Searched for: author:"van der Zwaag, S."
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Rubio Carpio, A. (author), Avallone, F. (author), Ragni, D. (author), Snellen, M. (author), van der Zwaag, S. (author)
An experimental study on broadband noise scattered by permeable trailing edges with different pore arrangements is performed. A NACA 0018 airfoil with chord c = 0.2 m is investigated at chord-based Reynolds numbers ranging from 1.4 × 10<sup>5</sup> to 3.8 × 10<sup>5</sup> and angles of attack of 0.2 and 5.4 degrees. Noise emission from five...
journal article 2020
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Montano, V. (author), Senardi, M. (author), van der Zwaag, S. (author), Garcia, Santiago J. (author)
The use of rheology and terminal flow relaxation times to predict healing behavior at long healing times is by now quite well accepted. In this work we go one step further and explore the use of macro-rheology (in particular the stored work of deformation) to predict the early stage interfacial healing properties (fracture resistance) of a...
journal article 2020
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Fu, Y. (author), Kwakernaak, C. (author), Sloof, W.G. (author), Tichelaar, F.D. (author), Brück, E.H. (author), van der Zwaag, S. (author), van Dijk, N.H. (author)
Autonomous healing of creep-induced grain boundary cavities by Au-rich and W-rich precipitates was studied in a Fe-3Au-4W (wt pct) alloy at a fixed temperature of 823 K (550 °C) with different applied stresses. The ternary alloy, with two supersaturated healing solutes, serves as a model system to study the interplay between two separate...
journal article 2020
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Nutter, J. (author), Rainforth, W. M. (author), van der Zwaag, S. (author)
The current study reports the detailed analysis of an observation of the local pinning of a slowly moving austenite-ferrite interface by a single nanosized oxidic particle. The observations were made during an in situ cyclic partial phase transformation experiment on a Fe-0.1C-1.0Mn alloy close to the inversion stage at which the interface...
journal article 2020
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Yu, H. (author), Xu, W. (author), van der Zwaag, S. (author)
In this work, we combine a generic alloy-by-design model with a novel concept, the nucleation barrier for the formation of Laves phase to fill the creep cavities, in order to develop multi-component creep resistant steels with kinetically tuned self-healing behaviour. In the model the high-temperature long-term strength is estimated by...
journal article 2020
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Zhang, Shasha (author), Cizek, Jakub (author), Yao, Zhengjun (author), Oleksandr, Moliar (author), Kong, Xiangshan (author), Liu, Changsong (author), van Dijk, N.H. (author), van der Zwaag, S. (author)
Self healing of early stage radiation damage by site selective solute segregation is a promising approach to extend the lifetime of nuclear reactor components. In the present study, the creation and autonomous healing of irradiation-induced damage is investigated in pure Fe and high purity Fe–Au and Fe–Cu model alloys. To create radiation...
journal article 2020
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Ding, Ran (author), Liu, Geng (author), Wan, Xinhao (author), Ponge, Dirk (author), Raabe, Dierk (author), Godfrey, Andy (author), Furuhara, Tadashi (author), Yang, Zhigang (author), van der Zwaag, S. (author)
For decades, grain boundary engineering has proven to be one of the most effective approaches for tailoring the mechanical properties of metallic materials, although there are limits to the fineness and types of microstructures achievable, due to the rapid increase in grain size once being exposed to thermal loads (low thermal stability of...
journal article 2020
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Osada, Toshio (author), Watabe, Aiko (author), Yamamoto, Joji (author), Brouwer, J.C. (author), Kwakernaak, C. (author), Ozaki, Shingo (author), van der Zwaag, S. (author), Sloof, W.G. (author)
Bones of humans and animals combine two unique features, namely: they are brittle yet have a very high fracture toughness linked to the tortuosity of the crack path and they have the ability to repeatedly heal local fissures such that full recovery of overall mechanical properties is obtained even if the local bone structure is irreversibly...
journal article 2020
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Deutz, D.B. (author), van der Zwaag, S. (author), Groen, P.C. (author)
As demand rises for flexible electronics, traditionally prepared sintered ceramic sensors must be transformed into fully new sensor materials that can bend and flex in use and integration. Negative temperature coefficient of resistance (NTC) ceramic thermistors are preferred temperature sensors for their high accuracy and excellent stability,...
journal article 2020
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Zhang, Shasha (author), van Dijk, N.H. (author), van der Zwaag, S. (author)
Self-healing metals possess the capability to autonomously repair structural damage during service. While self-healing concepts remain challenging to be realized in metals and metallic systems due to the small atomic volume of the mobile atoms, the slow diffusion unless at high temperatures and the strong isotropic metallic bonds, the...
