Pages
- 1
- 2
- document
-
Wu, W. (author), Veljkovic, M. (author), Kolstein, M.H. (author), Maljaars, Johan (author), Pijpers, Richard (author)Fatigue cracks in the stiffener-to-deck plate connections of orthotropic bridge decks, initiating from the weld toe or root and propagating into the stiffener or weld throat, are experimentally and numerically studied. A statistical analysis of the structural stress is carried out using the experimental data. Automatic welded specimens show a...journal article 2024
- document
-
Wu, W. (author), Veljkovic, M. (author), Kolstein, M.H. (author), Pijpers, Richard (author), Maljaars, Johan (author)Steel Orthotropic Bridge Decks (OBDs) are widely used in long-span and movable bridges. Fatigue resistance analysis plays an important role in the design or assessment of OBDs. One possible fatigue failure is the crack initiating from the weld root of stiffener-to-deck plate connections at crossbeams. A full-scale experimental investigation...journal article 2024
- document
-
Maljaars, Johan (author), Pijpers, Richard (author), Wu, W. (author), Kolstein, M.H. (author)This study derives the fatigue resistance of welded details in orthotropic decks using structural stress (hot-spot stress where possible) based on tests described in literature and tests by the authors. The data are supported with linear elastic fracture mechanics simulations. Details covered are the rib to deck weld, the crossbeam to deck...journal article 2023
- document
-
van Unen, Vincent (author), Ouboter, Laura F. (author), Li, Na (author), Schreurs, Mette (author), Abdelaal, T.R.M. (author), Kooy-Winkelaar, Yvonne (author), Beyrend, Guillaume (author), Höllt, T. (author), Maljaars, P. W.Jeroen (author), Mearin, M. Luisa (author), Mahfouz, A.M.E.T.A. (author), Witte, Anne M.C. (author), Clemens, Cornelis H.M. (author), Abraham, Sunje (author), Escher, Johanna C. (author), Lelieveldt, B.P.F. (author), Pascutti, M. Fernanda (author), van der Meulen – de Jong, Andrea E. (author), Koning, Frits (author)Chronic intestinal inflammation underlies inflammatory bowel disease (IBD). Previous studies indicated alterations in the cellular immune system; however, it has been challenging to interrogate the role of all immune cell subsets simultaneously. Therefore, we aimed to identify immune cell types associated with inflammation in IBD using high...journal article 2022
- document
-
Maljaars, Johan (author), Rózsás, Árpád (author), Walters, C.L. (author), Slot, Henk (author)The failure assessment line (FAL) describes the interaction between plastic failure and fracture of flawed steel components subjected to tension or bending. This paper quantifies the model uncertainty of the FAL as provided in the internationally used British Standard BS 7910:2019 by comparing the assessment with the actual failure load of 82...journal article 2022
- document
-
Maljaars, J.M. (author), Richardson, Chris N. (author), Sime, Nathan (author)This paper introduces LEOPART, an add-on for the open-source finite element software library FENICS to seamlessly integrate Lagrangian particle functionality with (Eulerian) mesh-based finite element (FE) approaches. LEOPART- which is so much as to say: ‘Lagrangian–Eulerian on Particles’ - contains tools for efficient, accurate and scalable...journal article 2021
- document
-
Dekker, R. (author), van der Meer, F.P. (author), Maljaars, Johan (author), Sluys, Lambertus J. (author)A numerical model for corrosion pit propagation under mechanical loading is presented. The level set method is used for corrosion front tracking and also enables the domain to be split into a solid and a pit domain. In the pit the diffusion of atoms originating from the dissolution process occurring at the pit front is simulated. The model is...journal article 2021
- document
-
Sime, Nathan (author), Maljaars, J.M. (author), Wilson, Cian R. (author), van Keken, Peter E. (author)Tracer methods are widespread in computational geodynamics for modeling the advection of chemical data. However, they present certain numerical challenges, especially when used over long periods of simulation time. We address two of these in this work: the necessity for mass conservation of chemical composition fields and the need for the...journal article 2021
- document
-
Dekker, R. (author), van der Meer, F.P. (author), Maljaars, J. (author), Sluys, Lambertus J. (author)This study presents calibration and validation of a cohesive extended finite element model for fatigue crack propagation in ductile materials. The approach relies on a separation between plasticity around the crack tip and fatigue crack growth at the crack tip such that the influence of plasticity on fatigue driving forces is predicted. This...journal article 2021
- document
-
