@inproceedings{9716, author = {{Strauß, Sara}}, booktitle = {{Age Matters}}, location = {{Dresden}}, title = {{{Visualising Memory Loss and the Politics of Representation in Contemporary Portraiture}}}, year = {{2018}}, } @misc{9728, author = {{Flotmann-Scholz, Christina}}, booktitle = {{Cercles: Revue Pluridisciplinaire du Monde Anglophone}}, title = {{{Identity Politics in George Lucas’ Star Wars. by John C. McDowell}}}, year = {{2018}}, } @inbook{9812, author = {{Herzig, Bardo and Schelhowe, H. and Robben, B. and Klar, Tilman-Mathies and Aßmann, S.}}, booktitle = {{Jahrbuch Medienpädagogik 14. Der digitale Raum – Medienpädagogische Untersuchungen und Perspektiven}}, editor = {{Pietraß, M. and Fromme, J. and Grell, P. and Hug, T.}}, pages = {{135--156}}, publisher = {{VS Springer Verlag}}, title = {{{Design von Interaktionsräumen für reflexive Erfahrung – Wie werden im Digitalen Medium implementierte Modelle erfahr- und verstehbar? }}}, year = {{2018}}, } @article{9813, author = {{Robben, B. and Herzig, B. and Klar, Tilman-Mathies and Schelhowe, H.}}, journal = {{i-Com Journal of Interactive Media }}, number = {{17(3)}}, pages = {{211--218}}, publisher = {{De Gruyter}}, title = {{{Begreifbare Learning Environments - A framework of Interaction Design for Reflective Experience}}}, year = {{2018}}, } @inbook{9814, author = {{Klar, Tilman-Mathies and Herzig, Bardo and Robben, B. and Schelhowe, H.}}, booktitle = {{Spannungen und Potentiale. Digitaler Wandel in Bildungseinrichtungen}}, editor = {{Knaus, T. and Engel, O.}}, pages = {{133--150}}, publisher = {{kopaed}}, title = {{{Mehr als Coding – Entwicklung, Anwendung und Reflexion von Modellen im Kontext digitaler Medien}}}, year = {{2018}}, } @article{9829, author = {{Bohmann, M. and Tiedau, J. and Bartley, Tim and Sperling, J. and Silberhorn, C. and Vogel, W.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, title = {{{Incomplete Detection of Nonclassical Phase-Space Distributions}}}, doi = {{10.1103/physrevlett.120.063607}}, year = {{2018}}, } @article{9899, abstract = {{Bainite is a steel microstructure consisting of three phases, bainitic ferrite, austenite and carbides. It forms in two different morphologies, upper and lower bainite, where different diffusion mechanisms are dominant. The aim of this work is to simulate both transformations within a unified model. To this end, we extend an own previously published model for lower bainite with diffusion across the phase interface. As a central idea we introduce weighted Helmholtz energy functions and a weighted mobility tensor, respectively. The individual Helmholtz energy functions and mobility terms are related to the different diffusion mechanisms which are responsible for the formation of both morphologies. Two representative examples illustrate the capability of the coupled phase field/diffusion model and show the expected behaviour.}}, author = {{Düsing, M. and Mahnken, R.}}, issn = {{0020-7683}}, journal = {{International Journal of Solids and Structures}}, keywords = {{Coupled phase field/diffusion model, Bainite, Multiphase field method, Cahn–Hilliard diffusion, Diffusion across the interface, Lower bainitic transformation, Upper bainitic transformation, Thermodynamic framework, Microforce balance}}, pages = {{172--183}}, publisher = {{Elsevier}}, title = {{{„A coupled phase field/diffusion model for upper and lower bainitic transformation”}}}, volume = {{135}}, year = {{2018}}, } @phdthesis{9931, author = {{Düsing, M.}}, title = {{{„Simulation of bainitic transformation with the phase field method“. }}}, year = {{2018}}, } @article{9933, author = {{Mahnken, Rolf and Lenz, Peter and Dammann, Christian}}, issn = {{0939-1533}}, journal = {{Archive of Applied Mechanics}}, pages = {{2081--2099}}, title = {{{"A least squares approach for effective shear properties in an n-layered sphere model"}}}, doi = {{10.1007/s00419-018-1431-5}}, year = {{2018}}, } @article{9934, author = {{Dammann, Christian and Caylak, Ismail and Mahnken, Rolf}}, issn = {{0936-7195}}, journal = {{GAMM-Mitteilungen}}, title = {{{"Sequential biaxial stretching of polycarbonate-films for characterization of strain-induced anisotropy"}}}, doi = {{10.1002/gamm.201800003}}, year = {{2018}}, } @article{9935, author = {{Penner, Eduard and Caylak, Ismail and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{67--68}}, title = {{{A multivariate stochastic material model with correlated material parameters}}}, doi = {{10.1002/pamm.201710020}}, year = {{2018}}, } @article{9936, author = {{Ju, Xiaozhe and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{601--602}}, title = {{{"Error-controlled homogenization for a class of linear elastic composite problems"}}}, doi = {{10.1002/pamm.201710270}}, year = {{2018}}, } @article{9937, author = {{Düsing, Martin and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{505--506}}, title = {{{"A coupled phase