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The formation process of goaf was dynamically simulated by similar material simulation esperiment.
Similar material select quartz sand, river sand, mica Fig.1 Model one Fig.2 Model two aggregate, lime, gypsum, calcium carbonate cementing materials to do, take the original loess surface to be simulated, the choice to do retarder borax , borax solution access to the principle of concentration of 1.0 %.
Acknowledgements This work was financially supported by The National Natural Science Foundation (51078250).
References [1] Y.M.Lin: Simulation of experimental rock mechanics (China coal industry publishing house, Chinese 1984) [2] H.P.Xie: Introduction to Fractal and Rock Mechanics (science press, Chinese 1996) [3] X.Y.Liu and Y.B.Zhang: Journal of Taiyuan University of technology.
Vol.35 (1) (2004), p. 29, in Chinese [4] G.X.Cui: Similarity Theory and Model Experiment (China University of mining and technology press, Chinese1990) [5] M.G.Qian and J.L.Xu: Journal of coal science and engineering .Vol.23 (5) (1998), p.466, in Chinese

Investigations of Fatigue Performance of S135 Drill Pipe Steel under Uniaxial Loading Luo she-ji1,a, 2, Wang rong1, b, Zhao kang2 1School of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065,Chian 2 School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048,Chian aemail-sjluo@xsyu.edu.cn bemail-rwang@xsyu.edu.cn Keywords: tension-compression fatigue, torsion fatigue, fatigue life, S135 steel Abstract.
Materials and experiments Material and specimen The material used in this study was S135 drill pipe steel.
International Journal of Fatigue, 2005;27(10-12):1360-1365
Journal of Petroleum Technology, 1966;18(3):359-363
International Journal of Fatigue, 2004; 26(4): 575-584

Study on Non-isothermal Crystallization Kinetics of PBT with High Melt Flow Index XU Qing-Yan1,a, WANG Lin1, b, LIU Yuan1, c, GUO Zhi-Hong1, d, LIN Pei-Jie1, e, WANG Yan-Ping2, f, WANG Yi-Min2, g 1College of Material Science and Engineering, Donghua University, Shanghai 201620, China 2 State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai 201620, China aalbeexu@hotmail.com, b279246865@qq.com, cliuyuan_870629@163.com, dguozhihong_6666@126.com, elpjplover@126.com,fwyp@dhu.edu.cn gymw@dhu.edu.cn Keywords: polybutylene terephthalate; non-isothermal crystallization; dynamics; differential scanning calorimetry Abstract: The non-isothermal crystallization process of PBT with high melt flow index has been investigated by DSC, and the non-isothermal crystallization process of PBT with high melt flow index was studied by Ozawa equation and Jeziorny equation respectively.
The influence of decreasing rate on nonisothermal crystallization of PBT with high melt flow index was investigated in this paper, and the nonisothermal crystallization process was studied by Ozawa equation and Jeziorny equation respectively. 1 Experimental 1.1 Materials and Equipments The raw material is polybutylene terephthalate chips(type Celanex PBT 2008), with a intrinsic viscosity of 0.57dl/g, melting point of 224.7℃, decomposition temperature of 382.3℃ and a melt flow rate (MFR) of 154.0g/10min.
Journal of Applied Polymer Science, 2007, 104: 972-978
Chinese Journal of Energetic Materials, 2008, 6(16): 305-306
Journal of Applied Polymer Science, 1998, 67(5): 815-821

Most materials of projectile are the ferromagnetic material.
When projectile exists in geomagnetic field, these ferromagnetic materials are magnetized by geomagnetic.
Magnetization characteristic of ferromagnetic materials is shown in Fig.1.
Journal of Astronautic, 2009, 30(4): 1314-1319
Journal of Nanjing University of Science and Technology (Natural Science), 2010, 34(5): 608-612.

