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Atomic simulation of size effect and surface properties of aluminum nanoparticles

2013 2nd International Conference on Sport Material, Modelling and simulation, ICSMMS 2013

作者： Zhu, Wei Song, Wulin Wang, Jianjun State Key Lab of Materials Forming Simulation and Die and Mould Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9783037856635

Here, modified analytic embedded atom method (MAEAM) has been utilized to simulate size effect and surface properties of aluminum (Al) nanoparticles. According to the simulation results, we can find that lattice parameter and excess stored energy are size dependent. The simulated excess stored energy ranges from 2.12 to 57.61 kJ/mol, which is in the same order of magnitude with experiment results;surface energy of Al nanoparticles ranges from 0.78 to 1.10 J/m2, which is not invariant but size related. Furthermore, non-uniform lattice distortion has been observed in Al nanoparticles, and mainly concentrates in the first and second shell of surface layers. Theoretical research based on our simulation results provides a novel method to predict excess stored energy of metallic nanoparticles. © (2013) Trans Tech Publications, Switzerland.

关键词： Molecular dynamics

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Atomic simulation of Size Effect and Surface Properties of Aluminum Nanoparticles

Atomic Simulation of Size Effect and Surface Properties of A...

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2013 International Conference on Sport Material,Modelling and simulation(ICSMMS 2013)

作者： Wei Zhu Wulin Song Jianjun Wang State Key Lab of Materials Forming Simulation and Die and Mould Technology Huazhong University of Science and Technology

Here, modified analytic embedded atom method(MAEAM) has been utilized to simulate size effect and surface properties of aluminum(Al) nanoparticles. According to the simulation results, we can find that lattice parameter and excess stored energy are size dependent. The simulated excess stored energy ranges from 2.12 to 57.61 k J/mol, which is in the same order of magnitude with experiment results;surface energy of Al nanoparticles ranges from 0.78 to 1.10 J/m2, which is not invariant but size related. Furthermore, non-uniform lattice distortion has been observed in Al nanoparticles, and mainly concentrates in the first and second shell of surface layers. Theoretical research based on our simulation results provides a novel method to predict excess stored energy of metallic nanoparticles.

关键词： Molecular dynamics simulation Size effect Surface energy Non-uniform lattice distortion Excess stored energy Aluminum nanoparticles

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Finite Element Analysis on the Injection Molding and Productivity of Conformal Cooling Channel

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Journal of Shanghai Jiaotong university(Science) 2011年第2期16卷 231-235页

作者：郑重张海鸥王桂兰钱应平 State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology Huazhong University of Science and Technology Mechanical Engineering College Hubei University of Technology

The study proves that the conformal cooling channel can overcome the disadvantages of the conventional cooling channel resulting from the limitation in complicated *** simulation analyses of the fragrance lamp with different cooling layouts show that the conformal cooling channel can offer a more uniform heat dissipation,lower volume shrinkage and shorter time to freeze than the conventional channel,which indicates significantly improvements in productivity and quality.

关键词： conformal cooling channel injection mould cooling simulation

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The Optimization Design Study of Selective Laser Sintering Process Parameters on the Pro-Coated Sand Mold

The Optimization Design Study of Selective Laser Sintering P...

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The International Conference on Recent Trends in Materials and Mechanical Engineering (ICRTMME 2011)

作者： Rong Cheng Xiaoyu Wu Jianping Zheng College of Mechatronics and Control Engineering Shenzhen University State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology School of Material Science and EngineeringHuazhong University of Science and Technology

This paper presents experimental investigations on influence of important process parameters viz.,laser power,scan speed,layer thickness,hatching space along with their interactions on dimensional accuracy of Selective Laser Sintering(SLS) processed pro-coated sand *** is observed that dimensional error is dominant along length and width direction of built *** parameters setting to minimize percentage change in length and width of standard test specimen have been found out using Taguchi's parameter *** process conditions are obtained by analysis of variance(ANOVA) is used to understand the significance of process variables affecting dimension *** speed and hatching space are found to be most significant process variables influencing the dimension accuracy in length and *** laser power and layer thickness are less influence on the dimension *** optimum processing parameters are attained in this paper: laser power 11 W;scan speed 1200 mm/s;layer thickness 0.5 mm and hatching space 0.25 *** has been shown that,on average,the dimensional accuracy under this processing parameters combination could be improved by approximately up to 25% compared to other processing parameters combinations.

关键词： Selective Laser Sintering(SLS) casting sand mould dimension accuracy Taguchi method

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Microstructure and shear strength of the brazed joint of Ti(C,N)-based cermet to steel

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Rare Metals 2010年第1期29卷 72-77页

作者： YE Dameng, XIONG Weihao, Zhang Xiuhai, QU Jun, and YAO Zhenghua state key lab.ratory of plastic forming simulation and die & mould technology, Huazhong University of Science and technology, Wuhan 430074, China State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology Huazhong University of Science and Technology Wuhan China

Firm joins were obtained between Ti（C,N）-based cermet and steel with Ag-Cu-Zn-Ni filler metal by vacuum brazing. The effects of technological parameters such as brazing temperature, holding time, and filler thickness on the shear strength of the joints were investigated. The microstructure of welded area and the reaction products of the filler metal were examined by scanning electron microscopy （SEM）, metallographic microscope （OM）, energy-dispersive X-ray analysis （EDS）, and X-ray diffraction （XRD）. The brazing temperature of 870℃, holding time of 15 min, and filler thickness of 0.4 mm are a set of optimum technological parameters, under which the maximum shear strength of the joints, 176.5 MPa, is achieved. The results of microstructure show that the wettability of the filler metal on Ti（C,N）-based cermet and steel is well. A mutual solution layer and a diffusion layer exist between the welding base materials and the filler metal.

