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Actually, when the stress reaches a certain value, materials are no longer linear change and the plastic strain occurs[4,5,6].
However, for some materials it is difficult to obtain, we can treat it as penalty parameters as advocated by Diehl[10].
Acknowledgements This work was financially supported by the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period, Republic of China, under Grant No. 2008BAB29B03.
[3] LUAN Mao-tian, WU Ya-jun, NIAN Ting-kai: Journal of disaster and mitigation engineering (In Chinese) Vol.23(2003)，p.1-8 [4] Zienkiewicz O C, Humpheson C and Lewis R W: Geotechnique Vol.25(1975), p.671-689 [5] HUShaowei, LU Jun: JOURNAL OF HYDROELECTRIC ENGINEERING(In Chinese) Vol.28(2009), p. 37-77 [6] Chen Jianyun, Hu Zhiqiang, LinGao: Chinese Journal of Computational Mechanics(In Chinese) Vol.28(2009), p. 43-49 [7] Park K.
[10] Diehl, T.: International Journal of Adhesion and Adhesives Vol.28,( 2008), p. 256–265 [11] M.L.

This model was mainly used to calculate the relative concentration values (X/Q) to analyze the possible effect of radioactive materials when the design basis accident happens.
The way of release was one of the important factors affecting the atmosphere dispersion of radioactive materials.
Croatian Meteorological Journal, Vol. 43 (2008), p.111-115 [5] D.
International Journal of Environmental Sciences, Vol. 1 (2011), p.1283-1290 [9] D.
PAVAN: An Atmospheric dispersion program for evaluating design basis accidental releases of radioactive materials from nuclear power stations.

The three polymeric materials cellulose, hemi-cellulose and lignin constitute the cell wall of wood and are responsible for its properties.
Materials and Method Starting Materials: All the chemicals and solvent (AR) were obtained from M/s C.D.H.
Science and Technology, Vol. 34, 2006, p. 67
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So, it is found that the laser welding of Hastelloy C-276 alloy of cans not only does not destroy the electric performance of welding materials but enhance it and decline the eddy current losses of can forming with it.
References [1] M.Farid, P.A.Molian: Journal of Materials Science.
[2] Remy Fabbro1, Frederic Coste1, Dominique Goebels, e.g: Journal of Physics D.
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[6] Xiaochen Zhang, Weili Li and Junci Cao: Journal of HARBIN Institute of Technology.

It Is often a result of the combined actions of multiple factors.Therefore, it is very important to select reasonable evaluation factors.Combined with actual situation, ultimately,we choose six factors ,concluding pipe material (M), pipe diameter(C),laying depth(D), pipe age(L), soil conditions(S), hydraulic pressure(P),as the contestant factor setting up the assembly of evaluation factors.
That is to say, Evaluation factors set U={ M,C,D,L,S,P}={ pipe material,pipe diameter,laying depth,pipe age,soil conditions,hydraulic pressure }.
For qualitative factors, such as soil conditions, pipe material, expert scoring method is used to determine its membership degree.for quantitative factors, such as pipe diameter, water pressure, pipe material, membership function is used to determine the membership degree.
Table9 The basic attributes of a pipeline Pipe material C D L S P Nodular cast iron pipe DN200 2m 20 terra-cotta intermediate pressure Table10 Score of pipe Pipe material C D L S P 1 2 2 4 3 4 The construction of the judgment matrix R= (4) The corresponding index weights W={0.79, 0.48 , 0.29 , 0.17 , 0.10, 0.06},By the fuzzy transformation,A=W·R={0.85 , 0.63 , 0.27 , 0.09 , 0.05 },Results show that the 0.85 isr the maximum.
References [1] Xi Jin: Journal of Hohai University(Natural Sciences), Vol.39 (2011), (In Chinese) [2] Nan Li, Jia Han: Shanxi Architecture, Vol.38 (2012), (In Chinese) [3]Jun Liu, Guoping Yu: Journal Of TongJi University(Nature Science), Vol.39 (2011), (In Chinese) [4] Zhen Li, Liang Pei et al: China Water & Wastew Ater, Vol.25 (2009), (In Chinese) [5] Yan Guo, Jinghai Han: Mechanical Management And Development, No.6 (2007), (In Chinese) [6] Lening Ma, Wenjun Liu et al: Water & Wastewater Engimeering, Vol.32 (2006), (In Chinese) [7] Yuejin Li, Boying Qin et al: Journal of Chongqing Institute of Technology, Vol.18 (2004), (In Chinese) [8] Guangxing Song, Deli Yang: Systems Engineering, Vol.21 (2003), (In Chinese) [9] Sihan Xiao, Zhiping Fan et al : Journal Of Systems Engineering, Vol.16 (2001), (In Chinese) [10] Jijun Zhang: Fuzzy Systems and Mathematics, Vol.14 (2000), (In Chinese)

Introduction In recent years, laser surface modification technique has been rapidly used in in fields of Increasing abrasion, corrosion resisting and oxidation resisting properties of materials.
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Introduction A composite material is defined as a combination of materials which has one or more different elements, which when combined together produce a material which is strong, stiff, tough and more durable than each individual element.
During the last decades, the application of composite materials has become increasingly popular especially in aerospace structures.
These materials can be of great benefit to aviation, as lighter materials translate into lower fuel consumption and higher performance of aircraft.
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Zhu3,c Department of Mechanical and Energy Engineering, Southern University of Science and Technology and Shenzhen Kay Laboratory for Additive Manufacturing of High Performance Materials, Shenzhen, 518055, China.
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Matsuda, Particle size distributions in functionally graded materials fabricated by the centrifugal solid-particle method, Composites Science and Technology 62 (2002) 881–888

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