Print Email Facebook Twitter Post-buckling analysis of composite stiffened panels Title Post-buckling analysis of composite stiffened panels: A systematic analysis on the influence of imperfections Author Almaz, Kübra (TU Delft Aerospace Engineering) Contributor Castro, Saullo G.P. (mentor) Kassapoglou, C. (graduation committee) Yue, N. (graduation committee) Degree granting institution Delft University of Technology Programme Aerospace Engineering Date 2024-01-19 Abstract Pushing the envelope of aerospace structures requires the complete exploitation of their potential in terms of load-carrying capacity per unit weight for both economic and ecological reasons: the two most important being the reduction of fuel consumption and greenhouse gas emissions. A key approach involves allowing structures like stiffened panels to function within the post-buckling range domain while in service. To do so, the finite element approach allows a broad design space for researching the post-buckling behaviour of such structures.Accurately representing post-buckling behaviour in finite element models requires accounting for geometric and loading imperfections. The present study explores their effects on the post-buckling behaviour of a composite L-stiffened panel. A finite element model is created and validated based on an experimental case. This is then further modified to incorporate imperfections. Geometric imperfections are modelled using linear eigenvalue modes, while loading imperfections are introduced via a rigid loading plate making contact at an angle. The research showed that both first and higher eigenmode combinations for geometric imperfections influence post-buckling behaviour. Their shape and amplitude impact the transition into post-buckling and their ultimate loads. Similar behaviour was also observed for loading imperfections. Additionally, their configuration also showed an offset in axial displacement results. These insights emphasise the need for precise imperfection modelling to promote safer and more efficient post-buckling design of aerospace structures. Subject Post-buckling analysisCompositesStiffened panelAbaqusFEM analysisGeometrical ImperfectionsLoading Imperfections To reference this document use: http://resolver.tudelft.nl/uuid:0689ab78-65ae-41f6-90a1-65c2097ae522 Part of collection Student theses Document type master thesis Rights © 2024 Kübra Almaz Files PDF MSc_Thesis_K_bra_Almaz_V4_pref.pdf 24.29 MB Close viewer /islandora/object/uuid:0689ab78-65ae-41f6-90a1-65c2097ae522/datastream/OBJ/view