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Ballemans, Maartje (author)Dressings like mayonnaise can be stored in different ways. A popular way is in a rigid plastic bottle made from PET with a PP closure. This packaging can be designed top-up (the closure is on top of the bottle) or top-down (the bottle stands on the closure). The top-down rigid plastic packaging is the most used by Unilever for their dressings....master thesis 2023
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van Dooren, K.S. (author), Tijs, B.H.A.H. (author), Waleson, J. E.A. (author), Bisagni, C. (author)Two aeronautical thermoplastic composite stiffened panels are analysed and tested to investigate the buckling behaviour, the skin-stringer separation and the final failure mode. The panels are made of fast crystallising polyetherketoneketone carbon composite, have three stringers with an angled cap on one side, and are joined to the skin by a...journal article 2023
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Xin, Haohui (author), Liu, Jielin (author), Correia, J.A.F.O. (author), Berto, Filippo (author), Veljkovic, M. (author), Qian, Guian (author)In this paper, a numerical simulation method of mixed-mode fatigue crack propagation was explored using the extended finite element method (XFEM) and the Virtual Crack Closure Technique (VCCT). Both 2D and 3D numerical models were selected to simulate the fatigue crack propagation of steel specimens. Two coefficients were proposed to...journal article 2023
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JACOB, JOSEPH (author)Many immersed tunnels have already reached or are about to reach the halfway point of their intended lifespan of 100 years. Around this time, several structural problems were noticed during inspection which have led to performance deterioration and durability issues of the tunnel. Often large- scale maintenance was required to meet the design...master thesis 2022
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van Kuijk, J.J.A. (author)Fatigue crack growth in metals has been studied intensively for more than half a century. This research field has been closely connected to the engineering industry throughout history. It is therefore no surprise that the main focus has mostly been on developing better prediction models rather than on understanding the phenomenon of fatigue...doctoral thesis 2022
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Park, ChangKyu (author)Studies revolving around data-driven methods have been on a rise in recent years to improve highly modelled methods such as the two-equation turbulence models of Reynolds-averaged Navier-Stokes (RANS). Similarly, such data-driven methods are implemented into partially-averaged Navier-Stokes (PANS). PANS is a young bridging method that fulfils...master thesis 2022
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Eker, Turhan (author)In this thesis, a modelling approach to model soot emissions for a Rich Burn-Quick Quench- Lean Burn (RQL) type aero engine combustion chamber will be presented. The sot emissions will be modelled by coupling Chemical Reactor Network (CRN) approach with Method of Moments with Interpolative Closure (MOMIC), a detailed soot formation model. The...master thesis 2022
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Hadler, Noah (author)From three coherent SAR images it is possible to estimate three interferograms. Combined in a circular way, the sum of the three interferometric phases is called the closure phase which necessarily adds up to zero on a single pixel level. However, if the interferograms are spatially averaged, phase consistency is not guaranteed. In most of the...master thesis 2022
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Pedrosa, Bruno (author), Correia, J.H.G. (author), Lesiuk, Grzegorz (author), Rebelo, Carlos (author), Veljkovic, M. (author)The UniGrow model is an analytical procedure to assess the fatigue crack growth based on elastic–plastic crack tip stresses and strains. The assumption is that fatigue crack growth (FCG) can be considered as a process of successive crack re-initiations resulting from material damage in the crack tip zone. The main parameters of this model are...journal article 2022
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Yap, M.D. (author), Cats, O. (author)Urban metro and tram networks are regularly subject to planned disruptions, including closures, resulting from the need to maintain and renew infrastructure. In this study, we first empirically analyse the passenger demand response to planned public transport disruptions based on individual passenger travel behaviour, based on which we infer...journal article 2022
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Feng, W. (author), He, P. (author), Koetsier, M. (author), Pavlovic, M. (author)Wrapped composite joint is an innovative technique which connects steel hollow sections through bonding such that the fatigue performance is improved compared to welded joint. In this paper, a DIC-based method of monitoring surface strains is proposed to quantify the debonding crack propagation within the composite wrap layers during high cycle...conference paper 2022
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van 't Hof, Nathan (author)The purpose of this research study is to analyse the effect of the design of mechanical fastener on their effectiveness as Disbond Arrest Features (DAFs). This was done by means of a sensitivity study using a 3D model using the Virtual Crack Closure Technique (VCCT) to model the disbond growth of a single lap shear specimen comparing the Strain...master thesis 2021
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Ton, A.M. (author), Vuik, V. (author), Aarninkhof, S.G.J. (author)The morphodynamic behaviour of low-energy beaches is poorly understood, compared to that of exposed coasts. This study analyses the morphological development of sandy, low-energy beaches and the steering hydrodynamic processes. Four densely-monitored study sites in the non-tidal lake Markermeer in the Netherlands offered a unique opportunity...journal article 2021
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van Kuijk, J.J.A. (author), Alderliesten, R.C. (author), Benedictus, R. (author)The substantiation of fatigue crack closure corrections is disputed, based on the closure stress definition. The ΔK<sub>eff</sub> equation lacks a physical explanation. An inconsistency is observed between the opening stress S<sub>op<sub>phen</sub></sub> as used by this equation and the physical opening stress S<sub>op<sub>phys</sub></sub>....journal article 2021
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Xin, H. (author), Correia, José A.F.O. (author), Veljkovic, M. (author)The assessment of fatigue crack propagation of steel structures is essential and important especially to improve the application of high strength steel in construction. The load ratio R, reflecting mean stress effects, will be changed with crack extension in the steel structures with complicated geometry. In this paper, the Walker equation is...journal article 2021
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van Kuijk, J.J.A. (author), Alderliesten, R.C. (author), Benedictus, R. (author)To improve resolution of in-situ measurement of crack closure and opening in fatigue, potential drop (PD) measurement technique has been further developed to measure thousands of times through each load cycle with high precision. The results are interpreted with physical phenomena like strain, Poisson's effect, piezo-resistivity, plasticity,...journal article 2021
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Colina Alonso, A. (author), van Maren, D.S. (author), Elias, E. P.L. (author), Holthuijsen, S. J. (author), Wang, Zhengbing (author)Human interventions and climate change can heavily influence the large-scale morphological development of tidal basins. This has implications on sediment management strategies, as well as ecological and recreational purposes. Examples of heavily impacted tidal basins are those in the Western Dutch Wadden Sea. The closure of a large sub-basin...journal article 2021
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Del Pia, Alberto (author), Gijswijt, D.C. (author), Linderoth, Jeff (author), Zhu, Haoran (author)An integer packing set is a set of non-negative integer vectors with the property that, if a vector x is in the set, then every non-negative integer vector y with y≤x is in the set as well. The main result of this paper is that integer packing sets, ordered by inclusion, form a well-quasi-ordering. This result allows us to answer a recently...journal article 2021
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De Zan, Francesco (author), Rocca, Fabio (author), Ferretti, Alessandro (author), Lopez Dekker, F.J. (author), Eineder, Michael (author)A recent publication claims that closure phases in SAR interferometry bear no relationship to physical changes of the scatterer, but only to the statistical properties of the averaged pixels. We disprove this claim with a simple counterexample and remind the reader of cases in which closure phases indicate a clear physical content, including...journal article 2021
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Leung, K.C. (author)A low-speed aerodynamic analysis on the conventional NACA ram-air inlet of the Airbus A320 with a new closure flap was conducted. The conventional closure flap mechanism inside the NACA ram-air inlet is replaced by a morphing plate design. Steady-state Reynolds-Averaged Navier-Stokes (RANS) based Computational Fluid Dynamics (CFD) simulations...master thesis 2020