Searched for: author:"Weerheijm, J."
(1 - 20 of 87)

Pages

document
li Piani, T. (author), Weerheijm, J. (author), Peroni, M. (author), Koene, L. (author), Krabbenborg, D. (author), Solomos, G. (author), Sluys, L.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...
article 2020
document
Lubbers, L.A. (author), Philippens, M.M.G.M. (author), Weerheijm, J. (author)
Mechanical metamaterials – man-made materials which derive their unusual properties from their structure rather than their composition (Bertoldi, 2017) – are able to prohibit the propagation of mechanical waves in a pre-defined frequency band, the so-called band gap (Hussein, 2014, Krushynska, 2017). Here we show how metamaterials that exhibit a...
public lecture 2020
document
Simons, E.C. (author), Weerheijm, J. (author), Toussaint, G. (author), Sluys, L.J. (author)
In this study, the impact of a steel spherical projectile on an alumina ceramic is considered. New experimental and numerical results are presented and analysed. Numerical results are obtained using the Finite Element Method and the upgraded viscosity regularized Johnson-Holmquist-2 constitutive model to describe the ceramic material behaviour....
article 2020
document
Ozbek, A.S. (author), Pedersen, R.R. (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 mixtures...
article 2019
document
Simons, E.C. (author), Weerheijm, J. (author), Sluys, L.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....
article 2019
document
Li Piani, T. (author), Weerheijm, J. (author), Koene, L. (author), Sluys, L.J. (author)
A local damage model is proposed for the numerical assessment of the static performance of Adobe masonry components. The model was applied to simulate the experimental behaviour of sundried soil bricks and mud mortar tested in uniaxial compression and bending. Numerical simulations of the model are made mesh objective by means of a rate...
article 2019
document
li Piani, T. (author), Weerheijm, J. (author), Sluys, L.J. (author)
article 2019
document
Pereira, L.F. (author), Weerheijm, J. (author), Sluys, L.J. (author)
Although many aspects of the fracturing process of concrete are now well understood and successfully simulated with various models, it is still very difficult to properly simulate the different failure mechanisms observed in a concrete structure induced by ballistic impact. In this paper, an enhanced version of the effective-rate-dependent...
article 2018
document
Verolme, E.K. (author), van der Voort, M.M. (author), Smits, R. (author), Weerheijm, J. (author), Koh, Y.H. (author), Kang, K.W. (author)
There is limited knowledge on deriving the strength of an explosion based on the observed explosion effects. Existing methods are based primarily on the effects of blast overpressure on surrounding structures. Window breakage and structural damage are well studied and are widely used to derive most probable explosion strengths. Other explosive...
article 2018
document
Roebroeks, G.H.J.J. (author), Hoogland, J. (author), Weerheijm, J. (author), van Daelen, E.C.M. (author), van de Kasteele, R.M. (author), Ierschot, P.G.A. (author)
Over the last three years TNO has explored the possibilities of fiber-reinforced composites to provide vehicle underbelly protection against blast loading. This work consists of three parts: • Numerical analysis of full-scale blast loading conditions in comparison to scaled blast loading conditions. • The development of a test method suitable to...
conference paper 2018
document
Roebroeks, G.H.J.J. (author), Hoogland, J. (author), Weerheijm, J. (author), van Daelen, E.C.M. (author), van de Kasteele, R.M. (author), Ierschot, P.G.A. (author)
This paper shows how standard fiber-reinforced composite materials have limited resistance against blast loading. Their relatively high brittleness in comparison to metals causes them to fail early under out-of-plane blast loading. Their failure appears to be mainly caused by exceedance of strain to failure by local bending, fully absorbing the...
conference paper 2018
document
Li Piani, T. (author), Krabbenborg, D. (author), Weerheijm, J. (author), Koene, L. (author), Sluijs, L.J. (author)
Adobe is an ancient building technology made of sun dried bricks joined together by mud mortar. This paper deals with the physical and mechanical characterization of three different typologies of adobe bricks and one typology of mud mortar produced in Europe. They differed in terms of internal soil element proportions and amount of organic...
article 2018
document
Carton, E.P. (author), Roebroeks, G.H.J.J. (author), Weerheijm, J. (author), Diederen, A.M. (author)
Research on armor ceramics created only limited success in its search for relations between mechanical properties and the ballistic efficiency of this class of materials. Also TNO performed research on this subject using a range of experimental test set-ups (mainly using small and mid-caliber rounds) and diagnostic tools on a range of ceramic...
conference paper 2018
document
Weerheijm, J. (author), Grunwald, C. (author), Slobbe, A.T. (author), von Ramin, M. (author)
The Klotz Group (KG), an international group of experts on explosion safety, investigates the debris throw hazard associated with the accidental detonation of ammunition in reinforced concrete (RC) structures. Experiments are combined with engineering models but also with results of advanced computational modeling, which is the topic of this...
conference paper 2017
document
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 impact 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 ...
article 2016
document
Verreault, J. (author), Leerdam, P.J.C. (author), Weerheijm, J. (author)
The calibration of a user-defined blast model implemented in LS-DYNA is presented using full-scale test rig experiments, partly according to the NATO STANAG 4569 AEP-55 Volume 2 specifications where the charge weight varies between 6 kg and 10 kg and the burial depth is 100 mm and deeper. The model calibration is performed on the specific...
conference paper 2016
document
Fan, J.T. (author), Weerheijm, J. (author), Sluys, L.J. (author)
A glass-polymer system of a polyurethane elastomeric matrix with a single 3 mm-diameter glass particle was investigated using a split Hopkinson pressure bar (SHPB) setup for revealing the dynamic compressive mechanical response. This study produced the characteristics of the dynamic stress-strain relation and the relations for the rate...
article 2016
document
Fan, J.T. (author), Weerheijm, J. (author), Sluys, L.J. (author)
Multiple-particles-polymer systems of a polyurethane elastomeric matrix embedding 25wt.% and 50wt.% 0.5 mm-diameter PMMA particles were investigated using a split Hopkinson pressure bar (SHPB) setup for revealing the dynamic compressive mechanical response. Taking the 25wt.%-particles-polymer system as a reference case, the characteristics of...
article 2016
document
Verreault, J. (author), Roebroeks, G.H.J.J. (author), Weerheijm, J. (author)
The development of new bottom concepts for military vehicles against mine blast threats involves the consideration of two main aspects: the bottom geometry and the material used. In order to reduce costs, experimental testing of new vehicle bottom concepts often requires small-scale setups together with numerical simulations to assist the design...
conference paper 2016
document
Simons, E.C. (author), Weerheijm, J. (author), Sluys, L.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
Searched for: author:"Weerheijm, J."
(1 - 20 of 87)

Pages