Relevant bibliographies by topics / Mechanical Self-healing

Academic literature on the topic 'Mechanical Self-healing'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Mechanical Self-healing"

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Taylor, Danielle Lynne, and Marc in het Panhuis. "Self-Healing Hydrogels." Advanced Materials 28, no. 41 (August 4, 2016): 9060–93. http://dx.doi.org/10.1002/adma.201601613.

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Xiang, Siyuan, and Wendong Liu. "Self‐Healing Superhydrophobic Surfaces: Self‐Healing Superhydrophobic Surfaces: Healing Principles and Applications (Adv. Mater. Interfaces 12/2021)." Advanced Materials Interfaces 8, no. 12 (June 2021): 2170065. http://dx.doi.org/10.1002/admi.202170065.

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Odom, Susan A., Sarut Chayanupatkul, Benjamin J. Blaiszik, Ou Zhao, Aaron C. Jackson, Paul V. Braun, Nancy R. Sottos, Scott R. White, and Jeffrey S. Moore. "Self-Healing: A Self-healing Conductive Ink (Adv. Mater. 19/2012)." Advanced Materials 24, no. 19 (May 9, 2012): 2509. http://dx.doi.org/10.1002/adma.201290109.

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Cho, Soo Hyoun, Scott R. White, and Paul V. Braun. "Self-Healing Polymers: Self-Healing Polymer Coatings (Adv. Mater. 6/2009)." Advanced Materials 21, no. 6 (February 9, 2009): NA. http://dx.doi.org/10.1002/adma.200990020.

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Foteinidis, Georgios, Maria Kosarli, Pantelis Nikiphorides, Kyriaki Tsirka, and Alkiviadis S. Paipetis. "Capsule-Based Self-Healing and Self-Sensing Composites with Enhanced Mechanical and Electrical Restoration." Polymers 14, no. 23 (December 2, 2022): 5264. http://dx.doi.org/10.3390/polym14235264.

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In this work, we report for the first time the manufacturing and characterization of smart multifunctional, capsule-based self-healing and self-sensing composites. In detail, neat and nanomodified UF microcapsules were synthesized and incorporated into composites with a nanomodified epoxy matrix for the restoration of the mechanical and electrical properties. The electrical properties were evaluated with the use of the impedance spectroscopy method. The self-healing composites were subjected to mode-II fracture toughness tests. Additionally, the lap strap geometry that can simulate the mechanical behavior of a stiffened panel was used. The introduction of the nanomodified self-healing system improved the initial mechanical properties in the mode-II fracture toughness by +29%, while the values after the healing process exceeded the initial one. At lap strap geometry, the incorporation of the self-healing system did not affect the initial mechanical properties that were fully recovered after the healing process.
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An, Seongpil, Sam S. Yoon, and Min Wook Lee. "Self-Healing Structural Materials." Polymers 13, no. 14 (July 13, 2021): 2297. http://dx.doi.org/10.3390/polym13142297.

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Self-healing materials have been developed since the 1990s and are currently used in various applications. Their performance in extreme environments and their mechanical properties have become a topic of research interest. Herein, we discuss cutting-edge self-healing technologies for hard materials and their expected healing processes. The progress that has been made, including advances in and applications of novel self-healing fiber-reinforced plastic composites, concrete, and metal materials is summarized. This perspective focuses on research at the frontier of self-healing structural materials.
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Polydoropoulou, Panagiota, Christos Vasilios Katsiropoulos, Andreas Loukopoulos, and Spiros Pantelakis. "Mechanical behavior of aeronautical composites containing self-healing microcapsules." International Journal of Structural Integrity 9, no. 6 (December 3, 2018): 753–67. http://dx.doi.org/10.1108/ijsi-12-2017-0075.

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Purpose Over the last decades, self-healing materials based on polymers are attracting increasing interest due to their potential for detecting and “autonomically” healing damage. The use of embedded self-healing microcapsules represents one of the most popular self-healing concepts. Yet, extensive investigations are still needed to convince on the efficiency of the above concept. The paper aims to discuss these issues. Design/methodology/approach In the present work, the effect of embedded self-healing microcapsules on the ILSS behavior of carbon fiber reinforced composite materials has been studied. Moreover, the self-healing efficiency has been assessed. The results of the mechanical tests were discussed supported by scanning electron microscope (SEM) as well as by Attenuated Total Reflection–Fourier-transform infrared spectroscopy (ATR–FTIR) analyses. Findings The results indicate a general trend of a degraded mechanical behavior of the enhanced materials, as the microcapsules exhibit a non-uniform dispersion and form agglomerations which act as internal defects. A remarkable value of the self-healing efficiency has been found for materials with limited damage, e.g. matrix micro-cracks. However, for significant damage, in terms of large matrix cracks and delaminations as well as fiber breakages, the self-healing efficiency is limited. Originality/value The results obtained by SEM analysis as well as by ATR–FTIR spectroscopy constitute a strong indication that the self-healing mechanism has been activated. However, further investigation should be conducted in order to provide definite evidence.
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Guadagno, Liberata, Marialuigia Raimondo, Carlo Naddeo, Pasquale Longo, Annaluisa Mariconda, and Wolfgang H. Binder. "Healing efficiency and dynamic mechanical properties of self-healing epoxy systems." Smart Materials and Structures 23, no. 4 (February 20, 2014): 045001. http://dx.doi.org/10.1088/0964-1726/23/4/045001.

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Ahn, Chanjae, Pyong Hwa Hong, Juhen Lee, Jinsil Kim, Gyeongmin Moon, Sungkoo Lee, In Park, Haksoo Han, and Sung Woo Hong. "Highly Self-Healable Polymeric Coating Materials with Enhanced Mechanical Properties Based on the Charge Transfer Complex." Polymers 14, no. 23 (November 28, 2022): 5181. http://dx.doi.org/10.3390/polym14235181.

