Andreas Friedel (1), Sebastian Heimbs (2), Peter Horst (2), Carsten Schmidt (3), Marc Timmermann (3)
Composites Part C: Open Access. Volume 10 (March 2023). DOI: https://doi.org/10.1016/j.jcomc.2023.100350

Keywords

Effects of defects, automated fibre placement, carbon fibre-reinforced polymer, multiscale simulation

Abstract

In this paper, a 3D finite element modelling approach is presented to assess the effects of manufacturing defects within composite structures. The mesoscale modelling approach derives the stress-strain response of a composite structure from a representative structural element. A set of tensile and bending loads is used to compute its ABD-Matrix. The boundary conditions of the model are described in detail as is the extraction of the strain and curvature response. The derived stiffness from the presented modelling approach is compared to the classical lamination theory and the models' shortcomings are discussed. Finally, the influence of a gap, an overlap and two different-sized fuzzballs on the macroscopic mechanical properties of a composite structure are evaluated using the presented multiscale modelling approach, thereby providing stiffness matrices influenced by the defects for the use in global models of composite parts.

How Our Software Was Used

Required segmentations were done manually using Dragonfly and then volume thickness maps were created.

Author Affiliation

(1) Institute of Aircraft Design and Lightweight Structures, Technische Universität Braunschweig, Ottenbecker Damm 12, Stade, Germany
(2) Institute of Aircraft Design and Lightweight Structures, Technische Universität Braunschweig, Hermann-Blenk-Straße 35, Braunschweig, Germany
(3) Institute of Production Engineering and Machine Tools, Leibniz Universität Hannover, Ottenbecker Damm 12, Stade, Germany