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Thus, the dynamic mechanical response of these materials is especially important to grant the required level of protection to armor.
There are two main fracture modes of brittle materials under compression, namely: split mode and crushed mode.
This indicates that these flaws in the materials can decrease the strength of the material.
Acknowledgements Financial supports from the National Nature Science Foundation of China.
Ravichandran: International Journal of Fracture Vol.101 (2000),p.141 Fracture of the grain G micro-voidG

Introduction Hybrid composite materials are increasingly gaining attention from researchers and engineers.
Materials and method Raw materials.
The test followed the ASTM D3410M, Standard Test Method for Compressive Properties of Polymer Matrix Composite Materials.
The matrix resin surrounds and supports the reinforcement materials by maintaining their relative positions and holds the reinforcement fibres together [6].
Rawlings, Composite Materials: Engineering and Science, Woodhead Publishing Limited, England, (2002) pp 12

Influence of Extrusion ratio on Forming of Thick-walled tube Jian Zhang1,2,a, Jianhua Song1,b, Xiaolan Wang1,c Xueqin Jin1, Zhihua Wang1,3 1 School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384, China 2 Key Laboratory of Display Materials & Photoelectric Devices (Tianjin University of Technology), Ministry of Education, Tianjin 300384, China 3Tianjin Key Lab for Photoelectric Materials & Devices, Tianjin 300384, China azhang_jian_99999@126.com,bsongjianhua20054500@126.com, cxiaolanjx@163.com Keyword: large diameter thick-walled pipe extrusion ratio simulation Abstract: Employed DEFORM software to simulate vertical extrusion of large diameter thick-walled pipe, by using the Finite Element Method in the three-dimensional modeling software Pro/E of the CAD platform.
Acknowledgements This work was supported by Ministry of Industry and Information Technology of the People’s Republic of China support project under Grant No.2009ZX04014-063-03 and Tianjin Key Subject for Materials Physics and Chemistry.
References [1] Jiahui Qu, Luming Yao, Mingkai Yue, Tao Huang, The influence of extrusion ratio on structure of AZ31 magnesium alloy, Journal of Light Alloy Fabrication Technology,Vol.3(2009)
[6] Xiaolin Wang, Yang Yu, Shujin Liang, Erde Wang, The influence of hot extrusion process on grain size and properties of AZ31 magnesium, Journal of Materials Science and Technology,Vol.6(2005)
[7] Suling Cai, A numerical simulation method of aluminum extrusion process, Journal of Modern Manufacturing Engineering,Vol.4(2008).

Introduction Vibration and impact are the most common external excitation in packaging system, the amount of energy absorbed by the packaging materials, when the packaged product reach its ultimate bearing strength , is an important index in packaging evaluation, the bigger the better.
Suppose the mass of an electronic product is m = 6 kg, and the contact area between the packaging materials and it is 0.05 m2.
MINDLIN: Bell System Technical Journal, Vol. 24 (1945) No. 3,4, pp. 353-461
Lu: Journal of Harbin University of Commerce(Natural Sciences Edition), Vol. 26 (2010) No.6, pp. 748-752
Lu: Journal of Vibration and Shock, Vol. 29(2010) No.10, pp.131-136+210

Grain growth simulations using the microstructure simulation system Elle have been performed in materials with a pre-existing grain shape preferred orientation.
Grain boundary migration in geological materials may be controlled by chemical, lattice defect and boundary energy driving forces [2].
Hirth: International Journal of Earth Sciences,Vol. 90, (2001), p. 88-103
Evans: Journal of the Virtual Explorer 4.
Urai : Journal of Structural Geology, Vol. 14, (1992), p. 1101-1109

The traditional way of vanadium extraction from ores is a hydrometallurgical process consisted of raw materials salt roasting with further leaching.
In the natural vanadium raw materials processing, roasting of the raw material with sodium chloride is widespread.
These factors could be one of the reasons for the low yield of vanadium from raw materials.
The most suitable reagents for roasting this type of vanadium raw materials are additives of sodium chloride and sodium carbonate.
Rabinovich, Complex processing of vanadium raw materials: chemistry and technology, Ekaterinburg: Ural Branch of the RAS, 2005

Materials and Experimental Details Raw Materials The LDPE matrix used in this study was provided by Titan Petchem (M) Sdn Bhd in solid pellets form with the density of 0.922 g/cm3.
Raw Material Preperation The CG was dried at 100oC in the oven for 3 hours.
Thomas, in: Composites Science and Technology, Vol. 62(3), p. 339-353. (2002) [10] D.
Ratnam, in: Journal of Applied Polymer Science, Vol. 124, p. 5220-5228. (2012) [13] A.
Zaman, in: Journal of Applied Polymer Science, Vol. 81(8), p. 1914- 1925. (2001)

Through the experience and summary of CFRD design and construction home and abroad, modern materials zoning tends to be standardization basically.
E-B model was used for dam materials (cushion material, transition material, main and secondary rock-fill) and concrete panel slab was considered as linear elastic material.
Physical and mechanical parameters of materials are shown in table 1.
Beijing: science press, 2008 [2] SONG Wenjing, Yang Xiaoming.
Journal of geotechnical engineering, 2009, 31(2):157-159.

Smart Materials and Structures, 13(5), 998-1055. (2004) [2] Olgac, N., Hansen, B.
Smart Materials and Structures, 14(1), 19-28. (2005) [6] Kidner, M.
Smart Materials and Structures, 10(4), 758-769. (2001) [7] Sun, H.
Journal of Intelligent Material Systems and Structures, 21(10), 1039-1047. (2010) [9] Gong X.
Journal of Mechanical Science and Technology, 26(11), 3411-3422. (2012)

Bijarimi1,e 1Material Science Programme, School of Applied Science, National University of Malaysia, Bandar Baru Bangi, 43000 Selangor, Malaysia.
Introduction Sandwich composite system is an interdisciplinary concept by combining the fields of material/material composite, production techniques, design and functionality to meet the high demands on modern materials and structures [1].
Hodgson, The Influence of Temperature on the Forming Behavior of Metal/Polymer Laminates in Sheet Metal Forming, Journal of Engineering Materials and Technology. 129 (2007) 530-537
Ettehad, Experimental and finite element study on the spring back of double curved aluminum/polypropylene/aluminum sandwich sheet, Materials & Design. 31(9) (2010) 4174-4183
Çoban, A review: Fibre metal laminates, background, bonding types and applied test methods, Materials and Design. 32 (2011) 3671–3685