Maljaars, P.J. (author), Grasso, N. (author), den Besten, J.H. (author), Kaminski, M.L. (author)The first part of the paper presents a partitioned fluid–structure interaction (FSI) coupling for the non-uniform flow hydro-elastic analysis of highly flexible propellers in cavitating and non-cavitating conditions. The chosen fluid model is a potential flow solved with a boundary element method (BEM). The structural sub-problem has been...journal article 2020
- document
-
Maljaars, J.M. (author), Labeur, R.J. (author), Trask, Nathaniel A. (author), Sulsky, Deborah L. (author)A particle-mesh strategy is presented for scalar transport problems which provides diffusion-free advection, conserves mass locally (i.e. cellwise) and exhibits optimal convergence on arbitrary polyhedral meshes. This is achieved by expressing the convective field naturally located on the Lagrangian particles as a mesh quantity by formulating a...conference paper 2020
- document
-
Maljaars, J.M. (author)This thesis presents a numerical framework for simulating advection-dominated flows which reconciles the advantages of Eulerian mesh-based schemes with those of a Lagrangian particle-based discretization strategy. Particularly, the strategy proposed in this thesis inherits the diffusion-free properties as in Lagrangian particle-based advection,...doctoral thesis 2019
- document
-
Maljaars, P.J. (author)Higher efficiencies, higher cavitation inception speeds and reduced acoustic signature are claimed benefits of flexible composite propellers. Analysing the hydrodynamic performance of these flexible propellers, implies that a coupled fluid-structure interaction (FSI) computation has to be performed. An FSI coupling can be monolithic, which means...doctoral thesis 2019
- document
-
Maljaars, P.J. (author), Kaminski, M.L. (author), den Besten, J.H. (author)A special type of fluid–structure interaction (FSI) problems are problems with periodic boundary conditions like in turbomachinery. The steady state FSI response of these problems is usually calculated with similar techniques as used for transient FSI analyses. This means that, when the fluid and structure problem are not simultaneously...journal article 2019
- document
-
Dekker, R. (author), van der Meer, F.P. (author), Maljaars, J. (author), Sluys, Lambertus J. (author)Structures are subjected to cyclic loads that can vary in direction and magnitude, causing constant amplitude mode I simulations to be too simplistic. This study presents a new approach for fatigue crack propagation in ductile materials that can capture mixed-mode loading and overloading. The extended finite element method is used to deal with...journal article 2019
- document
-
Maljaars, J.M. (author), Labeur, R.J. (author), Trask, Nathaniel (author), Sulsky, Deborah (author)By combining concepts from particle-in-cell (PIC) and hybridized discontinuous Galerkin (HDG) methods, we present a particle–mesh scheme for flow and transport problems which allows for diffusion-free advection while satisfying mass and momentum conservation – locally and globally – and extending to high-order spatial accuracy. This is achieved...journal article 2019
- document
-
Maljaars, J.M. (author), Labeur, R.J. (author), Möller, M. (author)A generic particle–mesh method using a hybridized discontinuous Galerkin (HDG) framework is presented and validated for the solution of the incompressible Navier–Stokes equations. Building upon particle-in-cell concepts, the method is formulated in terms of an operator splitting technique in which Lagrangian particles are used to discretize...journal article 2018
- document
-
Maljaars, P.J. (author), Bronswijk, L.M.E. (author), Windt, Jaap (author), Grasso, Nicola (author), Kaminski, M.L. (author)In the past several decades, many papers have been published on fluid–structure coupled calculations to analyse the hydro-elastic response of flexible (composite) propellers. The flow is usually modelled either by the Navier–Stokes equations or as a potential flow, by assuming an irrotational flow. Phenomena as separation of the flow, flow...journal article 2018
- document
-
Maljaars, P.J. (author), Kaminski, M.L. (author), den Besten, J.H. (author)Boundary element methods (BEM) have been used for propeller hydrodynamic calculations since the 1990s. More recently, these methods are being used in combination with finite element methods (FEM) in order to calculate flexible propeller fluid–structure interaction (FSI) response. The main advantage of using BEM for flexible propeller FSI...journal article 2018
- document
-
Kosgodagan-Dalla Torre, Alex (author), Yeung, Thomas G. (author), Morales Napoles, O. (author), Castanier, Bruno (author), Maljaars, J. (author), Courage, WMG (author)Modeling the stochastic evolution of a largescale fleet or network generally proves to be challenging. This difficulty may be compounded through complex relationships between various assets in the network. Although a great number of probabilistic graph-based models (e.g., Bayesian networks) have been developed recently to describe the behavior...journal article 2017
Pages
- 1
- 2