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Its dynamical behavior is related to many factors such as the restraint stiffness of the outer-tube, the space between outer-tube and inner-tube, the properties of the materials and so on[1-4].
Therefore, the paper designs the models of double-tube BRBs with contact rings by employing the general materials, experimental equipments and conditions in existence and carry out an experimental research on the dynamical behavior of these models.
The material of the testing members is structural steel Q235.
The Properties of Materials.
The materials of members are incised and processed to be standard members with three members in each group.

The cutting materials were hardened steel Cr12MoV and GCr15 whose hardness is HRC50-52 and HRC62-64.
Introduction As main processing materials in machinery industry, Hardened steel is widely used in the manufacturing of automobile, bearings and gears.
The experiments were performed on CNC lathe CAK4085 with PCBN tool, where the cutting materials were hardened steel whose hardness are HRC50-52 and HRC62-64.The experimental device can be seen in Fig. 2.
Lin et al: Journal of Graphics. 2014,35(1), pp.52-56
Xiong: JOURNAL OF SICHUAN UNIVERSITY.2014,46(3), pp.142-146.

All the materials were used without further purification.
Material chemistry and physics 125 (2011) 231
Iranian Polymer Journal. 20 (7) (2011) 579-586
Tareev, B., Physics of Dielectric Materials, MIR Publications, Moscow. 1979
International Journal of Electrochemical Science 3 (2008) 282 – 290.

Advanced battery materials.
Materials Review, 2006, 20 (S1): 285-287 [3] Yongli Fan, Zhiyuan Tang, et al.
LiCo1/3Mn1/3Ni1/3O2 as cathode materials of lithium-ion battery.
Research progress in the cathode materials of lithium ion battery .
Journal of Functional Materials, 2004, 35 (6): 667-671 [8] Xueshan Hu, Xingquan Liu.

Impacts of wetting agents such as CaLS, NP-7 and MC on density separation of plastics are related not only to the molecular structure of plastic materials but also to the separating media.
Recycling of waste plastics requires high purity of raw materials and more than 5% of impurities in materials will greatly affect the performance of recycled products.
Experimental Materials and Methods Materials.
Applied Mechanics and Materials, 2014
Chinese Journal of Applied Chemistry, 2008, 25(4): 401-404.

Shang d School of materials science and engineering, University of science and technology Beijing, Beijing 100083 China a wxm@mater.ustb.edu.cn, b hexl@mater.ustb.edu.cn, cyangsw@mater.ustb.edu.cn, d cjshang@mater.ustb.edu.cn Keywords: Ultra-fine bainitic steels, Relaxation-precipitation-controlling phase transformation (RPC), Refinement Abstract.
Naval Engineers Journal, Vol. (1990), P.63 [4] H.
Chinese Journal of Materials Research.
Journal of University of Science and Technology Beijing, Vol.11(2004), p.221 [7] Shang Chengjia, Wang Xuemin, Yang Shanwu, He Xinlai, Wu Huibin, Acta Metallurgica, Sinica.Vol. 39(2003), p.1019 [8] X.
He, Materials Science Forum, Vol. 426-432 (2003), p.1307 [11] S.Yang and X.

To define a cyclic material properties, the combined hardening model is adopted.
Results from more parametric studies for different materials and various specimen geometries will be reported later.
Vaze and H.S Kushwaha, Effect of cyclic loading on elastic-plastic fracture resistance of PHT system piping material of PHWR, International Journal of Pressure Vessels and Piping, Vol.80, p. 745, 2003
Murty, A study on the decrease of fracture resistance curve under reversed cyclic loiadng, International Journal of Pressure Vessels and Piping, Vol.77, p. 303, 2000
Kim, J-R Fracture Toughness of Nuclear Piping Materials under Excessive Seismic Loading Condition, Engineering Fracture Mechanics, PVP2016-63456, 2016.

Kou 1,c 1 Department of Materials Science and Engineering, University of Wisconsin, Madison, WI 53706, USA a chenche.huang@msa.hinet.net, bgcao@wisc.edu, ckou@engr.wisc.edu Keywords: Liquation cracking, welding, GMAW, circular patch test, fraction solid, aluminum alloys, 1100, 4043, 2024, 7075.
Kou, Welding Journal, vol. 85, 2006, pp. 9s-18s
Kou, Welding Journal, vol. 82, 2003, pp. 184s-194s
Kou, Science and Technology of Welding and Joining, vol. 9, 2004, pp. 1-9
Kou, Welding Journal, vol. 83, 2004, pp. 50s-58s

Journal of Composites Science and Technology, 66: 723-730
Proceedings of International Symposium on Aircraft Materials ACMA2014.
Computational modelling of impact damage in brittle materials.
Materials Science and Engineerging, A125, 203-213
Journal of Electronic Materials, 37(3):339-346

Experimental section Materials.
Tao: Journal of Polymer Science Part A: Polymer Chemistry, Vol. 47 (2008), p. 137-148 [6] H.
Lin: Journal of Polymer Science: Part A: Polymer Chemistry, Vol. 48 (2010), p. 4823-4834 [7] N.S.
Woo: Advanced Materials Research, Vol. 418-420 (2012), p. 153-158 [10] D.S.
Chen: Journal of Polymer Science: Part A: Polymer Chemistry, Vol. 45 (2007), p. 5266-5276 [12] M.