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The results provide a theoretical basis for saving material and achieving the cross wedge rolling production without the stub bar. 1 Introduction CWR is widely used in forming axis parts at present as its advantages of high efficiency and saving materials [1,2].
International journal of machine tools and manufacture,2000,40:49-63
The Publishing House of Science Beijing, 2010
Journal of University of Science and Technology Beijing, 2005(2) 222-226
University of Science and Technology Beijing, 2006

The attainment of an efficient encapsulation requires a thermal interface material (TIM), such as thermal adhesives, greases, phase change materials (PCMs) and thermal pads.
Typical interface materials are prepared by silicone rubber filled with thermal conductive fillers.
CTE of composite materials and aluminum was in the same order of magnitude.
This flexible composite can be used as thermal interface materials.
Vol.10 (2010), p.359-363 [13] Agari Y, Ueda A, Nagai S: Journal of Applied Polymer Science.

The test used Φ100 mm × 500 mm cylindrical specimens which are composed by the following materials: 42.5R ordinary Portland cement was used for cement and continuous river gravel with maximum diameter 20mm was applied for coarse aggregate gradation.
Acknowledgements This work was financially supported by the National Natural Science Foundation of China (51279092), Project of Natural Science Foundation of Hubei Province, China (2013CFB218), and Science and Technology Research and Development Project of Yichang, China (A2011-302-5).
References [1] Jiang zhifeng: Steel fiber reinforced concrete(Central Research Institute of Building and Construction, Ministry of Metallurgical Industry, China 1984)(in Chinese) [2] Gao Danying, Zhao Jun, Zhu Haitang: Design and application of steel fiber reinforced concrete(China Building Industry Press, China 2002)(in Chinese) [3] Thomas J, Ramaswamy A: Journal of materials in civil engineering.
Vol. 61(1964), p. 657 [8] Naaman A E, Najm H: ACI Materials Journal.
Vol. 21(1990), p. 132 [10] Soroushian P, Bayasi Z: ACI Materials Journal.

Experimental Approach Materials.
Journal of Applied Polymer Science 83 (2002) 1432-1442
Journal of Macromolecular Science 44(3) (2004) 231-274
Orbit Journal 1(1) (2001) 1-9
Mechanics of Materials 42 (2010) 344-353

Science Officer), Mr.
Chen, Reactive ball milling to produce nanocrystalline ZnO, Materials Letters 62 (2008) 4047-4049
[7] A.K Srivastava, Direct evidence for electron beam irradiation-induced phenomena in nanowired ZnO thin films, Materials Letters 62 (2008) 4296-4298
[9] Xiulan Hu, Yoshitake Masuda, Tatsuki Ohji, Kazumi Kato, In situ forced hydrolysis-assisted fabrication and photo-induced electrical property in sensor of ZnO nanoarrays, Journal of Colloid and Interface Science 325 (2008) 459-463
Scherer, Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing, New York: Academic Press, 803, 1975

Zhou: Food Science.
Jin and B.Hu: Advanced Materials Research.
Wu: Advanced Materials Research.
Zhang: Learned Journal of Hebei Academy of Sciences.
Zheng: Applied Mechanics and Materials.

Empirical method is the first one to be used , but with the emergence of new materials, new technology, empirical method is not applicable in many ways; Analytical method mainly uses the space expansion theory and the theory of differential surface force source; numerical method is with the aid of computer technology, by finite element method or finite difference method to numerically simulate the problem of penetration, this method is of high speed, low cost, and can simulate the operation of the projectile trajectory.Thus,more direct, more used.
Five groups of tests were conducted, the object is ultra high performance cement-based composite materials Experiment, when the bullet into vertical target, first with the positive impact of concrete, and hardness, compressive strength of concrete itself, can have high stress zone around the spot for the impact of the child, while the concrete around the bullet in the head will produce radial compression stress wave, the bullet further into the target material, is a phenomenon of shear, extrusion, and the effect of free surface of the target for make the concrete material around the bullet point from the medium particles, eventually forming a kind of like a funnel pits and radial crack, formation of the pit area should be greater than the cross-sectional area of the bullet.
Journal of explosion and shock, 2002, 22 (4) : 368-371 [3] Kenedy R P.
Journal Southeast University,1991,21(1):1-7
Journal of PLA University of Science and Technology, 2005, 6(2) : 142-145.

Preparation and Characterization of Platinum/Polyaniline Core-shell Composite Jingna Zhu, Zhenlu Shen*, Weimin Mo and Meichao Li Research Center of Analysis and Measurement, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, Zhejiang, China email: zhenlushen@zjut.edu.cn Keywords: core-shell composite; platinum; polyaniline; chemical synthesis Abstract.
Ye: Journal of Physical Chemistry C Vol. 111 (2007), P. 8463 [6] M.
Taejin: Materials Science Forum (2010), P. 2771 [11] J.
Lee: Journal of Polymer Science Part a-Polymer Chemistry Vol. 45 (2007), P. 5741 [20] A.
Wang: Journal of Polymer Science Part a-Polymer Chemistry Vol. 48 (2010), P. 3903

Experimental Materials.
Chemistry of Materials, 2007. 19(3): p. 393-401
Journal of Applied Polymer Science, 2008. 108(2): p. 705-712
Journal of Functional Materials, 2013. 5: p. 740-743
Journal of Applied Polymer Science, 2012. 125(5): p. 3552-3559

Annealing Heat Treatment of ZnO Nanoparticles Grown on Porous Si Substrate Using Spin-Coating Method, Advances in Materials Science and Engineering, 2014 (2014) 6
Morphology and optical properties of zinc oxide thin films grown on Si (100) by metal-organic chemical vapor deposition, Journal of Materials Science: Materials in Electronics, 20 (S1) (2008) 441-445
Growth of ZnO Nanosturctures on Porous Silicon in Different Concentration of Zn2+ Ion, Advanced Materials Research, 832 (2014) 691-694
Microstructure and Materials Properties, 8 (6) (2013) 478-487
Surface Morphology of Seeded Nanostructured ZnO on Silicon by Sol-Gel Technique, Advanced Materials Research, 667 (2013) 265-271