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Diplom- und Master-Arbeiten (eigene und betreute):

E. Rama Lista:
"Finite Element Simulations of Laminated Composites under Consideration of Nonlinear Ply Material and Delamination";
Betreuer/in(nen): H. E. Pettermann; Institut für Leichtbau und Struktur-Biomechanik, TU Wien; Universidade de Vigo, 2012.



Kurzfassung englisch:
Fiber-reinforced polymer composites are becoming increasingly interesting for the industry and the investigators over the last years because of their high specific strength and stiffness values, being aerospace structures their main field of application nowadays.

The goal of this master thesis is to investigate two of the main damage mechanisms in laminated composites, which are intra-laminar damage and delamination, and the interaction between them. For that purpose, nonlinear finite element simulations are performed on a structure in which these two damage mechanisms are likely to happen. The structure is modelled by means of FEM with the finite element package ABAQUS. Besides, an automated preprocessor for the generation of the mesh and boundary conditions of the model is written in Python programming language.

The plies of the laminate are discretized as shell elements and coupled with cohesive contact. For both damage mechanisms, damage models available in ABAQUS are utilized. In addition, an ILSB-developed damage model for ply failure, which accounts for plasticity and brittle damage, including softening, is also used.

The results show an interaction between both damage mechanisms, where delamination induced matrix ply failure is observed. Delamination front changes from one interface to another at this point. Even though the stiffness of the structure is overpredicted, the results show good agreement with experimental tests available from previous investigation of the ILSB.

Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.