review 2020
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Rubio Carpio, A. (author), Avallone, F. (author), Ragni, D. (author), Snellen, M. (author), van der Zwaag, S. (author)
The turbulent flow over a porous trailing edge of a NACA 0018 airfoil is experimentally investigated to study the link between the hydrodynamic flow field and the acoustic scattering. Four porous trailing edges, obtained from open-cell metal foams, are tested to analyze the effects on far-field noise of the permeability of the material and of...
journal article 2019
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Farahani, H. (author), Xu, W. (author), van der Zwaag, S. (author)
Controlling the kinetics of austenite decomposition by controlled partitioning of alloying elements, in particular carbon and manganese, is the key factor for optimizing the microstructures of advanced high-strength steels. In this study, a systematic set of computational and experimental cyclic partial phase transformations in low to medium...
journal article 2019
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Fang, H. (author), Szymanski, N. (author), Versteylen, C. D. (author), Cloetens, P. (author), Kwakernaak, C. (author), Sloof, W.G. (author), Tichelaar, F.D. (author), Balachandran, S. (author), Herbig, M. (author), Brück, E.H. (author), van der Zwaag, S. (author), van Dijk, N.H. (author)
When metals are mechanically loaded at elevated temperatures for extended periods of time, creep damage will occur in the form of cavities at grain boundaries. In the present experiments it is demonstrated that in binary iron-tungsten alloys creep damage can be self healed by selective precipitation of a W-rich phase inside these cavities. Using...
journal article 2019
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Stuber, V.L. (author), Mahon, T.R. (author), van der Zwaag, S. (author), Groen, W.A. (author)
Polymer-piezoceramic composites have drawn a lot of attention for sensor and energy harvesting applications. Poling such materials can be difficult due to the electric field getting mostly distributed over the low dielectric constant matrix. During this process, the electrical matrix conductivity plays a vital role. This work shows how two...
journal article 2019
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Stuber, V.L. (author), Deutz, Daniella B. (author), Bennett, James (author), Cannel, David (author), de Leeuw, D.M. (author), van der Zwaag, S. (author), Groen, W.A. (author)
Vibrational piezoelectric energy harvesters are being investigated to replace batteries in embedded sensor systems. The energy density that can be harvested depends on the figure of merit, d<sub>33</sub>g<sub>33</sub>, where d<sub>33</sub> and g<sub>33</sub> are the piezoelectric charge and voltage coefficient. Commonly used piezoelectric...
journal article 2019
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Rubio Carpio, A. (author), Merino Martinez, R. (author), Avallone, F. (author), Ragni, D. (author), Snellen, M. (author), van der Zwaag, S. (author)
The hydrodynamic and acoustic fields for a NACA 0018 with solid and porous trailing edge inserts are investigated. The porous inserts, covering 20% of the chord, are manufactured with metal foams with cell diameters of 450 and 800 μm and permeability values of 6 × 10−10 and 2.7 × 10−9 m2. The experiments are performed at a chord-based Reynolds...
journal article 2019
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Hedayati, R. (author), Rubio Carpio, A. (author), Luesutthiviboon, S. (author), Ragni, D. (author), Avallone, F. (author), Casalino, D. (author), van der Zwaag, S. (author)
Studies on porous trailing edges, manufactured with open-cell Ni-Cr-Al foams with sub-millimeter pore sizes, have shown encouraging results for the mitigation of turbulent boundary-layer trailing-edge noise. However, the achieved noise mitigation is typically dependent upon the pore geometry, which is fixed after manufacturing. In this study,...
journal article 2019
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Krishnasamy, J. (author), Ponnusami, Sathiskumar A. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)
The effect of splat interfaces on the fracture behavior of air plasma-sprayed thermal barrier coatings (APS-TBC) is analyzed using finite element modeling involving cohesive elements. A multiscale approach is adopted in which the explicitly resolved top coat microstructural features are embedded in a larger domain. Within the computational...
journal article 2019
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Rubio Carpio, A. (author), Avallone, F. (author), Ragni, D. (author), Snellen, M. (author), van der Zwaag, S. (author)
Turbulent boundary layer trailing-edge noise scattered by a NACA0018 airfoil equipped with 3D printed perforated trailing-edge inserts, i.e. with straight cylindrical channels connecting the two sides of the airfoil, is investigated. The inserts have different permeability in order to assess the effect of this property on broadband noise...
conference paper 2019
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Veldhuizen, H.V. (author), Vasileiadis, A. (author), Wagemaker, M. (author), Mahon, T.R. (author), Mainali, D.P. (author), Zong, Lishuai (author), van der Zwaag, S. (author), Nagai, A. (author)
journal article 2019
Searched for: author:"van der Zwaag, S."
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