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International Journal of Material and Mechanical Engineering
   [5 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 2162-0695 - ISSN (Online) 2164-280X
     Published by Science and Engineering Publishing Company Homepage  [47 journals]
  • A Lithium-ion Full Battery with TiO2 Cathode in Molten-salt

    • Abstract: A Lithium-ion Full Battery with TiO2 Cathode in Molten-salt
      Pages 69-72
      Author Haobo SunRui MaShuqiang Jia
      A Lithium-ion full battery in molten-salt is fixed with Li-Sn as the anode, TiO2-C as the cathode and LiCl-KCl molten-salt as the electrolyte at 873 K. The XRD shows that in the discharge process, Li+ intercalated into TiO2 and TiO2 turns to Li0.5TiO2. The average voltage plateau for discharge process is 0.75 V. After 10 cycles, the discharge curve delivers a capacity of 157 mAhg-1. Even after 25 cycles, the discharge curve delivers a discharge capacity of 59 mAhg-1 with the coulombic efficiency of nearly 100%.
      PubDate: 2014-08
  • Design and Analysis of 1.2m SiC Mirror and the Support

    • Abstract: Design and Analysis of 1.2m SiC Mirror and the Support
      Pages 73-76
      Author Zhilai L
      In order to design a high stiffness and thermal stability 1.2m class space mirror, materials selection, lightweight and the support structure are taken into account in this study. By combining the excellent intrinsic thermo-mechanical properties, silicon carbide (SiC) is chosen as the material of the primary mirror and a new design with sandwich structure was proposed. Through adjusting the parameters of flexures, high stiffness and thermal environment adaptability are ensured. Detailed finite element analysis (FEA) is performed via a MSC/NASTRAN finite element model. Analysis results indicate that the surface figure reaches to 13.6nm rms under gravity and temperature effect, and the fundamental frequency is 130Hz. It can satisfy the system requirements of high stiffness and thermal stability.
      PubDate: 2014-08
  • The Effect of Tip Clearance on Aerodynamic Performance of an Axial

    • Abstract: The Effect of Tip Clearance on Aerodynamic Performance of an Axial Compressor
      Pages 77-80
      Author PI JunLIN Lian
      The performance of an axial compressor rotor for different tip clearance sizes is investigated by a numerical simulation with CFD software NUMECA. The variable quantity of the simulation is the relative tip clearance. Three different sizes are 1%, 3%, 5% of the tip chord length. The results of numerical analysis show that with the increase of tip clearance size, the performance of the compressor changes obviously, the performance parameters such as efficiency, pressure ratio tend to decrease obviously.
      PubDate: 2014-08
  • Development of Pulverized Palm Kernel Shells Based Particleboard

    • Abstract: Development of Pulverized Palm Kernel Shells Based Particleboard
      Pages 54-61
      Author R.S. Fono-TamoO.O. IdowuF.O. Koy
      The study evaluated the performance characteristic of pulverised Palm Kernel Shell (PKS)-based particleboard. The pulverised palm kernel shell was compounded with other ingredients (such as adhesive, saw dust) in the composite development phase. Standard wood-based particleboard and pulverized PKS-wood based particleboard were produced following standard procedure. The particleboards were evaluated and compared with regards to their physical, mechanical and thermal properties. Furthermore, the properties and performance characteristics of the particleboards were compared with the recommended standard. The properties of the PKS-wood based and wood-based particleboards were: 2.557 and 5.654 MPa. And modulus of rupture was 4.093 and 2.454 MPa, modulus of elasticity; 0.50459 and 0.7524 MPa, stress at proportional limit; 5.74691 and 7.14242 J, work at maximum load; 0.72 and 0.54 g/cm3, air-dried density; 10.50 and 11.89 %, moisture content; 1.705 and 3.770 MPa, internal bond strength; 0.50 and 0.13 W/mK, thermal conductivity; and 10.25 and 11.75 %, thickness swelling. This work thus established that PKS may be combined with saw dust as base material in the manufacture of standard particleboards.
      PubDate: 2014-08
  • Experimental and Analytical Investigations on Flexural Behaviour of

    • Abstract: Experimental and Analytical Investigations on Flexural Behaviour of Retrofitted Reinforced Concrete Beams with Geopolymer Concrete Composites
      Pages 62-68
      Author C.K. MadheswaranPinky merlin Phili
      Existing multi-storey buildings in earthquake prone regions of India are vulnerable to severe damage under earthquakes. So there is an urgent need for retrofitting of deficient and damaged buildings. Portland cement (PC) production is under critical review due to high amount of carbon dioxide gas released to the atmosphere and Portland cement is also one among the most energy-intensive construction material. The current contribution of greenhouse gas emission from Portland cement production is about 1.5 billion tons annually or about 7% of the total greenhouse gas emissions to the earth’s atmosphere. So retrofitting of existing deficient building using eco-friendly material which could promise higher structural performance than the original building is essential.Geopolymer concrete (GPC) is a non-Portland cement binder based on alkaline activation of industrial wastes such as fly ash and GGBS. The application Geopolymer concrete in retrofitting can reduce the production of cement and can create an ecofriendly construction atmosphere to an extent. So the feasibility of geopolymer concrete in retrofitting of damaged structures is required to be studied. This paper presents the details of the mix designs of GPC mixes, preparation of retrofitted test specimen, testing and evaluation with respect to cracking, ultimate load, deflection and failure modes. Non-linear finite element analysis of beams by 3D modeling of concrete (solid 65 element) and discrete modeling of reinforcement (Link 8 element) was carried out using ANSYS software. The load deflection characteristics, failure modes and crack patterns are obtained from the experimental and analytical studies. The results of the study indicate that the performance of retrofitted beam with GPC and control beam shows good agreement in ultimate load, failure modes and crack patterns.
      PubDate: 2014-08
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