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Concrete, ceramics materials and rocks are considered to be fragile materials.
Materials & Design, 2014
Pilakoutas: Construction and Building Materials Vol. 25 (2011), p. 218
Cluzel: Journal of the Mechanical Behavior of Biomedical Materials Vol. 38 (2014), p.134
Lees: Procedia Materials Science Vol. 3 (2014), p.15805

Based on the investigation and analysis on the pavement structure, material and traffic accidents of highway tunnel, security and function of transition section at highway tunnel’s entrance and exit are analyzed, and some useful suggestions for tunnel’s transition pavement structure are given in this article.
Introduction Presently, domestic research on tunnel pavement structure and material is still relatively weak, the tunnel road surface structure and material design in our country remains to apply the highway or urban road design specification.
It is improper to consider the pavement structure and materials of tunnel according to the ordinary highway or urban road design method, and it is necessary to study the design method of pavement structure and material aimed at the characteristics of tunnel entrance and exit.
<> of 12/01/1990 mentioned no detail criterion for tunnel entrance / exit transition pavement, it just required that pavement materials should be consistent with existing highway pavement design norms.
Security Investigation and Analysis Report on Highway Tunnel Pavement of Guangdong Province. 2009.10（In Chinese） [2] Xu Tao, Huang Xiaoming, Zhao Yongli: Choice of Pavement Type in Road Tunnel and Investigation Research, Journal of Wuhan University of Technology(Transportation Science & Engineering, Vol 35, No.1, Feb 2011.

Nondestructive Testing of Mechanical Properties of Pine Laminated Veneer Lumber Bing Xue1,2, Yingcheng Hu1,a 1Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, College of Material Science and Engineering, Northeast Forestry University, 150040, Harbin, China 2 Heilongjiang University of Science and Technology, 150027, Harbin, China a yingchenghu@163.com (Corresponding Author) Keywords: nondestructive testing (NDT); dynamic Young’s modulus; laminated veneer lumber (LVL) Abstract.
In spite of many alternative materials like iron, plastic, and concrete, which can be used instead of solid wood in different areas, wood remains superior as a natural engineering material.
Due to depletion of forest resources, forest products industries are faced with a crisis in obtaining suitable raw materials in sufficient amount.
Materials and Method In this study, the rotary-cut veneers used were made from pine (Pinus sylvestris L.
Liu: Wood-based Resource and Materials (China Forestry Press, Beijing 2004) [4] Y.C.

The uncertainties of the structure resistance include material properties uncertainties, geometry uncertainties and calculation model uncertainties.
Journal of Building Structures, 2001, 22(6): 81-86.
New York: Elsevier Applied Science, 1992: 95-104
Journal of Structural Engineering.
Journal of Mechanical Strength, 2002, 24(4): 524-526.

Industrial liquid waste usually contains of hazardous chemicals such as heavy metals, organic compounds and inorganic materials.
This happens because of the cohesive force including the hydrostatic force as well as the hydrogen force that reacts between molecules of all materials [7].
Experimental Materials and methods.
The materials used to prepare the bio-adsorbent was cassava stem pith powder.
Journal of Hazardous Materials, B97: 219-243

The theory using the unified mechanical model, concise mathematical expressions, flexible and applicable to various features of material, its mathematical expression is: 　 　when (1a) when (1b) ,, as the material of the principal stress; as the material of tension and compression ratio; as the shear yield limit; as the compression of material yield limit; as the tensile yield limit of materials; Ductile metal materials Generally is 0.77 ~ 1.0, brittle metal material is 0.33 ~ 0.77, geotechnical materials Generally is less than 0.5, concrete is generally 0.065 ~ 0.100. b(0 ≤ b ≤1) is reflecting intermediate principal shear stress and normal stress on the material damage on the surface of the impact of material strength parameters.
Most metal materials have obvious yield point, and the tensile strength and compressive strength are equal.
England: Elsevier Science LTD, 2005: 701- 706 in Chinese [5] ZHAO Junhai.
Beijing :Science Press，2003.87~91. in Chinese [6] Qingli Wang, Wei Gu, Yinghua Zhao.
China Civil Engineering Journal, 2005, 38( 10) : 44- 48 in Chinese

As a result, the mixture combustion process becomes unstable and explosive, which leads to the destruction of pyrotechnic products with the formation of high-temperature products (debris of product bodies, parts of mixture charges, heated to high temperatures 3000...4000 K) products of combustion of mixtures, etc.), which scatter in different directions and have a fire hazard for surrounding objects (wooden buildings, combustible and lubricating materials, launchers with service personnel and etc.) [8, 10].
Garasymiiuk, Application of gas-aerosol-powder fire-extinguishing mixtures for protection against incendiary mixtures, Scientific Journal Science Rise, 2(22) (2016) 11–14
Improvement of a discharge nozzle damping attachment to suppress fires of class D, Eastern-European Journal of Enterprise Technogies, 5 (95) (2018) 68–76
Fire and explosion hazard of substances and materials.
Vashchenko, Increasing the fire safety of pyrotechnic nitrate-metal mixtures in conditions of external thermal effects, International Scientific Journal “Intenauka”, Kyiv, (2020) № 5/5799

It becomes a study hotspot in dental materials field recently [1-3].
Experimental The materials were prepared by the conventional ceramic preparation route.
Fig. 4 shows the SEM images of fracture surfaces of the Ca3(PO4)2/ZrO2 materials (20k).
He: Foreign Medical Science.
Lu: Chinese Journal of Prosthodontics.

ASCE Journal of Materials in Civil Engineering 5 (4), 478-496
Journal of Materials Science 33 (7), 1745-1752
ASCE Journal of Materials in Civil Engineering, 11 (3), 206-213
Clark (1996), Cement-based materials containing tire rubber.
Journal of Construction and Building Materials 10 (4), 229-236

Acknowledgements This work was financially supported by the Tianjin Natural Science Foundation (13JCYBJC19600) and national natural science foundation (51208337).
[2] Mingxian He, BaocenYang and Shengxiang Huang etc: Journal of Wuhan University of Technology (Transportation Science & Engineering), v 35, n 3 ,p 516-519, 2011.
[3] Jin Sun: Journal of North China Institute of Water Conservancy and Hydroelectric Power, v 32, n 2, 2011.
[7] Wanghu Peng, Xudong Shao and Lifeng Li: China Civil Engineering Journal, v 40, n 5, p 26-33,2007.In Chinese
[8] Yongjian Liu , Jian Yang and Peng Liang etc: Journal of Chang`an University(Natural Science Edition), v29, n 5, 2009.