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SSRN 2023年

作者： Zhu, Bin Mei, Yongqi Pei, Junsen Wang, Zijian Zhang, Yisheng State Key Lab of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Hubei Wuhan430074 China School of Iron and Steel Soochow University Suzhou215006 China

For the enhanced strength and ductility requirement, medium manganese steel is viewed as a new material to improve the crashworthiness and lightweight of vehicles. However, it is difficult to predict the microstructure and mechanical properties of medium manganese steel parts after forming due to the TRIP (Transformation Induced Plasticity) effect. Therefore, the Barkhausen noise (MBN) detection is used to research the mechanism of TRIP effect on the medium manganese steel, which will help to develop a non-destructive testing method for the microstructure and mechanical properties of medium manganese steel parts. By comparing the variation rule of the MBN peak value of medium manganese steel and dual-phase steel DP1180 during the tensile process,it is found that the peak value of MBN signals increase continuously after the medium manganese steel is yielded due to the TRIP effect;Based on the O-C model, the stress-induced martensite transformation is considered, and a new strain-transformation model is proposed to calculate the martensite content of medium manganese steel in all stages of elasticity and plasticity. Combined with the detection data onto MBN signal during the tensile process of medium manganese steel and the new strain-phase transformation model, an MBN nondestructive testing method for the martensite content of medium manganese steel is established and compared with the traditional XRD test method. For the martensite content of the corner of medium manganese steel U-shaped parts after stamping, the results showed the error between the MBN testing method (6.56%, 9.94%) and the XRD testing method (7.42%, 9.26%) is less than 12%. © 2023, The Authors. All rights reserved.

关键词： Tensile testing

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Improvement of Magnetic Properties and Hardness by Doing Mo to a Medium Entropy Alloy

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SSRN 2023年

作者： Xiang, Zhaolong Wang, Engang Wang, Tao An, Bailing Xin, Yan Lu, Jun Niu, Rongmei Han, Ke Li, Xi Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming Shanghai Jiao Tong University Shanghai200240 China National High Magnetic Field Laboratory Florida State University TallahasseeFL32310 United States Northeastern University Shenyang110819 China State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan430074 China

In most technologies for improving material properties, the enhancement of one type of properties usually leads to the degradation of other properties. In this study, we demonstrated that we were able to simultaneously improve hardness, coercivity, and remanence by doping a FeCrCo Medium Entropy Alloy (MEA) with Mo in order to engineer the α→α1 + α2 spinodal decomposition of the MEA. Scanning Transmission Electron Microscopy (STEM) demonstrated that, in samples doped with Mo, decomposition led to an increase in the volume fraction of the α1 phase. Decomposition also led to an enhancement in the composition gap between the α1 and α2 phases, as well as to greater and greater lattice mismatch between the two phases at each stage of decomposition. Our first-principles calculations and Magnetic Force Microscopy (MFM) showed that the saturation magnetization gap between the α1 and α2 phases gradually increased, while the size of the magnetic domain decreased. Despite the fact that the magnetic moment of Mo atom was antiparallel to those of Co and Fe atoms in both α1 and α(according to first-principles calculations), Mo doping actually enhanced rather than diminished the magnetic properties of FeCrCo MEA while at the same time also increasing hardness. © 2023, The Authors. All rights reserved.

关键词： Spinodal decomposition

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Study on Constitutive Model and Fracture Criterion of 7075 Aluminum Alloy at High Temperature

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SSRN 2023年

作者： Wang, Zijian Zhang, Xiaolei Gui, Jiangtao Geng, Huicheng Xiang, Chongchen Ding, Hanlin School of Iron and Steel Soochow University Suzhou215137 China Yangtze Delta Region Institute of Advanced Materials Suzhou215000 China State Key Lab of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan430074 China

