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Heidari, H. (author)Considerable work has been done on the modelling of fracture and necking for accidents in the maritime and offshore industry, but very little has been done to find the crack orientation during this failure. Such information will be required in future analyses which use the eXtended Finite Element Method (XFEM), rather than the element deletion...conference paper 2020
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Atli-Veltin, B. (author)The main objective of the experimental study detailed in this paper is to investigate the performance of fully recyclable, lightweight, low-cost, thermoplastic Polypropylene (PP) composite tapes at low temperatures. Coupons made of [±45] and [0/90] laminates are subjected to tensile and 3-point bending tests at room temperature as well as at ...article 2018
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Haffinger, P. (author), Jedari Eyvazi, F. (author), Steeghs, P. (author), Doulgeris, P. (author), Gisolf, D. (author), Verschuur, E. (author)In the context of carbon capture and storage (CCS), quantitative estimation of injected CO2 is of vital importance to verify if the process occurs without any leakage. From a geophysical perspective this is challenging as a CO2 plume has a severe imprint on seismic data. While this makes delineation of the plume rather straightforward, for...conference paper 2018
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Dragt, R.C. (author), Maljaars, J. (author), Tuitman, J.T. (author), Salman, Y. (author), Otheguy, M.E. (author)Retardation is a load sequence effect, which causes a reduced fatigue crack growth rate after an overload is encountered. Retardation can be cancelled when the overload is followed by an underload. The net effect is beneficial to the fatigue lifetime of Offshore Wind Turbines (OWTs). To be able to take this into account, computationally...conference paper 2016
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Silitonga, S. (author), Maljaars, J. (author), Soetens, F. (author), Snijder, H.H. (author)In this work, a numerical method is pursued based on a cohesive zone model (CZM). The method is aimed at simulating fatigue crack growth as well as crack growth retardation due to an overload. In this cohesive zone model, the degradation of the material strength is represented by a variation of the cohesive traction with respect to separation of...article 2014
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Silitonga, S. (author), Maljaars, J. (author), Soetens, F. (author), Snijder, H.H. (author)Predicting the remaining fatigue life of a structure with crack(s) is generally conducted by the fracture mechanics method. This method is aimed at predicting the crack growth and final fracture due to fluctuating loads. The crack growth curve required for these calculations is constructed on the basis of experiments. However, obtaining these...conference paper 2012
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Paes, S.S. (author), Yakimets, I. (author), Wellner, N. (author), Hill, S.E. (author), Wilson, R.H. (author), Mitchell, J.R. (author)The aim of this study was to provide a detailed description of the fracture mechanisms in three different biopolymer thin materials: gelatin, hydroxypropyl cellulose (HPC) and cassava starch films. That was achieved by using a combination of fracture mechanics methodology and in situ visualization with high speed imaging technique. By analyzing...article 2010
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Ettorre, M. (author), Bruni, S. (author), Gerini, G. (author), Neto, A. (author), Llombart, N. (author), Maci, S. (author), TNO Defensie en Veiligheid (author)This work proposes a new topology of antenna based on the use of Planar Circular Symmetric EBG with different periodicities. These periodicities are used to impose different propagation velocities of the dominant surface waves on different zones of the same dielectric substrate. The control of the dispersion characteristics guides the design...conference paper 2007
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Bruni, S. (author), Neto, A. (author), Gerini, G. (author), Bekers, D.J. (author), TNO Defensie en Veiligheid (author)This paper proposes a novel imaging architecture suited for use in the mm and the submm wave regimes. The structure is composed by a one dimensional array of radiators in order to enhance the image acquisition time with respect to single element detection. Moreover each of the antenna elements composing the array is characterized by a relatively...conference paper 2007
