The European project DAEDALOS includes the numerical and experimental investigation of the effects of transient load conditions - such as a landing impact or a flight through gusts - on various aircraft structures. In order to take those effects into account when pre-designing aircraft it is necessary to study the damping behavior of structures on the material and the component level as well as to establish appropriate decay curves of stress levels and deformations. This approach could be used to improve and partially replace present design criteria based on static loads by more realistic solutions. The assignment of the Institute of Structural Mechanics and Lightweight Design (SLA) is to measure the material damping of specimens made up of aluminium and carbon-fiber-reinforced plastic and to provide data for finite element analyses (FE). Furthermore, experimental modal analyses are carried out on thin-walled stiffened plates and on sandwich panels to investigate the relationship between modal properties and stability behavior of these components. This work is complemented by FE-analyses.