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Pouchias, Konstantinos (author)Lugs are a specific type of joint with a semi-circular geometry around the pinhole utilized in the aerospace field. Its distinct geometry and ability to carry loads in its plane make it a very common choice for design engineers. Although this type of joint is widely used, there are no analytical equations that can predict the stresses around the...master thesis 2023
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Romaris Villanueva, Javier (author)An analytical model for the onset and growth of delaminations induced by matrix cracks under static loading is proposed. The model introduces four distinct configurations of delaminations originating from crack tips, which are applicable to cross-ply and general symmetrical laminates subjected to tension or tension + shear.<br/><br/>The...master thesis 2023
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van Herwerden, Thijs (author)Fiber reinforced composites have been increasingly used in the aerospace and automotive industry, due to their potential advantages for designing flexible, strong and lightweight structures. More recently they are also being considered for the manufacturing of marine propellers. Since they have the potential to lower the weight, lower the...master thesis 2023
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Elnily, Yasser (author)The use of Grid-stiffened structures has been increasing in the space industry over the last decade. Thanks to it is high specific mechanical properties and excellent damage tolerance characteristics, researchers also started looking into the potential of using them for aeronautical applications. However, not much has been done to investigate...master thesis 2023
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Adams, Maarten (author)Fiber Reinforced Composite (FRC) materials are gaining great popularity in marine structures because of their excellent strength-to-weight ratio, low density, and provided freedom in the design process. However, the use of FRC materials comes along with relatively large uncertainties in material properties and structural integrity after...master thesis 2022
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Gkekas, Athanasios (author)This study is an attempt to develop a preliminary composite fuselage sizing tool for the decision making process utilizing analytical structural analysis equations and a bottom-up cost approach to estimate weight and cost. Previous research by several authors and companies is reviewed in order to define the knowledge gaps that the project is...master thesis 2021
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Nuñez Larios, RAFAEL (author)The Paris agreement’s mechanisms for 2050 represent a challenge for the world to achieve Net-zero emission and climate resilience. Retrofitting the existing stock is a critical step in every nation to achieve these goals. The building sector has a significant role in the Net-zero emission transition. The ambitions for retrofitting the...master thesis 2021
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Roepman, Thore (author)Straight fiber variable stiffness laminates use multiple overlapping patches to tailor the fiber orientations in particular regions of the laminate. A novel, automated framework for the design of manufacturable laminate has been developed using different stages. In the first and second stage an optimal stiffness distribution is determined using...master thesis 2021
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van Dijk, Milan (author)Induction welding is an effective technique for joining unidirectional carbon fiber reinforced thermoplastic composites and L-joints can be produced through quick and cost-effective processing steps. However, due to high localized stresses in the skin-stiffener interface, these L-joints are often avoided in primary aircraft structures. Also, no...master thesis 2019
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Huijer, Arno (author)Fibre-reinforced composites are increasingly being used in maritime structures. Piezoelectric sensors can be used to monitor both loads acting on a fibre-reinforced composite structure and elastic waves emitted from damage initiation within the structure. In certain marine applications, due to a harsh environment or for hydrodynamic reasons,...master thesis 2019
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Massart, Philippe (author)In this thesis, a methodology is presented to predict impact damage on next-generation (composite) aircraft based on maintenance data of in-service (metal) aircraft. To achieve this conversion, an analytical model is developed to Model Impact Damage on Aircraft Structures (MIDAS) for composite (-C ) and metal (-M ) aircraft. The model...master thesis 2018
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Cederløf, Daan (author)A numerical fatigue delamination model is validated by means of experimental tests. Delamination is initiated on the skin-stiffener interface which, under cyclic compressive loading and in the post-buckling regime, grows at a decreasing rate. A cohesive zone formulation is used to model the static and fatigue delamination growth, good agreement...master thesis 2018
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Berkel, Alex (author)This master thesis research investigates the possibility to repair carbon fiber thermoplastic aircraft<br/>structures using induction welding. Carbon fiber is conductive and heats up when placed inside an<br/>alternating magnetic field. A generator, coil, and pressure frame are needed to perform induction<br/>welding. The support plates needed...master thesis 2018
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Wang, Yuanyuan (author)Thick composite laminates can be used in aerospace and automotive industry replacing metals for weight saving.<br/>Increasing the thickness can bring more defects, like voids.<br/>This master thesis focuses on the multi-scale voids prediction and their mechanical effect simulation of thick composite laminates manufacturing by \ac{RTM}.<br/>It...master thesis 2018
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Koeman, Jurrien (author)Delamination is one of the failure modes of composites prone to happen in the case of a car crash. In the early stages of car design, finite element analysis is used as a tool to analyze structural concepts. In order to model delamination in a newly developed material model, it is analyzed in two parts: detection and effects of delamination. To...master thesis 2017
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Kamath, Shreya (author)Over the past decade, wind turbine towers have grown taller and wider to support high capacity turbines. It may, therefore, be prudent to investigate materials alternative to steel to mitigate an increase in tower mass, cost, and complexities in transportation & manufacturing associated with the steel towers. The current research focuses on...master thesis 2017
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Lapoutre, Gerwin (author)Offshore wind turbines are used more and more for the production of our electricity. The wind turbines are located in a remote and harsh environment, and are subject to heavy cyclic loading, which may cause fatigue in the support structures. Periodic inspections are required to assess the structural health of the wind turbines. Acoustic Emission...master thesis 2017
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Morgado Martins Filipe, Tiago (author)With increasing usage of fibre-reinforced composites for structural components across the automotive and aerospace industry, it became crucial to understand how this kind of materials behave when subjected to high loading rates, which are encountered in the case of crash events. <br/>The current work presents a study on the effect of the strain...master thesis 2017
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Walraet, Stef (author)Efficient design of woven composite structures is limited by a knowledge gap in predictive modeling of their behaviour. Fatigue modeling in particular is difficult and limited by a lack of experimental data. For compression-compression (C-C) or tension-compression (T-C) fatigue, experimental results in literature are uncommon. In this master...master thesis 2017
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Papenhuijzen, W.M. (author)A method has been developed for designing composite 3D skeletal structures. This method can be used to design weight optimized fiber reinforced structures that can carry complex loads in high performance applications such as satellites. These designs are realized through Size, Shape and Topology Optimization, using a ground structure approach as...master thesis 2017
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