Production and transforming behavior of austenitic polymer core and yielding groups

Production and forming behaviour of austenitic steel sandwich composites with a polymer core layer Three-layered symmetrical sandwich combines offer a great lightweight construction potential due to their structural construction and her good recession behavior at simultaneously high strength. By the combinability of the qualities of the combined partners sandwich combines as good solution offer their services if it is about high strength at good resistance in the lightweight construction. Depending on a functional request all sorts of materials, metals, polymer and others, are used as deck and nuclear material. This one is a central problem for the construction, the processing and later use of sandwich systems in comparison with the monolithic materials, terrible forming behaviour of the combined partners with strongly different Youngth Modulus as well as the question of the adhesion of the different material layers. Nowadays the industrial use of such sandwich materials is still limited. In the context of the project Untersuchungen zur Kompatibilisierungsmethode Umformen fur unterschiedliche Metall - Nichtmetall - Systeme promoted by the DFG three layered Sandwich materials were manufactured and analyzed for their characteristics concerning the adhesive strength of the sandwich partners and the forming behaviour. The task existed in the development, the production and investigation of new sandwich materials, which can be adapted to special requirements regarding their functional characteristics. Only the combined view of the material and constructional components leads to system-oriented materials, construction units, concepts and structures. On the basis of an industrially manufacturing process an adapted press-joining process for sandwich materials was developed. At the beginning of the project polymer foils were used as core materials, then in th developed pres-joining process different polymers granules were used as core material. Thereby fiber-reinforced PA and PP granules were used. As skin layers high-grade steel sheets of the quality 1,4404 and aluminum plates AlMg3 were used. Depending upon manufacturing processes for the polymer foil an epoxy resin adhesive was used and for the polymer granules three different adhesion agents were used. A reproducible manufacturing could be proven by the angle peeling test. The stretching and deep-drawing characteristics of the sandwich materials as a function of the core layers could be pointed out in the Erich