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  • 1
    Electronic Resource
    Electronic Resource
    Finite Element Simulation of Forming, Joining and Strength of Sheet Components (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 344 (July 2007), p. 21-28 
    Details
    ISSN: 1013-9826
    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: A 3-D solid finite element simulation of sheet forming processes is briefly discussed.Examples of cold or warm deep-drawing and sheet hydro forming are presented. Sheet work-piecescan be assembled to produce complex components by using different techniques: such as welding ormechanical fastening. They must also be simulated in order to evaluate and optimise the quality ofthe parts; examples of hemming and of self piercing riveting are described. Structural computationallows us to evaluate the strength of a component and especially the strength of the joining. In thefuture, more precise optimization of the components will be possible by the transfer of data fromthe previous stages of sheet forming and joining, to the structural computation code. This input datawill be firstly the distribution of residual stresses, the evolution of local properties such as elasticlimit, damage and anisotropy. An example of structural computation on a system of two sheetsassembled by a single rivet is presented
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.344.21.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Inverse problems in finite element simulation of metal forming processes (1996)
    Bradford : Emerald
    Engineering computations 13 (1996), S. 190-225 
    Details
    ISSN: 0264-4401
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology
    Notes: Focuses on the inverse problems arising from the simulation of forming processes. Considers two sets of problems: parameter identification and shape optimization. Both are solved using an optimization method for the minimization of a suitable objective function. The convergence and convergence rate of the method depend on the accuracy of the derivatives of this function. The sensitivity analysis is based on a discrete approach, e.g. the differentiation of the discrete problem equations. Describes the method for non-linear, non-steady-state-forming problems involving contact evolution. First, it is applied to the parameter identification and to the torsion test. It shows good convergence properties and proves to be very efficient for the identification of the material behaviour. Then, it is applied to the tool shape optimization in forging for a two-step process. A few iterations of the inverse method make it possible to suggest a suitable shape for the preforming tools.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02644409610114530
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  • 3
    Electronic Resource
    Electronic Resource
    A two-dimensional finite element idealization for thermo-elastic deflection in beams (1983)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 19 (1983), S. 1453-1465 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper addresses the problem of thermo-elastic deflection in beams using a two-dimensional finite elemement idealization of the cross-section. Bending effects are introduced in a gerneralized plane strain formulation assuming that constant curvature dominates the flexural deformation. The method leads to a plane strain calculation which is very interesting from the computational point of view; thermal deendence of the physical properties can be taken into account, which would be inconceivable in a three-dimensional problem.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620191004
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  • 4
    Electronic Resource
    Electronic Resource
    Finite element formulation for non-steady-state large deformations with sliding or evolving contact boundary conditions (1989)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 28 (1989), S. 753-768 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A method using a material description of the instantaneous configuration, valid for viscoplastic material with large deformations, is presented. In view of numerical tests which were carried out, this material formulation, associated with an implicit integration scheme which proved to be numerically accurate and reliable, is shown to be preferable.An algorithm is developed for resolution of sliding or evolving contact condition problems.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620280403
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  • 5
    Electronic Resource
    Electronic Resource
    Finite element formulations for non-steady-state large viscoplastic deformation (1985)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 21 (1985), S. 1697-1708 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Different mechanical formulations are employed for calculation of the large deformations occurring in metal forming processes. Eulerian and updated Lagrangian descriptions, valid for viscoplastic materials, are presented. In view of the numerical tests which were carried out, the Eulerian formulation, associated with an implicit integration scheme which proved to be numerically accurate and reliable, is shown to be preferable.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620210911
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