Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Fabrication of C〈sub〉sf〈/sub〉/Mg Composites Using Extrusion Directly Following Vacuum Infiltration - Part 1: Monitoring and Acquiring of Process Parameters (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 85-89 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Many process parameters are involved during the fabrication of Csf/Mg composites usingextrusion directly following vacuum infiltration. The selection of suitable process parameters isimportant for the successful fabrication of composites. This will require a continuous monitoring andcollecting system of process parameters. This paper describes how this is performed. The monitoringand collecting system is developed to monitor and control the forming process successfully. Thehardware was built with data acquisition (DAQ) card based on PCI and various sensors fortemperature, pressure, displacement. The industrial computer is used to process the data collectedfrom the sensors. The data acquisition card is the bridge between the computer and sensors. In order toreduce the signal noise from sensors, the hardware filter circuit is designed. The data acquisition cardcan not work by connecting the computer and sensors through it simply. It must be operated throughthe self-developed software. The data colletcing software is developed in this paper. It can realize theparameter monitoring and collecting easily by setting up the hardware through the user friendlyinterface. The curves of parameters can be displayed on the computer screen and the data can be savedinto the database for post-processing. The software also supplies the warning function. When theparameters (for example the temperature of mold) arrives the set value, the computer can sound a noteof warning to tell the worker to operate the press. It is demonstrated that the main parameters, such astemperature of mold and liquid metal, the loaded pressure and the displacement of punch, can bemonitored and collected in real-time by use of this system. This paper found the base for the furtherselection of optimized process parameters
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.85.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Fabrication of C〈sub〉sf〈/sub〉/Mg Composites Using Extrusion Directly Following Vacuum Infiltration - Part 2: Forming Process Study (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 91-96 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Extrusion directly following vacuum infiltration is a special forming technique thatcombines the advantages of liquid metal infiltration and semisolid extrusion. The major advantages ofthis process are elimination of porosity and shrinkage, good surface finish, good dimensionalaccuracy, high strength to weight ratio and near net shaping. Magnesium matrix composites arefabricated usually through stirring casting, powder forming, injecting deposition, liquid metalinfiltration or die casting at present time. However few investigations on magnesium matrixcomposite are conducted for the specific characteristics of magnesium alloy, such as high chemicalactivity and easy oxidation. The present paper is focused on Csf/Mg composites obtained viainfiltration of porous short carbon fiber preform by liquid Magnesium. The complete experimentsetup is designed and fabricated by ourselves, which include the forming molds, the unit for meltingthe magnesium, the unit for vacuuming and the monitoring and collecting system of forming processparameters. In this method the whole experiment setup is vacuumed firstly. Then the pressurizednitrogen is used to infiltrate the magnesium melt through a porous preform of short carbon fibers.After the infiltration completed, the punch of the press extrude the magnesium-infiltrated preform outof the forming die to form the tubes or bars. X-ray diffraction (XRD), optical and SEM microscopeswere used to characterize the infiltration and the microstructure of fabricated composites. Thecompression test was used to characterize the mechanical properties of fabricated composites. Theresults show that the preform was infiltrated thoroughly by melt magnesium and the fabricated Csf/Mgcomposites have excellent mechanical properties compared with the magnesium alloys. Csf/Mgcomposites should be very promising candidates for automobile parts and portable electronicappliance parts in the future
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.91.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Heat and Mass Transfer of the Infiltration in Liquid Infiltration Extrusion Process (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 953-956 
    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 pressure infiltration process of porous preforms by molten metals was investigatednumerically in this paper. The finite element model of heat and mass transfer of the infiltration inliquid infiltration extrusion process was founded by the introduction of a new continuum model offluid in porous medium and a distribution resistance concept. The proposed model can describe thetransient flow behavior of semisolid materials qualitatively. Numerical simulations were developed inparticular for non-isothermal infiltrations which take into account the thermal aspects (the mould, thefibres and the metal are initially preheated at different temperatures). The temperature distribution,infiltration front and infiltration depth in the infiltration area were gained by the simulation ofANSYS／FLOTRAN code. It is shown that the fiber volume fraction and initial temperature have astrong effect on the infiltration process. The simulation results of axisymmetric infiltration have agood agreement with their experimental ones. In addition, the infiltration time was predicted to get theeffective infiltration depth based on the simulation results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.953.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Study on Effect of Extrusion Velocity on Composites Liquid-Solid Extrusion Process Using 3D Thermo-Mechanical Simulation (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 210-215 
    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: On the basis of thermo-mechanical coupled FEM model which characterized thecomposites liquid-solid extrusion process, the constant-velocity and non-constant-velocity extrusionprocess were simulated by 3D thermo-mechanical FEM. Their influence on forming temperature,forming quality and deforming force was analyzed and compared. In the constant-velocity extrusionprocess, the results show the over-high and low forming temperature in earlier and terminal extrusionstage were responsible for the surface annular cracks and inner fibers breakage. In the newnon-constant-velocity extrusion process, however, the range of forming temperature can be shortenedin a reasonable range and the over-high and low forming temperature were thus eliminated. Thereforethe forming quality and its consistency can be improved. In addition, the deforming force can also bereduced. The simulation and the mechanisms analysis coincide with the experiment results reported inprevious literatures. The study provides the theoretical gist and a new feasible technical scheme tofavor the consistency of the extruded product quality in composites liquid-solid extrusion process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.210.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Investigation on the Numerical Simulation for the Dynamic Transition from Liquid to Solid during Liquid-Solid Extruding Forming (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 573-577 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The numerical simulation of liquid-solid extruding is completed with ABAQUS code inthis paper. The hydrostatic fluid element is used to simulate the deformation of liquid phase and thecontinuum element is used to the solidified layer. The combination of fluid element and continuumelement avoids the mesh distortion of liquid phase during extruding. The dynamic transition fromliquid to solid is implemented by sequential coupled thermal-mechanical analysis. One illustratedexample of liquid-solid extruding is presented in this paper at last to show the whole modelingprocess of the dynamic transition from liquid to solid in detail
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.573.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    A New Integration Method Proposed for Hyperbolic Sine Constitutive Equation Used in Semi-Solid Forming (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 578-582 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: This paper describes a new integration algorithm for hyperbolic sine constitutive equation(HSCE) used in semi-solid forming. An intermediate variable Lambda ranged from zero to one isintroduced to replace the inelastic strain rate in HSCE so that the inelastic strain rate can be solvedindirectly from the Lambda. The proposed integration algorithm is based on the stress update conceptand the effect of normal stress updating on the material compression is also discussed thoroughly inthis paper. The investigation results show that the new algorithm can integrate the HSCE efficientlyand the normal stress should keep constant as the deviatoric stress updating. An example ofsemi-solid extruding was given in the paper at last to illustrate the implementation of new algorithmand effect of normal stress updating on the compression of material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.578.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...