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  • 1
    Electronic Resource
    Electronic Resource
    Study into mechanical properties of TiN coating on Ti-6Al-4V alloy through three-point bending tests (2005)
    Bradford : Emerald
    Industrial lubrication & tribology 57 (2005), S. 193-196 
    Details
    ISSN: 0036-8792
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Purpose - To examine the mechanical properties of TiN PVD coated Ti-6Al-4V alloy through three-point bending tests. Design/methodology/approach - Ti-6Al-4V alloy is cut in size and polished and cleaned chemically before TiN PVD coating process. INSTRON three-point bending equipment is used to conduct the bending tests for TiN coated and uncoated workpieces. During the tests, the load and displacement characteristics were recorded. The tests were terminated when the coating failed. Micrographs of surface and crack sites were obtained by SEM. Findings - Coating failure occurs due to shearing effect on the tensile surface. The spalling and buckling of the coating on the compressive surface are observed. The compressive stress generated on the top surface (where the indent is in contact) did not cause adhesive failure of the coating. Moreover, cohesive cracks occur on the tensile surface of the coating. The crack ledge under the action of shear stress appears on the tensile surface of TiN coating and multi cracking of coating is resulted. The crack spacing is small indicating sliding and splitting separation between the adjacent columns in the coating. Research limitations/implications - The tests can be extended to include the duplex treated workpieces such as the heat treatment of surface prior to TiN coating. This enhances the interface properties of the coating and base alloy. Practical implications - The results can be used to assess the TiN coating applications in cutting tools, particularly drill bits and punches. Originality/value - This paper provides information on mechanical behavior of TiN coating when subjected to bending force and offers practical help for the researchers and scientists working in the coating area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/00368790510614163
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Some characteristics of YBa2Cu3Oy superconducting material obtained by arc-casting and laser melting (1997)
    Springer
    Journal of materials science 8 (1997), S. 171-177 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A superconducting Y-Ba-Cu-O with high Tc was prepared by arc casting to examine its effect on the crystalline phases in the annealed samples. X-ray diffraction (XRD) studies were carried out to investigate the orthorhombic superconducting phases. An a.c. susceptibility study was carried out and image analysis was conducted to obtain the density and grain size of the products. In addition, Nd:YAG laser melting of samples was carried out. It was found that the main crystalline phase was orthorhombic YBa2Cu3Oy and superconducting 1:2:3 crystalline phases were easily obtained by annealing in oxygen ambient and through laser melting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018546230133
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Trust region methods for structural optimization using exact second order sensitivity (1991)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 32 (1991), S. 275-293 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The performance of multiplier algorithms for structural optimization has been significantly improved by using trust regions. The trust regions are constructed using analytical second order sensitivity, and within this region, the augmented Lagrangian φ is minimized subject to bounds. Evaluation of first and second derivatives of φ by the adjoint method does not require derivations of individual (implicit) constraint functions, which makes the method economical. Eight test problems are considered and a vast improvement over previously used multiplier algorithms has been noted. Also, the algorithm is robust with respect to scaling, input parameters and starting designs.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620320204
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    Paper (German National Licenses)
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