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Glass ceramic materials are widely used in dental application because of their strong similarity with natural teeth.
In this study LAS glass ceramic/glass materials were prepared by glazing processing and characterized in terms of mechanical flexural strength.
Preliminary results clearly points out that the application of a glass on the support leads to the decrease of the flexural strength if compared to the materials without any coating applied.
Alain Kounga of Institut Straumann AG for the supply of the raw materials References [1] El-Meliegy E, van Noort R.
Materials Research Bulletin 2000; 35:2353-2361 [6] Guedes M, Ferro A C, Ferreira J M F.

Materials and methods The hybrids were prepared with inorganic phase composition of 70%SiO2-30%CaO and PVA fractions of 20 to 60% by the sol-gel [5].
Journal of materials science-materials in medicine , v. 16 ( 2005) p. 851-856
Key Engineering Materials, v. 361, (2008) p. 555-558
Journal of Sol-Gel Science and Technology, v. 47,(2008), p. 1-008-1777-1
Journal of Biomaterials Applications, v. 21 (2006), p. 167-178.

CFRP plates are explored according to the stress analysis of composite materials.
Du, et al, Composite reinforcement: Rencent development of continuous glass fibers, International Journal of Applied Glass Science. 8,1 (2017) 23-26
Koohbor, et al, The effect of nano-fillers on the in-plane and interlaminar shear properties of carbon fiber reinforced composite, Journal of Dynamic Behavior of Materials. 4,3 (2018) 296-307
Guang, et al, Mechanical properties of the cured laminates on the hot-press tackified preforms in vacuum assisted resin transfer molding, Journal of wuhan university of technology-materials science. 33 (2018) 242-248
Klaus, Predicting fiber composite damage and failure, Journal of Composite Materials. 49,21 (2015) 2673-2683.

Characteristics of welded materials are described.
Preparation of welded materials is outlined.
The parameters of materials used are given in Table 1.
Acarer: Materials Science and Engineering A363 (2003) p. 290 [4] S.
Al-Hassami: Journal of materials processing technology 202 (2008) p. 224

The workpiece material is 3Cr1Mo1/4V and the tool specification is 16×16 square index-able milling insert including the traditional flat rake face milling insert and the waved edge milling insert which is developed by Harbin University of Science and Technology.
Xu: Journal of Hubei Automotive Industries Institute.
[2] Deshayes L: Journal of Material Processing Technology, Vol. 190 (2007), pp. 251
Yuan: Journal of Harbin Institute of Technology.
Li: Chinese Journal of Mechanical Engineering, Vol. 40 (2004), pp. 106 (in Chinese)

The seepage coefficients of the dam body, dam foundation，core wall and grouting curtain materials are listed in Table 1[6,7].
Seepage coefficient of the dam body materials the layers of foundation Materials Seepage coefficient (cm/s) Materials Seepage coefficient (cm/s) Gravelly Soil core material 1.0×10-5 Concrete structure 1.0×10-7 Contact soil material 1.0×10-6 Grouting curtain 7.5×10-6 Filter materialI 5.0×10-3 Fresh base rock 1.0×10-5 Filter materialII 8.0×10-3 Micro weathered base rock 3.0×10-5 transitional material 3.0×10-2 Weakly weathered base rock（The upper part） 1.0×10-4 Main rockfill material 1.0×10-1 Weakly weathered base rock（The lower part） 1.0×10-4 Downstream secondary rockfill material 8.0×10-2 hard weathered base rock 5.0×10-4 Analysis of seepage field characteristics The peak height of different time of the free surface in core wall under the empty reservoir case are shown in table 2.
Journal of Hohai University (Natural Science).Vol.27(3) (1996), p.22-29 [2] Shen, Z.
Journal of Hohai University (Natural Science).
Journal of Hohai University (Natural Science).Vol:22(5) (1994), p.75-77

SPS can be used to prepare for metallic materials, ceramic materials and composite materials [19, 20].
It can also be used to prepare for nano block materials, amorphous block materials, functionally gradient materials and so on.
Kato, et al., Fe76Si9.6B8.4P6 glassy powder soft-magnetic cores with low core loss prepared by spark-plasma sintering, Materials Science and Engineering.
Deng, et al., Preparation of pure iron/Ni–Zn ferrite high strength soft magnetic composite by spark plasma sintering, Journal of Magnetism and Magnetic Materials. 361 (2014), 166-169
Huang, Preparation and soft magnetic properties of composite magnetic cores of Fe-based nanocrystalline and ferrite, Journal of Functional Materials. 11 (2008), 008

Some scholars tried to establish strength theory of materials based on energy principles, and have made gratifying progress.
We know that the elastic strain energy is the energy driving material failure, but the volumetric strain energy is beneficial to stability, this is because rock, soil and concrete belongs to frictional materials.
Xie et al suggested a failure criterion for rock materials based on the releasable elastic strain energy before failure[13], which can be called as the energy release rate theory.
Xie: Journal of Sichuan University(Engineering Science edition) Vol. 40(2)(2008), p. 26 (in Chinese) [10] Q.Y.
Xue: China Civil Engineering Journal Vol. 45(9)(2012), p. 122 (in Chinese)

Liao et al. [25] finally suggested a planar isotropic yield criterion for porous materials with spherical voids.
Socie: Fatigue and Fracture of Engineering Materials and Structures Vol. 11 (1988), p. 149 [7] D.F.
Engineering Materials and Tech.
Engineering Materials and Tech.
Engineering Materials Struct.

Ma, et al., Journal of Sol-Gel Science and Technology, vol. 58, pp. 259-268, 2010
Ma, et al., Journal of Environmental Sciences, vol. 24, pp. 757-764, 2012
Weng, Progress in Natural Science: Materials International, vol. 22, pp. 7-14, 2012
Mutinda, Advanced Materials Research, vol. 512-515, pp. 1624-1629, 2012
Chen, Materials Research Bulletin, vol. 48, pp. 495-503, 2013