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Dilger K.,Institutsleiter | Hanssen E.,TU Braunschweig
Stahl und Eisen

There are different stress approaches available for the fatigue assessment of welded components. In addition to the nominal stress approach also local approaches such as the structural stress and notch stress approach are in use. These allow a more detailed strength analysis of welded joints and are already part of various recommendations and guidelines. But an industrial application requires comparative information about the transferability of results between the different approaches. The DVS therefore initiated a research project in cooperation with other member associations (CMT, FOSTA, FAT and FKM) of the AIF. Object of this research is to establish the transferability and comparability between the different approaches and to finally show the advantages of an application of local approaches. Source

Voss A.,Institutsleiter | Hundt M.,Fachgruppenleiter | Barth R.,Fachgruppenleiter | Sun N.,University of Stuttgart
VGB PowerTech

An issue of the German energy policy of the last months has been the assertion that a lifetime extension of nuclear power plants might be a stumbling block for the promotion of renewable energies, because nuclear power and renewable energies would be incompatible within the integrated electricity network. A technical-economic analysis of the electricity generating system with high shares of electricity generation from renewables shows that this assertion cannot be supported from a technical and operational perspective. In terms of lower electricity prices and climate protection a nuclear phase-out might even be counterproductive. Source

Hopmann C.,Institutsleiter | Michaeli W.,Ehem Institutsleiter | Bastian R.,Institute For Kunststoffverarbeitung
Gummi, Fasern, Kunststoffe

The gap impregnation process was developed at the IKV, Institute of Plastics Processing, for manufacturing high performance composite parts from fibre-reinforced plastics (FRPs) in only a few minutes. The process offers a high potential for the automated serial production of high-grade plane structural composite parts and the reduction of the process cycle times. The isothermal process control allows to achieve a high energy efficiency. Meanwhile this process technology also permits to manufacture successfully not only plane but also curved parts with transitions in thickness and components with integrated cut-outs in less than 5 min. The results obtained will now be transferred to more complex structures and the production of a carbon fibre engine hood in integral construction. Source

The design concept was developed for a new kind of fly ash-rich fine concretes characterized by a very good workability and high stability against segregation, while at the same time being free from the well-documented problems associated with the conventional sandrich and sand concretes. The new design concept leads, with the help of fewer mortar tests, to an easily workable concrete with high stability against segregation by using regional typical basic materials. The mortar tests are relatively easy and quick, and for practical considerations they are very efficient in mix-designs. There are fairly comparable characteristics in strength development, durability and deformation comparisons between ordinary hardened concretes and concretes with 8 mm and 2 mm maximum grain size. Thereby the fine concrete with low cement content has significantly favourable fresh concrete behaviours. A concrete witch was composed by the design concept was successful tested in a precast. Source

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