Papers by Author: A. Lohrengel

Abstract: Due to increased product requirements, usual conditions for materials cannot be applied anymore. To reduce energy consumption, lightweight constructions are demanded but they cannot stand necessary mechanical stress. Therefore, local reinforced elements are applied for instance. According to actual research in material sciences, it is prerequisite to verify the position of this strengthening. Various physical principles can be used for non-destructive testing of this effect. In this article, an approach based on acoustic signals is presented. On the one hand a strategy could be to do comparative studies between nominal and sample and on the other to predetermine the place just by acoustic parameters like eigenmodes. In preliminary test, vibration characteristics of these innovative materials (e.g. bake-hardening plate and sandwich structure) are determined and reveal capabilities for acoustic methodologies. So, this approach could be a promising tool to localize reinforced elements.

Abstract: New interdisciplinary material and manufacturing technologies make local configuration of material properties possible. The availability of material property information in the early construction process and adequate welding technologies are essential needs to realize a maximum utilization of material. The research objective of two cooperating institutes at the Technical University of Clausthal is to develop a design strategy with related design rules in order to engineer high strength coupling elements of requirement optimized composite materials. Special attention is paid to the usage of future welding technologies and their influence on material properties of locally altered materials. Further objective is an early survey of the consequences caused by the usage of locally altered materials in mixed architecture design projects to the whole production process.