Dobrzański c 1Division of Materials Processing Technology and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Konarskiego St. 18a, 44-100 Gliwice, Poland a miroslaw.bonek@polsl.pl, b grzegorz.matula@polsl.pl, c leszek.dobrzanski@polsl.pl Keywords: Pressureless Forming, Tool Materials, Laser Surface Treatment Abstract.
Jonda: Materials Science Forum, Vols. 532-533, Switzerland (2006), p. 657 [4] R.M.
Torralba, Materials Science Forum, vol. 416-418 (2003) p. 369 [6] G.
Torralba, Materials Science Forum vol. 426-432, (2003), p. 4361
L.A, Dobrzański Materials Science and Engineering, vol.

Arifin3,c, Mohamad Khairil bin Roslan4,d 1-4Department of Physic, Advance Optical Materials Research Group, Faculty of Science, Universiti Teknologi Malaysia 81310, Skudai, Johor, Malaysia asyamsulaffendy@gmail.com, b*sibkrishna@utm.my, cramliarifin@utm.my, dmkhairil90@gmail.com *corresponding author Keywords: Bimetallic nanoparticles, absorption, Raman spectra, tellurite glass.
B, Manifestation of Nd ions on the structure , Raman and IR spectra of ( TeO 2 -MoO-Nd 2 O 3 ) glasses, Journal of Materials Science, 40 (2005) 3367–3373
R., & Nawaz, F, Growth of Au Nanoparticles Stimulate Spectroscopic Properties of Er3+ Doped TeO2-ZnO-Na2O Glasses, Advanced Materials Research. 895 (2014) 254–259
Journal of Alloys and Compounds. 607 (2014) 85–90
S, Structural studies of lithium boro tellurite glasses doped with praseodymium and samarium oxides, Materials Research Bulletin, 47(11), 3489–3494

V., Enabling strain hardening simulations with dislocation dynamics, Modelling and Simulation in Materials Science and Engineering 15, 6 (2007), 553-595
Investigation of point defects diffusion in bcc uranium and U-Mo alloys, Journal of Nuclear Materials 458 (2015), 304-311
G., Molecular dynamics simulations of 1/2 a screw dislocation in Ta, Materials Science and Engineering 310 (2001), 133-137
V., and Yip, S., Molecular dynamics simulations of motion of edge and screw dislocations in a metals, Computational Materials Science 23 (2002), 111-115
Asby, Progress in Materials Science 19, 19 (1975), 1.

It not only can apply for vibration compaction work between various different materials, but also realize the same material’s compaction at different compaction stages.
Acknowledgements This project is supported by National Natural Science Foundation of China (Grant No. 50905151) and Hunan Provincial Natural Science Foundation of China(Grant No. 08C869).
References [1] S.A.Billing:Journal of Sound and Vibration,Vol. 323 (2009),p.352
(In Chinese) [3] Z.W.Sun, X.L.Wei and Q.Wang: China Journal of Highway and Transport,Vol.2 (1998),p.117.
Lin : Chinese Journal of Mechanical Engineering, Vol. 9(2007),p.30.

References [1] Osamu Umezawa and Kotobu Nagai ,Deformation Structure and Subsurface Fatigue crack,Generation in Austenitic Steels at Low Temperature, metallurgical and materials transactions a, volume 29a, march 1998—809 [2] H.
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Limtrakarn, Effect of Residual Stress on Fatigue Failure of Carbonitrided Low-Carbon Steel, Journal of Materials Engineering and Performance, Volume 17(6) December 2008—879 [12] A.

Fig. 1 Specimen (a), impact-fatigue machine (b) and fixture system (c) The material properties of the skins and core materials are given in tables 1 and 2.
Guglielmino, Collapse modes in aluminium honeycomb sandwich panels under bending and impact loading, International Journal of Impact Engineering. 43 (2012) 6-15
Holzapfel, Prediction of impact damage on sandwich composite panels, Computational Materials Science. 32(3-4) (2005) 252-260
Shin, An experimental investigation on low-velocity impact responses of sandwich panels with the changes of impact location and the wall partition angle of honeycomb core, International Journal of Precision Engineering and Manufacturing. 13(10) (2012) 1789-1796
Pluvinage, Evaluation of impact fatigue damage in glass/epoxy composite laminate, International Journal of Fatigue. 32(2) (2010) 443-452