transformation and solute diffusion model for bainitic transformation"}}}, doi = {{10.1002/pamm.201710222}}, year = {{2018}}, } @article{9940, author = {{Dridger, Alex and Caylak, Ismail and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{55--56}}, title = {{{"A fuzzy finite element method for sparse experimental data based on a possibilistic approach"}}}, doi = {{10.1002/pamm.201710016}}, year = {{2018}}, } @inproceedings{9987, abstract = {{Rubber-metal-elements are used in a wide range of applications for vibration and sound isola- tion. Nowadays it is state of the art to calculate the lifetimes of these elements under mechanical stress prior to their service life. To establish more reliable and safer rubber-metal-elements, continuous monitoring by dif- ferent sensors can be used. Especially prognostics enable a rise in reliability, availability and safety. To estab- lish these advantages, estimating the remaining useful lifetime of rubber-metal-elements should be realized during its service life based on current information on its condition. Therefore a suitable measure to monitor the condition of the element is necessary. This work focuses on temperature signals. This approach allows in- cluding the ambient temperature and thereby involving changing operating conditions. For estimating the RUL of rubber-metal-elements a model-based prognostics approach based on particle filtering is proposed. Its performance is analyzed regarding relevant parameters to enable the best performance for the applied data.}}, author = {{Bender, Amelie and Sextro, Walter}}, booktitle = {{Safety and Reliability – Safe Societies in a Changing World}}, pages = {{1025--1033}}, title = {{{A particle filtering approach for temperature based prognostics}}}, year = {{2018}}, } @article{9990, abstract = {{The handling of fine powders is an important task in modern production processes. However, as fine powders strongly tend to adhesion and agglomeration, their processing with conventional methods is difficult or impossible. Especially when processing small amounts of highly sensitive fine powders, conventional methods reach their technical limits. In process steps such as dosing, transport, and especially mixing of fine powders new methods are required. Apart from the well-known method of manipulating powder properties by adding chemical additives, this contribution aims at improving the handling of dry fine powders by using vibrations at different frequencies. Modules are presented, which enable the continuous dosing, the homogeneous mixing and the transport of dry fine powders. Finally, these modules are combined for the production of a homogeneous mixture of two dry fine powders.}}, author = {{Dunst, Paul and Bornmann, Peter and Hemsel, Tobias and Littmann, Walter. and Sextro, Walter}}, journal = {{ACTUATOR 2018; 16th International Conference on New Actuators}}, pages = {{142--145}}, title = {{{Vibration Assisted Dosing, Mixing and Transport of Dry Fine Powders}}}, year = {{2018}}, } @article{9991, abstract = {{Abstract:Since fine powders tend strongly to adhesion and agglomeration, their processing withconventional methods is difficult or impossible. Typically, in order to enable the handling of finepowders, chemicals are added to increase the flowability and reduce adhesion. This contributionshows that instead of additives also vibrations can be used to increase the flowability, to reduceadhesion and cohesion, and thus to enable or improve processes such as precision dosing, mixing,and transport of very fine powders. The methods for manipulating powder properties are describedin detail and prototypes for experimental studies are presented. It is shown that the handling of finepowders can be improved by using low-frequency, high-frequency or a combination of low- andhigh-frequency vibration.}}, author = {{Dunst, Paul and Bornmann, Peter and Hemsel, Tobias and Sextro, Walter}}, journal = {{Actuators 2018, 7(2).}}, keywords = {{powder handling, flowability, dosing, transport, mixing, dispersion, piezoelectricactuators, vibrations}}, pages = {{1--11}}, title = {{{Vibration-Assisted Handling of Dry Fine Powders}}}, doi = {{10.3390/act7020018}}, year = {{2018}}, } @inproceedings{9992, abstract = {{State-of-the-art industrial compact high power electronic packages require copper-copper interconnections with larger cross sections made by ultrasonic bonding. In comparison to aluminium-copper, copper-copper interconnections require increased normal forces and ultrasonic power, which might lead to substrate damage due to increased mechanical stresses. One option to raise friction energy without increasing vibration amplitude between wire and substrate or bonding force is the use of two-dimensional vibration. The first part of this contribution reports on the development of a novel bonding system that executes two-dimensional vibrations of a tool-tip to bond a nail- like pin onto a copper substrate. Since intermetallic bonds only form properly when surfaces are clean, oxide free and activated, the geometries of tool-tip and pin were optimised using finite element analysis. To maximize the area of the bonded annulus the distribution of normal pressure was optimized by varying the convexity of the bottom side of the pin. Second, a statistical model obtained from an experimental parameter study shows the influence of different bonding parameters on the bond result. To find bonding parameters with the minimum number of tests, the experiments have been planned using a D-optimal experimental design approach.