Searched for: subject:"Mechatronics%2C%5C+Mechanics%5C+%26%5C+Materials"
(1 - 20 of 910)

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Xu, Y. (author), Menon, A.S. (author), Harks, P.P.R.M.L. (author), Hermes, D.C. (author), Haverkate, L.A. (author), Unnikrishnan, S. (author), Mulder, F.M. (author)
Li and Na metals have the highest theoretical anode capacity for Li/Na batteries, but the operational safety hazards stemming from uncontrolled growth of Li/Na dendrites and unstable electrode-electrolyte interfaces hinder their real-world applications. Recently, the emergence of 3D conductive scaffolds aimed at mitigating the dendritic growth...
article 2018
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Dijkers, H.P.A. (author), Hooijmeijer, P.A. (author)
Ammunition transshipments are a key part of the logistical operations of the armed forces and are often executed via ships. These transshipments pose a risk to the people present in the area surrounding the harbor, where the loading/unloading of the ship takes place. A method is presented to perform a quantitative risk assessment of such...
conference paper 2018
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Sadeghian Marnani, H. (author), Herfst, R.W. (author), Dekker, A. (author), Winters, J. (author), Bijnagte, A.A. (author), Rijnbeek, R.A. (author)
Atomic force microscopy (AFM) is an essential nanoinstrument technique for several applications such as cell biology and nanoelectronics metrology and inspection. The need for statistically significant sample sizes means that data collection can be an extremely lengthy process in AFM. The use of a single AFM instrument is known for its very low...
article 2017
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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
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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
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Westerhof, T.A.T. (author), Huebner, M. (author), Ferretti, D.L. (author), van Doormaal, J.C.A.M. (author), Gebbeken, N. (author)
Determination of the structural response of a structural element under blast loading is of interest to vulnerability / lethality (V/L) studies of military operations in urban terrain. These studies require a quick and easy to use method to simulate the structural response of e.g. a wall under non-uniform loading conditions. The single degree of...
conference paper 2016
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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
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Sadeghian Marnani, H. (author), Dekker, A. (author), Herfst, R.W. (author), Winters, J. (author), Eigenraam, A.B.C. (author), Rijnbeek, R.A. (author), Nulkes, N. (author)
With the device dimensions moving towards the 1X node and below, the semiconductor industry is rapidly approaching the point where existing metrology, inspection and review tools face huge challenges in terms of resolution, the ability to resolve 3D and the throughput. Due to the advantages of sub-nanometer resolution and the ability of true 3D...
conference paper 2015
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Weerheijm, J. (author), Roebroeks, G. (author), Krabbenborg, D. (author), Agar Ozbek, A.S. (author)
A special porous concrete has been developed by the Delft University in collaboration with TNO. The concrete has a static compressive strength of 45 MPa. It fragments at impact into small size debris relative to reference concrete. The porous concrete was developed at laboratory scale and tested at small scale. In collaboration with the Military...
conference paper 2015
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Sadeghian Marnani, H. (author), van den Dool, T.C. (author), Uziel, Y. (author), Bar Or, R. (author)
This paper aims at unraveling the mystery of damage in high speed AFMs for 1X node and below. With the device dimensions moving towards the 1X node and below, the semiconductor industry is rapidly approaching the point where existing metrology, inspection and review tools face huge challenges in terms of resolution, the ability to resolve 3D,...
conference paper 2015
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Keyvani Janbahan, A. (author), Sadeghian Marnani, H. (author), Goosen, H. (author), van Keulen, F. (author)
The maximum amount of repulsive force applied to the surface plays a very important role in damage of tip or sample in Atomic Force Microscopy(AFM). So far, many investigations have focused on peak repulsive forces in tapping mode AFM in steady state conditions. However, it is known that AFM could be more damaging in transient conditions. In...
conference paper 2015
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Vegt, I. (author), Weerheijm, J. (author)
The mechanical response of concrete is represented in the load-deformation curve which shows the response up to maximum strength as well as the post-peak response up to complete failure. Dynamic tests exhibit an extensive rate effect on the tensile strength beyond loading rates of about 50 GPa/s (strain rates > 1/s). Whether the apparent...
conference paper 2015
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Herfst, R.W. (author), Dekker, A. (author), Witvoet, G. (author), Crowcombe, W.E. (author), de Lange, T.J. (author), Sadeghian Marnani, H. (author)
One of the major limitations in the speed of the atomic force microscope (AFM) is the bandwidth of the mechanical scanning stage, especially in the vertical (z) direction. According to the design principles of “light and stiff” and “static determinacy,” the bandwidth of the mechanical scanner is limited by the first eigenfrequency of the AFM...
article 2015
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Tyler-Street, M. (author), Leerdam, P.J. (author), Verhoeven, T. (author)
Anti-vehicle (AV) mines and Improvised Explosive Devices (IEDs) pose a major threat in recent and current missions. In the latest operational theatres of Iraq and Afghanistan they have been responsible for a significant proportion of all casualties. Understanding both the characteristics and strength of the blast loading from these devices is...
conference paper 2014
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Boonacker, B. (author), van Doormaal, J.C.A.M. (author), Weerheijm, J. (author)
Safety evaluation, risk assessment and decisions on prevention and protection measures require simple fast running methods. It is a challenge to develop a consequence analysis method that is relatively simple, but still has the ability to discern between different cases, scenarios and buildings. In the past years, TNO has participated in the FP7...
conference paper 2014
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Khoe, Y.S. (author), van der Horst, M.J. (author), van der Weiden, M.C. (author)
The introduction, analysis or development of soldier systems presents many questions regarding the optimum of possible combinations of burden, effectiveness and safety of the soldier system. The soldier is subject to a broad spectrum of physical loads as a consequence of the threats being encountered. Often, the individual burdens are treated...
conference paper 2014
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Agar Ozbek, A.S. (author), Weerheijm, J. (author)
Porous concrete is a special type of cementitious material incorporating a high amount of meso-size air pores that makes its characteristics markedly different from normal concrete. Therefore, it is being investigated for various applications, aiming to benefit from the presence of the air voids in its structure, such as permeability, noise...
conference paper 2014
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Roozeboom, F. (author), De Gendt, S. (author), Delabie, A. (author), Elam, J.W. (author), Londergan, A. (author), van der Straten, O. (author)
conference paper 2014
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Carton, E.P. (author), Roebroeks, G.H.J.J. (author), Broos, J.P.F. (author), Halls, V. (author), Zheng, J. (author)
In order use material models in (numerical) calculations, the mechanical properties of all materials involved should be known. At TNO an indirect method to determine the dynamic flow stress of materials has been generated by a combination of ballistic penetration tests with an energy-based engineering model. For visco-elasto-plastic materials,...
conference paper 2014
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Roebroeks, G.H.J.J. (author), Carton, E.P. (author)
TNO has developed an engineering model for flexible body armor, as one of their energy based engineering models that describe the physics of projectile to target interactions (weaves, metals, ceramics). These models form the basis for exploring the possibilities for protection improvement. This presentation describes how the main physical...
conference paper 2014
Searched for: subject:"Mechatronics%2C%5C+Mechanics%5C+%26%5C+Materials"
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