P 942 - Development of intelligent materials to reduce wear in forging dies

P 941 - Dynamic design of steel and steel composite railway bridges with small and medium spans for high-speed traffic The further development of the European railway network is characterised, among other things, by the increased use of high-speed trains and a significant increase in operating speeds. Along with this development, more and more railway lines will be needed in future that are built and upgraded for high-speed traffic or need to be converted. Steel and composite steel bridge structures represent economical and technologically advanced solutions. In addition to the WIB bridges (rolled concrete girders) that have been used in the Deutsche Bahn rail network for more than 100 years, the aim is also to use more modern composite cross-section types with a high degree of prefabrication. Composite prefabricated girders (VFT) are of particular interest to DB. Furthermore, the trough bridges in steel construction with thick deck plates (d ≥ 100 mm) developed in recent years are proving to be advantageous due to their low construction height and favourable noise emission properties, among other things. When designing railway bridges for high-speed traffic, the engineer responsible must provide dynamic verification to show that the bridge structure fulfils the requirements for load-bearing capacity and serviceability even when realistic dynamic tensile loads are applied. For speeds of v > 200 km/h, however, this verification is currently only possible with a great deal of work and computational effort and only with the use of special software, the use of which requires a high level of expertise in the field of bridge modelling. The aim of the research project is to provide a method for the simplified dynamic design of steel and steel composite railway bridges at high speeds and to develop a guideline for realistic numerical modelling. In addition to trough bridges in steel construction, both classic WIB cross-sections and modern VFT girders are the subject of the investigations. As part of the project, measurements were carried out on existing railway bridges in order to assess the dynamic behaviour of the various cross-sectional shapes and bridge systems. The results form the basis for further numerical simulation calculations for detailed structural analyses. The research objectives will result in a significant increase in competitiveness not only for engineering offices, but also for the technical departments of steel processing companies and construction firms involved in bridge building. In addition, the research project can make a significant contribution to the increased use of steel and steel composite structures in railway bridge construction. The research project was carried out at the Institute of Steel Construction at RWTH Aachen University and the Institute of Structural Mechanics at Bauhaus University Weimar with expert support and financial assistance from the Forschungsvereinigung Stahlanwendung e. V., Düsseldorf, with funds from the Stiftung Stahlanwendungsforschung, Essen. Publication: 2016 Authors: M. Feldmann, B. Hoffmeister, H. Bigelow, C. Könke, V. Zabel, S. Höll, I. Reichert

P 944 - Flexible production of locally reinforced support structure variants using bonded blank One lightweight construction strategy is the production of load-optimised components using bonded blanks technology, which involves doubling sheets in areas subject to high loads. The bonded blanks technique involves deep-drawing a base sheet together with a reinforcing sheet to produce a double-layer sheet composite. After the joint deep-drawing process, the deep-drawn sheets are structurally joined using adhesive. As part of the research project, various aspects of the bonded blanks technique are being investigated to expand the range of possible applications. A new tool concept for the flexible deep drawing of bonded blanks components was developed and implemented. The mould design was carried out with the aid of FE simulation. The tool system has adjustable pockets for the reinforcing sheet to enable the flexible production of reinforced and unreinforced bonded blank components with the same forming tool. In addition, the integration of a joining process into the deep drawing process was realised in the forming tool. Further research foci were the investigation and identification of suitable adhesives and the determination of the bond strength of the bonded blanks components. The adhesives were rheologically analysed with regard to their temperature-dependent viscosity. The bonded blanks produced were artificially aged by means of a corrosion test in order to assess the effects of the corrosion condition on the bonded joint and thus on the bond strength. Determining the bond strength of the bonded blanks as a function of the corrosion condition was a key focus of the component tests. These investigations were supplemented by non-destructive testing using Lockin thermography to evaluate the bonded joint. Publication: 2016 Authors: Prof. Dr.-Ing. Prof. h. c. K. Dilger, Dipl.-Ing. G. Wisner