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Air-Cooled Mn-series Bainitic Steel as 5Mn2SiNbTi of Grade YS 415 to 550MPa for Seamless Steel Pipe FENG Chun1, a, SHEN Zhao Xi1, b and ZHENG Yan Kang2, c 1 Tubular Goods Research Center of CNPC, Xi’an Shanxi, China 710065 2 Department of Materials Science and Engineering, Tsinghua University, Beijing, China 100084 afc80x@sina.com, bshengzx@cnpc.com.cn, czhengyk@tsinghua.edu.cn Keywords: Mn-series bainitic steel; Air-cooled; Microstructure; Mechanical properties; Seamless Steel Pipe Abstract.
Xu: Journal of Materials Science and Technology Vol. 21 (2005), p. 13 [5] C.
Yang: Bainite Transformation (Science Press, Beijing 1999) [8] HS.

Finite Element Analysis of the Packer at Fracturing Zhimiao LIa, Jubao LIUb, Yuqi Dingb College of Mechanic Science and Engineering, Northeast Petroleum University, Daqing, Heilongjiang Province, 163318, China alzmdq@163.com, b jslx2000@163.com Keywords: packer; rubber tube; setting; finite element Abstract: According to the working principle and structural feature of compressive packer, mechanic analysis of rubber tubes was done with adopting Mooney-Rivlin model.
Rubber Material Model Without considering the creeping of the rubber, stress-relief, Mullins effect and other characteristics related to time, the rubber is a completely hyper-elastic material.
Rivlin developed the most general form of strain energy density function by using phenomenological method from the perspective of mathematics: (5) In formula: is material constant.
Acknowledgments This research was sponsored by the National Natural Science Foundation of China (Grant No.11272085) and the Natural Science Fund for Young Scholars of Heilongjiang Province (Project No.
[4] Yang Xiujuan, Yan Xiangzhen, Jia Shanpo: submitted to Journal of Mechanical Strength(2006)

Numerical simulation of the loosening defect When the procedure of plastic processing is simulated, it is always assumed that the material cannot be compacted.
The forging process of DEFORM finite element software provided with the properties of porous material to provide the possibility of loose defect.But the material with such attributes is always used for simulating the procedure of powder metallurgy.
Ingot material is 30Cr2Ni4MoV.
International Journal of Mechanical science, 1984,102-118 [5] Xianghua Liu, Guangruan Bai.
Metal science and technology,1986,30-32

The choice of material is 20CrMo, its chemical composition (mass fraction %): C 0.20, Si 0.25, Mn 0.70, P 0.014, S 0.017, Cr 0.90, Ni 0.018, Cu 0.02.
Beijing: Science press,1996
Science and technology Journal of Wuhan University, 2009,32(1):32-35
On the Material Process Simulation COSMAP-Simulated examples and its experimental verification for heat treatment verification.
Key Engineering Materials Vols. (2007):345-346

This study presents a new mathematical model for determining the specific growth rate of biomass in biotechnological production processes, which aims to optimize the production of biotechnological products such as the advanced material polyhydroxyalkanoates.
Especially in research, material consumption, laboratory time and costs can be reduced compared to the established model.
Material and Methods Computer simulation.
Batch process at controlled pH,” Journal of Biochemical and Microbiological Technology and Engineering, vol. 1, no. 4, pp. 393–412, 1959
Molina, “Indirect estimation of Bacillus thuringiensis var. israelensis biomass concentration using oxygen balance data,” Brazilian Journal of Chemical Engineering, vol. 22, no. 4, pp. 495–500, 2005.

