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Dissertation
The Fatigue and Corrosion Fatigue Behavior of Austenitic Stainless Steel AISI 304 after Deep Rolling at Various Temperatures
(2019-09)
The austenitic stainless steel AISI 304 was deep rolled at 20 °C (RTDR), -195 °C (CTDR), and 550 °C (HTDR). The deep rolling pressures used for each deep rolling temperature were 1.0, 1.7, and 2.4 bar. From microstructural investigation, the largest compressive residual stress field was found in RTDR, and the highest amount of martensitic content and plastic deformation were found in CTDR. The strain aging effect was only found in HTDR.
In the rotating bending fatigue tests, the strain aging effect after HTDR is ...
Dissertation
Ergonomieassistenz
(2018-12-18)
Die Dissertation entwickelt und evaluiert Assistenzkonzepte in den Modalitäten visuell, auditiv und taktil zur Rückmeldung unergonomischen Verhaltens. Aufbauend auf den theoretischen Grundlagen der Assistenzsysteme, der Wahrnehmungsmodalitäten, der menschlichen Informationsverarbeitung und der adäquaten Assistenz erfolgte die Entwicklung der Assistenzkonzepte. Zur Anwendung kamen eine Augmented-Reality-Brille mit symbolischen Darstellungen in der visuellen Modalität, Kopfhörer mit Auditory Icons für den auditiven ...
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
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 ...
Konferenzveröffentlichung
The Influence of different die geometries on the Extrusion Process of High-Consistency Silicone Rubber
(Society of Plastics Engineers, 2019)
Silicone Rubber and especially High-Consistency Silicone Rubber (=HCR), are typically processed in the extrusion process. Due to the high requirements in terms of the ma-terial properties and the geometric dimensions, a funda-mental knowledge of the whole process including experi-ences in tool design are essential.
In this study, HCR with different Shore-hardnesses are extruded on a vertical silicone extrusion line with various breaker plates with different length to diameter ratios (=L/D-ratio) in order to analyze ...
Konferenzveröffentlichung
Pull and Foam - Injection moulding method: Foamed ribs for stiffening plane components
(Society of Plastics Engineers, 2012)
The pull and foam method is a foam injection moulding method which is currently being developed at the Institut für Werkstofftechnik (IfW) (Institute of Materials Engineering) at the University of Kassel. The processing principle represents an alternative to the existing foam injection moulding special procedures and introduces the possibility to partially foam a component. In so doing, thin-walled, hardly foamed components with foamed ribs can be made in one processing step, thus also components with graded ...
Konferenzveröffentlichung
Formation of morphology as a function of process control by foam injection molding of a functionally graded component
(Society of Plastics Engineers, 2014)
A special mold technology enables the production of foam injection molded components with locally differing foaming ratios. Thus, components with functionally graded foam structures can be produced in one processing step. The method (pull and foam method) is based on the idea of creating components with thin-walled areas with a high surface quality and partially foamed, thick-walled areas (e.g. with the function of integrated structural elements) in a controlled foaming process. This paper describes the characteristics ...
Konferenzveröffentlichung
Changeable Thermal Management for LED-Lighting
(Society of Plastics Engineers, 2015)
Thermal management of LED lights can be arranged by deliberately influencing lighting components conduction capabilities and reducing the thermal contact resistance for various joining processes. The research details the possibilities thereof and shows the thermal contact resistance of plastic and
Konferenzveröffentlichung
Development of a Radian Friction Welding Machine Using the Circular Process with Limited Rotational Motion
(Society of Plastics Engineers, 2013)
The processing-technological limitations of components which can not be continuously rotated, either due to their length or marginal protrusions, make the realization of several potential applications using rotation welding unthinkable. The difficulties that arise while generating a high quality weld and are caused by large component tolerances and component warping are known. In order to extend the potential of friction welding, it is necessary to develop a new welding technology. In cooperation with Fischer ...
Teil eines Buches
Prädiktive simulationsgestützte Optimierung von Kältemaschinen im Verbund
(kassel university press, 2017)
Prerequisite for an efficient cooling energy system is the knowledge and the optimal combination of different operating conditions of individual compression chillers. The performance of cooling systems depending on its part load performance and its condensing temperature are often unknown. Recorded energy data remains unused and manufacturers' data differs significantly from the real performance. For this purpose, manufacturer and real data are combined and continuously adapted to form partial load curve models. A ...