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Introduction The non linear viscoelastic behaviour of polymer materials is still difficult to describe with reasonably accurate but nevertheless practical models.
In the present study, a physical model is developed to describe the creep compliance of polymer materials (applicable to both amorphous and semi-crystalline polymers), at varying tensile stresses and ambient temperatures. 2.
D(t) ≠ f(t).g(σ) and (4) it yields very good agreement with the experimental data, as well as meaningful parameter values in terms of the physical mechanisms (at the molecular scale) responsible for the behaviour of a wide range of viscoelastic polymer materials.
Literature References [1] P.Feltham: British Journal of Applied Physics, Vol. 6 (1955), p. 26 [2] J.
Pinto, Materials Science Forum, (2003), [in press] [3] J.

., 30, Tomsk, 634050, Russia 2 Institute of Strength Physics and Materials Science SB RAS, Akademichesky ave., 2/4, Tomsk, 634021, Russia 3 S.P.
On the formation of onion rings in friction stir welds, Materials science and engineering: A. 327 (2) (2002). 246-251
Taylor, Microstructural studies of friction stir welds in 2024-T3 aluminum, Materials science and engineering: A. 323 (2002) 160-166
Shear flow and formation of Nugget zone during friction stir welding of aluminium alloy 5083-O, Materials Science and Engineering: A.
Kailas, The role of friction stir welding tool on material flow and weld formation, Materials Science and Engineering.

Experimental Material and Methods Equipment.
Material.
Acknowledgements This work was financially supported by Key Research Lab for Brazing Materials and Technology of Zhejiang Foundation (1003).
The authors would like to thank Chuanyong Hao and his colleague from Institute of Metal Research, Chinese Academy of Science.
Journal of Oil University, 2000, (5): 80-83.

The essence of this type of welding is that, plastic materials are connected not in the liquid (molten) phase.
This tube simulates the material of the plates to be welded.
Cheeseman, Modeling of AA5083 Material Microstructure Evolution During Butt Friction-Stir Welding, Journal of Materials Engineering and Performance.
Materials Science Forum, ISSN: 1662-9752, Trans Tech Publications Ltd., Switzerland.
Series: Materials Science and Engineering.

Design of docking probe based on dynamics model of flexible beam impact Xiang Zhang, Yiyong Huang, Wei Han and Xiaoqian Chen College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China E-mail: zx_study@163.com Keywords: flexible beam; impact dynamics; probe-cone docking mechanism; optimization Abstract.
Chen, The oblique impact dynamic study for a flexible beam undergoing large overall motion, Journal of Mechanism, 32 (2000).
Liu, Study of dynamics model and control of a flexible beam, Journal of Vibration Engineering, 11 (1998).
Li, Advanced Dynamics of Structures, Science Press, Beijing, China, 2010

Model solution and analysis In order to make the material real, we need to assign material properties, excitation source and boundary conditions.
Journal of Astronautic Metrology and Measurement.
Journal of Chongqing University( Natural science edition).

References [1] Jun-song Li, Zhong-kang Song: Auto Electric Parts Vol. 41(2002), p. 13 (In Chinese) [2] Shu-xian Qiu: Journal of Changchun University of Techonology (Natrual Science Edition) Vol. 31(2010), p. 319 (In Chinese) [3] Zhengkun Qin, Shuyuan Li,Chunwu Wang,Guofeng Wang: Advanced Materials Research Vol.744(2013),p. 487 [4] Zhen-rong Cao, Bai-rong Cao: Control & Automation Vol.23 (2007), p.184 (In Chinese) [5] Yungui Shi, Yujie Sun, Weili Jiang: Chinese Journal of Scientific Instrument Vol.27 (2006), p. 531 (In Chinese) [6] Qing Guo, Yuan-Xi Wang: Transducer and Microsystem Technologies Vol. 30(2011), p. 54 (In Chinese)

Applying this non-Newtonian fluid model, the lubrication performances have been investigated for different kinds of squeeze films, such as the synovial joints by Ahmad and Singh [3], the journal bearings by Lin et al. [4], the sphere-plate films by Naduvinamani et al. [5], the cylinder-plate mechanisms by Lin et al. [6], the parallel circular disks by Bujurke et al. [7], and the parallel rectangular stepped plates by Kashinath [8].
In accordance with the micro-continuum theory of non-Newtonian fluids of Stokes [2], the momentum equation, the continuity equation and the equation for squeezing motion can be written as (3) (4) (5) In these equations, denotes the fluid density, is the pressure, is the viscosity, is the material constant for a couple stress fluid, and are the fluid velocity in the and directions respectively.
Acknowledgements This study is supported from the extension of the support by the Ministry of Science and Technology of Republic of China: MOST 103-2221-E-253-001-.
Suntiwattana, Effect of oil additives on the performance of a wet friction clutch material, Wear 181-183 (1995) 850-855
Yang, R.F, Lu, Effects of couple stresses in the cyclic squeeze films of finite partial journal bearings, Tribol.

The big gear tooth profile error is set to zero too, and the function value of pitch error is for: （3） The gear structure is shown in Figure 1 Figure 1 The schematic diagram of gear meshing 3.2 The law of tooth deformation under load Because the gear materials are flexible, the tooth will occur to contact deformation and bending deformation under load, it is decide by gear meshing stiffness.
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 1999. 213(4): p. 389-400
A new calculate model of gear transmission error, Journal of Mechanical Transmission,2008，（6）,13～14 [6] Kuang, J.H. and Y.T.

Shen: Advanced Materials Research Vol.154- 155 (2011), p.1305 [2] H.
Shin: Journal of Manufacturing Science and Engineering Vol.1 (2004), p.126 [3] H.T.
Kim: International Journal of Advance Manufacturing Technology Vol.19 (2002), p.449 [5] X.B.