Searched for: department%3A%22Aerospace%255C+Structures%255C+and%255C+Materials%22
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Sevenois, R.D.B. (author)
To allow structural designs with lower mass, it is necessary to have access to accurate failure prediction theories for composite plates with holes subjected to arbitrary loading conditions. For design purposes, however, the most accurate failure theories require a considerable amount of computational resources which is often not available....
master thesis 2013
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Van Beurden, M.Q.C. (author)
Ultrasonic welding (USW) is a technique used to bond materials together by heating the bonding surfaces with ultrasound. Its main advantage is the high processing speed, which is in the order of seconds. However, application of this technique with thermoplastic composite (TPC) materials is still limited. One of the areas in which almost no...
master thesis 2015
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Ratan Parkhe, K.K. (author)
The importance of aeroelastic tailoring is increasing continuously as the aircraft wings become more and more flexible. Incorporating aeroelastic considerations in the early part of the design process has a lot of benefits. But these require significant computational resources if accurate predictions are needed. This is more relevant these days...
master thesis 2016
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Salden, P.H.W. (author)
Topology optimization is an automated design approach for structural applications that is gaining popularity in industry, including the aerospace sector. Resulting designs can be made suitable for traditional manufacturing techniques, although it is a technique that is particularly useful for non-conventional approaches such as additive...
master thesis 2016
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Dekker, R. (author)
Localized buckles can occur in crashes when compressive stresses are dominant. However, due to their local appearance, they might be overlooked by a finite element analysis, meaning that local failure due to buckling will not be predicted. Methods to analytically assess the onset of such buckles are readily available. However, an off-the-shelf...
master thesis 2016
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De Jong, T.A. (author)
Topology optimization is the process of optimizing both the material layout and the connectivity inside a design domain. The first paper on topology optimization dates back to 1904, when the Australian inventor Michell derived optimality criteria for minimum weight truss structures. In 1988 Bendsøe and Kikuchi published the pioneering paper ...
master thesis 2016
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Tonnaer, R. (author)
The strict quality requirements for aerospace composite structures give rise to costly quality control procedures. In automated fibre placement (AFP) these procedures rely heavily on manualwork and inspection. This research aims at performing preventative non-destructive evaluation of composite laminate quality based on an online geometric...
master thesis 2016
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Wolken, M. (author)
A surrogate model is used to predict the energy dissipation response for a rectangular beam, initiated by an axial impact. This method is used for one type of steel, after which a generalization is performed to make it available for multiple types of metal.
master thesis 2017
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Geutjens, R. (author)
The development of humanity has led to an increase in energy demand. To keep up with this need, scientists and engineers are constantly pushing the limits of technology to develop lighter, stronger and more energy efficient devices. Some recent developments in magnetocaloric materials have made it possible to use the magnetocaloric effect for...
master thesis 2016
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Vargalui, A. (author)
Acoustic Emission (AE) based structural health monitoring systems have the potential to assess the state of metallic / composite structures and detect damage in real time as it grows. This is done by monitoring the Lamb waves that occur due to the release of energy and the specific boundary conditions. Environmental and Operational Conditions ...
master thesis 2015
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Subramanian, K. (author)
The high stiffness to weight ratio of fibre reinforced composites have been utilized in improving the performance of various structures conventionally designed using metals. One such application is the gangway of the Ampelmann system used to transfer personnel safely from and to the offshore platform in sea. In the current work, a preliminary...
master thesis 2016
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De Rooij, R. (author)
Membrane structures have a rich history of use across many disciplines and are widely used in aerospace and structural engineering applications. A few examples can be found in solar sails, atmospheric balloons and parachutes. These membranes have many advantages, including their ability to take complex shapes and their low mass to surface ratio,...
master thesis 2013
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Kempeneers, R.E.M. (author)
A good structural health monitoring system on a composite repair can improve the understanding of the life of such a repair. Currently, overwrap repairs are considered to be temporary in nature due to the unknown life expectancy. Using finite element modelling, a model was created of a pipe with a repaired defect and a composite overwrap. This...
master thesis 2013
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Dijkers, H.P.A. (author)
Artificially aged aluminium-lithium alloys have recently seen renewed interest in them in the aviation industry. They have a decreased density, while keeping or improving the fatigue properties compared to other aluminium alloys. Research shows that these aluminium-lithium and other advanced aluminium alloys exhibit crack turning and crack....
master thesis 2015
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Pasman, D.J. (author)
Solid round bars with a shoulder fillet are frequently used in engineering structures because it facilitates a smooth transition in thickness. However, the presence of shoulder fillets is currently neglected in the prediction of fatigue crack growth in engineering practice. Since stress concentrating locations like a shoulder fillet can have a...
master thesis 2015
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Floris, C.E. (author)
Damage in materials and structures is unavoidable, leading to the time deterioration of its functional properties (e.g. barrier, load bearing, aesthetics) and ultimate repair or replacement. Lifetime extension can be achieved by using materials with initially higher performance or using materials that can repair themselves (self-healing). The...
master thesis 2017
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Mishra, V. (author)
Automated fibre placement technology has made possible to place bands of composite fibre tows along curvilinear path to create laminates with spatially varying stiffness properties called variable stiffness panels. These panels have shown improvement in stiffness properties, buckling load and post buckling failure load, over conventional...
master thesis 2017
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Koot, M.J. (author)
Cost is a design driver in any commercial business, and this is not different in the wind energy industry. The potential of cost savings on wind turbine towers through lightweight composite designs has been shown. However composite grid stiffened and lattice structures, which were shown to lead to significant weight reductions in aerospace...
master thesis 2016
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Usman, M. (author)
In this research effect of temperature on the disbond growth rate due to fatigue load in adhesive bonds is investigated. Concept of release of strain energy has been used. In particular the effect of temperature on the relationship between disbond growth rate and strain energy released per load cycle has been investigated. The general trend...
master thesis 2016
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Dikici, T. (author)
The carbon fiber industry is nowadays developing new grades of fibers that combine the high mechanical performance of carbon fibers in composites with more attractive cost structure. These developments are in the direction of heavy tow carbon fibers with tow values ranging from 50 to 60K. Using heavy tow carbon fibers reduces the cost structure...
master thesis 2016
Searched for: department%3A%22Aerospace%255C+Structures%255C+and%255C+Materials%22
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