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http://elib.uni-stuttgart.de/handle/11682/14
2024-03-27T02:58:25ZTesting and evaluation of anchor channels under fatigue loading
http://elib.uni-stuttgart.de/handle/11682/14147
Titel: Testing and evaluation of anchor channels under fatigue loading
Autor(en): Fröhlich, Thilo; Lotze, Dieter
Zusammenfassung: Cast-in anchor channels are used to connect steel components to concrete structures e.g., for elevators, cranes or machines, where repeated load cycles require verification against fatigue failure. The fatigue resistance of anchor channels may be determined by tests according to the interactive method, which provides a complete description of the S/N curve from one to infinite load cycles according to the current assessment document. This procedure differs from conventional fatigue concepts, which do not consider loads that are part of low cycle fatigue, but also question the general existence of an endurance limit. An alternative approach presented in this paper is based on the assumption that the S/N curve can be approximated by a bilinear function. The procedure for the evaluation of fatigue tests on anchor channels embedded in concrete is described. A comparison with the current qualification criteria is given by a test example to discuss the applicability of the proposed method.2020-01-01T00:00:00ZRudolf Mehmke (1857-1944) - Leben. Werk. Familie. Briefwechsel
http://elib.uni-stuttgart.de/handle/11682/14108
Titel: Rudolf Mehmke (1857-1944) - Leben. Werk. Familie. Briefwechsel
Autor(en): Maurer, Bertram
Zusammenfassung: Rudolf Mehmke (1857-1944) war um 1900 in Deutschland einer der führenden Mathematiker für angewandte Mathematik. Er stand im Briefkontakt mit zahlreichen Mathematikern in ganz Europa. Dieses Buch enthält etwa tausend Briefe aus seinen Briefwechseln mit Mathematikkollegen, Ingenieuren und Schülern. Es sind Briefe mit 188 Briefpartnern. Dazu gehörten prominente Mathematiker wie zum Beispiel Felix Klein, Hermann Minkowski, Arnold Sommerfeld und Carl Runge. Aufgenommen wurde auch eine Reihe von privaten Briefen aus der Familie Mehmke. Sie illustrieren den umfangreichen biographischen Teil des Buchs, in dem das Leben und die wissenschaftliche Leistung Mehmkes dargestellt werden.
Das Buch stellt auch sein familiäres Umfeld vor. Von 1906 bis zum Tod im Jahr 1944 wohnte er in Stuttgart in der Löwenstraße im Degerlocher Villenviertel. Das Haus ist im Wesentlichen noch heute erhalten.
In den Lebensbeschreibungen der Familienangehörigen und den Kurzbiographien über seine Briefpartner wird viel Zeitgeschichte sichtbar. Sein Bruder Bruno war als erster hauptamtlicher Sekretär des CVJM erfolgreich und gründete den „Jugendfreund“, das heute noch vielen bekannte Kinderblatt der Evangelischen Kirche in Württemberg. Mehmkes Tochter fiel 1940 in Grafeneck den NS-Krankenmorden zum Opfer. Sein Sohn musste sich drei Mal beruflich neu orientieren. Etliche seiner Briefpartner wurden in der NS-Zeit verfolgt, manche dienten sich dem neuen System an.2024-01-01T00:00:00ZUncertainty visualization : concepts, methods, and applications in biological data visualization
http://elib.uni-stuttgart.de/handle/11682/14090
Titel: Uncertainty visualization : concepts, methods, and applications in biological data visualization
Autor(en): Weiskopf, Daniel
Zusammenfassung: This paper provides an overview of uncertainty visualization in general, along with specific examples of applications in bioinformatics. Starting from a processing and interaction pipeline of visualization, components are discussed that are relevant for handling and visualizing uncertainty introduced with the original data and at later stages in the pipeline, which shows the importance of making the stages of the pipeline aware of uncertainty and allowing them to propagate uncertainty. We detail concepts and methods for visual mappings of uncertainty, distinguishing between explicit and implict representations of distributions, different ways to show summary statistics, and combined or hybrid visualizations. The basic concepts are illustrated for several examples of graph visualization under uncertainty. Finally, this review paper discusses implications for the visualization of biological data and future research directions.2022-01-01T00:00:00ZExperimental investigation on the fatigue design of anchor channels
http://elib.uni-stuttgart.de/handle/11682/14011
Titel: Experimental investigation on the fatigue design of anchor channels
Autor(en): Fröhlich, Thilo; Lotze, Dieter
Zusammenfassung: Cast‐in anchor channels subjected to repeated cyclic actions need to be verified against fatigue failure. However, the fatigue behavior of these fasteners has rarely been investigated up to now. Consequently, the fatigue verification is not covered by the provisions of EN 1992‐4 and specific design rules apply for this product. This article gives a brief overview of the current design methods for anchor channels under fatigue loading and addresses its limitations. Results of experimental investigations within a recent research project are presented that focused on the fatigue resistance of fastenings under combined static and fatigue loading. Accompanying strain measurements provide insights about the distribution of cyclic tension loads through the channel profile to the anchors. In addition, tests under pulsating and alternating shear perpendicular to the channel axis were performed to outline the suitability under fatigue relevant shear loads. The test results obtained are discussed with respect to the existing state of knowledge. Finally, recommendations for the fatigue design of anchor channels are given.2022-01-01T00:00:00Z