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Kumthekar, A. (author), Ponnusami, Sathiskumar A. (author), van der Zwaag, S. (author), Turteltaub, S.R. (author)Computationally-efficient surrogate models based on a Polynomial Chaos Expansion (PCE) are developed to quantify the uncertainties in the fracture behavior and lifetime of a self-healing thermal barrier coating system (SH-TBC) and a benchmark conventional TBC system. The surrogate models are built using deterministic information from...journal article 2022
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Hussein, Abdelrahman (author), van der Zwaag, S. (author), Kim, Byungki (author)In recent years, a new class of super saturated binary and ternary alloys have demonstrated the ability for the self-healing of creep-induced voids formed at the grain boundaries. However, a clear understanding of the parameters affecting the self-healing mechanism is still not yet complete. One of the main challenges is understanding the...journal article 2024
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Montano, V. (author), Vogel, Wouter (author), Smits, Angela (author), van der Zwaag, S. (author), Garcia, Santiago J. (author)The effects of the soft block fraction and H-bond state in thermoplastic polyurethanes on autonomous entropy-driven scratch closure and barrier restoration are studied. To this aim, comparable polyurethanes with different segmentation states are applied as organic coatings on plain carbon steel plates, scratched under very well-controlled...journal article 2021
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Siroky, Georg (author), Kraker, Elke (author), Rosc, Jördis (author), Kieslinger, Dietmar (author), Brunner, Roland (author), van der Zwaag, S. (author), Kozeschnik, Ernst (author), Ecker, Werner (author)This work provides an analysis of X-ray micro computed tomography data of Sn-xBi solders with x = 20, 30, 35, 47, 58 wt.% Bi. The eutectic thickness, fraction of eutectic and primary phase are analyzed. Furthermore, the 3D data is evaluated by means of morphology parameters, such as, shape complexity, flatness, elongation and mean intercept...journal article 2021
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Krishnasamy, J. (author), Ponnusami, Sathiskumar A. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)The thermal cyclic behavior of self-healing thermal barrier coatings (SH-TBC) is analyzed numerically to develop a lifetime prediction model. Representative microstructures are studied adopting a unit cell based multiscale modeling approach along with a simplified evolution model for the thermally-grown oxide layer (TGO) to study the...journal article 2021
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Wu, Wentao (author), Chu, Liangyong (author), Garcia, Santiago J. (author), van der Zwaag, S. (author), Li, Ming (author), Shen, Liming (author), Bao, Ningzhong (author)In this paper, graphene oxide (GO) modified microcapsules have been developed for use in self-healing Cardanol-based epoxy anti-corrosion coatings on steel substrates. The microcapsules had a polymethyl methacrylate (PMMA) shell, covered with aminated GO flakes and contained either of the two complementary healing agents mixed with nanosized...journal article 2023
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Hernandez Santana, M. (author), Grande, A.M. (author), van der Zwaag, S. (author), Garcia, Santiago J. (author)Broadband dielectric spectroscopy (BDS) is introduced as a new and powerful technique to monitor network and macroscale damage healing in an elastomer. For the proof of concept, a partially cured sulfur-cured natural rubber (NR) containing reversible disulfides as the healing moiety was employed. The forms of damage healed and monitored were an...journal article 2016
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Susa, A. (author), Bose, R.K. (author), Grande, A.M. (author), van der Zwaag, S. (author), Garcia, Santiago J. (author)Traditional polyetherimides (PEIs) are commonly synthesized from an aromatic diamine and an aromatic dianhydride (e.g., 3,4′-oxidianiline (ODA) and 4,4′-oxidiphtalic anhydride (ODPA)) leading to the imide linkage and outstanding chemical, thermal and mechanical properties yet lacking any self-healing functionality. In this work, we have replaced...journal article 2016
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Farle, A.M. (author), Boatemaa, L. (author), Shen, L. (author), Gövert, S. (author), Kok, J.E. (author), Bosch, M (author), Yoshioka, S. (author), van der Zwaag, S. (author), Sloof, W.G. (author)Closure of surface cracks by self-healing of conventional and MAX phase ceramics under realistic turbulent combustion chamber conditions is presented. Three ceramics namely; Al<sub>2</sub>O<sub>3</sub>, Ti<sub>2</sub>AlC and Cr<sub>2</sub>AlC are investigated. Healing was achieved in Al<sub>2</sub>O<sub>3</sub> by even dispersion of TiC...journal article 2016
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Post, W. (author), Bose, R.K. (author), Garcia, Santiago J. (author), van der Zwaag, S. (author)This work reports on the healing of early stage fatigue damage in ionomer/nano-particulate composites. A series of poly(ethylene-co-methacrylic acid) zinc ionomer/Fe3O4 nanoparticle composites with varying amounts of ionic clusters were developed and subjected to different levels of fatigue loading. The initiated damage was healed upon localized...journal article 2016