关键词： Ti（C,N）-based cermet vacuum brazing filler metal shear strength interface structure

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The Properties of an UV Curable Support Material Pre-polymer for Three Dimensional Printing

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Journal of Wuhan University of technology(Materials Science) 2010年第2期25卷 278-281页

作者：黄兵莫健华 State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology Huazhong University of Science & Technology

An ultraviolet（UV） curable support material pre-polymer for three dimensional printing was prepared based on the synergistic effect between PEO-PPO-PEO tri-block copolymer（F127） and polyethylene glycol （400） di-acrylate（SR344）. The effects of jetting conditions, thermal stability, curing time, mechanical properties and shrinking rate on printing models were studied. The situation of removing support material from build model was investigated after building progress was completed. The experimental result shows that when F127 is 6.0wt%, SR344 is 20.0wt%, 4-Methoxy phenol is 0.15wt% and Irgacure 2959 is 1.5wt%, the support material pre-polymer could be jetted out from the nozzles smoothly during building up of three dimensional printing models at 50-55 ℃. In addition, the support material could be removed easily from building model without spoiling the model; furthermore, the forming precision of building model is improved.

关键词： three dimensional printing support material synergistic effect forming precision

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Electromagnetic Levitation Confined Direct Metal Depostion:Theory,simulation and Experiment

Electromagnetic Levitation Confined Direct Metal Depostion:T...

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The 11th International Workshop on Plasma-Based Ion Implantation & Deposition(第11届等离子基离子注入与沉积国际会议)

作者： H.O.Zhang X.W.Bai G L.Wang State Key Laboratory of Digital Manufacturing Equipment & Technology Huazhong University of Science & Technology Wuhan 430074 PR China State Key Lab of Plastic Forming Simulation and Die & Mold Technology Huazhong University of Science & Technology Wuhan 430074 PR China

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Synthesis and photo-responsive behaviors of hollow polyazobenzene micro-spheres

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Chinese Science Bulletin 2010年第30期55卷 3441-3447页

作者： WANG XiaoTao YANG YingKui YANG ZhiFang LIAO YongGui ZHANG Wei XIE XiaoLin State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 China Faculty of Materials Science and Engineering Hubei University Wuhan 430062 China

By means of distillation precipitation polymerization,the silica-hybrid particles with polyazobenzene shell (PAzo@SiO2) microspheres were prepared with 6-(4-methoxy-4'-oxy-azobenzene) hexyl methacrylate (Azo-M) as monomer,divinylbenzene (DVB) as cross-linker,and ～250 nm vinylated sol-gel silica particles as template. Hollow polyazobenzene microspheres were further developed after selective removal of the silica cores with HF solution. When the content of DVB related to Azo-M is 20 wt%,the acetonitrile is 200 mL,and the polymerization time is 4.5 h,the hollow PAzo microspheres with about 20 nm shell are successfully fabricated. These hollow PAzo microspheres have excellent reversible photoisomerization,and their first-order rate constant of trans-cis isomerization only decreases 11.8% compared with homopolymer of azobenzene (Homo-PAzo).

关键词：空心微球光响应甲基丙烯酸甲酯行为合成二乙烯基苯顺反异构化偶氮苯

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Application of PC Based Galvanometric Scanner with Dynamic Focus in Rapid Prototyping

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Journal of Southwest Jiaotong University(English Edition) 2010年第1期18卷 65-70页

作者：文世峰史玉升蔡道生黄树槐 State Key Laboratory of Plastic Forming Simulation and Die and Mould Technology Huazhong University of Science and Technology

A galvanometric scanner with a dynamic focus was designed using a PC to realize the model transform of the image, calculate the interpolation points of the image, and implement the focus compensation of the dynamic focus system. The interrupt of PC was used for the real-time control. It was confirmed that the PC-based galvanometric scanner with dynamic focus could run more than 72 h stably, with an accuracy of 100 ±0.1 mm, and the period of real-time control was less than 20μs.

关键词： Galvanometric scanner Dynamic focus Image manipulation Real-time control

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Research and application of CAD/CAE system for the whole development cycle of automotive panel

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Cailiao Kexue yu Gongyi/Material Science and technology 2010年第4期18卷 494-498页

作者： Du, Ting Dai, Long-Ming Zhang, Zhi-Bing Liu, Yu-Qi State Key Laboratory of Plastic Forming Simulation and Die and Mould Technology Huazhong University of Science and Technology Wuhan 430074 China

To avoid the workload of data transferring between different CAD/CAE softwares which leads to data loss problem and iterative building of the analysis model, a seamlessly integrated parametric CAD/CAE system named FASTAMP-NX has been developed based on UGS NX platform. It includes two subsystems, IAW for the design of sheet metal parts and stamping dies and FAW for virtual tryout. With the unified parametric feature model and associated design technology, the integrated system can be applied to the whole process of the product design and die development to realize the real CAE-driven design process, which greatly improves the efficiency of design and analysis.

关键词： Computer aided design

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