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According to the unified strength theory, eight kinds of expressions of the strength criterion can be applied to various kinds of geotechnical materials [3].
The Unified Strength Criterion of Rock and Soil Materials Mathematical expressions for geotechnical materials unified strength theory is : (1) In which, ， ， is the angle of internal friction of pile soil, c is the cohesion of the soil around pile, b is reflect the intermediate principal shear stress and normal stress on the surface of the corresponding effect on the material damage influence degree coefficient.
Yu, The Unified Strength Theory of Rock and Soil Materials and Applications, Journal of Geotechnical Engineering, 2 (1994) 1-10
Zhang, Theoretical analysis on compaction effectiveness of liquefiable foundation by pebble columns, China Safety Science Journal, 6 (2005) 77-79
Chen, Unified Limit Solution of thick wall cylinder subject to external pressure considering strain softening, Journal of Hunan University (Natural Sciences), 2 (2006) 1-5.

Methodology Materials.
Endthen, “Material value conservation: Development of design criteria for rigid plastic packaging,” Material Science Forum, vol. 936, pp. 110-115, 2018
Brydson, Plastics materials, 4th ed., London: Butterworth Scientific, 1982
Hapsari, “Plastic packaging material value conservation and the structure of stakeholder role”, Key Engineering Materials, vol. 773, pp. 396-404, 2018
Jeremia, “Plastic packaging material value conservation and evident of the consumers acceptance”, Key Engineering Materials, vol. 773, pp. 390-395, 2018

Shape Memory Alloys (SMA) are smart materials that have attracted increasing attention due to their superior damping properties when compared to conventional structural materials.
Differently from active materials, the classical engineering materials have only structural functions when used in mechanical systems.
Zhao: Materials Science and Engineering A Vol. 394 (2005), pp. 78-82
Van Humbeeck: Journal of Alloys and Compounds, Vol. 355 (2003), Issues 1-2, pp. 58-64
Gonzalez: Journal of Materials Processing Technology, Vol. 209 (2009), pp. 3657-3664.

Besides, the long-term durability of CFRP is an important factor in successful application as repair materials for concrete.
NSC 99-2221- E -035-084 by the National Science Council, Taiwan, R.O.C.
Bradford: Construction and Building Materials, Vol.9, No.2 (1995), p.115
Farschman: Construction and Building Materials, Vol. 9, No. 3 (1995), p.141 [11] H.A.
Gupta: ACI Materials Journal, November-December (2000), p.703

Materials Science and Engineering: B, 2012. 177(2): p. 269-273
Critical reviews in solid state and materials sciences, 2014. 39(1): p. 46-80
Materials Science and Engineering: B, 2004. 106(3): p. 269-274
Journal of Magnetism and Magnetic Materials, 2010. 322(21): p. 3470-3475
Journal of magnetism and magnetic materials, 2014. 366: p. 44-49

Fabrication and Characterization of Nanocrystalline NiO Prepared by Sol-Gel Process Yu Cai1,a, Zhaoyang Wu2,b, Shengli Zhao2,c and Jine Zhu2,d 1Institute of Information management, Henan University of Science & Technology, Luoyang, Henan, 471003, China; 2School of Materials Science and Engineering, Henan University of Science & Technology, Luoyang, Henan, 471003, China ahappycaiyu@163.com, bwuzhaoyang870203@126.com, cslzhao@mail.haust.edu.cn, djine0736@163.com Keywords: Nickel Oxide; Nano-Crystalline; Sol-Gel.
Among lithium ion battery anode materials, the traditional carbon graphite anode materials are widely used but it can’t staisfy the requirement of high capacity, so more and more researchers pay their attentions on searching for materials owning high capacity and stable performance.
Liu: Materials Science Vol. 270 (1995), p. 590
Yu and S M Li: Journal of Materials Engineering, zl(2006): 110
Shen: Journal of Inorganic Materials.Vol. 19(2004), p. 289

Study on mechanical properties of wood plastic composites Huang fang Eastern Liaoning University, Chemical Engineering and Materials Science, Liaoning Dandong 118000 3x.931@163.com Key words: composite material; mechanical properties; research Abstract.Composite material has many excellent properties, current, receives special attention was paid to its mechanical properties.
Composite materials are often called fiber ( or other dispersed phase) reinforced composite materials.
Experiments show that, the ratio of raw materials on the properties of the composite materials affected greatly.
This shows that rely on increase the dosage of solvent to improve the mechanical properties of materials is limited.
Journal of Reinforced Plastics and Composites, Vol 11, April 1992 [9]Vares T, Reiska R.

Introduction Tribology is one of the key points in industrial application of ceramic materials, and also the pivot of ceramic materials research.
Different TiB2 contents will significantly affect density of the material, and then the density directly affects the mechanical properties of materials.
Although the additive of TiB2 could improve the friction and wear properties, the high TiB2 content also affect the microstructure of materials and the surface of materials was easy to be broken, and is bad for the friction and wear properties.
JQ201014), the National Natural Science foundation of China (Grant No. 51075248), Shandong Provincial Natural Science Foundation, China (Grant No.
Zhong: Lubrication Engineering Vol. 31, (2006), p. 157 (in Chinese) [5] B.Basu: Journal of Materials Science Vol. 39 (2004), p. 6389 [6] W.J.

The experimental results show that the new cropping process can crop bars with different materials and diameters.
However, these cropping machines have many defects like low productivity, high energy-consumption, materials waste and noise pollution.
The cropping machine can manufacture bars with different materials and diameters.
The new manufacturing precision cropping process is green, which can crop bars with different materials and diameters and get high-quality cross-section.
[2] Chen Jin-De, Yu De-Hong, “Plastic Precision Cropping of Metal Materials,” International Journal of Machine Tools and Manufacture, 32 (3), pp. 425, 1992

., College of Materials Engineering, University of Babylon, Iraq. 2Faculty of Science, King-Abdul-Aziz University, Jeddah, Kingdom of Saudi Arabia. 3Ass.
Mohd Ali, Firdosa Nabi " Anti-corrosion Ability of Surfactants: A Review " International Journal of Electrochemical Science, 6 -1927 – 1948, 2011
Fatai Olufemi " Corrosion Inhibition of AISI/SAE Steel in a Marine Environment ", Metallurgical and Materials Engineering Dept., Leonardo Journal of Sciences, p. 47-52 , ISSN 1583-0233, 2009
Mathur Gopalakrishnan '' Natural products as corrosion inhibitor for metals in corrosive media — A review '' Materials Letters 62 , 113–116, 2008.
Roos ," Corrosion Studies of C38 Steel by Alkaloids Extract of a Tropical Plant Type " International Journal of Electrochemical Science, 4095 – 4113, September , 2011.