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  • 1
    Electronic Resource
    Electronic Resource
    A Study on Material Flow in Combined Extrusion Process (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 3061-3064 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper deals with an analysis of material flow in an extrusion process with a divide flow. The billet material flows easily into the corners of the die cavity and/or the material flow is controlled by the help of the ratio in reduction area, thikness ratio of backward can thickness to forward can thickness. So the influences of this tool geometry and process condition on balanced material flow in a combined forward and backward can extrusion process are explained. The FEM simulation has been conducted in order to investigate the effect of process parameters such asthickness ratio on the material flow. Deformation pattern and flow characteristics were examined in terms of design parameters such as extruded length ratio etc. Based on the simulation results, die pressure exerted on the die-workpiece interface is calculated and anaylsied for safe tooling. Therefore the numerical simulation works provide a combined extrusion process of stable cold forging process planning to avoid the severe damages on the tool
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.3061.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Surface Characteristics on Polystyrene/Clay Nanocomposite via Emulsion Polymerization (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 111 (Apr. 2006), p. 187-190 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Polystyrene/clay nanocomposite with organically modified montmorillonite wassynthesized via emulsion polymerization. Organic styrene monomer was first intercalated into intergalley of the clay hosts, followed by a typical emulsion polymerization with surfactant and initiator. To investigate the effect of clay loading, we also prepared PS/clay nanocomposites with different clay contents. Wide angle X-ray diffraction (XRD) and transmission electron microscopy(TEM) showed that the emulsion polymerization of PS in the presence of clay produces partially exfoliated and intercalated nanocomposites. In order to study their rheological properties, the melt pallets of composite materials were prepared and measured via a rotational rheometer with a parallel plate geometry
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.111.187.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of PP/Organoclay Nanocomposites with Maleic-Anhydride (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 119 (Jan. 2007), p. 203-206 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Polypropylene (PP)/organoclay nanocomposites were prepared via a melt-mixing methodthrough two-step melt compounding using a co-rotating intermeshing twin screw extruder. Maleicanhydride grafted polypropylene (PP-g-MA) was adopted during compounding as a compatibilizer.Structural investigations via X-ray diffraction (XRD) and transmission electron microscopy (TEM)revealed the intercalated morphology of the nanocomposites. The use of PP-g-MA led to not onlygood clay dispersion but also heterogeneous intercalation. Thermal degradation of the PPnanocomposites was studied by thermogravimetric analysis (TGA). Rheological properties of thePP/organoclay nanocomposites were also investigated via a rotational rheometer in which linearviscoelastic measurements were performed in oscillatory shear with small strain amplitude. Storage(G’) and loss (G”) moduli were found to be increased at all frequencies with increasing clay contents
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.119.203.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Rheological Characteristics of Solvent-Cast Poly(e-Caprolactone)/Organoclay Nanocomposite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 1455-1458 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: As an effective way to enhance various properties of polymer, polymer/clay nanocompoisteis being adopted since it can hybrid the properties of the two components, showing superior physicaland mechanical properties. In this study, poly(ε-caprolactone) (PCL) nanocomposites using anorganoclay were prepared by a solution intercalation method, and their unique internal structures andrheological properties induced by the presence of organoclay at nano level were studied using WAXDand a rotational rheometer
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.1455.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of Layered Silicate on Nanoscopic Internal Structure and Morphology in Polymer Blend (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 1205-1208 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Organically modified layered silicate was introduced into miscible poly(ethylene oxide)(PEO) / poly(methyl methacrylate) (PMMA) blends for the synthesis and characterization ofpolymer/clay nanocomposite through solvent casting method. As a part of our continuous efforts onthe study of nanoscopic internal structures and changes of material properties caused by the presenceof organically modified layered silicate, we systematically investigated the characteristicmorphological changes and internal structures with scanning electron microscope (SEM) andtransmission electron microscopy (TEM). Various factors such as clay concentration, thermal history,and shear history were employed to give rise to the changes of morphological and internal structures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.1205.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetorheological Characterization of Polymer-Iron Composite Suspensions (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 1201-1204 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Composite particles (CIPMMA) of carbonyl iron (CI) and poly (methyl methacrylate)(PMMA) were prepared by a suspension polymerization method using CI dispersions in MMAmonomer, and these were adopted as dispersed phase of magnetorheological (MR) fluids. TheCIPMMA can resolve several problems of MR fluids having CI alone such as severe sedimentationand poor dispersion stability. Flow and viscelastic properties of the MR fluids were analyzed via arotational rheometer equipped with a magnetic field supplier using measuring system of a parallelplate. The MR characteristics like yield stress were affected by the CI contents in the compositeparticles