Fig. 1 Experiment apparatus Materials.
SPE Journal. 5(4): 295-300
Journal of Petroleum Science & Engineering. 3(1-2): 185-199
SPE Journal. 25(2): 176-190
Oil & Gas Journal, 85-89

Xi'an: Shaan xi science and technology press:1997
Journal of Highway and Transportation Research and Development, 2009,26(9):53-58
Journal of Chang'an University:Natural Science Edition, 2008,28(1):1-5
Journal of Highway and Transportation Research and Development, 2009,26(7):54-58
Journal of Desert Research,2004,24(5):657-661

Fig.1 Three-dimensional calculation model Fig.2 The center section of model 2.2 Boundary conditions setting The boundary conditions of the cube and underside hypothesis is the fixed boundary, and the upper surface of the cube (surface of soil) hypothesis is the free boundary. 2.3 Constitutive model and parameters selecting 1) The constitutive model of soil Due to the soil materials for granular materials, the stress-strain characteristics is very difficult to use elastic constitutive model to describe, the Mohr-Coulomb constitutive model is used in order to be more realistic. 2) The initial expansion of hole radius determined In order to avoid the circumferential strain of infinite phenomenon which was caused by the initial radius is zero.
Tab.1 The material parameters of soil Soil name E（MPa） （°） c（kPa） Cu（kPa） μ Soft clay 3 10 10 14 0.45 K and G is two elastic constants, and it is commonly used to describe the material properties instead of elastic modulus E and Poisson’s ratio in FLAC3D.
Weak soil compaction effect of pile design and test [J], Sichuan Building Science, 2011, Vol. 37(5):103-106
Growth of Pile Bearing Capacity over Time Considering the Dissipating of Excess Pore Pressure [J], Journal of Engineering Geology, 2012,20(5):815-820
[16] ZHAO Ming-hua, ZHAN Xin-jie, ZOU Xin-jun, Numerical Simulation of Pile Installation and Subsequent Consolidation in Clay[J], Journal of Hunan University (Natural Sciences), 2013,40(2):1-8

Design and Modeling of an Isolation Step-down Transformer by Piezoelectric Material Chen-Yao Liua and Kuo-Bin Liub National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan acyl@nsrrc.org.tw, bkbl@nsrrc.org.tw Keywords: Piezo, Resonant, Simulation Model, PWM.
Manufacture and Testing According to the physical characteristics of the piezo material, we made a prototype of a step-down piezo transformer; figure 1 shows its fundamental structure.
Isolation Material Fig 1, Prototype of the step-down piezo transformer.
According to the material reports and papers, the Qm value of a piezo transformer is large, but the resonant region is narrow.
[4] George Chryssis: High-Frequency Switching Power Supply Theory and Design, McGraw-Hill, second edition. (1989) [5] http://www.hp.com/go/components [6] Optoelectronics Designer’s Catalog, Hewlett-Packard Co., USA. (1996) [7] Chen-Yao Liu, Kuo-Bin Liu, Din-Goa Huang: Design of a Power Transformer for a LLC Resonant Power Converter, Advanced Material Research, Vol. 740, pp 823~829. (2013) [8] Chen-Yao Liu, Jhao-Cyuan Huang, Din-Goa Huang: Optimal design for a resonant power transformer”, Third International Particle Accelerator Conference, New Orleans Louisiana, USA. (2012) [9] Chen-Yao Liu, Yong-Seng Wong: Design and implementation of the LLC resonant transformer, Second International Particle Accelerator Conference, San Sebastian, Spain. (2011) [10] Yao-Ching Hsieh, Wei-Guang Chen, Chen-Yao Liu: Charge-Equalization Circuit for Series-Connected Batteries with Quasi-resonant Flyback Converters, EPE Journal, Volume 20, N°3, September, 2010, pp 34~39

PWBs consist of copper foil and insulation layers, which are composite materials composed of a glass cloth and epoxy resin.
Because materials with different physical properties are processed simultaneously, the processing phenomena become extremely complex.
[2] Arai, T., Yamamoto, K., Matsumura, K., and Kita, Y., PWB Manufacturing technology －trends of the latest PWB manufacturing technology to watch from history－, Journal of The Japan Institute of Electronics Packaging, Vol.17, No.6 (2001), pp. 38-43 (in Japanese)
[3] Kataoka, T., Challenge on New Process Using Ultra Thin Copper, Journal of The Japan Institute of Electronics Packaging, Vol.2 No.4 (2001), pp. 108-112 (in Japanese)
[4] Koji, K., Iozumi, M., Hirogaki, T., Aoyama, E. and Ogawa, K., Pulse laser irradiation control method for blind via-hole drilling of printed wiring boards based on high-speed camera monitoring, Materials Science Forum, Vol. 874 (2016), pp.285-290