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Effect of Ce content on mechanical properties of Ce/Cr coated open-cell Ni-Cr-Fe alloy foams

Transactions of Nonferrous Metals Society of China 2017年第5期27卷 1052-1062页

作者： Qiu PANG Zhi-li HU Guo-rong WANG School of Mechanical and Electrical Engineering Wuhan Donghu University Wuhan 430212 China Hubei Key Laboratory of Advanced Technology of Automobile Components Wuhan University of Technology Wuhan 430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China

The Ce/Cr coating was homogenously deposited onto the reticulated open-cell Ni?Cr?Fe alloy foam by the pack cementation *** mechanical properties of the Ce/Cr coated alloy foams were investigated by the quasi-static compression ***,the deformation and failure mechanisms of Ce/Cr coated alloy foams were *** results show that the adding amount of CeO2powders influences the mechanical properties of the Ce/Cr coated alloy *** an increase in density as compared to the uncoated foams,the Ce/Cr coated foams exhibit improvement in both yield strength and energy-absorption ***,the energy-absorption performance of2%Ce/Cr(mass fraction)coated alloy foam is averagely1.9times as high as that of the bare Ni?Cr?Fe alloy *** addition,the mechanical properties of the Ce/Cr coated alloy foams increase with the increase of strain *** distortion and cracking are mainly the deformation behavior of the Ce/Cr coated alloy foam,confirmed by SEM images.

关键词： nickel-based alloy foam mechanical properties yield stress plateau stress failure mechanism

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Numerical analysis of 3D spot continual induction hardening on curved surface of AISI 1045 steel

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Journal of Central South University 2016年第5期23卷 1152-1162页

作者：高恺汪舟秦训鹏朱生霄 Hubei Key Laboratory of Advanced Technology for Automotive Components (Wuhan University of Technology)

In order to investigate and predict the material properties of curved surface AISI 1045 steel component during spot continual induction hardening(SCIH),a 3D model for curved surface workpieces which coupled electromagnetic,temperature and phase transformation fields was built by finite element software ANSYS.A small size inductor and magnetizer were used in this model,which can move along the top surface of workpiece *** effect of inductor moving velocity and workpiece radius on temperature field was analyzed and the heating delay phenomenon was found through comparing the simulated *** temperature field results indicate that the heating delay phenomenon is more obvious under high inductor moving velocity *** trend becomes more obvious if the workpiece radius becomes *** predictions of microstructure and micro-hardness distribution were also carried out via this *** predicted results show that the inductor moving velocity is the dominated factor for the distribution of 100% martensite region and phase transformation *** influencing factor of workpiece radius on 100% martensite region and phase transformation region distribution is obvious under relatively high inductor moving velocity but inconspicuous under relatively low inductor moving velocity.

关键词： spot continual induction hardening curved surface heating delay phenomenon

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Influence of cutter diameter on meshing performance in spiral bevel gears

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Journal of Central South University 2016年第1期23卷 102-111页

作者：马志浩韩星会华林熊小双郑方焱 Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology

Playing a critical role in transmitting movement and power, the meshing performance of spiral bevel gears has a significant effect on products' operational performance. To evaluate the meshing performance, the accurate three-dimensional(3D) spiral bevel gear models are established through the Pro/E and MATLAB softwares, and the finite element analysis(FEA) methods are applied to the theoretical investigation of the influence of cutter diameter on meshing performance in spiral bevel gears. The results obtained show that the cutter diameter has a significant influence on spiral bevel gears' meshing performance, such as the contact area, contact pressure, bending stress, torsional stiffness and transmission error.

关键词： spiral bevel gears meshing performance finite element analysis cutter diameter

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Microscopic Reconstruction and Mechanical Simulation of Fuel Cell Gas Diffusion Layer

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Tongji Daxue Xuebao/Journal of Tongji University 2018年 46卷 201-206页

作者： Xiao, Liusheng Luo, Maji Liu, Guocun Zhang, Heng Leng, Wenliang Sui, Bangjie Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan430070 China

