期刊：
Journal of Alloys and Compounds,2017年690:108-115 ISSN：0925-8388
通讯作者：
Zhu, Hongmei;Kuang, Tongchun
作者机构：
[Tan, Chaolin; Zhu, Hongmei] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Kuang, Tongchun; Tan, Chaolin] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China.;[Tan, Chaolin] Guangdong Inst New Mat, Guangzhou 510651, Guangdong, Peoples R China.;[Liu, Hongwei; Shi, Jeffery; Liu, Zongwen] Univ Sydney, Sch Chem & Biomol Engn, Sydney, NSW 2006, Australia.
通讯机构：
[Zhu, Hongmei] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Kuang, Tongchun] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China.
关键词：
Exterior wall<&wdkj&>Coupled heat and moisture transfer<&wdkj&>Optimum insulation thickness<&wdkj&>Lifecycle total cost<&wdkj&>Lifecycle saving<&wdkj&>Payback period
期刊：
Journal of Physical Chemistry C,2014年118(8):4437-4443 ISSN：1932-7447
通讯作者：
Chen, Chunlin
作者机构：
[Fan, Xiangfang; Chen, Yong; Qiu, Changjun] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Chen, Chunlin; Lv, Shuhui; Wang, Zhongchang; Chen, Yong] Tohoku Univ, Adv Inst Mat Res, WPI Res Ctr, Aoba Ku, Sendai, Miyagi, Japan.;[Chen, Chunlin] Tohoku Univ, Adv Inst Mat Res, WPI Res Ctr, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi, Japan.
通讯机构：
[Chen, Chunlin] Tohoku Univ, Adv Inst Mat Res, WPI Res Ctr, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi, Japan.
摘要：
We investigate, by a systematic first-principles calculation, the surface energies of ceria {100} crystal planes with adsorption of 13 kinds of nonmetallic elements and nine kinds of metallic elements. We predict theoretically that adsorption of nonmetallic B, C, F, Si, P, S, Cl, Br, OH, and I and metallic Sr, La, Mg, Na, K, Y, Ca, and Ba can stabilize the ceria {100} planes through lowering their surface energies. Experimentally, we purposely select KOH as a mineralizing agent by taking into account the calculated surface energies and the factors in hydrothermal synthesis, and demonstrate a successful production of cube-shaped ceria nanoparticles of high purity via carefully optimizing the synthesis parameters. Further comprehensive transmission electron microscopy study identifies all the exposure planes of the cube-shaped ceria nanoparticles as the uniform {100} crystal planes. As a result of this unique morphology, the nanoparticles are found to show markedly enhanced UV-absorption capability as compared to either octahedron-shaped ceria nanoparticles or bulk ceria.
摘要：
Porous Ti<inf>2</inf>AlN ceramic, which was measured to be 3.23g/cm<sup>3</sup> about 74.9% of its theoretical value, was successfully synthesized and simultaneously consolidated from starting raw materials of Ti, Al, and TiN powders with a near-stoichiometric molar ratio of 1:1.03:1 by a microwave sintering method at 1200°C for 30min in an argon atmosphere. When sintered at 1200°C for 1h, the Ti<inf>2</inf>AlN grain showed a preferred growth behavior along the c-axis in the final ceramic, as shown by the results of an X-ray diffraction study. The Lotgering orientation factor on the surface of as-sintered Ti<inf>2</inf>AlN ceramic was as high as f<inf>(00ℓ)</inf>=0.598. A traditional synthesis method in a quartz tube furnace was also applied to synthesize the materials under the same conditions, but this did not result in similar preferred grain growth phenomenon. Factors affecting the orientation were discussed, and an underlying growth mechanism was suggested. Also, a dense Ti<inf>2</inf>AlN sample was obtained by re-sintering the porous Ti<inf>2</inf>AlN sample using a spark plasma sintering method. As a result, the orientation was maintained, and the density was measured to be 4.21g/cm<sup>3</sup>, which reached 97.6% of its theoretical value.
摘要：
To combat thermal-induced problems such as residual stress, deformation, and crack, induction heating is introduced into weld-based additive manufacturing process as a controlled thermal intervention. To date, however, numerical simulation of this induction-assisted weld-based additive manufacturing process is still a tough task; for conducting transient thermoelectromagnetic motion, coupling analysis is computationally prohibitive. In this paper, a simulation strategy is devised to address the problem. The coupling analysis is performed only at a typical time to obtain the representative distribution of induction heat, which is then transferred to the thermal analysis of multilayer deposition as a moving heat source. Utilizing this strategy, the effects of real-time induction preheating and postheating on residual stress state are analyzed in comparative simulations. The results show that both induction preheating and postheating lead to more homogeneous heat input and lower residual stresses compared with the case without induction heating.
