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As shown in Fig. 5, the figure shows the interface crack of bimaterial materials.
For the crack of bimaterial materials, the singularity of the crack tip is in the form of .
Elastic modulus and Poisson’s ratio of the the two materials at the top and bottom of plate are and , and , respectively.
Properties of the materials are: ,,.
Conclusions The virtual crack close technique can be applied in bimaterial materials.

Pawlicki, Influence of strain on the copper structure under controlled deformation path conditions, Journal of Achievments in Materials and Manufacturing Engineering, 17 (2006) 109-112
Pawlicki, Microstructure of ultrafine-grained Al produced by severe plastic deformation, Archives of Materials Science and Engineering, 28 (2007) 385-448
Pawlicki, Microstructure of ultrafine-grained Al produced by severe plastic deformation, Archives of Materials Science and Engineering, 28 (2007) 385-448
Hollberg et al., Modeling of continous dynamic recrystallization in commercial-purity aluminium, Materials Science and Engineering A 572 (2010) 1126-1134
Hughes, Microstructure evolution, slip patterns and flow stress, Materials Science Engineering, A319 (2001) 46-54

Grinding of these hard materials is the single most important factor in the consumption of industrial diamonds [1].
Lal: Materials Processing Technology, Vol. 72 (1997), pp.61-68
Barzegari: Journal of Materials Processing Technology, Vol. 183 (2007), pp.165-168
Hintermann: Journal of Materials Science, Vol. 26 (1991), pp.5093-5100
Xu: Advanced Materials Research, Vols. 24-25 (2007), pp.233-238

The mica was chosen as the substrate materials because of its atomically flat and negatively charged surface, and mica was coated by the polylysine to absorb the DNA molecules.
Nowadays, DNA nano-technology has become the most active research area in molecular biology and nano-science.
Materials and methods Materials.
Acknowledgements The authors would like to thank the National Basic Research Program of China (2011CB707601), the Natural Science Foundation of China (50875047, 50925519, 51005048 and 51003015) and the Jiangsu Province Nature Science Foundation (BK2008201，BK2009292) for financial support. 
Baro: Biophysical Journal.

Once the material removal rate is too large, NiTi alloy has the potential to be removed in the same mode as the brittle materials, i.e. ceramics.
Heckmann: Materials Science and Engineering A, Vol.337 (2002), pp.254-263 [2] B.Y.
Petzoldt: Materials Science and Engineering A, Vol.378 (2004), pp.180-184
Catai: International Journal of Machine Tools & Manufacture, Vol.46 (2006), pp.122-131
Waida: Journal of Materials Processing Technology, Vol.48 (1995), pp.267-274.

The distribution materials are 25% glass fiber, 15% fiberglass +5% graphite and 60% tin bronze, respectively.
Table 2: Experimental data on grinding of titanium alloy plate and different PTFE pin Substrate Roughness (Ra/mm) Pin length change(mm) Average friction coefficient (total integral averaging) Average friction coefficient for stable stag (20～50min) Single specimen average Single specimen average Single specimen average For grinding materials: 15% Glass fiber +5% graphite 0.126 0.938 1.098 0.106 0.110 0.098 0.103 0.110 1.251 0.109 0.096 0.112 1.105 0.116 0.116 For grinding materials: 25% Glass fiber 0.134 1.140 1.061 0.116 0.113 0.110 0.108 0.122 0.861 0.097 0.088 0.129 1.181 0.125 0.126 For grinding materials: 60% Tin Bronze 0.115 1.407 1.273 0.122 0.119 0.119 0.117 0.202 1.055 0.115 0.116 0.113 1.357 0.119 0.116 Fig 3: Friction coefficient of titanium alloy plate and different PTFE in the process of grinding Figure 4 shows the wear of a titanium alloy plate gringding with different reinforced PTFE materials.
Ramulu, Materials & Design, 141(2018) [2] Manmeet Kaur, K.
Singh, Materials Science and Engineering: C, 102(2019) [3] H.
Falentin-Daudré, Acta Biomaterialia, 83(2019) [4] Wei Chen, Kui Wang, Yimin Gao, et.al, International Journal of Refractory Metals and Hard Materials, 76(2018) [5] Xiaojia Yang, Cuiwei Du, Hongxia Wan, et.al, Applied Surface Science, 458(2018)

