Theoretische und experimentelle Untersuchungen glasfaserverstärkter Verbundwerkstoffplatten unter dynamischer Belastung 2006-07-05
Aachen : Publikationsserver der RWTH Aachen University (2006, 2007)
Dissertation / PhD Thesis
A shock-wave tube has been used to investigate the behaviour of circular glass fibre reinforced plastic (GRP) plates under impulsive loading. The kind of loading the structures are subjected to in the tube corresponds to similar loading situations in reality, e.g. an aeroplane's wings undergoing air loading, chimneys experiencing gust loading or explosive loading on technical strcutures. It is important to bear in mind the structural response to these loadings in the design stages. The aim of this study is to find a reliable way to simulate and thus predict the response of a class of these structures to shock-wave loading. The theoretical approach combines two aspects: geometrical nonlinearities and rate-dependent material behaviour. The first order shear deformation shell theory used, developed to cater for small strains and moderate rotations, accounts for the possible geometrical nonlinearities and shear deformations. Elastic and viscoelastic material laws have been implemented into the finite element programme. In order to confirm the calculated material parameters and determine the material behaviour of the glass fibre reinforced specimens under different strain rates, a selection of quasi-static and dynamic experiments are done. The reliability of the deformations calculated by the finite element programme is investigated by comparison with the results from the experiments using the shock wave tube. The influence of the chosen boundary conditions on the simulation results as well as the sensitivity of the simulation results with respect to variations in material parameters has been investigated.