Tolerancing during the design of endless-fiber reinforced composite structures
Third party funded individual grant
Start date : 15.11.2017
End date : 14.11.2020
Extension date: 30.06.2021
Project details
Scientific Abstract
Each products deviates from its nominal shape, due to inevitable uncertainties and deviations like scattering material properties or varying loads. These variances may cause that even well-designed parts do not meet the requirements, which is particularly true for fiber reinforced composites because of the high number of design parameters and its specific mechanical properties. However, existing tolerance management approaches mainly focus on conventional isotropic materials and can only be used with restrictions for fiber reinforced composite structures. On the other side, specific design approaches for composites structures do not allow the consideration of variances and phenomenological observations focus on the manufacturing process only.
The goal of the research project is the development of an approach to consider variances through tolerancing during the design process of fiber reinforced composite structures. To achieve this goal, four different tasks have to be completed. The two most important tasks are the development of a procedure for the tolerance analysis based on the strain energy (I) and the extension by a procedure for the tolerance synthesis (II). Having completed these two tasks, it will be possible to find the relevant design parameters on the warpage of the part and to determine admissible scatter borders for the single design parameters to meet the requirements in any case. Based on these procedures, the design approach according to Klein and Wartzack can be extended by the tolerance analysis and synthesis (III). Furthermore, it is important to observe the influence of local reinforcements on the warpage of fiber composite parts and to find a way to consider local patches during the development of these methods (IV).
At the end of the project, an integral design approach from the first geometry to the final laminate stack-up considering tolerances will be available.
