Searched for: faculty%3A%22Civil%255C%252BEngineering%255C%252Band%255C%252BGeosciences%22
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- Sluys, L.J. (author) doctoral thesis 1992
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Wells, G.N. (author), Sluys, L.J. (author)Embedded discontinuity formulations have been recently presented as a method of incorporating displacement discontinuities in standard finite elements. These elements allow inelastic deformations to be modelled using discrete constitutive models at an internal interface. However, the actual formulation of these models is identical in concept to...journal article 2001
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De Proft, K. (author), Wells, G.N. (author), Sluys, L.J. (author), De Wilde, H.P. (author)In this paper, a combined experimental-computational study of a double-edge notched specimen subjected to tensile loading is presented. In the experimental part, the loaddeformation response and the displacement field around the crack tip are recorded. An Electronic Speckle Pattern Interferometer (ESPI) is used to obtain the local displacement...journal article 2002
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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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Guo, Z. (author), Sluys, L.J. (author)The simulation of rubber-like material behaviour by means of the finite element method has been described in this study. Proper material models were selected for the numerical description of static hyper-elasticity. The combinations of a continuum damage mechanics concept and a pseudo-elastic concept with Gao's elastic law were used to simulate...journal article 2008
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Pannachet, T. (author), Askes, H. (author), Sluys, L.J. (author)An error estimator, formulated earlier for h-adaptive strategies, is extended for use in the p-version finite element analysis. The estimation of error is based on solving a series of local problems, based on patches consisting of elements surrounding each node, with prescribed homogeneous essential boundary conditions. Unlike the original...journal article 2008
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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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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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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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Dias-da-Costa, D. (author), Alfaiate, J. (author), Sluys, L.J. (author), Julio, E. (author)In this paper, three different approaches used to model strong discontinuities are studied: a new strong embedded discontinuity technique, designated as the discrete strong embedded discontinuity approach (DSDA), introduced in Dias-da-Costa et al. (Eng Fract Mech 76(9):1176–1201, 2009); the generalized finite element method, (GFEM), developed by...journal article 2009
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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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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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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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Moonen, P. (author), Sluys, L.J. (author), Carmeliet, J. (author)A macroscopic framework to model heat transfer in materials and composites, subjected to physical degradation, is proposed. The framework employs the partition of unity concept and captures the change from conduction-dominated transfer in the initial continuum state to convection and radiation-dominated transfer in the damaged state. The...journal article 2011
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