Hot stamping has been widely used to solve the problems of spring back and cracking of aluminum alloy after cold forming. However, sheets are prone to failures like wrinkling and cracking during hot forming. Therefore, it is particularly important to establish a correct material model that can accurately reflect the deformation and fracture of the material. In this study, Tensile tests were conducted on the specimens at different temperatures, and Digital Image Correlation (DIC) was employed to obtain the specimen strain. The Yld2000-3d anisotropic yield criterion and the DF2014 fracture criterion were calibrated based on experiments and modeling, which were then used to characterize the anisotropy and fracture behavior of 7075 aluminum alloy, respectively. The specimens were also observed for fracture surface morphology. As the experiments and simulation results revealed, the 7075 aluminum alloy still had a more pronounced anisotropy at high temperatures. Finite element simulation was performed to obtain the parameters of the DF2014 fracture model at different temperatures. The results showed that the DF2014 fracture model could accurately predict the fracture behavior of the aluminum alloy. The specimens exhibited brittle fracture at room temperature, while the behavior changed to typical ductile fracture as the temperature rose. © 2023, The Authors. All rights reserved.

关键词： Anisotropy

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simulation Analysis of Transmission Wire Breeze Vibration

Simulation Analysis of Transmission Wire Breeze Vibration

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Power and Energy Engineering (ICPEE), International Conference on

作者： Liu Qi Fu Chujun Yilin Wang Zhao Jianli Wang Yingjie Inner Mongolia Power Research Institute Branch Inner Mongolia Power (Group) Co. LTD. Hohhot China State Key Lab of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665464765

For the typical anti vibration device, the anti vibration hammer and damping line are modeled and analyzed. The energy balance method is used to analyze the principle of aeolian vibration of transmission lines and the anti vibration effects of different anti vibration devices. The influence of installing damper and damping wire on the amplitude of aeolian vibration of grounding wires is studied. The finite element models of the two devices are established. The modal analysis method is used to calculate their natural frequencies and vibration modes, and the reliability of the finite element model of the anti vibration device is verified. After mastering the model and simulation method of the transmission line breeze vibration system, the effect of installing different types, quantities and combination modes of anti vibration devices in the system is compared and analyzed, and it is found that the combination model has absolute advantages. This paper studies and verifies the modeling and simulation method of transmission line breeze vibration, and verifies the effectiveness of the anti vibration method through an example.

关键词： Vibrations Damping Analytical models Power transmission lines Modal analysis Wires Mathematical models

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A Review on Discrete Element Method simulation in Laser Powder Bed Fusion Additive Manufacturing

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2022年第1期1卷 70-82页

作者： Hui Chen Yajing Sun Weihao Yuan Shengyong Pang Wentao Yan Yusheng Shi State Key Lab of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore Department of Mechanical Manufacturing and Biomedical EngineeringTrinity College Dublinthe University of DublinDublin 2Ireland

Laser powder bed fusion(LPBF)is a popular metal additive manufacturing ***,the materials employed for LPBF are discrete and particulate metal ***,the discontinuous behaviors exhibited by the powder materials cannot be simulated solely using conventional continuum-based computational approaches,such as finite-element or finite-difference *** discrete element method(DEM)is a proven numerical method to model discrete matter,such as powder particles,by tracking the motion and temperature of individual ***,DEM simulation has gained popularity in LPBF ***,it has not been widely *** study reviews the existing applications of DEM in LPBF processing,such as powder spreading and fusion.A review of the existing literature indicates that DEM is a promising approach in the study of the kinetic and thermal fluid behaviors of powder particles in LPBF additive manufacturing.

关键词： Laser powder bed fusion Discrete element method Additive manufacturing Modelling Numerical simulation

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Theoretical Calculation and Finite Element simulation of Third Order Vibration Modes of Transmission Line and Tower System

Theoretical Calculation and Finite Element Simulation of Thi...

