Suche
Anzeige der Dokumente 31-40 von 45
Aufsatz
Optimization of thermomechanical processes for the functional gradation of polymers by means of advanced empirical modeling techniques
(2015-02-17)
In this paper, an optimization procedure for complex manufacturing processes is presented. The procedure is based on advanced empirical modeling techniques and will be presented in two parts. The first part comprises the selection and generation of the empirical surrogate models. The process organization and the design of experiments are taken into account. In order to analyze and optimize the processes based on the empirical models, advanced methods and tools are presented in the second part. These tools include ...
Aufsatz
Morphology-property-relationship of thermo-mechanically graded self-reinforced polypropylene composites
(2015-02-17)
In this paper the relationship between different composite morphologies and their mechanical properties is to be investigated. By manufacturing two different tape-based polypropylene composites in a compression moulding process, four varying degrees of compaction will be generated. The morphological structure is analyzed using confocal laser light microscopy and wet chemically etched specimen cross-sections. The etching process removes the amorphous phase in the polymer, making the macromolecular orientations and ...
Aufsatz
A framework for the computer-aided planning and optimisation of manufacturing processes for components with functional graded properties
(2015-02-17)
In this contribution a framework for the computer-aided planning and optimisation of functional graded components is presented. The framework is divided into three modules - the "Component Description", the "Expert System" for the synthetisation of several process chains and the "Modelling and Process Chain Optimisation". The Component Description module enhances a standard computer-aided design (CAD) model by a voxel-based representation of the graded properties. The Expert System synthesises process steps stored ...
Aufsatz
Comparative investigation of two-dimensional imaging methods and X-ray tomography in the characterization of microstructure
(2017-10-02)
The microstructural features of three different materials have been quantified by means of 2D image analysis and X-ray micro-computer tomography (CT) and the results were compared to determine the reliability of the 2D analysis in the material characterization. The 3D quantification of shrinkage pores and Fe-rich inclusions of an Al-Si-Cu alloy by X-ray tomography was compared with the statistical analysis of the 2D metallographic pictures and a significant difference in the results was found due to the complex ...
Aufsatz
Innovative Materials for Novel Concepts for Internal Heat Exchangers
(2018-07-27)
Internal heat exchangers are often employed in solar thermal applications as well as in many other applications that involve heat, and, for the most part, consist of metallic materials (copper, stainless steel). Corrugated stainless steel tubes are easy to assemble, and are commonly used in various storage geometries. In order to significantly reduce costs, alternative materials, such as plastics, can function as excellent substitutes. Alternative heat exchangers for the following examinations using various materials ...
Aufsatz
The Manufacture of Hot-Compacted Layered Composite Systems Made of Oriented Semifinished PP-Films
(2014-03-04)
Monoaxial stretched PP-films are used for the manufacture of hot-compacted layered composites. These are layered with stretched co-extruded coupling agent films, and are consolidated to laminates by means of a hot-compaction process, which employs pressure and temperature. This paper aims to examine the influence of the process settings on the properties of the composites during the hot-compaction process. For this purpose, the mechanical values will be determined by means of tensile testing variously compacted and ...
Buch
Thermo-mechanische Gradierung eigenverstärkter Polypropylen-Composite
(kassel university press, 2015)
Eigenverstärkte Polypropylen-Composite weisen ein enormes Leichtbaupotential und überdurchschnittliche mechanische Grundeigenschaften auf. Das Eigenschaftsspektrum lässt sich auf die makromolekulare Orientierung oder sog. Eigenverstärkung der eingesetzten textilen Faser- und Bändchenhalbzeuge zurückführen, welche die Ausgangsbasis der Schichtverbunde bilden. Über eine gezielte Prozessführung kann die Eigenverstärkung bis ins heißkompaktierte Bauteil hinein kontrolliert und erhalten werden, wobei sich das Eigenschaftsspektrum ...
Buch
Rotatives Vibrationsschweißen
(kassel university press, 2017)
Schweißversuche mit den von dem Schweißmaschinenhersteller Fischer Kunststoff-Schweißtechnik GmbH entwickelten Prototypenmaschinen für das neuartige Rotative Vibrationsschweißen zeigen eine vergleichbare erforderliche Prozessführung und die bereits bekannten Ausprägungen der vier Schweißprozessphasen anderer Vibrationsschweißverfahren. Unter Verwendung unterschiedlicher Werkstoffe und Probekörpergeometrien zeigt sich, dass sich die Fügenahteigenschaften von mit dem Rotativen Vibrationsschweißverfahren gefügten ...
Buch
Beitrag zur Herstellung 3-dimensionaler Kunststoffscheiben mit integrierter Funktion zur Veränderung der Transparenz durch Elektrochromie
(kassel university press, 2017)
Ziel dieser Arbeit ist es Möglichkeiten der Kunststoffverarbeitung aufzuzeigen, um feste 3D Bauteile mit elektrochromen (EC) Eigenschaften herzustellen. Die momentanen EC Anwendungen reduzieren sich fast ausschließlich auf plane Fensterscheiben aus Glas für die Gebäudeverglasung. Vereinzelt gibt oder gab es aber auch Anwendungen im Flugzeug- und Automobilbau. Die Anforderungen bezüglich des Schaltverhaltens sind in den erwähnten Bereichen sehr hoch und führen zu einer kostenintensiven Produktion.
Am Anfang der Arbeit ...