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  • Electronic Resource  (3)
  • 2005-2009  (3)
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  • Electronic Resource  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Application of Acoustic Emission in Control of High-Pressure Pipe Overstraining (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 13-14 (Feb. 2006), p. 153-158 
    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: The article describes the application of AE technique in control and evaluation of the pipeoverstraining process. The trials of overstraining were conducted according to a programme of pipeloading with internal pressure, developed and adjusted to the examined pipe material.In the studies two systems of acoustic emission were used, viz. PAC Mistras 2001 and VallenAMSY. The procedure adopted in the development of evaluation criteria based on an analysis of therecorded acoustic events was described. Next, the criteria of evaluation were presented. Theeffectiveness of the applied method, the validity of the adopted criteria, and the consistency of theobtained quantitative results were checked during tests performed by other NDT methods.A comparative analysis was made to serve as a complementary tool in final evaluation of the pipeoverstraining process done by AE technique
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.13-14.153.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence of the Ground Triplet State of Silicon-Carbon Divacancies (P6, P7 Centers) in 6H SiC: An EPR Study (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 527-529 (Oct. 2006), p. 535-538 
    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: P6 and P7 centers, which are responsible for semi-insulating properties of SiC,were shown to be neutral Si-C divacancies (VSi-VC)o having a triplet ground state. The EPRexperiments that were performed at very low temperatures and in complete darkness excludethe possibility of a thermal or optically excited triplet state and, as a result, the existing modelof excited triplet state P6 and P7 centers was discarded. The optical alignment process whichinduces the spin polarization of the ground triplet 3A state of the P6, P7 centers in SiC wasinterpreted to be caused by strong spin selectivity of the intersystem crossing (ISC) nonradiativetransitions from an excited 3E state to a metastable singlet 1A state. Theluminescence and optical absorption are caused by transitions between spin sublevels of 3Aand 3E states. The analogy in properties of a divacancy in SiC and the N-V defect in diamondallows considering the divacancy in SiC as a potential defect for the single defectspectroscopy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.527-529.535.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Estimate of Tool Wear in Milling Operation Based on “Differential” Wear Rate Model (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 786-790 
    Details
    ISSN: 1662-7482
    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: Many research show that in metal cutting process wear rate is dependent on the cuttingprocess variables such as temperature at tool face, contact pressure (normal stress) and relativesliding velocity at tool/chip and tool/work interface; their relationship is described by “differential”wear rate model. Based on this “differential” wear rate model, a method to estimate tool wear inmilling operation is proposed and the cutting process variables are predicted by performing chipformation analysis with FEM code ABAQUS/Explicit and heat transfer analysis withABAQUS/Standard. The implementation is exemplified by estimating tool wear of carbide tools inmilling of Ck45 work. Both progressive flank wear and crater wear profile are estimated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/38/transtech_doi~10.4028%252Fwww.scientific.net%252FAMM.10-12.786.pdf
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    Paper (German National Licenses)
    Fulltext
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