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Xu, F. (author), Hajibeygi, H. (author), Sluys, Lambertus J. (author)Altering the state of the stress of the subsurface reservoirs can lead fractures to slip and extend their lengths (i.e., to propagate). This process can even be engineered, in many applications, e.g., enhanced geothermal systems. As such, accurate and efficient simulation of the mechanical deformation of the subsurface geological reservoirs,...conference paper 2022
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li Piani, T. (author), Weerheijm, J. (author), Peroni, M. (author), Koene, L. (author), Solomos, G. (author), Sluys, Lambertus J. (author)Adobe is one of the most ancient forms of masonry. Adobe bricks are sundried mixtures of clay, silt, sand and natural fibres locally available joined together using mud mortar. Adobe structures are largely spread in areas of the world prone to earthquakes or involved in military conflicts. Unfortunately, almost no literature concerns the dynamic...conference paper 2019
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li Piani, T. (author), Weerheijm, J. (author), Koene, L. (author), Sluys, Lambertus J. (author)A significant number of published papers in the field of penetration mechanics devotes attention to the study of targets made of metal and ceramic materials for protective equipment. In recent times, the progression in harshness of urban warfare is leading western governments to investing in research focused on the ballistic response of building...conference paper 2017
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Liu, Y. (author), van der Meer, F.P. (author), Sluys, Lambertus J. (author)In this paper, the thick-level-set method is used to model stable and unstable (stick/slip) crack propagation in the dynamic double cantilever beam (DCB) test for unidirectional composite laminates. The thick-level-set method uses a predefined damage profile to describe the fracture process zone and allows<br/>for accurate evaluation of the...conference paper 2017
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Latifi, M. (author), van der Meer, F.P. (author), Sluys, Lambertus J. (author)This paper presents a new discontinuous damage model for simulating fatigue-driven delamination in composites. Fatigue models commonly describe crack growth using the Paris law which provides the link between the energy released due to delamination and the crack growth rate. A core issue in implementing the Paris law is to accurately compute the...conference paper 2016
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Pereira, Luis (author), Weerheijm, J. (author), Sluys, Lambertus J. (author)Stress-based nonlocal model, Damage, Rate dependency, Dynamic crack-branching Abstract. In concrete often complex fracture and fragmentation patterns develop when subjected to high straining loads. The proper simulation of the dynamic cracking process in concrete is crucial for good predictions of the residual bearing capacity of structures in...conference paper 2016
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Simons, E.C. (author), Weerheijm, J. (author), Sluys, Lambertus J. (author)The Johnson-Holmquist-2 ceramic model is used for quasi-static indentation simulation. A modification is proposed to an associated plasticity formulation. This allows for a fully implicit solution scheme, where dilatation is used instead of the traditional explicit bulking formulation. Dilatation is shown to have an important influence on ring...conference paper 2016
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Rocha, I.B.C.M. (author), Raijmaekers, S (author), Nijssen, RPL (author), van der Meer, F.P. (author), Sluys, Lambertus J. (author)In this work, a combined experimental/numerical approach is used to investigate the effect of water ingression in glass/epoxy composite specimens. Interlaminar shear (ILS) specimens were immersed at 50◦C for multiple durations and tested. Re-dried specimens were also tested. Significant strength degradation of up to 50% was found for wet...conference paper 2016
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Rocha, I.B.C.M. (author), Raijmaekers, S (author), Nijssen, RPL (author), van der Meer, F.P. (author), Sluys, Lambertus J. (author)In this work a glass/epoxy composite commonly used in wind turbine blades is exposed to a humid environment at an elevated temperature. To research the anisotropic di_usion behaviour observed in unidirectional composite specimens, experimental results of slices cut along the three directional planes of the laminate immersed in demineralised...conference paper 2016
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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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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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Li, K. (author), Stroeven, P. (author), Stroeven, M. (author), Sluys, L.J. (author)Permeability of virtual cement seems to exceed experimental data by several orders of magnitude. The differences may actually not be that dramatic, since experimental samples are in practice not always fully saturated as generally assumed. This paper demonstrates that this has enormous effects on permeability. A numerical study is conducted on...conference paper 2015
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Lahuerta, F. (author), Nijssen, R.P.L. (author), Van der Meer, F.P. (author), Sluys, L.J. (author)Thick laminates are increasingly present in large composites structures such as wind turbine blades. Different factors are suspected to be involved in the decreased static and dynamic performance of thick laminates. These include the effect of self-heating, the scaling effect, and the manufacturing process influence. The aim of this work is to...conference paper 2015
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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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Lloberas-Valls, O. (author), Everdij, F.P.X. (author), Rixen, D.J. (author), Simone, A. (author), Sluys, L.J. (author)In this contribution, dual and primal domain decomposition techniques are studied for the multiscale analysis of failure in quasi-brittle materials. The multiscale strategy essentially consists in decomposing the structure into a number of nonoverlapping domains and considering a refined spatial resolution where needed. In multiscale analysis of...conference paper 2014
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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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Sluys, L.J. (author), Van der Meer, F.P. (author)On the microlevel, cusps are formed during delamination crack growth under mode II loading conditions. In this work, two different approaches to simulate this process are presented. Firstly a cohesive zone method where cohesive segments are introduced between a pair of neighbouring elements when the traction between those elements exceeds the...conference paper 2014
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- Ahmed, A. (author), Sluys, L.J. (author) conference paper 2014
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- Lahuerta Calahorra, F. (author), Westphal, T. (author), Nijssen, R.P.L. (author), Van der Meer, F.P. (author), Sluys, L.J. (author) conference paper 2014
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Lahuerta, F. (author), Westphal, T. (author), Nijssen, RPL (author), van der Meer, F.P. (author), Sluys, Lambertus J. (author)The aim of this work is to study the thickness effect in static and fatigue tests of glass-fibre unidirectional compression coupons. For this purpose, the self-heating effect, the effect of specimen geometry, and the influence of the manufacturing processes have been minimized. A scaled thickness compression coupon has been designed with the...conference paper 2014