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Power and Energy Engineering (ICPEE), International Conference on

作者： Lei Wang Ning Dang Jie Bai Yilin Wang Siqi Zheng Shun Zhao Haonan Guo Jianli Zhao Inner Mongolia Power (Group) Co. Ltd. Inner Mongolia Power Research Institute Branch Hohhot China State Key Lab of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665464765

Wind induced disasters cause conductor strand breakage, wire breakage, hardware damage, interphase short circuit, pole breakage, pole reversal and other accidents of overhead transmission lines. This seriously threatens the safe operation of transmission lines. In order to study the cause and mechanism of wind induced vibration of transmission lines and prevent wind induced disasters of transmission lines. Taking JL/G1A-400/35 transmission line as an example, this paper constructs the vibration differential equation of transmission line, and solves the natural frequency of the line through the equation. In addition, the finite element simulation method is used to build the geometric model of the transmission line, and the natural frequency of the line is calculated through modal analysis. By comparing the results of differential equation method and finite element simulation method, it can be found that the calculated natural frequencies are almost the same, and the third-order errors do not exceed 5%, which proves that the calculation of finite element simulation method is reasonable and reliable. In addition, the tower is added to the finite element model of the transmission line to analyze the vibration mode and natural frequency of the system. The simulation results show that the elastic boundary conditions of the tower will reduce the natural frequency of the transmission line. With the increase of vibration frequency order, the influence of iron tower on the natural frequency of transmission line is greater.

关键词： Vibrations Analytical models Power transmission lines simulation Poles and towers Geometric modeling Differential equations

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Pressure Effects in the Unusual-Caged Dynamics of La80al20 Metallic Glass-forming Liquid

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SSRN 2022年

作者： Chen, Yuxuan Feng, Shidong Lu, Xiaoqian Zhang, Yanhui Li, Zijing Ngai, K.L. Wang, Limin State Key Laboratory of Metastable Materials Science and Technology College of Materials Science and Engineering Yanshan University Qinhuangdao066004 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology 1037 Luoyu Road Wuhan430074 China Key Lab for Microstructural Material Physics of Hebei Province School of Science Yanshan University Hebei Qinhuangdao066004 China CNR-IPCF Università di Pisa PisaI-56127 Italy

Caged dynamics is the precursor of β-relaxation and is part of the complex relaxation dynamics of metallic glasses. However, limited by the lack of suitable experimental instruments, the pressure dependence of the caged dynamics of glass-forming (GF) liquids and its underlying mechanism is still open to date. An unusual caged dynamics manifests a sudden drop near 0.1 ps in the partial non-Gaussian parameter of Al atoms in La-Al GF liquid. The present work investigates the caged dynamics of the model La80Al20GF liquid with strong atomic interactions under different pressures by molecular dynamics simulations. It is found that pressurization makes the atomic vibration frequency be fast and the vibrational amplitude tend to be consistent. In addition, the dominant polyhedra are transformed from the stable icosahedral-like polyhedra to the unstable ones that are compatible with crystal symmetry, which promotes the rearrangement of atoms. These in turn cause the central Al atoms to be less hindered by the surrounding atoms, enhancing the cage-breaking motion and weakening the unusual caged dynamics. These findings may provide new insights into the caged dynamics under pressure from the perspective of microstructure and vibrational behaviors. © 2022, The Authors. All rights reserved.

关键词： Glass

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Numerical and experimental study of effects of different flow channel structures on the performance of solid oxide fuel cell

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Journal of Power Sources 2025年 652卷

作者： Guangyu Li Yingfa Tian Jie Wang Bo Liu Lichao Jia Jian Li Dong Yan School of Materials Science and Engineering State Key Lab of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology 1037 LuoYu Road Wuhan 430074 China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen 518000 China

Providing uniformed gas supply is a widely accepted method in solid oxide fuel cell stack design to achieve better performance. In this study, we follow this method to improve the gas feeding system of an asymmetrical one-cell stack by employing multi-physics numerical simulation. The flow simulation demonstrates that the symmetrical feeding channel modification successfully improves gas distribution uniformity, but the asymmetrical stack outperforms the symmetrical one. The simulation results reveal multiple reasons. There exists local mismatch in gas concentrations in the symmetric structure, which will lead to a decrease in gas velocity within the electrodes, reducing mass transfer efficiency and increasing overpotential. These effects extend to the thermal distribution, causing an increase in peak temperature and uneven temperature distribution. The study highlights a key design insight, suggesting that the optimal solid oxide fuel cells structural design may require intentional flow asymmetry to achieve the desired performance characteristics.

