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Micro relative motion amplitude is small, its cause material injury usually appeared in two forms: Micro lead to wear: micro between the surfaces can cause surface wear, produce the material loss and component size change, cause member bite, loose, power loss and noise increase or formation pollution sources.
Various kinds of applied alternating load produce micro, can cause material wear and fatigue crack formation, resulting in the thread loosening, bite dead, fracture or fittings fatigue life down.
In view of the above factors, in order to improve pipe thread sealing performance, the actual should be paid attention to in the application from three ways: enhance the internal and external thread type and size of the processing requirements, make its as far as possible consistent, but there are certain limit, namely in the economic and the possible conditions guarantee in a certain tolerance range; inside and outside threaded and after, through some tightening torque make internal and external thread itself materials produce certain deformation to fill a part of the clearance; between the inner and outer thread has plasticity to join the packing.
Acknowledgements This work was financially supported by the Science Foundation of Huuaihai Institute of Technology, (Grant No,Z2009007).
References [1]X.C.Li,Y.Z.Hao: MACHINERY MANUFACTURING ENGINEER, 3(2000),p.32-33 [2] X.C.Li: OIL-GASFIELD SURFACE ENGINEERING,9(1999),p.58-60 [3]J.B.Liu,E.Zhang,S.Y.Wang: Journal of Daqing Petroleum Institute,2(2006),p.51-53 [4] D.Y.Ying: PROCESS EQUIPMENT & PIPING, 3(1999),p.44-49 [5] D.Y.Ying: PROCESS EQUIPMENT & PIPING, 4(1999),p.43-48 [6] L.X.Gao,Y.Jin: Journal of Shanghai Jiaotong University,10(2004),p.129-132

Materials Today: Proceedings, 2019. 18: p. 4738–4744
International Journal of Thermal Sciences, 2018. 129: p. 504-531
Journal of Mechanical Science and Technology, 2018. 32 (8): p. 3975–3982
Journal of Dispersion Science and Technology, 2014. 35(5): p. 677–684
Journal of Mechanical Science and Technology, 2017. 31(7): p. 3317–3328

Whyte [3] identified wood, concrete, bricks, and metals as major materials generated in construction sites.
This method is suggested by Whyte [3] for any material that cannot be counted directly.
Zaharuddin, Quantification of waste in conventional construction, International Journal of Environmental Science and Development. 4 (2013), 296–299
Apte, Waste minimization of construction materials on a bridge site (Cement and reinforcement steel) - A regression and correlation analysis, International Journal of Engineering and Innovative Technology (IJEIT), 2 (2012), 6-14
Johari, M.N Adlan, Identification and the quantification methodsuggested for the major types of waste generated in the Malaysian housing construction sites, Journal of Applied Science and Agriculture, 9(21) Special 2014, 46-51

And the study method and the mechanism of rubber cutting can be applied to other viscoelastic materials' cutting process.
Aknoledgements: This work is funded by the Foundation of Shanghai Automotive Science and Technology Development (2348A).
Zhang: International Journal of Mechanical Sciences Vol. 44(2002), p.2317 [3] Rivlin R.S.: Phil.Trans.Soc.Vol.240(1948),p.259 [4] A.R.
Lake, O.H.Yeoh: International Journal of Fracture Vol.14(1978), p.509 [6] G.J.
Lake, O.H.Yeoh: Journal of Polymer Sience:Part B:Polymer Physics Vol.25(1987), p.1157 [7] A.N.

The assignment is using Drucker-prager elastic-plastic constitutive model for vertical load to analysis the interface behavior between soil and pile materials.
[2] Renpeng Cheng: Guoqian Lang: Journal of Zhejiang University (Engineering Science), Vol.36 (2002), No.6, p668 (In Chinese)
[3] Xiaonan Gong, Mingzhong Chen: Civil Engineering Journal, Vol.34 (2001), No.4, p54 (In Chinese).

Study on the surface modification and dispersion of multi-walled carbon nanotubes Guan-hui GAO1, a , Shou-gang CHEN 1, b , Rui-ting XUE 1, c, Yan-sheng YIN 1,* 1 Institute of Materials Science and Engineering, Ocean University of China, Qingdao, China aemail: ggh___001@163.com bemail: sgchen2009@yahoo.com cemail:xuert@163.com *Corresponding author email: yys2006@ouc.edu.cn Key words: modification; MWNTs; carboxylic groups; dispersion Abstract: The potential applications of carbon nanotubes are reviewed in this paper.
Modified carbon nanotubes provide nano-materials to the physics, biology, materials and other related fields.
Science.
Journal of Applied Polymer Science.
Journal of Applied Polymer Science.

Whereas under standard atmosphere, the weak ionization in air wouldn’t occur till the temperature arrives at 6000K, obviously beyond the thermal limits of available materials, and the velocity of vehicle need to achieve 12Ma in order to attain the corresponding temperature in inlet.
However, currently, available cryogenic superconducting materials require complicated cooling system and operating condition of low temperature which is uncomfortable for MHD applications.
At the same time, High-temperature superconducting materials are under testing, and may be realized commercially in the near future [11].
AIAA Journal, vol.42, pp. 2303-2310, 2004
AIAA Journal, vol.40, pp.74-81, 2000

As an optically active cyclitol, L-Quebrachitol has only recently emerged as a new important chiral building block to be used as a starting material for the synthesis of a wide variety of bioactive materials and most notably inositol pharmacy.
Materials and Methods Chemicals and Reagents.
Jerome: European Journal of Lipid Science and Technology, 110(2008), p.563
Goh: British Journal of Dermatology, 153(2005), p.954
Ao: Journal of Yunnan Agricultural University, 04(2005), p.467

Therefore, it is important to study the fatigue damage of metallic materials with plastic deformation [6].
The objective of this paper is to study the formation, expansion and fracture process of fatigue crack of metallic materials under plastic hardening using fractal and catastrophe theory.
Acknowledgements This work was financially supported by the Natural Science Foundation of China (10802015) References [1] B.
Akagi: Fatigue & Fracture of Engineering Materials & Structures Vol. 25(8-9) (2002), p.831-835
:International Journal of Fatigue Vol. 29(9-11) (2007), p. 2072-2078

Its design method can be put into use of home textile material, dress and dress material design.
AUTEX Research Journal, 2003, 3(4): 173-179
Journal of Donghua University ( Eng.
Journal of Textile Research, 2008, 28 (4): 53-56.
Journal of Textile Research, 2007, 28 (10): 34-37.