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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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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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Dias-da-Costa, D. (author), Alfaiate, J. (author), Sluys, L.J. (author), Julio, E. (author)Several local embedded discontinuity formulations have already been developed, in which constant strain triangles and constant jumps are adopted. However, these formulations lead to jump and traction discontinuity across element boundaries and stress locking effects. Herein, a new contribution to embedded strong discontinuities is given. A...conference paper 2010
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Lloberas Valls, O. (author), Rixen, D.J. (author), Simone, A. (author), Sluys, L.J. (author)In this contribution we present a multiscale framework for the analysis of brittle materials based on domain decomposition approaches. In particular, the FETI (Finite Element Tearing and Interconnecting) [1] method is selected to solve the decomposed structure. We start our analysis at a coarse level were effective properties are assigned to the...conference paper 2010
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- Van der Meer, F.P. (author), Sluys, L.J. (author) conference paper 2009
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- Radtke, F.K.F. (author), Simone, A. (author), Sluys, L.J. (author) conference paper 2009
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Moonen, P. (author), Sluys, L.J. (author), Carmeliet, J. (author)A continuous-discontinuous approach to simulate failure is presented. The formulation covers both diffuse damage processes in the bulk material as well as the initiation and propagation of discrete cracks. Comparison with experimental data on layered sandstone shows that the modeling strategy accurately captures the physics of the failure process.conference paper 2009
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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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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
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Nguyen, V.P. (author), Stroeven, M. (author), Sluys, L.J. (author)In this contribution, we present the mechanical behaviour of the hardening cement paste explicitly taking into account its complex microstructure. The microstructure of the cement paste is obtained via numerical cement hydration simulation. A simple nonlocal isotropic damage model is adopted for different constituents of the cement paste. The...conference paper 2009
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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 study of softening brittle materials at different scales of observation. The goal is to account for a higher resolution at those areas that undergo the non-linear processes. We apply the FETI (Finite Element Tearing and Interconnecting) technique to glue different domain resolutions during...conference paper 2009
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Dias-da-Costa, D. (author), Alfaiate, J. (author), Júlio, E. (author), Sluys, L.J. (author)Some of the most used strengthening techniques for reinforced concrete structures include the increase of existing cross-sections. The monolithic behaviour of the strengthened elements depends basically on the interface between the substrate and the new concrete layer. A complete numerical model capable of dealing with the composite response of...conference paper 2009
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Radtke, F.K.F. (author), Simone, A. (author), Sluys, L.J. (author)We present two approaches to model fibre reinforced concrete. In both approaches, discrete fibre distributions and the behaviour of the fibre-matrix interface are explicitly considered. One approach employs the reaction forces from fibre to matrix while the other is based on the partition of unity finite element method. In none of the methods...conference paper 2009
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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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Lloberas Valls, O. (author), Simone, A. (author), Sluys, L.J. (author)This paper presents an assessment of a two-scale framework for the study of softening materials. The procedure is based on a hierarchical Finite Element (FE) scheme in which computations are performed both at macro and mesoscopic scale levels. The methodology is chosen specifically to remain valid when the scales are coupled which is frequently...conference paper 2008
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- De Borst, R. (author), Carmeliet, J. (author), Pamin, J. (author), Sluys, L.J. (author) conference paper 1994
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- Sluys, L.J. (author), De Borst, R. (author) conference paper 1992
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- Sluys, L.J. (author), De Borst, R. (author) conference paper 1991