Print Email Facebook Twitter Numerical Modelling of Skin-Stringer Separation in Thermoplastic Composite Stiffened Panels Title Numerical Modelling of Skin-Stringer Separation in Thermoplastic Composite Stiffened Panels Author Malladi, Avyadhish (TU Delft Aerospace Engineering) Contributor Turteltaub, S.R. (mentor) Bisagni, C. (mentor) Alderliesten, R.C. (graduation committee) Giovanardi, Bianca (graduation committee) Degree granting institution Delft University of Technology Programme Aerospace Engineering | Structures and Materials Date 2024-02-22 Abstract This thesis project focuses on the evaluation of the Extended Finite Element Model (XFEM) for modelling skin-stringer separation in thermoplastic composite stiffened panels. The study uses test results from a reference study in the literature on a PEKK-FC carbon composite panel with three stringers joined to the skin using a short-fibre reinforced butt joint. The modelling strategy was developed using Double Cantilever Beam (DCB) specimens. The XFEM-based panel models were then developed using two different damage initiation criteria: Quadratic Stress Criterion (QUADS) and Maximum Principal Stress Criterion (MAXPS). These models were compared with the Virtual Crack Closure Technique (VCCT) model from the reference study. The project also addresses the challenges posed by the crack tip impingement problem in the XFEM-based model with MAXPS and tests different strategies to overcome it. A proof of concept is provided for using the UDMGINI subroutine to address these challenges, setting the stage for future studies and algorithm development. Subject XFEMVCCTDCBStiffened Panelbutt-jointThermoplastic CompositePEKK-FCUDMGINIskin-stringer separationPost-buckling analysisAbaqus To reference this document use: http://resolver.tudelft.nl/uuid:d217b773-e8c7-4f42-8d10-64bbc4ed9a63 Part of collection Student theses Document type master thesis Rights © 2024 Avyadhish Malladi Files PDF Thesis_Report_-_Avyadhish ... alladi.pdf 15.62 MB Close viewer /islandora/object/uuid:d217b773-e8c7-4f42-8d10-64bbc4ed9a63/datastream/OBJ/view