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Magalhaes Pereira, L.F. (author), Weerheijm, J. (author), Sluys, L.J. (author)The development of realistic numerical tools to efficiently model the response of concrete structures subjected to close-in detonations and high velocity impacts has been one of the major quests in defense research. Under these loading conditions, quasi-brittle materials undergo a multitude of failure (damage) mechanisms. Dynamic tensile failure...conference paper 2015
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- Ahmed, A. (author), Sluys, L.J. (author) conference paper 2013
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Karamnejad, A. (author), Sluys, L.J. (author)Macroscopic behavior of quasi-brittle materials is determined by their heterogeneous microstructure. Initiation and propagation of cracks are controlled by the randomness of the material and occur at different length scales (figure 1). Multi-scale approaches provide methodologies to obtain the mechanical behavior of a heterogeneous material from...conference paper 2013
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Mercatoris, B.C.N. (author), Massart, T.J. (author), Sluys, L.J. (author)This contribution discusses a coupled two-scale framework for hydro-mechanical problems in saturated heterogeneous porous geomaterials. The heterogeneous nature of such materials can lead to an anisotropy of the hydro-mechanical couplings and non-linear effects. Based on an assumed model of the mesostructure, the average macroscopic hydro...conference paper 2013
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Lloberas Valls, O. (author), Everdij, F.P.X. (author), Rixen, D.J. (author), Simone, A. (author), Sluys, L.J. (author)The multiscale framework presented in [1, 2] is assessed in this contribution for a study of random heterogeneous materials. Results are compared to direct numerical simulations (DNS) and the sensitivity to user-defined parameters such as the domain decomposition type and initial coarse scale resolution is reported. The parallel performance of...conference paper 2013
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- Talebian, M. (author), Al-Khoury, R.I.N. (author), Sluys, L.J. (author) conference paper 2012
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Lloberas Valls, O. (author), Rixen, D.J. (author), Simone, A. (author), Sluys, L.J. (author), Stroeven, M. (author)In this study a FETI: Finite Element Tearing and Interconnecting [1] technique is adopted and exploited for the efficient and accurate modeling of softening materials such as concrete and rock. A fie scale analysis in which concrete is modelled as a three-phase material is used. Special attention is given to the treatment of linear and non...conference paper 2009
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Le, N.L.B. (author), Stroeven, P. (author), Stroeven, M. (author), Sluys, L.J. (author)Details of a complete methodology for porosimetry of virtual concrete have been described in a series of publications. This paper shortly sketches the main characteristics, whereupon it is indicated how a pore network model is designed based on data extracted from the virtual cement paste. This involves smoothing the main trunks as the main pore...conference paper 2015
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Talebian, M. (author), Al-Khoury, R.I.N. (author), Sluys, L.J. (author)This paper presents an efficient computational model for the simulation of fully coupled two-phase flow in a deformed partially saturated formation. Focus is placed on modeling the flow of a CO2 plume in a porous medium. The numerical procedure is based on coupling between the Level-set method (LS) and the extended finite element method (XFEM)....conference paper 2011
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- Ahmed, A. (author), Sluys, L.J. (author) conference paper 2012
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- Van der Meer, F.P. (author), Sluys, L.J. (author) conference paper 2009
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Ahmed, A. (author), Sluys, L.J. (author)Numerical analysis of progressive damage in fiber-reinforced laminated composite plates is a challenge due to the presence of different, complex failure mechanisms and their mutual interaction. A meso-scopic progressive failure model is presented to simulate interacting damage mechanisms (matrix cracking and delamination) in laminated composite...conference paper 2013
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Latifi, M. (author), Van der Meer, F.P. (author), Sluys, L.J. (author)This paper presents a new damage model for simulating fatigue-driven delamination in composite laminates. This model is developed based on the Thick Level Set approach (TLS) and provides a favorable link between damage mechanics and fracture mechanics through the non-local evaluation of the energy release rate. Previously, this approach has been...conference paper 2015
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- Karamnejad, A. (author), Sluys, L.J. (author), Nguyen, V.P. (author) conference paper 2012
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Vandoren, B. (author), De Proft, K. (author), Simone, A. (author), Sluys, L.J. (author)A mesoscopic masonry model is presented using the partition of unity finite element method. Joints are only explicitly introduced when a critical stress state is exceeded, resulting in a computationally more efficient procedure when compared to models in which all joints are a priori active. The performance of the presented model is demonstrated...conference paper 2013
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- Musivand Arzanfudi, M. (author), Al-Khoury, R.I.N. (author), Sluys, L.J. (author) conference paper 2014
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De Proft, K. (author), Heyens, K. (author), Sluys, L.J. (author)This paper uses the Generalized Finite Element method for the introduction of the cohesive joint behaviour to model masonry. Cracked joints are modelled as displacement discontinuities and are introduced in the finite element model by additional degrees of freedom. These degrees of freedom are activated when the stress state in the joint reaches...conference paper 2009
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Stroeven, P. (author), Le, N.L.B. (author), Stroeven, M. (author), Sluys, L.J. (author)The paper introduces a novel approach to porosimetry in virtual concrete, denoted as random node structuring (RNS). The fresh state of this particulate material is produced by the DEM system HADES. Hydration simulation is a hybrid approach making use of wellknown discretization and vector methods. Particle interferences (overlap) in the dynamic...conference paper 2011
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Lloberas Valls, O. (author), Rixen, D.J. (author), Simone, A. (author), Sluys, L.J. (author)In this contribution we describe a methodology for the multiscale analysis of heterogeneous quasi-brittle materials. The algorithm is based on the finite element tearing and interconnecting FETI [1] method cast in a non-linear setting. Adaptive multiscale analysis is accounted for with the use of selective refinement at domains that undergo...conference paper 2011
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Heyens, K. (author), De Proft, K. (author), Sluys, L.J. (author)A smooth yield surface for the modelling of masonry on mesoscopic scale is presented, using interpolation by second order Bzier curves. The cracked joints are modelled as displacement discontinuities using the partition of unity property of finite element shape functions.conference paper 2009