Subproject C1: Mechanical characterisation of textile-reinforced composites under thermomechanical short and long-time loads
Supervision
Prof. Dr.-Ing. habil. Maik Gude
TU Dresden
Institute of Lightweight Engineering and Polymer Technology
01062 Dresden
Germany
Phone: +49 351 463-38153
Fax: +49 351 463-38143
Abstract
Multi-axial textile reinforced composites with thermoplastic matrix offer huge application potentials for a rapid manufacture of components close to the final contours with a load-adapted property profile. The development of corresponding material models as well as an extensive experimental material characterisation forms the foundation for the design of such complex lightweight structures. The application of these new textile reinforced materials in lightweight structures requires not only the knowledge of the quasi-static material behaviour but also a material characterisation under complex operating loads and environmental effects. Especially, these technically relevant operational conditions include cyclic loads and thermally induced stresses. For these load cases, there is a lack of the essential experimental investigations which consider the distinct anisotropy as well as the corresponding material models. The developed mesomechanical material models for quasi-static loading conditions and the characteristic material functions provided in the SFB material-database during the basic phase form the origin for the extension to complex loads.
The determination of the essential directional material properties, property functions and arbitrary parameters for composites made from woven and weft-knitted hybrid-yarn textiles under quasi-static loads already took place in the "basis phase". In the "interconnection phase", this fundamental material characterisation will be extended with adequately modified textile composites in order to develop gradually improved textile composites in collaboration with project-area A and subproject D4. For the improvement of the developed material degradation models, the influence of process-related parameters from the textile processing and the composite manufacture needs to be identified. In the mechanical framework, these effects need to be considered by means of suitable probabilistic approaches.
Additionally, the influence of superimposed thermal loadings on the material behaviour will be investigated experimentally. Associated functional dependencies will be identified in the "interconnection phase". In order to determine temperature-related degradation parameters, extensive uni-axial and multi-axial tests with superimposed temperature influence will be carried out using flat specimen and tube specimen. Beyond these tests, experimental and theoretical investigations regarding the fracture-mode-related fatigue behaviour under tension/compression-torsion loads are planned for the novel textile composites.