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The element constitutive law considers the fracture energy of the material and its spatial variation are used to take into account the heterogeneity of the simulated materials.
The softening law for quasi-brittle materials proposed by Hilleborg[3] was adopted to handle the behavior of quasi-brittle materials.
The shape of the failure surface presented in Fig. 6a is similar to that obtained for fragile materials.
This rate is similar to the values found in almost fragile real materials as concrete or rock [6, 7, 8, 9, 10].
Mansour, Biaxial strength and deformational behavior of plain and steel fiber concrete, ACI Material Journal, 354–362, 1991

Commercially available fully formulated lubricating oils are specially produced to enhance the lubrication of ferrous materials.
Lubricants are so far formulated to act with ferrous materials, therefore DLC/steel combination shows better frictional properties compared to DLC/DLC contact.
Dai, Key Engineering Materials, 434 (2010) p.477-480
Evans, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 223 (2009) p.103-141
Dai, Materials & Design, 51 (2013) p.775-779

However, the complex composition solution of sea with electrolyte solution has high conductivity and biological activity, metallic materials are eroded easily in the sea [1,2].
Sample preparation and test methods The row materials are pure metals.
Acknowledgments This work was financially supported by Natural Science Foundation of Jiangxi (No.2009GZC0048), by Open Foundation of Jiangxi Key Laboratory for Advanced Copper and Tungsten Materials (No.2010-WT-03) References [1] Dong Shangbo.
Aging characteristics and precipitate analysis of Cu-Ni-Mn-P alloy, Materials Science and Engineering A,2007,458:295~302 [5] Tian Rongzhang, Wang Zhutang.
The Chinese Journal of Nonferrous Metals, 2004,14(11):1869~1874 [11] Wang Peng.

Materials Science and Engineering A, vol. 326, pp. 382-385, 2002
Journal of Materials Processing Technology, vol. 137, pp. 17-20, 2003
Valitov, “Processing and mechanical properties of bulk nanostructured nickel-based alloys,” [J].Materials Science and Engineering A, vol. 503(1-2), pp. 181-184, 2009
Transactions of Materials and Heat Treatment, vol. 30(6), pp. 111-115, 2009
Materials for Mechanical Engineering, vol. 27(1), pp. 15-17, 2003

Wang et al.: Journal of Magnetism and Magnetic Materials Vol. 246 (2002), pp. 434-439
Clemente, et al.: Journal of Materials Science Vol. 32 (1997), pp. 1025-1028
Emura: Enginnering Materials, in press
Wang et al.: Materials Chemistry and Physics Vol. 77 (2002), pp. 248-253
Pullar et al.: Journal of Magnetism and Magnetic Materials Vol. 186 (1998), pp. 313- 325.

Based on these similarities model material would be prepared, then elastic modulus similitude ratio of model material could be determined.
If simple improve density of material will caused gravity distortion.
Acknowledgements This work was supported by the National Science and Technology Support Plan of China (Grant No.2011BAK12B07), the Scientific and Technological Research Project in Gansu province (Grant No.
JK2010-12), the Natural Science Foundation of Gansu Province (Grant No. 1112RJZA009).
References [1] Li Zhenbao, Li Xiaoliang (2010), Technology for Earthquake Disaster Prevention,5(4):439-450 [2] Jiang Xinliang, XuBingwei, Li Zhu (2010), Journal of Vibration Engineering,23(2):225-229 [3] Li Yue, Jiang Xin-liang(2010), Engineering Mechanics,27(1):73-80 [4] Jiang Liangwei,Yao Lingkan,WangJian (2009), Journal of Transport and Engineering,25(2):1-7 [5] Zheng Yingren, Ye Hailin, Huang Runqiu (2009), Chinese Journal of Rock Mechanics and Engineering,28(8):1714-1724 [6] Li Xiuzhen, Kong Jiming(2010), Journal of Sichuan University (Engineering Science Edition),42(5):243-249 [7] Sun Zaiming, Yuan Jing, Sun Qiang (2010), Railway Engineering, 12:0081-0084

The unique properties of these nanostructured materials, such as composition, size and shape, play an important role in term of performance and application [1].
Especially nanocatalyst materials in biofuel conversion field, the selection of proper precursor material has greatly affected the properties and performances of the final product.
In recent year, there has been great interest on metal oxalate as precursor materials due to their ability to form metal oxide or metal without losing their ordered structure during the synthesis of nanostructured catalysts [3].
Haider, Synthesis and characterization of uniform fine particles of copper oxalate, Materials Letters. 63 (2009) 2355-2357
Xu, The convenient preparation of porous CuO via copper oxalate precursor, Materials Research Bulletin. 43 (2008) 2434-2440.

Epoxy Resin) to bind materials at room temperature, which is available for most bonding structure between ceramic and metal.
What's more, the selection of the interlayer materials generates important effect on ballistic performance.
Experimental Procedure Materials and Specimens.
Han: Journal of University of Science and Technology Beijing, Vol. 29 (2007) No.4, pp. 402-407.
Kevin: Ceramic Armor Materials by Design, Vol. 134 (2002) , pp.635-642

Materials and Experimental Procedures The received testing material is cast nickel based superalloy, grade Inconel 738, a gas turbine blade material after 50000 hours service.
Homkrajai, Gamma prime phase stability after long-term thermal exposure in cast nickel based superalloy, IN-738, Chiang Mai Journal of Sciences 36 (2009) 312-319
Chuankrerkkul, Microstructural restoration by HIP and heat treatment processes in cast nickel based superalloy, IN-738, Chiang Mai Journal of Sciences 36 (2009) 287-295
Panich, Gamma prime particle coarsening behavior at elevated temperatures in cast nickel-based superalloy, GTD-111 EA, High Temperature Materials and Processes 27 (2008) 41-49
Pongsugitwat, New nickel based superalloys development by vacuum arc melting process based on aluminium addition of GTD111, Advanced Materials Research 1025-1026 (2014) 455-460.

However, studies were almost focused on silicon nitride materials with low porosity (<50%) and high strength, and few research was reported about silicon nitride materials with low dielectric(ε<3, tgδ<0.01), high porosity (>50%) and high strength used as core layer of the broadband radome.
In this work, low dielectric porous silicon nitride ceramic radome materials with both high porosity and high strength were prepared by adding pore-forming agent through partial sintering technique.
XRD of Si3N4 powder as initial raw materials Results and Discussion Density and porosity of porous silicon nitride with different PMMA content was shown in figure 2.
Acknowledgement This research was financially supported by the Natural Science Foundation of Shandong Province (Project No.
Hampshire, Characterisation of Porous Silicon Nitride Materials Produced with Starch, J.