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Study on the forming mechanism for second step on hollow rotor shaft by 4-roll cross wedge rolling Yongming Yang1,2,a, Jiuchuan Chen1, Fengwen Cheng1,Jun Zhao1 1North China Institute of Aerospace Engineering, Langfang 065000,China 2College of Materials Science and Engineering, Yanshan University,Qinhuangdao,066004,China ayym@126.com Keywords: hollow motor shaft; rolling; finite element simulation Abstract.
It is three-dimensional compressive stress state that finishing the first step, it could improve plasticity of the material, decrease grain size [1].
Acknowledgements This research was sponsored by Hebei province science and technology research and development program (No.11212143) and Hebei Education Department science foundation (No.2011252).
Wang, et al: Journal of Plasticity Engineering, Vol.15 (2008),p. 81
Journal of University Science and Technology Beijing , Vol.32. (2010),P.526 [4] Z.H.Hu， K.S.Zhang， B.Y.

With the development of technology, lime-soil as a kind of composite materials has been widely used in transportation, civil engineering and so on.
(2) Soil is uniform, isotropic, elastic-plastic materials
Journal of underground space, 1999, 19（4）, 274～283
Beijing: Science press, 2010
Journal of Xi＇an University of Architecture & Technology (Natural Science Edition), 2010, 42（2）, 288～293.

Journal of Materials Processing Technology 135 (2003) ,p. 340
Materials Science and Engineering A 402 (2005) ,p. 84
Journal of Materials Processing Technology 135 (2003) ,p. 347
Journal of Materials Processing Technology 171 (2006),p. 35
Journal of Materials Processing Technology 136 (2003),p. 139

The objective of this study was to examine the influences of the type of cement and the CO2 concentration on the carbonation progress of cement materials.
Introduction The carbonation is a natural aging process for all cement materials.
Our conclusions are therefore consistent with the works of Hyvert et al. [3] and Ji et al. [8] which showed that the CO2 concentration did not affect the carbonation rate of cement materials.
Alonso, Chemical changes and phase analysis of OPC pastes carbonated at different CO2 cocentrations, Materials and Structures, Vol 42, Issue 4, 2009, pp. 515 – 525
Lai, 2010, Comparison of concrete carbonation process under natural condition and high CO2 concentration environments, Journal of Wuhan University of Technology – Materials, Vol 25, Issue 3, 2010, pp. 515-522

An extensive study on machining residual stress and their correlation with chip forming and tool geometries are available, but most researchers focus on the residual stress in turning and grinding all kinds of steel materials.
Experiment Experiment material.
Devor: Journal of Manufacturing Science and Engineering Vol. 123(2001), p. 748-752 [5] A.
Teti: Machining of composite materials.
Ai: Chinese Journal of Mechanical Engineering Vol. 43(4), p. 95-98

Preparations and Characterization of Sago Starch Dispersion and Modification, Advanced Materials Research, 620, pp 395-399
Transitional properties of starch colloid with particle reduction from micro- to nanometer, Journal of Colloid and Interface Science, 339, pp. 117 – 124
Preparation and Characterization of Amphiphilic Starch Nanocrystals, Journal of Applied Polymer Science, 107, pp 418 – 422
Mechanical and Morphological Properties of Films Based on Ultrasound Treated Titanium Dioxide Dispersion/Natural Rubber Latex, International Journal of Composite Materials, 1,1, pp 7-13
Reinforcement of Natural Rubber Latex Film by Ultrafine Calcium Carbonate, Journal of Applied Polymer Science, 87, pp 982–985

DIELECTRIC PROPERTIES OF ZrO2 DOPED ON NiO AT HIGH FREQUENCY Sharifah Aishah Syed Salim1, a, Julie Juliewatty Mohamed2, b, Zainal Arifin Ahmad3, c 1,2,3 School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia.
Therefore point defects in NiO crystals considered as an ideal solution for doping with other materials.
Figure 1(c) illustrates the effect of ZrO2 as a dopant material on lattice distortion of NiO.
ACKNOWLEDGMENTS The authors would like to acknowledge the materials and mineral resources engineering, USM and short term grant under project number (No. 814184) REFERENCES [1] J.
Hassan, “Synthesis and characterization of pure and ZrO2-doped nanocrystalline CuO–NiO system,” Journal Applied Surface Science. vol. 254, pp.1651–1660, July 2007

Schratzenstaller et al: European Heart Journal Vol. 26(15) (2005): p 1475-1481 [6] J.
Schratzenstaller et al: European Heart Journal Vol. 26(15) (2005): p 1475-1481 [7] A.
Tang: International Journal of Morden Physics B Vol. 23(6-7) (2009): p 1047-1052 [10] X.X.
Tang and Qingfu Chen: Applied Surface Science Vol. 255 (2008): p 371-374 [11] L.
Jaffrezic: Materials Science and Engineering C Vol. 21 (2002): p 157-165

Computational Materials Science 92 (2014), pp. 305-312
Computational Materials Science 89 (2014), pp. 233-241
Materials Science Forum 753 (2013), pp. 113-116
Computational Materials Science 21 (2001), pp. 69-78
Computational Materials Science 67 (2013), pp. 373-383

Finite element analysis of a steel bracket Xiaoliang Chena,*, Zuan Tianb and Yuanping Lic Department of Mechanics, Chongqing University of Science and Technology, Chongqing, China axlchen80@163.com, btianzu2@yahoo.com.cn, ccqlyp@126.com Keywords: Stress, Finite element method, Strength, Steel bracket Abstract.
In Fig. 3(b), the stress of point A is computed by the method of mechanics of materials as , (6) where , , , .
Acknowledgements This research is funded by Research Foundation of Chongqing University of Science and Technology, and the project No. is CK2011B25.
Clough, International Journal for Numerical Methods in Engineering, 60(2004)283–287
Topp, Journal of Aeronautical Sciences, 23(1956)805-824.