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  • 1
    Digitale Medien
    Digitale Medien
    Elastic/crystalline-viscoplastic finite element analysis of dynamic deformation of sheet metal (1996)
    Bradford : Emerald
    Engineering computations 13 (1996), S. 308-326 
    Details
    ISSN: 0264-4401
    Quelle: Emerald Fulltext Archive Database 1994-2005
    Thema: Technik allgemein
    Notizen: Describes the development of a dynamic-explicit type finite-element formulation based on elastic/crystalline-viscoplastic theory to predict the dynamic forming limits of sheet metal. Formulates an evolution equation governing all the slip stages of a single crystal, by modifying Pierce and Bassani's crystalline plasticity models. Interprets precisely the experimentally observed hardening evolution. Takes account of the importance of the strain rate and temperature sensitivity of the material in predicting dynamic plastic instability. Analyses the deformation and strain localization in a rectangular sheet under stretching, in relation to the plane strain assumption, using the numerical results to demonstrate the influences of tension force and temperature on strain localization, and to show the temperature dependence of shear band formation. Demonstrates that the deviation of tension direction from the axis of symmetry of a single crystal causes non-simultaneous sliding between primary and conjugate slip systems, resulting in S-shaped non-symmetrical deformation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1108/02644409610114585
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  • 2
    Digitale Medien
    Digitale Medien
    Static-explicit elastic plastic finite element simulation and virtual manufacturing of sheet metal forming (1996)
    Bradford : Emerald
    Engineering computations 13 (1996), S. 283-307 
    Details
    ISSN: 0264-4401
    Quelle: Emerald Fulltext Archive Database 1994-2005
    Thema: Technik allgemein
    Notizen: Describes the development of a static-explicit type finite-element formulation based on non-linear elastic plastic shells, non-linear contact friction and Barlat anisotropic plasticity with modified corner theory. Newly introduces the spin of the anisotropic axes as a means of deriving the objective stress rate. Demonstrates that a C0 continuous shell is an efficient finite element for large-scale computation. Uses membrane shell theory to derive a kinematic description of the external contact force. Offers an explanation of the ways in which the material, press load and lubrication affect the deformation and strain localization in the automotive sheet metal forming process. Demonstrates a trial of virtual manufacturing incorporating finite-element simulation, a visualized inspection system and a heuristic process optimization scheme.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1108/02644409610114576
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  • 3
    Digitale Medien
    Digitale Medien
    Dynamic-explicit elastic plastic finite-element simulation of hemispherical punch-drawing of sheet metal (1996)
    Bradford : Emerald
    Engineering computations 13 (1996), S. 327-338 
    Details
    ISSN: 0264-4401
    Quelle: Emerald Fulltext Archive Database 1994-2005
    Thema: Technik allgemein
    Notizen: Describes the development of a dynamic-explicit finite-element simulation code based on anisotropic elastic-plastic theory and non-linear contact friction theory. Points out that whereas in industrial production the dynamic-explicit finite-element code has proved to be an efficient and robust tool for sheet metal forming, in the automobile industry sheet metal forming is usually a quasi-static process; therefore seeks to make clear the dynamics of deformation and strain and to evaluate mass scaling, damping scaling and material viscosity scaling parameters. Introduces the penalty method and the kinematic description method as means to derive a rate-type contact force formulation employing the four-node degenerated shell finite element. Also introduces the jewely patch scheme to describe the tool geometry. Analyses the hemispherical punch deep-drawing of a square plate and compares this with the experimental results. Confirms the applicability of the newly developed finite-element code to the quasi-static forming process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1108/02644409610114594
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  • 4
    Digitale Medien
    Digitale Medien
    Evaluation of Plastic Behaviors in FCC Polycrystal Sheet Metal (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 145-148 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The stress-strain characteristics and plastic behavior of aluminum alloy were examinedby tensile test and infrared thermo-viewer. This thermo viewer is a device for converting a thermalradiation pattern from an object into visible images. Al-Mg alloy plates with different crystal grainsize subjected to a uni-axial tensile load were measured continuously by this thermo viewer. Thestrain concentration pattern was analyzed by the differential thermal image and the macroscopicestimation method by the thermal image processing was proposed and the propriety of FEsimulation based on polycrystalline plasticity model was shown
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.145.pdf
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    A finite element simulation of the sheet metal forming process (1988)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 25 (1988), S. 283-292 
    Details
    ISSN: 0029-5981
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: A finite element simulation code of the sheet metal forming process has been developed. This simulation code plays an important role in the computer aided engineering (CAE) system for an automobile parts forming process, which includes the pre- and post-processes. The paper presents the development of an updated Lagrangian type finite element modelling, based on the elastic-plastic (J2 flow law) membrane shell theory. An attempt is made to calculate the strain distribution incurred by peripherally clamped or non-clamped square plates when impressed by rigid punches. These are the cases of square box-shape punch drawing and arbitrary shaped panel stretch forming.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/nme.1620250121
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