Browsing by Author "Thibaud, Charles"

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    Centrifugal casting of glass plates: a finite-element analysis of process parameter influence
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1995) Lochegnies, Dominique; Thibaud, Charles; Oudin, Jérôme
    For the first time, glass centrifugal casting is analyzed by finite-element viscoplastic models. First of all, the sensitivity of the process parameters is analyzed on the radius lengthening of a glass gob during casting using central processing unit time-saving models. The suitability of glass for centrifuging is evaluated, taking its temperature, viscosity, mould rotation speed and time dependency, casting time and initial gob shape into account. A refined finite-element analysis of an NBS-710 plate production is then achieved. The results are used in decision-aid process design curves which allow the manufacturer to efficiently adjust process parameters with regard to the desired final shape.
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    Computation procedure for the temperature in hot glass application to the finite element Simulation of hollow glass forming
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1996) Lochegnies, Dominique; Noiret, Christophe; Thibaud, Charles; Oudin, Jérôme
    A new incremental procedure is developed for the thermal analysis in 3D glass products considering the one-dimensional analytical solutions for a semi-infmite glass wall. When coupled to a code being capable of computing large mechanical deformations, this allows to analyze efficiently the glass flow during the pressing, self-deformation and blowing processes. The forming of a reference tumbler is analyzed via finite element simulations. For each forming step, the temperature distribution is calculated from the pressing parameters; pertinent results are found for this first application.