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Bose, R.K. (author), Enke, Marcel (author), Grande, A.M. (author), Zechel, Stefan (author), Schacher, Felix H. (author), Hager, Martin D. (author), Garcia, Santiago J. (author), Schubert, Ulrich S. (author), van der Zwaag, S. (author)The main aim of this work is to study the respective contribution of the hard and soft blocks of a metal-ligand containing block copolymer to the self-healing behavior. To this aim, different block copolymers containing terpyridine were synthesized using reversible addition-fragmentation chain transfer (RAFT) polymerization. These block...journal article 2017
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Post, W. (author), Kersemans, M. (author), Solodov, I. (author), Van Den Abeele, K. (author), Garcia, Santiago J. (author), van der Zwaag, S. (author)A comparative study is performed on the monitoring of delamination healing in CFRP-ionomer sandwich composites by non-destructive techniques and destructive compression testing. Artificial delaminations of various areal dimensions and nature were introduced during production of the composites. The extent of the delamination and the healing...journal article 2017
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Fu, Y. (author), Fang, H. (author), Monaco, F. (author), Cloetens, P. (author), Tichelaar, F.D. (author), van Meel, J.G. (author), Brück, E.H. (author), van der Zwaag, S. (author), van Dijk, N.H. (author)Constant stress creep experiments at 550 °C were performed on a high-purity Fe-3Au-4W (wt.%) ternary alloy with about 1 at.% supersaturation for Au and W in order to study self healing of grain-boundary cavities by both Au-rich and W-rich precipitates. Using synchrotron X-ray nano-tomography, the development of the creep cavities and the...journal article 2022
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Grande, A.M. (author), Martin, R.P. (author), Odriozola, I (author), van der Zwaag, S. (author), Garcia, Santiago J. (author)The macroscopic interfacial healing behaviour in a series of urea-urethane networks as function of the hydrogen bonds and disulphides content is presented. The polymers were prepared with different crosslinking densities but with the same amount of dynamic covalent bonds (disulphide linkages). Tensile and fracture measurements were adopted to...journal article 2017
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Post, W. (author), Cohades, A. (author), Michaud, V (author), van der Zwaag, S. (author), Garcia, Santiago J. (author)We report the development of an intrinsic healing glass fibre reinforced polymer (GFRP) composite based on a disulphide-containing organic-inorganic thermoset matrix. Thermomechanical experiments showed that the newly developed matrix has a combination of a Young's modulus value in the range of (800–1200 MPa), the ability to multiple...journal article 2017
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Carabat, A.L. (author), Meijerink, M.J. (author), Brouwer, J.C. (author), Kelder, E.M. (author), van Ommen, J.R. (author), van der Zwaag, S. (author), Sloof, W.G. (author)A successful sol-gel process to encapsulate molybdenum di-silicide MoSi<sub>2</sub> particles with a closed and thermally stable Al<sub>2</sub>O<sub>3</sub> layer using aluminium tri-sec-butoxide as a precursor is presented. The processing conditions such as precursor selection and temperature were optimized through analysing the interaction...journal article 2018
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Farle, A.M. (author), Krishnasamy, J. (author), Turteltaub, S.R. (author), Kwakernaak, C. (author), van der Zwaag, S. (author), Sloof, W.G. (author)A wedge loaded testing methodology to determine the fracture energy and strength of (semi-) brittle (metallo-)ceramics is presented. The methodology combines a tailored specimen geometry and a comprehensive finite element analysis based on cohesive zone modelling. The use of a simulation-based approach to extract both fracture strength and...journal article 2018
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Boatemaa, L. (author), van der Zwaag, S. (author), Sloof, W.G. (author)This work explores the possibility of using embedded micron-sized Ti particles to heal surface cracks in alumina and to unravel the evolution of the crack filling process in case of pure solid-state oxidation reactions. The oxidation kinetics of the Ti particles is studied and the results are applied in a simple model for crack-gap filling....journal article 2018
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Ponnusami, Sathiskumar A. (author), Krishnasamy, J. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)A cohesive zone-based constitutive model, originally developed to model fracture, is extended to include a healing variable to simulate crack healing processes and thus recovery of mechanical properties. The proposed cohesive relation is a composite-type material model that accounts for the properties of both the original and the healing...journal article 2018
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van Dijk, N.H. (author), van der Zwaag, S. (author)In comparison to other materials, in metals and metallic systems self-healing of cracks and crack-initiating defects is difficult to achieve due to the fact the solute atoms that act as healing agents are relatively small and generally have a relatively low mobility at the prevailing operating temperatures. In this review, the scientifically...journal article 2018
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