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  • 1
    facet.materialart.
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    Reinhold Grimm, "Love, Lust and Rebellion: New Approaches to Georg Büchner" (Book Review) (1988)
    Washington, etc. : Periodicals Archive Online (PAO)
    Germanic Review. 63:3 (1988:Summer) 150 
    Details
    ISSN: 0016-8890
    Topics: German, Dutch and Scandinavian Studies
    Notes: REVIEWS
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:1091-1988-063-03-000008
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Geometry Effects when Controlling Residual Stresses in Friction Stir Welds by Mechanical Tensioning (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 71-76 
    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: Finite element modelling has proved to be an effective tool for the investigation of trendseffected by changing welding conditions. This is especially important in mechanical tensioning offriction stir welds because of the large number of parameters involved. In this paper, an FE model isused to examine the effectiveness of the mechanical tensioning technique for controlling residualstresses in FSWs by the investigation of trends caused by changes to the welding parameters.Comparisons between different geometries, traverse speeds, and welding off-axis angle all producedconsistent results, and showed that the peak stresses are most strongly influenced by both the localtensioning and heat input, and not by the more global welding conditions. The results also showed aprogressive decrease in the residual stresses for increasing tensioning levels and, although affected by theheat input, a relatively low sensitivity to the welding variables. At tensioning levels greater than ~50% ofthe room temperature yield stress, tensile stresses were replaced by compressive residual stresses withinthe weld
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.71.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synchrotron Energy-Dispersive X-Ray Diffraction Analysis of Residual Strains around Friction Welds between Dissimilar Aluminium and Nickel Alloys (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 571-572 (Mar. 2008), p. 407-412 
    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: Friction welding processes, such as friction stir welding (FSW) and inertia frictionwelding (IFW) are popular candidate procedures for joining engineering materials (includingdissimilar pairs) for advanced applications. The advantages of friction welding include lack of largescale material melting, ability to join dissimilar materials, and relatively low propensity to introducedefects into the weld joint. For these reasons FSW and IFW have become the subjects of a numberof studies aimed at optimising the joining operations to obtain improved joint strength and reducedistortion and residual stress. In the present study we used the diffraction of high energypolychromatic synchrotron X-rays to measure interplanar lattice spacings and deduce nominalelastic strains in friction stir welds between dissimilar aluminium alloys AA5083 and AA6082, andin coupons from inertia friction welds between dissimilar nickel-base superalloys IN718 andRR1000. Energy-dispersive diffraction profiles were collected by two detectors mounted in thehorizontal and vertical diffraction planes, providing information about lattice strains in two nearlyperpendicular directions lying almost in the plane of the plate samples mounted perpendicularly tothe incident beam. Two-dimensional maps of residual stresses in friction-welded joints wereconstructed. Apart from the 2D mapping technique, the sin2ψ method (transmission) was also usedin the case of inertia friction-welded joint between nickel alloys. Comparison between the tworesults allowed the variation of the lattice parameter with the distance from the bond line to bededuced. It was found that friction welding of two dissimilar materials with significant strengthmismatch may lead to the creation of a region of compressive stress in the vicinity of the bond line,in contrast with the behaviour observed for joints between similar materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.407.pdf
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    FE Modelling of Mechanical Tensioning for Controlling Residual Stresses in Friction Stir Welds (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 4025-4030 
    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: Although Friction Stir Welding (FSW) avoids many of the problems encountered whenfusion welding high strength Al-alloys, it can still result in substantial residual stresses that have adetrimental impact on service life. An FE model has been developed to investigate the effectives ofthe mechanical tensioning technique for controlling residual stresses in FSWs. The model purelyconsidered the heat input and the mechanical effects of the tool were ignored. Variables, such astensioning level, heat input, and plate geometry, have been studied. Good general agreement wasfound between modelling results and residual stress measurements, justifying the assumption that thestress development is dominated by the thermal field. The results showed a progressive decrease inthe residual stresses for increasing tensioning levels and, although affected by the heat input, arelatively low sensitivity to the welding variables. At tensioning levels greater than ~ 50% of the roomtemperature yield stress, tensile were replaced by compressive residual stresses within the weld
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.4025.pdf
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    Paper (German National Licenses)
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