Validierung von Finite-Elemente-Simulationen mithilfe von Dehnmessfasern am Beispiel einer GFK-Querblattfeder

Abstract

This thesis deals with the validation of finite element simulations using optical measuring fiber, strain gauges and force transducers. The focus is especially on the evaluation of the measuring fiber and the validation procedure. The validation with the associated data management and visualization is shown using the example of a transverse leaf spring made of glass fiber reinforced plastic. The aim of this work is therefore to develop a validation procedure that is suitable for modern measuring systems such as the optical measuring fiber and enables an objective and visually clear validation of FE simulations. For this work, it is possible to build on a validation test and a finite element shell model that have already been carried out. However, the model still needs to be adapted in some aspects to the validation tests. For this purpose, coupon tests on the composite are being evaluated for the generation of material cards using optimisation. For the validation, a data management system based on the Python programming language and the HDF5 storage format was developed, which can automatically create a corresponding validation file with the necessary input parameters for the validation. This validation file can be visualized and validated using the graphical user interface and associated metrics developed for this purpose. The core of the work represents a virtual measurement fiber, which is developed for a better comparison of the strain values from the strain measurement fiber with the simulated strain values. This virtual strain measurement fiber can be integrated into the simulation via appropriate elements and contacts. The strain measurement fiber is examined in more detail and a plausibility check is performed. The virtual strain measurement fiber thus enables a simple comparison between reality and simulation.