Ferdinand Ferber

Hypermedia teaching of mechanics— MechANIma

In this paper we describe the mechANIma project, a joint venture between the department of computer science and the laboratory for mechanics at the University of Paderborn, Germany.

LTM-SOLA - a service-oriented application to integrate high-tech laboratories and virtual knowledge spaces

High-tech laboratories are an important kind of knowledge source, nevertheless most of todays laboratory architectures consist of tight coupled devices with proprietary interfaces. Although there are several approaches to implement cross-functional and heterogeneous infrastructures, these solutions do not consider high-tech laboratories. Therefore, we developed a service-oriented architecture for laboratories called LTM-SOLA, an application to control the devices by a modern web interface based on JavaEE and Seam technologies. Furthermore, we show how to use field bus couplers instead of programmable logic controllers (PLC) to enable single laboratory devices to be used in different test environments.

Damage analysis under thermal shock loading using eddy current sensors

Thermal shock is an extreme form of thermo-mechanical loading. Detailed investigations of thermal shock and lifetime analysis close to reality are necessary in industrial engineering, in order to get a good prediction of life expectancy for high quality and safety relevant machine components. This paper concentrates on experimental investigations of structural changes of the surface due to thermal shock loading, as structural changes in surface-like cracks are one of the main parameters which influence lifetime. For this purpose, cylindrical specimens of heat resistant steel (X15CrNiSi20-12) are heated up by a gas burner and are cooled down by water quench in a cyclical manner. After a continuous number of thermal shock cycles the girthed area of the specimen is measured by eddy current to find surface embrittlement, crack initiation and crack progress. Signal barriers for the impedance signal of the eddy current sensor are introduced in order to quantify the two dominating categories of surface damage, micro cracks and macro cracks. Furthermore, a so-called accumulated crack length is introduced as a damage parameter. This is related to the signal barriers and quantifies damage with respect to the number of thermal shock cycles. Furthermore, for visualisation of damage an innovative 3D plotting method is introduced, which projects eddy current data onto the digitalised surface.

Homogeneous Administration of Experiments in Material Science for Configuration, Monitoring and Analysis

In this paper, experimentall techniques and studys of deformation and failure arising in thermomecanically loaded speciments as a result of cyclic thermal shock will be given. The deformation is measured by the 3D-digitalisation method. Surface damage and crack initiation are localised by the eddy current method. Because of these problems it seems reasonable to analyze damage in materials by means of state-of-the-art continuum mechanics and experimentally methods [1, 2, 3, 4].

mechANIma - ganzheitliche Sicht auf neue Medien in der Mechaniklehre

Qualitatssteigerungen der Lehre eines Fachgebietes sind masgeblich von dem Grad der Nutzung neuer Medien gepragt. Das Laboratorium fur Technische Mechanik entwickelt in Kooperation mit der Arbeitsgruppe „Informatik und Gesellschaft“, Prof. Reinhard Keil-Slawik, Prof. Dr. Klaus Herrmann, ein Konzept fur computergestutzte multimediale Forschung und Lehre. Die Bezeichnung mechANIma stellt dabei die Synthese aus den Begriffen Mechanik und Animation dar. Die Begriffe „Multimedia“und seit neustem „Hypermedia“charakterisieren die Bestrebungen alle audio-visuellen Medien wie Vorlesungsunterlagen, Vortrage, Lehrfilme, Simulationen und Animationen in ein datenbankorientiertes Informations- und Dokumentenablagesystem zu integrieren. Dieses ist durch mechANIma auf der Basis von Hyperwave gelungen.