作者：
Zuo Qing-song;E Jia-qiang*;Gong Jin-ke;Zhang, D. M.;Chen Tao;Jia Guo-hai
期刊：
Journal of Central South University,2014年21(12):4599-4606 ISSN：2095-2899
通讯作者：
E Jia-qiang
作者机构：
[Jia Guo-hai; E Jia-qiang; Gong Jin-ke; Zuo Qing-song; Chen Tao] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.;[Zuo Qing-song] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Zhang, D. M.] Calif State Univ Fresno, Dept Ind Technol, Fresno, CA 93740 USA.
通讯机构：
[E Jia-qiang] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.
摘要：
In order to reveal the mechanics of composite regeneration by coupling cerium-based additive and microwave for a diesel particulate filter, a composite regeneration model by coupling cerium-based additive and microwave for a diesel particulate filter was established based on field synergy theory. Performance evaluation on field synergy and composite regeneration of the diesel particulate filter was conducted by using the vortex crushing combustion and field synergy mathematical models. The results show that the peak temperature of the particulate filter body reaches 1180-1190 K when the regeneration time is 175 s, and there are optimal coordination degree between the velocity vector and temperature gradient of the filter body and the maximum ratio0.56-0.60 of the best burning regeneration region is obtained. Accordingly, the largest regeneration combustion rate inside the particulate filter body and the highest regeneration efficiency at the moment are achieved.
作者机构：
[Zhu, H. M.; Ringer, S. P.; Liu, Z. W.; Sha, G.] Univ Sydney, ARC Ctr Excellence Design Light Met, Australian Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia.;[Luo, C. P.; Zhu, H. M.; Liu, J. W.] S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China.;[Zhu, H. M.] Univ S China, Sch Mech Engn, Hengyang 421001, Peoples R China.
摘要：
This study presents the first experimental evidence of a hydrogen-induced decomposition reaction in an Mg–6Zn–0.6Zr–0.5Cu alloy from combined transmission electron microscopy and atom-probe tomography characterization. The reaction takes place due to the presence of H in the Mg matrix, causes the decomposition of pre-existing, high-temperature Zr–Zn intermetallic rods into Zr-rich hydride and β′ (Zn3Mg2), and forms novel composite precipitates in the Zr-rich cores of the alloy during ageing at 180 °C. The stoichiometry of the Zr–Zn rods was found to be Zn3(Zr1−x, Mgx)2, rather than Zn2Zr3, although both have a similar tetragonal crystal structure. The intrinsic link between the high-temperature Zr–Zn rods and the subsequent elongated composite precipitates, as depicted by the reaction, highlights the importance of engineering the Zr–Zn rod microstructures to control the final precipitate microstructure and effectively strengthen the Zr-rich cores, and hence the advanced Mg alloys.
期刊：
International Journal of Heat and Mass Transfer,2016年103:521-537 ISSN：0017-9310
通讯作者：
Zhang, Haiou
作者机构：
[Zhang, Haiou; Zhou, Xiangman] Huazhong Univ Sci & Technol, State Key Lab Digital Mfg Equipment & Technol, Wuhan 430074, Peoples R China.;[Wang, Guilan] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China.;[Bai, Xingwang] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Zhang, Haiou] Huazhong Univ Sci & Technol, State Key Lab Digital Mfg Equipment & Technol, Wuhan 430074, Peoples R China.
关键词：
Arc welding based additive manufacturing<&wdkj&>Arc<&wdkj&>Metal transport<&wdkj&>Numerical simulation
摘要：
In arc welding based additive manufacturing, the surface topographies of deposited layer are more complex than conventional welding, therefore, the distribution of the electromagnetic force in molten pool, arc pressure, plasma shear stress and heat flux on molten pool surface are not the same as the conventional welding. A three-dimensional weak coupling modeling method of the arc and metal transport is developed to simulate the arc, molten pool dynamic and droplet impingement in arc welding based additive manufacturing. In the arc model, the molten pool is simplified to be solid state on the basis of experimentally observed results. The arc is simulated firstly, and then the electromagnetic force, arc pressure, plasma shear stress and heat flux are extracted and transmitted to metal transport model. The volume of fluid (VOF) method is employed to track free surface of molten pool and droplet, and the continuum surface force (CSF) method is applied to transform all the surface forces on free surface as localized body forces. This weak coupling model has better accuracy than empirical model and decreases computational consumption. The molten pool morphology and cross-sectional profile of simulated results accord well with experimental results in both single-bead deposition and overlapping deposition, which indicates that this weak coupling modeling method is capable of simulating the complex heat and mass transfer phenomena in arc welding based additive manufacturing. (C) 2016 Elsevier Ltd. All rights reserved.
