong Guangzhou China Foshan Yuantian Mattress Machinery Co. Ltd Guangdong Foshan China AECC Hunan Aviation Powerplant Research Institute Hunan Zhuzhou China

Due to the high-frequency vibration contact of blade tenon, the contact surface of the mortise surface of the turbine disk is prone to fretting wear and fatigue fracture. The effects of shock times of Oblique Laser Shock Peening (LSP) and temperature on the fretting fatigue properties were studied. The fretting fatigue life of Oblique LSP treated samples at room temperature could be increased by 103.0%;At high temperatures, the fretting fatigue life could be increased by 68.5%. Through the analysis of fracture morphology, the fracture developing zone of fretting fatigue and tensile fatigue samples were compared. It is revealed that the wear in the transverse contact pads would promote the initiation of fatigue cracks;Due to the compressive force of the transverse contact pads, the degree of plastic deformation of the fretting specimens would increase, the quasi-cleavage facets appeared, and the tear ridge characteristics were obvious. The results of this paper provide a reference for the Oblique LSP of the FGH95 powder superalloy turbine disk and other aero-engine parts. © Published under licence by IOP Publishing Ltd.

关键词： Fracture

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EPIMR:Prediction of Enhancer-Promoter Interactions by Multi-Scale ResNet on Image Representation

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Big Data Mining and Analytics 2024年第3期7卷 668-681页

作者： Qiaozhen Meng Yinuo Lyu Xiaoqing Peng Junhai Xu Jijun Tang Fei Guo School of Computer Science and Technology College of Intelligence and ComputingTianjin UniversityTianjin 300350China Aeronautical Information Service Center of the Civil Aviation Administration of China(AISC.ATMB.CAAC) Beijing 100015China Center for Medical Genetics&Hunan Key Laboratory of Medical Genetics School of Life SciencesCentral South UniversityChangsha 410038China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518000China School of Computer Science and Engineering Central South UniversityChangsha 410083China

Prediction of enhancer-promoter interactions(EPIs)is key to regulating gene expression and diagnosing genetic *** to limited resolution,biological experiments perform not as well as expected while precisely identifying specific interactions,giving rise to computational biology *** EPI predictors have been developed,but their prediction accuracy still needs to be ***,we design a new model named EPIMR to identify enhancer-promoter ***,Hilbert Curve is utilized to represent sequences to images to preserve the position and spatial ***,a multi-scale residual neural network(ResNet)is used to learn the distinguishing features of different abstraction ***,matching heuristics are adopted to concatenate the learned features of enhancers and promoters,which pays attention to their potential interaction *** results on six cell lines indicate that EPIMR performs better than existing methods,with higher area under the precision-recall curve(AUPR)and area under the receiver operating characteristic(AUROC)results on benchmark and under-sampling ***,our model is pre-trained on all cell lines,which improves not only the transferability of cross-cell line prediction,but also cell line-specific prediction *** conclusion,our method serves as a valuable technical tool for predicting enhancer-promoter interactions,contributing to the understanding of gene transcription *** code and results are available at https://***/guofei-tju/EPIMR.

关键词： enhancer-promoter interactions Hilbert Curve multi-scale residual neural network(ResNet)

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Optimization of Li-ion Battery Charge and Discharge Model Based on Genetic Algorithm 14th

Optimization of Li-ion Battery Charge and Discharge Model Ba...

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14th International Conference on Genetic and Evolutionary Computing, ICGEC 2021

作者： Li, Xiang Yang, Wen Wang, Huan Chang, Xiaopeng Dang, Rongxin Wang, Dejun Key Laboratory of Materials Design and Quantum Simulation College of Science Changchun University Changchun130022 China Key Laboratory of Advanced Structural Materials Ministry of Education & Advanced Institute of Materials Science Changchun University of Technology Changchun130012 China

ISBN: (纸本)9789811684296

In this paper, a strategy using genetic algorithm to optimize the charging process of lithium-ion batteries is proposed, which is based on the coupling of computer optimization algorithm and battery charging model. Visual Studio 2010 is used for programming, and COMSOL Multiphysics 5.5 is used to establish an electrochemical model of the battery to simulate various processes in the battery to verify the reliability and accuracy of the design algorithm. The genetic algorithm can be used to find the suitable charging current, and the optimization can be picked in a large number of databases by using the optimal strategy to reduce the time complexity. By comparing the battery's discharge curve and SOC result, it is found that the battery using genetic algorithm and intelligent optimization is better than that using the traditional constant current and constant voltage charging algorithm in charging time, cycle life, charging efficiency and other performance indicators. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Genetic algorithms

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A Staged Strategy for MMC Offshore Converter Station Under Asymmetric AC Fault 7

A Staged Strategy for MMC Offshore Converter Station Under A...