Effect of pH of Coating Solution on Adhesion Strength of Hydroxyapatite and Octacalcium Phosphate Coatings on AZ31 Magnesium Alloy Tuyet Thi Anh Ngo1,2,3*, Sachiko Hiromoto2, Phong Ngoc Nguyen3, San Thi Pham3 1Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam 2Research center of structural Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan 3Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, CauGiay District, Hanoi, Vietnam *anhtuyet20379@gmail.com Keywords: magnesium alloy, calcium phosphate coatings, adhesion, delamination, biodegradable implants Abstract.
Introduction Magnesium and its alloys have attracted attention as potential biodegradable materials that do not require a second surgery [1–3].
Although magnesium alloys have been investigated as biodegradable materials for years, commercial implants are still unavailable.
Acknowledgment This paper was completed with the financial support of the International cooperative Graduate School fellowship program between the National Institute for Materials Science (NIMS), Japan, and the Vietnamese Institute of Materials Science (IMS).
[2] Shahrouz Zamani Khalajabadia,, Aminudin Bin Haji Abua, Norhayati Ahmadb, Muhammad Azizi Mat Yajidb, Norizah Bt Hj Redzuanb, Rozita Nasiric, Waseem Haiderd, Iman Noshadie, Bio-corrosion behavior and mechanical characteristics of magnesiumtitania-hydroxyapatite nanocomposites coated by magnesium-oxide flakes and silicon for use as resorbable bone fixation material, Journal of the Mechanical Behavior of Biomedical Materials. 77 (2018) 360-374

Introduction Alkali activated materials, named geopolymers by Davidovits in 1978, are a class of alumino-silicate materials based on units such as sialate, sialate siloxo or sialate disiloxo [1].
Density is an important requirement for building materials.
For example it is known that low density materials have low thermal conductivity and materials designed for fire resistance applications could be exposed to high temperature for an extended period of time.
Sun, New building materials from fly ash-based lightweight inorganic polymer, Construction and Building Materials 21 (2007) 211-217
Rossignol, Silica fume as porogent agent in geo-materials at low temperature, Journal of the European Ceramic Society 30 (2010) 1641-1648

There are mainly sandy soil (sticky heart sand, sandy bottom combined soil) and light saline-alkali soil in subsidence area, farming better, suitable large range of farming material; convenient transportation in project area,and machinery, building materials, textile, metallurgy, food, chemical and other industries with certain scale.
[3] Ren Ji zhou , Nan Zhi biao, HAO Dun yuan, The three major interfaces within pratacultural system[J], ACTA PRATACULTURAL SCIENCE, 2000, 9(l):l-8
[4] Wan Li-Qiang, Hou Xiang-Yang, REN Ji-Zhou, The application of system coupling in grassland agro-system in China[J], Chinese Journal of Eco-Agriculture, 2004.1.162-164
[8] Liao Xiao-xin,Theory, methods and application of stability [M],WUHAN, Huazhong University of Science and Technology Press,2010.1,120-130
[9] Yuan Liu-yan,Yang Gai-he,Feng Yong-zhong, Study on coupling development mode and judgment criterion of ecosystem and economic system in arid area:a case of Xinjiang[J], Journal of Northwest A & F University(Natural Science Edition), 2007, 35 (11): 41-47.

Because the nonlinear mechanical properties of rubber materials, traditional experimental methods are difficult to analyze the value of contact stress and strain quantitatively.
If the contact pressure or friction coefficient being too large, the shear stress may be more than the tear strength of rubber materials, so that the U-ring seal will be torn at this location.
Analysis of Elastomeric O-Ring Seals Using the Finite Element Method.Mechanical Science and Technology.
Journal of Beijing University of Aeronautics and Astronautics.Vol31, No.2 (2005), p. 255-260 [5] Chung Kyun, Kim and Woo Jeon Shim.
Aerospace Materials & Technology, Vol.37, No. 6, (2007), p. 15-20 [8] Chen Min, Tang Wencheng, Zhang Yifang and Zhao Chunhua.