作者机构：
[Kuang, Tongchun; Zhou, Kesong; Tan, Chaolin; Li, Xueping; Cai, Panpan; Deng, Yang] S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China.;[Zhu, Hongmei] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Liu, Zongwen] Univ Sydney, Sch Chem & Biomol Engn, Sydney, NSW 2006, Australia.
通讯机构：
[Kuang, Tongchun] S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China.;[Zhu, Hongmei] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.
作者：
Wang, Xiangjiang*;Alici, Gursel;Chuc Huu Nguyen
期刊：
Smart Materials and Structures,2013年22(2):025004- ISSN：0964-1726
通讯作者：
Wang, Xiangjiang
作者机构：
[Wang, Xiangjiang] Univ S China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Chuc Huu Nguyen; Wang, Xiangjiang; Alici, Gursel] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia.;[Chuc Huu Nguyen; Alici, Gursel] Univ Wollongong, ARC Ctr Excellence Electromat Sci, Wollongong, NSW 2522, Australia.
通讯机构：
[Wang, Xiangjiang] Univ S China, Sch Mech Engn, Hengyang 421001, Peoples R China.
摘要：
This paper proposes an adaptive sliding mode control methodology to enhance the positioning ability of conducting polymer actuators typified by tri-layer conjugated polymer actuators. This is motivated by the search for an effective control strategy to command such actuators to a desired configuration in the presence of parametric uncertainties and unmodeled disturbances. After analyzing the stability of the adaptive sliding mode control system, experiments were conducted to demonstrate its satisfactory tracking ability, based on a series of experimental results. Implementation of the control law requires a valid model of the conducting polymer actuator and boundaries of the uncertainties and disturbances. Based on the theoretical and experimental results presented, the adaptive sliding mode control methodology is very attractive in the field of smart actuators which contain significant uncertainties and disturbances.
期刊：
Journal of Materials Science,2016年51(14):6735-6749 ISSN：0022-2461
通讯作者：
Zhang, Haiou
作者机构：
[Zhang, Haiou; Zhou, Xiangman] Huazhong Univ Sci & Technol, State Key Lab Digital Mfg Equipment & Technol, Wuhan 430074, Peoples R China.;[Zhao, Jingyi; Wang, Guilan; Fu, Youheng] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China.;[Bai, Xingwang] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Zhang, Haiou] Huazhong Univ Sci & Technol, State Key Lab Digital Mfg Equipment & Technol, Wuhan 430074, Peoples R China.
关键词：
Solid Fraction<&wdkj&>Cellular Automaton<&wdkj&>Weld Bead<&wdkj&>Rolling Reduction<&wdkj&>Cellular Automaton Model
摘要：
Hybrid deposition and micro-rolling (HDMR) is a metal additive manufacturing process that integrates arc direct deposition manufacturing and micro-rolling. A two-dimensional cellular automata and finite volume method coupling model is developed for simulating the microstructure evolution of solidification and the dynamic recrystallization during HDMR forming. The influences of different rolling reductions on dynamic recrystallization fraction, average equivalent radius of recrystallized grains, and the area of dynamic recrystallization region are discussed. The results show that solidification microstructure consists of complete columnar dendrite. The rolling reduction plays a dominant role in determining the area of dynamic recrystallization region and the size of recrystallized grains. The average recrystallized grain size at the top position is not affected by rolling reduction, while the influence of rolling reduction on the dynamic recrystallization fraction and average radius of recrystallized grain is found to be stable, but not linear. The same qualitative and quantitative conclusions are drawn from the experimental results as well.
摘要：
A hybrid architecture comprising three types of cerium nanoparticles, nano-octahedron and its ramifications, is synthesized via a facile yet efficient hydrothermal process. Comprehensive transmission electron microscopy analysis identifies the exposure planes of the cube-shaped ceria nanoparticles as {111} crystal planes. As a result of this unique morphology, the nanoparticles are found to show markedly enhanced material removal capacity and inferior polishing quality compared to the sphere-shaped ceria nanoparticles. (C) 2017 Elsevier B.V. All rights reserved.