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7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Li, Fangyuan Kou, Longze Zhou, Jiapei Hao, Jie State Key Laboratory of Advanced Power Transmission Technology Beijing China Beijing Key Laboratory of Dc Grid Technology & Simulation State Grid Smart Grid Research Institute CO.LTD. Beijing China State Grid Shanxi Electric Power Company Electric Power Science Research Institute Shanxi China

ISBN: (纸本)9798350345094

At present, offshore wind power has become an important development direction for wind power generation. Offshore wind farms often use high-voltage direct current transmission technology with modular multi-level voltage source converters (MMC-HVDC) to transmit electricity to the grid. However, the fault response characteristics of offshore wind farms through the MMC-HVDC transmission system are different from those through AC transmission way. Therefore, it is significant that studying the fault ride through (FRT) technology of offshore wind farms through the MMC-HVDC grid connection system for practical engineering. An electromagnetic transient simulation model for an offshore wind farm composed of a direct drive permanent magnet synchronous generator (D-PMSG) connected to the grid is established through MMC-HVDC transmission technology. The mechanism and suppression strategy of overvoltage generation in the transmission network are provided during the fault clearance and recovery phase of the offshore wind farm HVDC transmission system under AC asymmetric faults. A two-stage improved control strategy for MMC-HVDC offshore converter station in response to asymmetric faults has been proposed, which is beneficial for the joint system to quickly recover from the post fault system voltage and suppress the overvoltage risk during the fault clearing phase. Finally, the proposed strategy is validated based on a domestic ± 500kV project in China, demonstrating its effectiveness. © 2023 IEEE.

关键词： Offshore wind farms

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Multi-View Subspace Clustering Via Simultaneously Cycle Projection and Similarity Learning

Multi-View Subspace Clustering Via Simultaneously Cycle Proj...

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International Conference on Wavelet Active Media technology and Information Processing (ICWAMTIP)

作者： Xiang Tao Liu Jie Qiao Wenshen Xiao Siying Ye Mao National Key Laboratory of Complex Aviation System Simulation Southwest China Institute of Electronic Technology Chengdu China University of Electronic Science and Technology of China Chengdu China

ISBN: (数字)9798331519254

ISBN: (纸本)9798331519261

At present, most of the existing methods combine the data from different views mechanically to obtain the latent subspace with complementary information, which not only fails to make full use of the data information from specific perspectives but also brings redundancy. Therefore, we propose a novel multi-view subspace clustering method. It utilizes cycle projection to obtain a subspace construction model. At the same time, by learning the global structure and local manifold structure of this subspace while assigning learnable weights to different views, the consensus information among views and specific information from different views are captured according to the importance of different views. In this way, our method effectively reduces the original noise and redundancy, and further carries out the improvement of complementarity and consistency among views. The proposed method is optimized by using the Augmented Lagrangian Multiplier with Alternating Direction Minimization (ALM- ADM) algorithm. Experiment results on benchmark datasets confirm the effectiveness of our method.

关键词： Manifolds Technological innovation Clustering methods Redundancy Noise Clustering algorithms Information processing Media Minimization Similarity learning

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Satellite Interference Signal Classification Using Improved MLP Model

Satellite Interference Signal Classification Using Improved ...

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2022 IEEE International Conference on Unmanned Systems, ICUS 2022

作者： Xie, Liwei Zhuang, Yaqiang Zhuang, Xuebin Zeng, Xiaohui School of Systems Science and Engineering Sun Yat-Sen University Guangzhou China School of Integrated Circuits and Electronics Beijing Institute of Technology Beijing Key Laboratory of Millimeter Wave and Terahertz Technology Beijing China Science and Technology On Complex Aviation Systems Simulation Laboratory Beijing China

ISBN: (数字)9781665484565

ISBN: (纸本)9781665484565

In response to the existing style of deceptive jamming of Global Position System (GPS) receivers by aerial jammer carriers, a method using improved multi-layer perceptron (MLP) model is proposed to identify and classify interference sources based on the rate of change of satellite incoming angle. The work firstly constructs an airborne GPS interference source localization deployment model, then analyzes and verifies the rationality of this simulation data model, and finally emphasizes the superiority of the proposed method using the classical classification algorithm as a comparison method. The simulation results indicated that the proposed method is capable to identify the corresponding interferers with a greater rate of recognition compared with other method in the built multi-interference source environment, which provides a reference for dealing with the interference identification and classification in the networked GPS interference source deployment environment. © 2022 IEEE.

关键词： Antennas

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