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Harandi, Ali Nazemi (author), Eslami, Abdoulmajid (author), Bahrami, Abbas (author), Bakhtafrouz, Asghar (author), Yazdan Mehr, M. (author)
This study presents a failure analysis in two reformer tubes used for hydrogen production in a petrochemical industry. These tubes (Tube A and Tube B) were made by the centrifugal casting of HP-Nb alloy in such a way that one contained titanium as a micro-element, and the other was free from titanium in its chemical composition. Although the two...
journal article 2023
document
Du, L. (author), Zhao, Xiujuan (author), Poelma, René H. (author), van Driel, W.D. (author), Zhang, Kouchi (author)
SnBiAgCu solder alloy is an attractive soldering material for temperature-sensitive electronic devices due to its excellent creep properties. This study firstly reports the creep properties of SnBiAgCu solder alloy under different temperatures. Results show that the addition of Bi resulted in better creep resistance compared with that of...
conference paper 2023
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Sun, Yufeng (author), Pardoen, Benoît (author), van den Eijnden, A.P. (author), Wong, Henry (author)
Clay rocks are multiphase porous media having a complex structure and behaviour characterised by heterogeneity, damage and viscosity, existing on a wide range of scales. The mesoscopic scale of mineral inclusions embedded in a clay matrix has an important role in the mechanisms of deformation under mechanical loading by cracking and creeping....
journal article 2023
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Du, L. (author), Zhao, Xiujuan (author), Watte, Piet (author), Poelma, René H. (author), van Driel, W.D. (author), Zhang, Kouchi (author)
The objective of this article is to investigate the thermal-fatigue properties of a commercially available lead-free solder alloy (SnBiAgCu) under the use of different types of potting compounds. Solder alloys with lower silver content are expected to substitute the conventional solder alloys SAC305 (Sn-3.0Ag-0.5Cu). First, the tensile...
conference paper 2022
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Lu, T. (author)
Concrete is a brittle composite material that easily fractures under tension. Due to the fact that the early-age deformation of the concrete member is restrained by adjoining structures, cracking can occur throughout the concrete prior to application of any load. The cracks would provide preferential access for aggressive agents penetrating in...
doctoral thesis 2019
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Yasin, Saima (author), Shakeel, A. (author), Iqbal, Tanveer (author), Ahmad, Fazeel (author), Mehmood, Hamayoun (author), Luckham, Paul F. (author), Ullah, Nehar (author)
Nano-indentation is an interesting tool for analyzing nano-scale mechanical properties. The analysis of nano-mechanical properties as a function of experimental conditions is very critical for designing engineering components. In this study, nano-indentation experiments were performed by considering different values of amplitude (1, 5, 10 nm...
journal article 2019
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Bahrami, Abbas (author), Taheri, P. (author)
This paper investigates a failure in HP-Mod radiant tubes in a petrochemical plant. Tubes fail after 90,000 h of working at 950 °C. Observed failure is in the form of excessive bulging and longitudinal cracking in reformer tubes. Cracks are also largely branched. The microstructure of service-exposed tubes was evaluated using optical and...
journal article 2019
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Versteylen, C.D. (author), Szymański, N. K. (author), Sluiter, M.H.F. (author), van Dijk, N.H. (author)
In recently discovered self healing creep steels, open-volume creep cavities are filled by the precipitation of supersaturated solute. These creep cavities form on the grain boundaries oriented perpendicular to the applied stress. The presence of a free surface triggers a flux of solute from the matrix, over the grain boundaries towards the...
journal article 2018
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Lazari, Maria (author), Sanavia, Lorenzo (author), di Prisco, Claudio (author), Pisano, F. (author)
This paper reappraises Perzyna-type viscoplasticity for the constitutive modelling of granular geomaterials, with emphasis on the simulation of rate/time effects of different magnitude. An existing elasto-plastic model for sands is first recast into a Perzyna viscoplastic formulation and then calibrated/validated against laboratory test...
journal article 2018
document
van de Ven, O.S. (author)
Sensor positioning is critical for achieving a measurement accuracy in the picometre range with capacitive displacement sensors. This thesis discusses the contradictory requirements that the sensor alignment application imposes: motion capability combined with extreme displacement stability. In addition, it explores three micrometre scale...
doctoral thesis 2016
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Ohlund, C.E.I.C. (author), Lukovic, M. (author), Weidow, J (author), Thuvander, M (author), Offerman, S.E. (author)
A comparison is made between the mechanical properties of the ultra-high-strength steel KNDS4 of fastener grade 14.9 and of conventional, high-strength steels 34Cr4 of fastener grade 12.9 and 33B2 of grade 10.9. The results show that the ratio of the yield strength at elevated temperatures to the yield strength at room temperature is higher for...
journal article 2016
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Leemann, A. (author), Hammer, A. (author), Grunewald, S. (author), Ferrara, L. (author), Dehn, F. (author)
Stress and strain interaction is of vital importance for concrete structures as it has an influence on cracking, deflection and prestressing loss. With the increased range of compressive strengths and flow characteristics, the mixture composition of nowadays concretes often differs considerably from Vibrated Concrete (VC) with regard to paste...
conference paper 2015
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Zhang, S. (author)
Steel components can exhibit premature and low-ductility creep fracture, when exposed to high temperatures for long times. The failure arises from the formation, growth and coalescence of ultra-fine cracks and cavities. Self healing of damage is a promising new approach to enhance the lifetime of the steel components, in particular for...
doctoral thesis 2015
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Langelaan, G. (author), Zhang, S. (author), Brück, E. (author), Van der Zwaag, S. (author), Van Dijk, N.H. (author)
Abstract only.
conference paper 2013
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Shabir, Z. (author)
A deeper understanding of the deformation and failure mechanisms in polycrystals is of utmost importance for their reliable use as engineering materials. These mechanisms are strongly influenced by the geometry of the granular arrangement. In this work, two-dimensional intergranular quasi-static crack propagation in brittle polycrystals and...
doctoral thesis 2012
document
Delfgaauw, S. (author), Buykx, S.M. (author), Bosch, J.W. (author)
The new North/South metro line in Amsterdam contains several stations, some of which with an excavation depth of 30 m below surface. The design of these station boxes is very much determined by the adjacent historic buildings, high water table and the relatively soft soil. A lot of effort is put into minimising the settlements of buildings with...
conference paper 2009
document
Molenaar, J.M.M. (author)
The investigation was undertaken to support innovations in the field of asphalt pavement design and material selection, and to be able to evaluate or judge the risk of failure and cost-effectiveness of newly developed paving materials in order to justify their application. To be able to determine the risk of failure and cost-effectiveness,...
doctoral thesis 2004
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Hölscher, P. (author)
report 2003
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den Haan, E.J. (author)
report 2001
document
Van Zijl, G.P.A.G. (author), De Borst, R. (author), Rots, J.G. (author)
The response of cementitious materials is highly time dependent. On the one hand, it can lead to delayed collapse of structures fabricated of such materials. On the other hand, the time dependence is associated with the relaxation of peak stresses, which avoids, or postpones damage. A finite element formulation is presented for the analysis of...
journal article 2000
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