Stochastic reconstruction technique and the finite element method(FEM) were employed to investigate the stress and displacement distribution of proton exchange membrane fuel cell(PEMFC) gas diffusion layer(GDL) under compression at microscopic scale. Dynamic contact, friction motion and extrusion deformation were considered in the model. Microstructure of a gas diffusion layer was reconstructed first, and the stress and the displacement distribution of the microstructure in X, Y and Z direction with different compression rates were investigated. The effects of frictional coefficient and material parameters on the displacement distribution were examined. The simulation results show that the carbon fibers' displacement in the Z direction (through-plane) under compression is more noticeable, and some carbon fibers under the channel region even intrude into the gas channel. Most of the computed stress of the carbon fibers is lower than 100 kPa, with a maximum value of 1 063.7 kPa. It is found that material parameters of the carbon fibers have little influence on displacement distribution, but as the frictional coefficient increases, the displacement increases obviously. © 2018, Editorial Department of Journal of Tongji University. All right reserved.

关键词： Finite element method

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Techniques used to improve the tribological performance of the piston ring-cylinder liner contact

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IOP Conference Series: Materials Science and Engineering 2019年第2期563卷

作者： Ahmed Elagouz Mohamed Kamal Ahmed Ali Hou Xianjun Mohamed A. A. Abdelkareem Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan 430070 China. Automotive and Tractors Engineering Department Faculty of Engineering Minia University El-Minia 61111 Egypt. Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070 China.

The mechanical assemblies in automotive engines are usually lubricated by a combination of oil and solid lubrication films. Consequently, the significant current challenges for developing the tribological behavior of vehicle engines need the lubricants that conform to different operating conditions by providing mechanisms for reducing friction and wear. This article summarily reviews the techniques used to improve the tribological performance for piston ring-cylinder liner contact and evaluates their effectiveness to provide the most assuring approaches to reduce friction and wear. The objective was to explore the areas where there are openings for further research contributions to achieving an improvement in the piston ring-cylinder contact in automotive engines.

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The effect of dimethyl ether addition on sooting limits in non-premixed counterflow flames 11

The effect of dimethyl ether addition on sooting limits in n...

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11th Asia-Pacific Conference on Combustion, ASPACC 2017

作者： Li, Zepeng Wang, Yu Chung, Suk Ho Roberts, William L. Clean Combustion Research Center King Abdullah University of Science and Technology Thuwal Saudi Arabia Hubei Key Laboratory of Advanced Technology for Automotive Components School of Automotive Engineering Wuhan University of Technology Wuhan China

Regarded as one of the most promising alternative fuels, dimethyl ether (DME) plays a positive role in the reduction of combustion emissions, e.g., NOx, SOx, and soot particles. The effect of DME on the sooting limits was investigated systematically in counterflow diffusion flames of DME and ethylene mixtures. The primary technique conducted to rate sooting tendency was laser extinction and scattering. The critical fuel mole fraction (xf,cr) and critical oxygen mole fraction (xo,cr) at the point which soot started to appear in the elastic light scattering signal were recorded to evaluate sooting limits. In this work, the sooting limit map of ethylene/DME mixtures was developed based on the xf,cr and xo,cr. The highest sooting tendency appeared at around 6% of DME mixing ratio (β). When β>6%, the addition of DME decreases sooting propensity;to the contrary, when β © 2018 Combustion Institute. All Rights Reserved.

关键词： Ethers

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Welding Thermal Simulation and Metallurgical Characteristics Analysis in WAAM for 5CrNiMo Hot Forging Die Remanufacturing

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Procedia Engineering 2017年 207卷 2203-2208页

作者： Zeqi Hu Xunpeng Qin Tan Shao Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan 430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070 China

In order to analyze the performance of wire and arc additive manufacturing for 5CrNiMo hot forging die remanufacturing, the FEM numerical model of multi-layer and multi-pass welding was built. The thermal distribution and cycle in weld beads were investigated, and the simulation results conformed to the experimental measurements well. Then the microstructure and micro-hardness in different layers and the heat affected zone in the substrate was analyzed after the experiment of weld overlaying, and the influence of the thermal cycle on the metallurgical characteristics was also discussed. The results showed that the beads were affected by the preheating and the reheating of the previous and subsequent overlaying, and the grain size of the microstructure increased with the height of layers, while the micro-hardness decreased. Additionally, the difference of the structure between the adjacent layers was greater than that in the same layer.

