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Einfluss der Elektromobilität auf die Gussproduktion in der deutschen Gießereiindustrie (Teil 2)
(2019)
Einfluss der Elektromobilität auf die Gussproduktion in der deutschen Gießerei-Industrie – Teil 2
(2018)
Entwicklung von Gefüge- und Magneteigenschaften beim direkten Recycling von Fe-Nd-B-Basismagneten
(2021)
The Dimensional Accuracy of Thin-Walled Parts Manufactured by Laser-Powder Bed Fusion Process
(2020)
Jahrbuch Oberflächentechnik
(2020)
Folie zur Reibwerterhöhung
(2021)
Untersuchungen von Effizienzpotentialen der Getriebeschaltaktuatorik bei Off-Highway-Nutzfahrzeugen
(2021)
Intelligente Lastkollektivoptimierung für Erprobungen von elektrischen und hybriden Antriebssträngen
(2019)
Integrated laser based pre‐tempering at laser welding of AISI 1045 steel by using 3D‐scanner optics
(2021)
Die vorliegende Bachelorthesis widmet sich der Untersuchung und Entwicklung mög-licher modularer Sicherheitskupplungen für den Antriebstrang aktiver Exoskelette.
Basis der theoretischen Grundlagen bildet die Fachliteratur zu: Roloff/Matek Maschinenelemente. Die Struktur des Entwicklungsprozess dieser Arbeit, ist angelehnt an die Fachliteratur Konstruktionsmethodik und die VDI 2221.
Die Erkenntnisse der Literaturrecherche und Laborversuche bilden die Grundlage zur Beantwortung der zentralen Frage: Wie muss eine Sicherheitskupplung definiert und gestaltet werden um in ein aktives Exoskelett integrierbar zu sein?
Zusammengefasst ist das wichtigste Ergebnis, dass die Kombination aus Moment- und fremdbetätigten Kupplungen, ein vielversprechendes Lösungskonzept darstellt.
Virtuous cycles
(2019)
Made to measure
(2020)
An Investigation of the Deep Drawing Behavior of Automotive Aluminum Alloys at Very Low Temperatures
(2020)
Forming complex parts out of high and ultra-high strength aluminium alloys has proved to be more challenging in comparison to the currently used deep drawing steels. Nevertheless, aluminium alloys show a limited formability in contrast with, for example, deep drawing steels. Novel processes like Warm-forming, W-Temper or Hotforming, offer the potential to produce light and highly integrated one-piece components from such aluminium alloys at elevated temperatures. When considering aluminium alloys of the 7000 group, which can reach strength values (UTS) of about 600 MPa, crash components such as side impact bars would offer a suitable field of application.
Forming at elevated temperatures, in particular with the Hotforming process, offers high potential in the production of complex structural components on the one hand and in the use of existing press hardening equipment on the other. To date, the material behaviour of aluminium alloys in the 7000 group, applied in such processes and in the later final state after forming, is not sufficiently known.
Therefore, in this study, systematic investigations on the formability and the final strength during and after forming at elevated temperature of the EN AW-7075 aluminium wrought alloy from different suppliers are conducted. In general, material- and damage/ failure models were created and implemented into simulation in order to make predictions. Characterisation of the plastic material properties on the basis of various tensile specimens as shear-, notched-, tensile- and Erichsen tests are carried out to adapt the complex material- and failure models such as Barlat YLD2000 and GISSMO to the experimental values using a parameter optimisation. These were made for the material conditions during forming, i.e. after solution heat treatment, the final condition after artificial ageing at 180°C for 20 minutes, which corresponds to the cathodic dip coating, and the T6 condition, which is the highest strength condition.
To evaluate a suitable friction coefficient for high temperature forming processes, anti-friction agents are screened, and the potential applicability evaluated by strip-drawing tests. Thereby, using an analytical relationship, friction coefficients are determined at room temperature and 180°C, which are used as corresponding friction model for the finite element forming simulation.
Crash simulations using the nonlinear finite element method (FEM) of side impact protection beams are used to demonstrate the weight saving potential of high and ultra-high strength aluminium alloys compared to a beam made of press hardened steel. A weight saving of about 20 % could be achieved with the same crash performance. This can be significantly increased to around 30 % - 40 % by using local reinforcements such as CFRP or GFRP (carbon/ glass fibre reinforced plastic) patch. For this reason, a novel process was developed which is based on the conventional Hotforming process with an integrated thermal direct joining step called “Extended Hotforming”.
Subsequently, a heatable forming tool for the production of a serial like sheet metal side impact beam was developed to validate the finite element simulation and to demonstrate the potential of the forming processes at elevated temperatures for aluminium sheet metal components.
Direct digital manufacturing – the role of cost accounting for online hubs to access industry 4.0
(2021)
Direct Digital Manufacturing - The Role of Cost Accounting for Online Hubs to Access Industry 4.0
(2021)
Slurry development for lithography-based additive manufacturing of cemented carbide components
(2021)
Entwicklung von Pulvern und Prozessparametern für die additive Fertigung von WC-Co-Werkstoffe
(2018)
Total Internal Reflection Fluorescence Microscopy (TIRFM) – novel techniques and applications
(2020)