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Konferenzveröffentlichung
Flexible Foams made of Liquid Silicone Rubber and expandable Microspheres
(2019-10-02)
In this study, the possibility of foaming liquid silicone rubber (LSR) was investigated. The foam was produced by injection molding with two different thermoplastic, expandable microspheres. Different properties were tested using the S2-tensile bar, e.g. density, tensile strength, specific tensile strength, elongation at break, stress at 100 % strain and the hardness. It was found that the two types of microspheres used have similar effects on density, specific tensile strength and elongation at break, but differ in ...
Konferenzveröffentlichung
Hybrid composite materials made of polypropylene with wood and polyethylene terephthalate fibers
(Society of Plastics Engineers, 2014)
We aim to manufacture injection molded components which consist of thermoplastics reinforced with fibers and which have improved properties (high strength and high notched impact strength). Thus, we intend to access new application fields for the not readily visible area of the automobile interior.
Konferenzveröffentlichung
Characterizing the Rheological Behavior of Liquid Silicone Rubber Using a High Pressure Capillary Rheometer
(Society of Plastics Engineers, 2016)
The injection molding process of liquid silicone rubber (LSR) imposes high demands on the injection molding machines and the tools due to the low viscosity of silicone rubber. There is very little data which describes the rheological behavior of LSR and its influencing factors across a range of shear rates.
In this study, the rheological behaviors of different types of LSR were characterized using a high pressure capillary rheometer with an apparent shear rate that ranged from 350 to 4000 1/s. In order to identify ...
Dissertation
Proaktive Tätigkeitsunterstützung
(2018-12)
In der vorliegenden Dissertation wird eine Methode zur Identifikation von durchgeführten Tätigkeiten anhand der Pupillendynamik entwickelt. Dieses Methode bildet die Grundlage für eine kontextabhängige Unterstützung bei der Durchführung von Tätigkeiten durch ein Nutzerassistenzsystem. Hierzu werden aus der Literatur Merkmale zusammengetragen, die sich aus der Pupillendynamik ableiten lassen und sich zur Kontexterkennung eignen. Aufbauend auf diesen grundlegenden Merkmalen, werden differenziertere Merkmale entwickelt, ...
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 ...
Aufsatz
Constitutive modeling of nonlinear reversible and irreversible ferromagnetic behaviors and application to multiferroic composites
(2016-03-10)
The coupling of magnetic and mechanical fields due to the constitutive behavior of a material is commonly denoted as magnetostrictive effect. The latter is only observed with large coupling coefficients in ferromagnetic materials, where coupling is caused by the rotation of the domains as a result of magnetic (Joule effect) or mechanical (Villari effect) loads.
However, only a few elements (e.g. Fe, Ni, Co, and Mn) and their compositions exhibit such a behavior. In this article, the constitutive modeling of nonlinear ...
Aufsatz
Mixed-mode crack tip loading and crack deflection in 1D quasicrystals
(2016)
Quasicrystals (QC) are a new class of materials besides crystals and amorphous solids and have aroused much attention of researchers since they were discovered. This paper presents a generalized fracture theory including the J-integral and crack closure integrals, relations between J1, J2 and the stress intensity factors as well as the implementation of the near-tip stress and displacement solutions of 1D QC. Different crack deflection criteria, i.e. the J-integral and maximum circumferential stress criteria, are ...
Aufsatz
Integration of Heat Pump Storage Systems in Manufacturing Systems via Data Farming and Monte Carlo Simulation
(2019)
The electrification of industrial energy demand is essential for effective climate protection and a successful energy transition. In production systems with fluctuating heating and cooling demands, heat pumps can make a significant contribution to electrification and increased efficiency in a demand-oriented production with automated standby operation. In order to dimension a suitable heat pump storage system, well-founded statistical information about the production system is required. For the creation of stochastic ...
Buch
Schlussbericht zum Projekt SimCast – Simulationsgestützte Prognose der Dauer von Logistikprozessen
(2018)
Für den kundenindividuellen Anlagenbau in der Unikat- und Kleinserienfertigung sind die termingerechte Fertigstellung, Lieferung und Inbetriebnahme einer Anlage entscheidende Wettbewerbsfaktoren. Bei der Planung neuer Projekte kann das bisher aus Projekten erworbene Wissen allerdings nicht 1:1 in ein neues Projekt übertragen werden, da die Parameter und die Dauer der Montage- und Logistikprozesse von dem jeweils zu montierenden Bauteil abhängig sind. Aus diesem Grund wird diese Prozessdauer heute nur grob abgeschätzt; ...
Dissertation
Simulation-based optimization of solar thermal systems
(2018)
In this PhD thesis application of numerical methods to simulation-based optimization of solar thermal systems both in the planning process and in operation is investigated. The optimization process starting from definition of a target function and specification of optimization parameters, moving forward with application of an optimization algorithm and ending up by sensitivity analysis at the found optimum, is described in detail. A hybrid genetic CHC – binary search algorithm is proposed and applied. As a combination ...