关键词： 5CrNiMo WAAM die remanufacturing thermal cycle Metallurgical characteristics

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In situ constructing of ultrastable ceramic@graphene core-shell architectures as advanced metal catalyst supports toward oxygen reduction

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Journal of Energy Chemistry 2017年第6期26卷 1160-1167页

作者： HuiWu Tao Peng Zongkui Kou Kun Cheng Jie Zhang Jian Zhang Tian Meng Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina GAC New Energy Automobile Co. Ltd.Guangzhou 511400GuangdongChina

The changeable structure of 2 D graphene nanosheets makes the Pt-based nanoparticles（NPs） possess a low efficiency toward oxygen reduction reaction（ORR） and a short lifetime for proton exchange membrane fuel cells. Thus, a unique Ti C@graphene core-shell structure material with low surface energy is designed and prepared by an in situ forming strategy, and firstly applied as a stable support of Pt *** as-prepared Pt/GNS@Ti C catalyst presents a high activity. Especially, its ORR stability is remarkably improved. Even after 15000 potential cycles, the half-wave potential and mass activity toward ORR have almost no change. This can be attributed to that the graphene nanosheet existing in a sphere shape effectively avoids the restacking or folding caused by the giant surface tension in 2 D graphene nanosheets,impeding the decrease of the triple-phase boundary on Pt NPs. Significantly, the power density of fuel cells with our novel catalyst reaches 853 m V cmunder a low Pt loading(0.25 mg Pt cm) and H/Air conditions. These indicate the new ceramic@graphene core-shell nanocomposite is a promising application in fuel cells and other fields.

关键词： Graphene Core-shell Oxygen reduction Electrocatalyst Stability PEM fuel cell

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Fuzzy-PID Control for Electric Power Steering

Fuzzy-PID Control for Electric Power Steering

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2017 2nd International Conference on Mechatronics, Control and Automation Engineering (MCAE2017)

作者： Van-Giao NGUYEN Xue-xun GUO Cheng-cai ZHANG Ci CHEN School of Automotive Engineering Wuhan University of Technology Hubei Key Laboratory of Advanced Technology for Automotive Components Hubei Collaborative Innovation Center for Automotive Components Technology

This paper investigates and designs the fuzzy-PID controller for the Electrical Power Steering(EPS) system. Different from existing controller, in this paper, we establish the on-line fuzzy control rules to adjust the PID parameters. The fuzzy control rules are designed based on the practical conditions and the expert experience. Therefore, this control strategy can overcome the traditional PID controllers. The main advantage of the proposed control algorithm has able the adaptive of control parameters, which will greatly improve the stability of EPS system. Therefore, our fuzzy-PID controller improves significantly the steering maneuverability and steering wheel return ability. In addition, our control strategy improves system performance and robustness. Finally, based on Matlab/Simulink, the simulation model with CarS im is established to demonstrate the effectiveness of proposed controller.

关键词： Electric Power Steering Fuzzy-PID Return-to-center Co-simulation technique

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Failure Mechanisms and Structural Optimization of Shredder Hammer for Metal Scraps

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Chinese Journal of Mechanical Engineering 2016年第4期29卷 792-801页

作者： ZHOU Xianyan HU Zhili TAO Yijun QIN Xunpeng HUA Lin Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan 430070 China Hubei Lidi Machine Tool Company Limited Yichang 443000 China

Recycling retired cars can relieve the environmental pollution and resource waste ***,a few publications can be found on the failure mechanisms and optimization method of recycling equipment,***,the failure mechanisms and structural optimization of shredder hammers for retired cars are studied aiming improving shredding efficiency and reducing *** types of shredder hammer are studied theoretically,and it is found that wear failure and fatigue failure are the two main failure types of shredder *** shredding process of metal scraps is analyzed by finite element method,and it can be divided into four stages based on the stress states：initial stage,collision stage,grinding stage and separation *** is proved that the shredding efficiency can be improved by increasing cutouts on the hammer ***,it is determined that the hammer with two cutouts is the optimal structure for metal scraps,which can improve the shredding efficiency by 20% and lengthen the hammer life by 15%.This study provides scientific basis for the industry application and theoretical foundation for further research.

关键词： Metal scraps recycling impacts grinding structural optimization

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