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Introduction Single crystal silicon are the important substrate materials of integrated circuits and TR optical materials because of its choiceness properties, such as high mechanical strength, steady chemical property, high refractive index, few dispersion and good optical constants[1].
This paper aims at exploring a new method of precision machining for hard and brittle materials.
So it is necessary to analyze the removal mechanism of hard-brittle materials.
When h is close to critical chip thickness hc, the phenomenon of brittle fracture should produce in materials, and the expression of formula of critical chip thickness is Eq.5: (5) Where ψ is dimensionless constant which is determined by material properties; H is hardness of materials; KIC is fracture toughness of materials.
Tian: Journal of Shandong University of Technology: Science and Technology，Vol. 26(2012)No. 4, pp. 53-55, 60(In Chinese); [6] J.

Journal of Materials Science and Technology, 29(7), 589-594
Journal Technology (Sciences & Engineering), 73(4), 69–76
Construction and Building Materials, 40, 738-745
Road Materials and Pavement Design, 1-23
Construction and Building Materials, 230, 116954.

Compares with steel members, concrete in the pouring process often lead to the practical elastic modulus, density and structure size deviate from the theoretical value for the non-uniformity of materials, the making error of template and others.
China Journal of Highway and Transport,2006, 19(6):49-53
Journal of Vibration and Shock, (2008), 27(7):174-178
Journal of Southwest Jiaotong University, (2001), 36(4):369-373
Journal of Zhengzhou University (Engineering Science), (2007),28(3):48-51

China 2School of Material Science and Engineering, University of Jinan, Jinan, 250022, P.R.
Introduction Silicon nitride ceramic materials have received a lot attention in the past decades, due to their wide applications in many fields including catalyst carrier, Gas turbines, the radome materials of the spacecraft, etc. [1-3].
Therefore, it is believed that Si3N4-BaTiO3 composite ceramics could be one of the candidates for wave-transparent materials.
Jia, Thermal shock and thermal fatigue resistance of Sialon- Si3N4 graded composite ceramic materials, Int.
Li, Preparation and properties of Si3N4-SiC radar wave-absorbing nanocomposites, Key Engineering Materials. 697 (2016) 462-466

As a result the graphene is one of the potential materials used to modify the gas sensor material [1].
Materials.
All materials are used without any further purification, and Deionized (DI) water was used throughout process.
SEM is used mainly to investigate the morphology and surface topography of materials.
Stanciu, and Jian Xie, Facile preparation of graphene/SnO2 xerogel hybrids as the anode material in Li-ion batteries, ACS Applied Materials & Interfaces (2015) [27] A.

Sciences, Darmstadt University of Applied Sciences, Haardtring 100, 64295 Darmstadt, Germany aromana.piat@h-da.de, bPascal-Alexander.happ@h-da.de Keywords: irregular inclusion shape, composites, elastic properties, FE-method Abstract.
Sinchuk: Key Engineering Materials, 488-489 (2012), p. 295 [3] G.
Dvorak: Micromechanics of Composite Materials, Solid Mechanics and its Applications (Springer, Netherlands 2013) [4] M.
Sevostianov: Micromechanics of materials, with Applications, Solid Mechanics and its Applications (Springer, 2018) [5] B.
Wadell: Journal of Geology, Vol. 43 (3) (1935) p.250

Materials of the study The fabric used in this study is a commercial glass plain weave fabric (Fig. 1.b).
Verpoest, Simulation of multi-layered composites forming, International Journal of Material Forming. 3 (2010) 695–698
Rebouillat, Tribological properties of woven para-aramid fabrics and their constituent yarns, Journal of Materials Science. 33 (1998) 3293–3301
Sherwood, Lu Liu, Julie Chen, Modeling of friction and shear in thermostamping of composites: part I, Journal of Composite Materials. 38 (21) (2004) 1911–1929
Ouagne, Soulat, Influence of the dry woven fabrics meso-structure on fabric/fabric contact behaviour, Journal of Composite Materials, Accepted (2011).

Introduction With the constant progress of science and technology, engineering materials also got rapid development.
Engineering ceramics with high hardness, good wear resistance and chemical resistance performance advantages, such as new materials become an increasingly common.
In the menu manager, select【 display cut material 】, observation tool cutting trajectory.
If satisfied with the tool path, then choose confirm cutting material.
References [1] Yang M Y，in: Development of a composite suitable for rapid prototype maching, edtied by Hou Yongtao, Journal of Materials Processing Technology,BJ(2001),in press

Research of A Structural Fuzzy Optimal Means Based On Material And Member Reliability Gangjun Zhai1, a, Yong Cheng1,b 1Deepwater engineering research center, Dalian University of Technology, Dalian 116024, China; azhai@dlut.edu.cn, bdeep_1@dlut.edu.cn Keywords: optimization, reliability, fuzzy optimization Abstract: The paper puts forward a structural fuzzy optimal means based on member reliability analysis and compares this means with common fuzzy optimum means on a example.
Introduction Optimization method can be used to improve production qualities, save raw material, reduce production cost and enhance economic efficiency.
Chinese journal of applied mechanics, 2005(1)
Journal of Anhui Institute of Architecture, 2002(1)
Journal of Huazhong University of Science and Technology, 2002(8).

Journal Catalysis, 2003, pp.434-441
Environmental Science & Technology, 2003, pp.4790-4797
Chemistry of Materials, 2004, pp.737-743
Applied Surface Science, 2010, pp. 6678-6682
Journal of Hazardous Materials, 2012, pp.331-339.