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Multi-Objective Optimization for High-Performance Fe-Based Metallic Glasses Via Machine Learning Approach

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SSRN 2023年

作者： Zhang, Yu-Xing Xie, She-Juan Guo, Wei Ding, Jun Poh, Leong Hien Sha, Zhen-Dong State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Engineering Xi'an Jiaotong University Xi'An710049 China China Electronics Technology Group Corporation 52nd Research Institute Hang’zhou310000 China State Key Lab of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology 1037 Luoyu Road Wuhan430074 China Center for Alloy Innovation and Design State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi'An710049 China Department of Civil and Environmental Engineering National University of Singapore 1 Engineering Drive 2 E1A-07–03 Singapore117576 Singapore International Center for Applied Mechanics China

Fe-based metallic glasses (MGs) are a class of promising soft magnetic materials that have received great attention in transformer industries. However, their limited glass-forming ability and poor plasticity severely hinder the development of new high-performance Fe-based MGs. Inspired by the significant development in machine learning (ML) technology, we herein propose a multi-objective optimization strategy to search for Fe-based MGs with optimal combinations of critical casting size (Dmax), saturation magnetization (Bs), and plasticity. The objective functions are built in combination with neural network (NN) models for predicting Dmax and Bs, as well as empirical formula for plasticity. The effect of number of hidden layers is investigated and the dropout regularization method employed to improve the prediction performance. Our results show that the predictions of Bs and Dmax by using alloy composition as the sole input perform well, as evidenced by their r2 values of 0.963 and 0.874, respectively. Multi-objective optimization based on the genetic algorithm is executed to obtain the Pareto front and Pareto-optimal solutions. The Pareto-optimal alloys predicted for the Fe83C1B x Si y P16- x-y and Fe x Co y Ni72 -x-y B19.2Si4.8Nb4 systems are in good agreement with those reported in experiments. This work thus showcases potential applications for the design of high-performance Fe-MGs against conflicting objectives. © 2023, The Authors. All rights reserved.

关键词： Saturation magnetization

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Sensitivity simulation Analysis of Influencing Factors of Resonance Frequency of FDN Anti-vibration Hammer

Sensitivity Simulation Analysis of Influencing Factors of Re...

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Power and Energy Engineering (ICPEE), International Conference on

作者： Jianli Zhao Xin Wen Yilin Wang Ning Dang Inner Mongolia Power (Group) Co. Ltd. Inner Mongolia Power Research Institute Branch Hohhot China State Key Lab of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan China Inner Mongolia Power (Group) Co. Ltd. Hohhot Power Supply Bureau Hohhot China

ISBN: (纸本)9781665464765

Gale weather conditions always test the safety of the line, often lead to transmission line fatigue broken, or even broken phenomenon, can cause serious accidents. Therefore, in order to study the suppression of wind-induced vibration of conductors and ensure the stable operation of lines, this paper takes FDN type anti-vibration hammer as the research object, solves the vibration differential equation of anti-vibration hammer, and obtains the vibration mode and natural frequency of anti-vibration hammer. The ANSYS finite element method is used to model, and the natural frequency and vibration mode are calculated by modal analysis method. The reliability of the finite element model of the damper is verified by comparing the calculated values of the two models.

关键词： Vibrations Analytical models Sensitivity Power transmission lines Resonant frequency Mathematical models Shock absorbers

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