China Academy of Ordnance Science

Ningbo, China

China Academy of Ordnance Science

Ningbo, China
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Tan S.K.,China Academy of Ordnance Science | Tan S.K.,Xi'an Jiaotong University | Song X.P.,Xi'an Jiaotong University | Qiao L.,China Academy of Ordnance Science | And 3 more authors.
Advanced Materials Research | Year: 2011

By means of mechanical properties test, the relationship among particle size, electric field, magnetic field,electromagnetic field and shear ratio on the Ni/TiO2/Urea core-shell particles electrorheological fluid properties analyses. It is found that with increasing particle size, the property of electrorheological fluid decreased, and with increasing shear ratio the property of electrorheological fluid increased for same composition ER. At same time, the smaller of particle size, the higher of ER properties, but there is a critical value for shear ratio, the properties of ER is near value for same composition ER fluid. In magnetic field, the properties of ER showed a contrary result, the smaller of particle size, the lower of ER properties, and electromagnetic field make the properties increase. © (2011) Trans Tech Publications.


Tan S.K.,China Academy of Ordnance Science | Tan S.K.,Xi'an Jiaotong University | Song X.P.,Xi'an Jiaotong University | Qiao L.,China Academy of Ordnance Science | And 3 more authors.
Advanced Materials Research | Year: 2011

By means of mechanical properties test and microstructure graph observation, the relationship of heat treatment temperature of core-shell Ni/TiO2 group particles with mechanical properties under different electric field has been researched .It is found that the FT-IR, XRD morphology of heat treatment at 350°C is different from the one at 100°C, the shear stress of same composition ER decreased with heat treatment temperature increasing. But the leakage current density of ER shows contrary result. That is because the leakage current density of ER decreased with the increasing heat treatment temperature. © (2011) Trans Tech Publications.


Yan Y.B.,Nanjing University of Science and Technology | Zhang Z.W.,Nanjing University of Science and Technology | Zhang Z.W.,Auburn University | Shen W.,Auburn University | And 3 more authors.
Materials Science and Engineering A | Year: 2010

A composite plate of Mg alloy (AZ31B) and an Al alloy (7075) was fabricated by explosive welding. The microstructure and properties of the bonding interface after explosive cladding were investigated. The results show that the bonding interface had a wavy appearance with solidified melts in a regularly spaced pattern of discrete regions. Adiabatic shear bands and twin structure were found on the AZ31B Mg alloy side. "Metallurgical bonding" of the explosive welding interface was achieved by local diffusion with an approximate 3.5 μm thick diffusion layer. No intermetallics were formed. Shear strength across the bonding interface of AZ31B/7075 composite was ca. 70 MPa. The maximum bending stress reached 670 MPa. © 2009 Elsevier B.V. All rights reserved.


Tan S.K.,China Academy of Ordnance Science | Tan S.K.,Xi'an Jiaotong University | Song X.P.,Xi'an Jiaotong University | Guo H.Y.,China Academy of Ordnance Science | And 2 more authors.
Materials Science Forum | Year: 2011

Electrorheological (ER) fluids are regarded as smart materials with potential for application in various industries because of the controllable viscosity, the reversibly and fast response. In this paper, core-shell structured Ni/Ti/Urea nanoparticles, as an ER material, were prepared by a sol-gel method. TEM, XRD and FT-IR spectra demonstrated that the Ni nanoparticles have been homogeneously coated with a 2 nm thick layer of TiO 2 containing polar groups. The polar groups were caused by the introduction of urea. The ER effect of the fluids of Ni/Ti/Urea particles in silicone oil was investigated under a DC electric field. It is found that the ER fluids of the urea-doped Ni/TiO2/Urea particles have a high ER activity, which is 10 times that of the particles containing no urea. The polar groups in the particles are the intrinsic reasons for the enhancement of electrorheological effect. © (2011) Trans Tech Publications.


Zhang Y.,CAS Ningbo Institute of Material Technology and Engineering | Liu J.,CAS Ningbo Institute of Material Technology and Engineering | Zheng Q.,Ningbo University of Technology | Zheng Q.,China Academy of Ordnance Science | And 4 more authors.
Scripta Materialia | Year: 2014

The microstructure, magnetocaloric effect and mechanical properties of carbon-doped Ni43Mn46Sn11Cx (x = 0, 2, 4, 8) alloys have been investigated. The martensitic transformation temperatures increase remarkably, from 196 to 249 K, as the carbon doping content increases. A large magnetic entropy change, ΔSM, from 27.4 J kg-1 K-1 with x = 0 to 34.6 J kg-1 K-1 with x = 2, was obtained for a field change of 5 T. A significant enhancement of compressive strength from 556 MPa with x = 0 up to 1016 MPa with x = 8 is ascribed to the appearance of high amount of carbides. © 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.