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TNO Industrie en Techniek (author), Zhang, X. (author), van den Bos, C. (author), Sloof, W.G. (author), Hovestad, A. (author), Terryn, H. (author), de Wit, J.H.W. (author)Drying effects on corrosion performance of Cr(VI)- and Cr(III)-treated electro-galvanized steel have been studied in NaCl solution using potentiodynamic measurements and electrochemical impedance spectroscopy (EIS), The Cr(VI) and the Cr(III) treated specimens were dried at three different temperatures: 60, 110 and 210°C. The surface layers were...conference paper 2006
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Zhu, Q. (author), de With, G. (author), Dortmans, L.J.M.G. (author), Feenstra, F. (author)The purpose of this study is to investigate the subcritical crack growth (SCG) behavior of alumina-glass dental composites. Alumina-glass composites were fabricated by infiltrating molten glass to porous alumina preforms. Rectangular bars of the composite were subject to dynamic loading in air, with stressing rates ranging from 0.01 MPa/s to 2...article 2003
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TNO Industrie en Techniek (author), Donners, M.A.H. (author), Dortmans, L.J.M.G. (author), de With, G. (author)The variation of the fracture toughness of MnZn ferrite ceramics with varying loading rate and humidity was determined with the aid of the single edge notched beam (SENB) test. A strong decrease with increasing humidity and decreasing loading rate was observed. A model for subcritical crack growth incorporating kinetic and adsorption effects was...article 2000
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Carton, E.P. (author), Stuivinga, M.E.C. (author), Keizers, H.L.J. (author), Verbeek, H.J. (author), van der Put, P.J. (author), Prins Maurits Laboratorium TNO (author)Shock compaction was used in the fabrication of high temperature ceramic-based materials. The materials' development was geared towards the fabrication of nozzles for rocket engines using solid propellants, for which the following metal-ceramic (cermet) materials were fabricated and tested: B4C-Ti (15 vol.-%). B4C-Al, and TiB2-Al, with an Al...article 1999
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Pijnenburg, K.G.W. (author), Steenbrink, A.C. (author), Giessen, E.V.D. (author), TNO Wegtransportmiddelen (author)Microstructural investigations below the fracture surface have revealed that the rubber particles in a number of polymer-rubber blends were deformed into remarkable S-like shapes. These shapes seem to have been largely ignored in previous microstructural studies of blends, but in fact cannot be explained from the known deformation states around...article 1999
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Carvalho, N.J.M. (author), Huis in 't Veld, A.J. (author), de Hosson, J.T. (author), TNO Industrie (author)Titanium-nitrogen (TiN) films were Physical Vapour Deposited (PVD) on tool steel substrates with different hardness and surface roughness, in a Bai 640R unit using a triode ion plating (e-gun) with a high plasma density. The coated substrates were submitted to a rolling contact fatigue test technique (modified pin-on-ring test) to obtain some...article 1998
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Breen, J. (author), Kunstoffen en Rubber Instituut TNO (author)The fracture toughness of Polyvinylchloride (PVC) and PVC modified with 10% chlorinated polyethylene (PVC-CPE) was studied in vapour and in liquid environments by crack growth measurements on single-edge notch specimens under three-point bending at 23°C. In addition, some results obtained in air at lower temperatures are presented. The fracture...article 1995
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Breen, J. (author), Kunstoffen en Rubber Instituut TNO (author)The failure of unnotched PVC and PVC-CPE was studied in a number of vapour and liquid environments. The failure mechanisms observed are related to craze initiation and logarithmic craze growth. A model to explain the origin of the logarithmic craze growth is presented. The failure mechanism in air and in benzene and toluene vapours is ductile,...article 1994
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Breen, J. (author), Kunstoffen en Rubber Instituut TNO (author)The craze initiation of PVC and PVC-CPE in a number of vapour and liquid environments was studied. The observed decrease in the craze-initiation stress could be ascribed to the absorption of components by the PVC and the PVC-CPE matrix. The magnitude of the absorption depends on the activity of the components and on their interaction with the...article 1993
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van Straalen, IJ.J. (author), Dijkstra, O.D. (author)The paper deals with the fracture mechanics approach to the fatigue life and crack growth of welded connections in steel and aluminium structures. This approach can be used as a design as well as a maintenance tool. The following aspects of fatigue calculations are highlighted: modelling of the geometry and stresses, crack schematisation and a...article 1993