}}, author = {{Dymel, Collin and Eichwald, Paul and Schemmel, Reinhard and Hemsel, Tobias and Brökelmann, Michael and Hunstig, Matthias and Sextro, Walter}}, booktitle = {{(Proceedings of 7th Electronics System-Integration Technology Conference, Dresden, Germany)}}, keywords = {{ultrasonic wire-bonding, bond-tool design, parameter identification, statistical engineering}}, pages = {{1--6}}, title = {{{Numerical and statistical investigation of weld formation in a novel two-dimensional copper-copper bonding process}}}, year = {{2018}}, } @inproceedings{9993, abstract = {{Ultrasonic bonding and welding are common friction based approaches in the assembly of power electronics. Interconnections with cross-sections of 0.3 mm² up to 12 mm² made from copper are well suited in high power applications. For increasing friction energy, which is responsible for bond formation, a two-dimensional vibration approach is applied to newly developed interconnection pins. Using two-dimensional vibration for bonding requires identification of suitable bonding parameters. Even though simulation models of wire bonding processes exist, parameters for the two-dimensional pin-bonding process cannot be derived accurately yet. Within this contribution, a methodology and workflow for experimental studies identifying a suitable bond parameter space are presented. The results of a pre-study are used to set up an extensive statistical parameter study, which gives insights about the bond strength change due to bond process parameter variation. By evaluation of electrical data captured during bonding, errors biasing the resulting shear forces are identified. All data obtained during the experimental study is used to build a statistical regression model suitable for predicting shear forces. The accuracy of the regression model’s predictions is determined and the applicability to predict process parameters or validate simulation models is assessed. Finally, the influence of the tool trajectory on the bond formation is determined, comparing one dimensional, elliptic and circular trajectories.}}, author = {{Dymel, Collin and Schemmel, Reinhard and Hemsel, Tobias and Sextro, Walter and Brökelmann, Michael and Hunstig, Matthias}}, booktitle = {{(Proceedings of 8th Electronics IEEE CPMT Symposium Japan (ICSJ 2018), Kyoto, Japan)}}, keywords = {{ultrasonic two-dimensional bonding, electrical interconnection, process parameters}}, pages = {{41--44}}, title = {{{Experimental investigations on the impact of bond process parameters in two-dimensional ultrasonic copper bonding}}}, year = {{2018}}, } @book{9995, abstract = {{Selbstoptimierung bietet die Möglichkeit der autonomen Anpassung des Systemverhaltens an veränderliche Ziele. Dabei ist vor allem der Aspekt Zuverlässigkeit von maßgeblicher Bedeutung, da über einen an die aktuelle Systemzuverlässigkeit angepassten Betriebspunkt die Leistungsfähigkeit verbessert wird, während das Ausfallverhalten besser vorhersehbar wird. Zur Anpassung des Systemverhaltens an die aktuelle Zuverlässigkeit mittels Selbstoptimierung müssen die ersten beiden Schritte des Selbstoptimierungsprozesses unterstützt werden. Für die Analyse der Ist-Situation ist eine Erkennung des aktuellen Degradationszustands mittels Condition Monitoring notwendig. Zur Auswahl geeigneter Verfahren werden bestehende Ansätze hinsichtlich ihrer Eignung klassifiziert. Der zweite Schritt, die Bestimmung der Systemziele, wird durch eine strukturierte Methode zum Finden verlässlichkeitsrelevanter Zielfunktionen ergänzt. Dabei werden kritische Komponenten identifiziert, Optimierungsparameter festgelegt und die Verlässlichkeit in Abhängigkeit des Systemverhaltens quantifiziert. Entwickler selbstoptimierender Systeme werden somit durch geeignete Mittel bei der Implementierung beider Schritte unterstützt. Abschließend wird der praktische Einsatz der vorgestellten Methoden anhand zweier Beispiele gezeigt.}}, author = {{Meyer, Tobias and Kaul, Thorben and Kimotho, James Kuria and Sextro, Walter}}, pages = {{193--213}}, publisher = {{Springer Nature Switzerland AG. Part of Springer Nature.}}, title = {{{Steigerung der Intelligenz mechatronischer Systeme}}}, volume = {{Steigerung der Verlässlichkeit technischer Systeme}}, year = {{2018}}, }