Hu Q.,Northwestern Polytechnical University | Hu Q.,China Academy of Ordnance Science | Liu L.,Northwestern Polytechnical University | Zhao X.-B.,Northwestern Polytechnical University | And 3 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2013

The phase transformation temperature, segregation behavior of elements and as-cast microstructure were investigated in experimental nickel-base superalloys with different levels of carbon and boron. The results show that the liquidus temperature decreases gradually but the carbide solvus temperature increases obviously with increasing carbon addition. Minor boron addition to the alloy decreases the liquidus temperature, carbide solvus temperature and solidus temperature slightly. Apart from rhenium, the segregation coefficients of the elements alter insignificantly with the addition of carbon. The segregation behavior of rhenium, tungsten and tantalum become more severe with boron addition. The volume fraction and size of primary carbides increase with increasing carbon addition. The main morphology of the carbides is script-like in the alloys with carbon addition while the carbide sheets tend to be concentrated and coarse in the boron-containing alloys. © 2013 The Nonferrous Metals Society of China.


Wang J.,Beijing Institute of Technology | Qian J.,Beijing Institute of Technology | Zhang X.,Beijing Institute of Technology | Wang Y.,China Academy of Ordnance Science
Rare Metals | Year: 2011

With the development of science and technology, comprehensive performance of high temperature structural materials were demanded urgently. In this paper, the Ni 3Al and NiAl high temperature structural materials were summarized. Various properties of Ni 3Al and NiAl were briefly discussed. As well as, various preparations of intermetallics compounds were retrospected. Ni 3Al and NiAl alloys have good performance such as high melting point, excellent oxidizability resistance under high temperature, moderate density, outstanding heat and electrical conductivity, which were considered as the outlook high temperature structural materials at the present and become emphasis which were exploited and researched. © The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2011.


Wang H.,Beijing Institute of Technology | Lin D.-F.,Beijing Institute of Technology | Wang J.,Beijing Institute of Technology | Cheng Z.-X.,China Academy of Ordnance Science
ICACTE 2010 - 2010 3rd International Conference on Advanced Computer Theory and Engineering, Proceedings | Year: 2010

In order to eliminate the static error, PI compensator was introduced to the classic two-loop autopilot and the contribution of PI was analyzed while the equivalent time constant estimates of two-loop autopilot with PI was discussed. Four different objective functions were introduced to the design procedures. It is concluded that it is the large gain at low frequency of PI solved the problem of static error. © 2010 IEEE.


She H.-P.,Beijing Institute of Technology | Ni H.,China Academy of Ordnance Science
25th International Symposium on Ballistics, ISB 2010 | Year: 2010

In order to solve stochastic optimal design of exterior ballistics, Stochastic Simulation Search Method is brought forward, which is a convenient and effective way by combining deterministic optimization algorithm and stochastic simulation directly. The principle of Stochastic Simulation Search Method is to search by deterministic optimization algorithm according to the average of random variables, and execute stochastic simulation at each search point to identify the feasibility of the design points and their corresponding target value, which repeats until optimization process is convergent. The method is applied to a typical example that can verify the feasibility of it, and characteristics of it are analyzed.


Chen X.-H.,Beijing Institute of Technology | Liu Z.-B.,Beijing Institute of Technology | Wang X.-B.,Beijing Institute of Technology | Li Z.-X.,Beijing Institute of Technology | Wu Y.,China Academy of Ordnance Science
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2013

To determine the tool position relative to the workpiece in machining of typical turn-mill parts, an analysis method for kinematics characteristic of typical turn-mill parts machining was presented. Based on analyzing the configuration of the turn-mill machine tool, the kinematics chain was determined, and the kinematics model was found according to the modified D-H notation. The form-shaping function matrixes were derived based on forward kinematics and inverse kinematics. Through the transformation of homogeneous coordinates, the tool position relative to the workpiece in different feature machining of turn-mill parts was described, and the kinematics functions of each axis were obtained by combining with the form-shaping function matrixes. Thus, the kinematics characteristic in turn-mill machining was analyzed by proposed function. Through an example of kinematics characteristic analysis of non-coaxial turn-mill part, the effectiveness of this methodology was proved to analyze the tool position relative to the workpiece and the movement of each axis in turn-mill machining.

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