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Establishment of micro aggregate model Inhomogeneity, discontinuity and discreteness of the concrete materials, randomness of material parameter distribution is one of the important factors affecting the concrete elastic modulus and strength.
In order to fully reflect the characteristics of concrete existence, from the micro level of construction materials, the random mechanical parameter of random aggregate model.
Random mechanical parameter In order to describe the heterogeneity of material properties of concrete, not only the distribution of aggregate particles should conform to the actual situation is random, the mechanical parameters of each materials should also have a certain randomness.
Chinese Journal of Theoretical and Applied Mechanics, 2005, 37(4)516-521.
Elastic-plastic-brittle constitutive model of rocks and its numerical validation [J].Journal of China Coal Society,2012,37(4):585-589.

Gittings: Key Engineering Materials Vol. 284-286 (2005), p.349 [4] X.
Li: Key Engineering Materials Vol. 218-220 (2002), p.25 [6] J.
Tian :Key Engineering Materials Vol. 280-283(2005),p. 1541 [7] X.
Liu and A.P.Wong: Materials Letters Vol. 58 (2004), p. 397 [8] Z.Shen, E.Adolfsson, M.Nygren, L.Gao, H.
Niihara:Advanced Materials Vol.13 (2001) [9] R.Quan,D.Yang,X.Wu,H.Wang,and X.Miao: J.Materials.Science:Mater Med Vol.19 (2008),p.183 [10] V.

Material for components Different types of materials are used in making the machine.
Using different materials for the construction of the machine improves machine quality without sacrificing performance or durability.
Materials used in the machine are: Bakelit, POM, A6061, Brass, Carbon Steel.
These materials are assembled to create the product.
All materials are readily available in the market.

., Qingdao, P.R.China 2School of Materials Science and Engineering, Dalian Jiaotong University, Dalian, P.R.China a13793237339@139.com, b15275210266@163.com, c1466563499@qq.com, djincheng@126.com Keywords: Resistance Spot Welding; Indentation Depth; Finite Element Method; Electrode Strip Abstract.
Experimental Materials and Methods Two stainless steel plates formed a lap joint were used in the spot welding experiment.
R.: Welding Journal Vol. 27(6) (1948), p. 491-495
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[11] Hou, Z., Kim, I., Wang, Y., Li, C., Chen, C: Journal of Materials Processing Technology Vol. 185 (2007), p. 160–165.

Under fatigue loading, the element stress, failure and materials degradation should be analyzed in each loading of cycle.
Alschweig: Fatigue of Fibrous Composite Materials, (1981), p. 31 [9] A.
Shi: Mechanical Science and Technology, (1996) p. 897 [11] M.
Lessard: Journal of Composite Materials, 34 (2000), p. 1056 [12] M.
Lessard: Journal of Composite Materials, 34(2000), p. 1081 [13] K.

Materials.
Advanced Materials Research, 2011, 346(18):743-750
Journal of Hazardous Materials, 2004, 105(1-3):143-156
Journal of Hazardous Materials, 2007, 139(1):57-66
Journal of Colloid & Interface Science, 2002, 251(2):235-241.

Once processed into fully dense transparent material, γ-ALON displays high transmittance in the wavelength range of infrared, microwave and visible spectroscopy, which can be potentially used as thermo-resistant window materials, radome materials of infrared/microwave guided missiles, and armor materials with better bulletproof performance than the existing transparent bullet resistant materials.
Result and Discussion Preparation of aluminum oxide ceramic materials.
Mishra: Materials Letters, Vol. 58 (2003),P.136
Poslusny: Journal of the European Ceramic Society, Vol. 26 (2006), P.1351
Fuming: Materials Science and Engineering, Vol. 342 (2003), P.245

When the casting materials are injected into the holes, the drive pipe should be taken out.
(ii) Set up sleeve valve tube, pour casting materials When the design depth is obtained, casting materials (clay slurry) and grouting scope of material will be poured into the hole in order to prevent sleeve valve grouting pipe to be distorted or damaged.
ACKNOWLEDGEMENT This research is financially supported by National Science Foundation of China (Grant Nos. 51008097).
Sun, Down through the tunnel building protection scheme selection and grouting test plan, Journal of railway engineering, 2010,144 (9):35-40.
Zhang, The test research about post-grouting compressive pile mechanical properties, Journal of rock mechanics and engineering, 2009, 28 (3): 476-482.

A feature-based process planning approach for fineblanking-forming-stamping parts Yilin Wang,a, Huicai Long 1,b 1 State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China a wangyilin@mail.hust.edu.cn, b longhuicai@gmail.com Key words: fineblanking; process planning; process feature recognition; features representation Abstract.
Acknowledgement Project is supported by National Natural Science Foundation of China (grant no. 50875094).
Yamazaki: Journal of Materials Processing Technology, Vol.174 (2006), pp.74-81
Choi: Journal of Materials Processing Technology, Vol.111(2001), pp.188-192

(2) Don't think closely contact with the layers of material, considering the contact thermal resistance
(3) Think each homogeneous material constant physical property
Journal of Foreign Highway, 1997, 17（4）
JOURNAL OF BUILDING MATERIALS，2004，7(2)
Construction Science and Technology，2005，（4）