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.1201.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    A Study on the Process Design of Cold-Forged Automobile Parts (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 105-108 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The cold forging processes of automobile parts such as piston-pin, valve-spring retainer(VSR) and power-assisted steering part (PAS) are analyzed by the rigid-plastic finite element method. The results of the simulation on the piston-pin are summarized in terms of the strain distribution and load-stroke relationship. Based on the analysis on the current processes of VSR and PAS, the new novel processes for improving the conventional process sequences are designed. As a design criterion, the improved processes satisfy the new condition such as an initial billet size, the production time and the limit value of forming load and pressure etc. The present simulation results and the newly developed process gave rise to an improvement in manufacturing processes for cold-forged automobile parts. Furthermore, the numerical analysis for the processes in this study provides a newdesign concept for forming processes and a basis for the selection of forging equipments
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.105.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Numerical Analysis on the Dissimilar Channel Angular Pressing by Multi-Pass Rolling (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 101-104 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The dissimilar channel angular pressing (DCAP or CCSS) based on the equal channel angular pressing (ECAP) was numerically modeled and analyzed by means of a rigid-plastic two-dimensional finite element method. Multi-pass rolling is performed in two different manners; the feeding direction of samples into the DCAP-channel is maintained in Route A and the feeding direction is reversed in the Route B. The deformation of AA1100 sheets during the DCAP process comprises three distinct processes of rolling, bending and shearing. The shear deformation of anamount of 0.5 was concentrated at the corner of the DCAP-channel where the abrupt change in the direction of material flow occurred. Because differences in the shear deformation in Route A and Route B led to the different strain states throughout the thickness of the aluminum sheet, the strain history in the DCAP-channel was analyzed in various thickness layers by the shear and effective strain components
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.101.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Finite Element Method in Powdered Metal Compaction Processes (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 109-112 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A finite element method for the compaction process of metallic powder is introduced in the present work. Basic equations for the finite element formulation are summarized. A yield criterion, which is modified by describing asymmetric behavior of powder metal compacts, is introduced and applied to various classes of powdered metal compaction processes. Three material parameters are involved in the yield function and determined from the behavior of sintered powder compacts as a function of relative density. The FEM simulation includes single-action and double-action pressings of solid cylinders as well as cylindrical rings of relatively long parts (Class II parts). The compaction process for multi-level flanged components (Class III and Class IV parts) is also analyzed. The predicted results from simulations are summarized in terms of density distributions within the compacts and pressure distributions exerted on the die-wall interfaces, and also in terms ofeffectiveness with increased relative motions with in the compacts and the effect of various compaction schemes of combination of punch motions. Results obtained in the multi-level compaction process are discussed in terms of average relative density distributions at each height
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.109.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Facile Synthesis of Conducting Polypyrrole/Non-Aggregated Magnetite Nanocomposites and their Magnetorheological Characteristics (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 201-204 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Large density of the dispersed phase in magnetorheological (MR) fluids has hinderedoperating MR test and their industrial application. This present work adopted Fe3O4 nanoparticles toprepare MR fluid because of their moderate density and good magnetic property. Furthermore, inorder to resolve aggregation problem of Fe3O4 particles due to their nano-scaled size, conductingpolypyrrole (PPY) was synthesized around naono-sized Fe3O4 particles via conventional oxidationpolymerization. Weight ratio of PPY to Fe3O4 was adjusted to be 5% to avoid possible deteriorationof the magnetic property of Fe3O4 particles. TEM images described the morphology for PPY-Fe3O4,and XRD pattern provided information on structural characterization and particle size. Finally, MRperformances of pure Fe3O4 and PPY-Fe3O4 nanocomposites were investigated via rotational andoscillatory tests
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.201.pdf
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