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Beobachtung und Analyse
(1994)
Das schöne Fremde: Angloamerikanische Einflüsse auf die Sprache der deutschen Zeitschriftenwerbung
(1996)
Semi-solid metal alloys, as used in thixoforming, have a special microstructure of globular grains suspended in a liquid metal matrix. The complex rheological properties are strongly influenced by the local solid fraction, particle shape, particle size and state of agglomeration. There is a high demand for models and software tools allowing the simulation of semi-solid casting processes. The material under investigation is a tin-lead alloy (Sn-15%Pb) which exhibits a similar microstructure to aluminium alloys. The experiments were performed with a concentric cylinder rheometer of the Searle type. Initially, the liquid alloy is cooled down to the semi-solid range under constant shearing and then kept under isothermal conditions for further experimentation. Based on the experimental data, a single-phase model has been derived where the semi-solid alloy is regarded as a homogeneous material with thixotropic properties and the microstructure is characterised by a structural parameter. The model consists of two parts: the equation of state, including a finite yield stress, and a rate equation for the structural parameter. The model equations are employed in numerical software and used for the simulation of characteristic filling cases and the comparison with the conventional filling.
Betriebswirtschaftslehre
(2000)
Unternehmensführung
(2000)
Adoptionsfaktoren : empirische Analyse am Beispiel eines innovativen Telekommunikationsdienstes
(2000)
Investigation of the use of ceramic materials in innovative light water reactor – fuel rod concepts
(2001)
Sexueller Missbrauch im Spiegel der Medien : eine Medienanalyse über einen Zeitraum von 25 Jahren
(2001)
Adoption und Diffusion
(2001)
Semi-solid metal alloys, as used in thixoforming, have a special microstructure of globular grains suspended in a liquid metal matrix. The material under investigation is a tin–lead alloy (Sn–15% Pb) which exhibits a similar microstructure as aluminum alloys. The experiments were performed with concentric cylinder rheometers. Initially, the liquid alloy is cooled down to the semi-solid range under constant shearing and then kept under isothermal conditions for further experimentation. The microstructure is characterized in dependence of the shearing time. The rheological techniques consisted of step change of shear rate and shear stress ramp experiments for different solid fractions (40–50%). Based on the experimental data a single phase model has been derived, where the semi-solid alloy is regarded as a homogeneous material with thixotropic properties and the microstructure is characterized by a structural parameter. The model consists of two parts: the equation of state, including a finite yield stress, and a rate equation for the structural parameter. The model equations are employed into numerical software and used for the simulation of a characteristic thixocasting process. The results are compared to real experiments.
Begriffsfassung und Rahmenbedingungen betrieblicher Bildungsarbeit - Die Bedeutung von Schlüsselqualifikationen für die betriebliche Weiterbildung in KMU - Gegenwärtiger Professionalisierungsgrad- Instrumente systematischer Weiterbildung in KMU - Formen und Methoden der Durchführung von Bildungsmaßnahmen in KMU