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Gärtner, T. (author), van den Boom, S. J. (author), Weerheijm, J. (author), Sluys, Lambertus J. (author)Lightweight materials used for impact mitigation must be able to resist impact and absorb the maximum amount of energy from the impactor. Auxetic materials have the potential to achieve high resistance by drawing material into the impact zone and providing higher indentation and shear resistance. However, these materials must be artificially...journal article 2024
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li Piani, T. (author), Weerheijm, J. (author), Sluys, Lambertus J. (author)Adobe is a traditional masonry made of sundried earthen bricks and mud mortar. Despite a millennial history of buildings of architectural value, adobe still connotes a so called ‘not engineered’ construction type. Namely, the material and structural properties of adobe are still not entirely addressed, resulting in an equally uncertain...journal article 2022
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- li Piani, T. (author), Weerheijm, J. (author), Sluys, Lambertus J. (author) journal article 2021
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li Piani, T. (author), Weerheijm, J. (author), Peroni, M. (author), Koene, L. (author), Krabbenborg, D. (author), Solomos, G. (author), Sluys, Lambertus J. (author)This paper presents the results of an experimental research aimed at assessing the material performance of adobe bricks in compression for a wide range of induced strain rates, from statics to high velocity impact. Adobe connotes a traditional masonry whose bricks are made of sundried soil mixtures possibly reinforced with natural fibres and...journal article 2020
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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), Sluys, Lambertus J. (author)Buildings and structures in many cities have recently been exposed to an increased number of highly dynamic hazards. These include not only floods and earthquakes but also man made threats such as ballistic impacts and blasts. Thus, the assessment of the dynamic performance of structures made of quasi-brittle materials must account also for high...abstract 2019
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Agar Ozbek, Ayda Safak (author), Pedersen, Ronnie Refstrup (author), Weerheijm, J. (author), van Breugel, K. (author)This study presents the numerical analyses conducted to investigate the impact behavior of different porous concretes, which have also been cast and tested experimentally. For a realistic representation of the real porous concretes containing arbitrary shaped air pores, a mesh generation code was developed in which the aggregates in the...journal article 2019
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Simons, E.C. (author), Weerheijm, J. (author), Sluys, Lambertus J. (author)Alumina ceramic is often used in armour systems. This material is known to have a brittle response under tensile loading, while a ductile response is found when sufficiently high pressures are reached. During projectile impact a ceramic material experiences both tensile loading and high pressures, hence fails in both a brittle and ductile way....journal article 2019
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li Piani, T. (author), Weerheijm, J. (author), Sluys, Lambertus J. (author)A local damage model has been recently developed for the numerical simulation of the static behaviour of adobe bricks. Mesh insensitivity of the local model was obtained by generalizing the damage delay concept based on a Dirichlet boundary condition decomposition integrated in an implicit solver. The regularization properties of the model...journal article 2019
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Agar Ozbek, Ayda Safak (author), Weerheijm, J. (author), van Breugel, K. (author)In this work, findings of a numerical study performed to investigate the impact behavior of porous concrete, modeled as a four phase cementitious composite consisting of aggregates, cement paste, interfacial transition zones (ITZ) and air, are presented. The numerical analyses contributed to the process of designing a special type of concrete...journal article 2019
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Simons, E.C. (author), Weerheijm, J. (author), Sluys, Lambertus J. (author)Plasticity models are frequently used to describe ceramic materials. Well established and often used ceramic models are those by Johnson and Holmquist. These are softening plasticity models for which mesh dependency is a well known problem. A viscosity or rate dependency can be added to the material model to provide regularization and solve...journal article 2018
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li Piani, T. (author), Weerheijm, J. (author), Koene, L. (author), Sluys, Lambertus J. (author)This paper presents a constitutive relationship to describe the uniaxial response in statics of brick and mortar samples of Adobe. This defines a traditional masonry whose components are made of soil mixture reinforced with fibres. Only recently Adobe has started attracting scientific attention, primarily as a consequence of the dramatic...abstract 2018
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Weerheijm, J. (author), Verreault, J. (author), van der Voort, M (author)Transportation of flammable liquefied gas in tunnels presents a significant risk of an accidental loss of containment leading to an explosion with major consequences. Possible scenarios include a BLEVE, a non-reactive gas expansion explosion and a reactive gas explosion. Quantification of the risk and consequences associated with such events...journal article 2018
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li Piani, T. (author), Weerheijm, J. (author), Sluys, Lambertus J. (author)In this paper, a new one-dimensional phenomenological model is developed for the assessment of the ballistic performance of Adobe. Adobe is a masonry largely spread in areas of the world involved in military operations. Addressing fundamental ballistic parameters such as residual velocity or penetration depth for this building technology is...journal article 2018
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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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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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Vegt, I. (author), Weerheijm, J. (author)Dynamic tests demonstrate an extensive rate effect on the tensile strength as well as the post-peak behaviour beyond loading rates of about 50 GPa/s. One of the possible explanations for the observed rate effects on the fracture behaviour is enhanced resistance by moisture in the pores. To study the influence of the moisture content and pore...conference paper 2016
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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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Magalhaes Pereira, L.F. (author), Weerheijm, J. (author), Sluys, L.J. (author)Security-sensitive structures, such as military facilities, government buildings, strategic industrial infrastructures, bridges, dams, etc. should be designed to withstand explosions and high velocity impacts, both from terrorist attacks and other acts of war. Since concrete is the most widely used construction material understanding concrete...lecture notes 2013
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