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Polymeric coating materials (PCMs) are promising candidates for developing next-generation flexible displays. However, PCMs are frequently subjected to external stimuli, making them highly susceptible to repeated damage. Therefore, in this study, a highly self-healing PCM based on a charge transfer complex (CTC) was developed, and its thermal, self-healing, and mechanical properties were examined. The self-healing material demonstrated improved thermal stability, fast self-healing kinetics (1 min), and a high self-healing efficiency (98.1%) via CTC-induced multiple interactions between the polymeric chains. In addition, it eliminated the trade-off between the mechanical strength and self-healing capability that is experienced by typical self-healing materials. The developed PCM achieved excellent self-healing and superior bulk (in-plane) and surface (out-of-plane) mechanical strengths compared to those of conventional engineering plastics such as polyether ether ketone (PEEK), polysulfone (PSU), and polyethersulfone (PES). These remarkable properties are attributed to the unique intermolecular structure resulting from strong CTC interactions. A mechanism for the improved self-healing and mechanical properties was also proposed by comparing the CTC-based self-healing PCMs with a non-CTC-based PCM.
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Zhang, Li, Ye Tian, and Yan Miao Ma. "The Analysis of Fracture Mechanics on Self-Healing Composite Materials with Microcapsules." Advanced Materials Research 591-593 (November 2012): 1143–46. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.1143.

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Fatigue failure of the mechanical parts has always been paid great attention to in mechanical engineering. In recent years the study on the self-healing composite materials with microcapsules provides a new way to solve it. In this paper, the fracture mechanics analysis on the self-healing composite material with microcapsules used for gear is carried out to determine whether it can achieve the self-healing. The results show that, only when the fracture toughness of the capsule shell and that of matrices matches in some way, can the self-healing be achieved. The composite material made of nylon 6 (PA6) as the matrix material, short E glass fiber as the reinforced material, poly ( urea-form aldehyde) encapsulated dicyclopentadiene (DCPD) as the self-healing microcapsule, is studied in this paper. The results show that this formula is feasible.
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Dissertations / Theses on the topic "Mechanical Self-healing"

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Wang, Yongjing. "Sustainable self-healing structural composites." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7177/.

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Self-healing composites are composite materials capable of automatic recovery when damaged. They are inspired by biological systems such as the human skin which are naturally able to heal themselves. Over the past two decades, two major self-healing concepts – based respectively on the use of capsules and vascular networks containing healing agents - have been proposed and material property recovery has been enhanced from 60% to nearly 100%. However, this improvement is still not sufficient to allow self-healing composites to be applied in practice because the healing capability varies with many external factors such as ambient temperatures and damage conditions. The key to the practical application of self-healing composites is to promote the sustainability of healing capacity to make the recovery robust. The thesis presents various techniques to enhance the healing capacity of fibre-reinforced composites to realise strong recovery regardless of ambient temperatures or material types. It presents the effects of various popular configurations of vascular networks on the flexural properties and healing performances of fibre-reinforced composites. The thesis demonstrates a design enabling recovery at ultra-low temperatures by using hollow vascular networks and porous heating elements. It also presents a new healing mechanism to repair the broken structural carbon fibres by incorporating conventional healing agents with short carbon fibres which could be aligned in an in situ electric field. The mechanism was also adopted to enable the restoration of the conductivity of a fibre-reinforced composite incorporating a porous conductive element, a carbon nanotube sheet, which could be used as a heating actuator or a sensing component. Thus, the development reported in this thesis have contributed to promoting the sustainability of the recovery of self-healing composites.
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Ahammed, Ballal. "MOLECULAR DYNAMICS SIMULATION OF SELF-HEALING POLYMERS." Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1564686567714321.

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Zhao, Jingwen. "Structure et propriétés des hydrogels à réticulation chimique et physique." Electronic Thesis or Diss., Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLET001.

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Des hydrogels résistants avec des points de réticulation permanents et temporaires ont été élaborés, et leur structure, leurs propriétés mécaniques et les mécanismes de renforcement ont été étudiés. L’origine de cet important renforcement mécanique vient de l’introduction de points de réticulation temporaires : la rupture de ces liaisons temporaires dissipe de l’énergie de déformation et redistribue les forces locales, qui protègent ainsi les liaisons permanentes qui à leur tour empêchent l’écoulement plastique du réseau. La rhéologie linéaire, les propriétés de traction non-linéaires et les propriétés de fracture de deux doubles réseaux ont été étudiées : un gel de poly(alcool vinylique) réticulé chimiquement par du glutaraldéhyde et réticulé physiquement par des ions borates (gel PVA-borax), et un gel de poly(acrylamide-co-1-vinylimidazole) réticulé chimiquement par du N,N’-Methylenebisacrylamide et réticulé physiquement par des ions métalliques (gel AAm-VIm-M2+). Ces deux doubles réseaux ont des temps de relaxation très différents, ce qui a permis l’étude de la dynamique sur une grande plage de temps. Pour des taux de déformation optimaux, les deux gels présentent un important renforcement mécanique en termes de raideur, de déformation à la rupture et de capacité à résister à la propagation de fissure. Cependant, l’extensibilité et la résistance à la fracture du gel AAm-VIm-M2+ augmentent avec le taux de déformation et avec [M2+] tandis que la tendance inverse est observée pour le système Borax, ce qui suggère que, au-delà du temps de relaxation principal en petites déformations, les détails de l’architecture du réseau chimique et physique à l’équilibre sont importants pour le processus de fracture
Tough hydrogels with permanent and transient crosslinks have been designed, and their structure, mechanical properties, and their reinforcement mechanisms have been investigated. The origin of this strong mechanical reinforcement comes from the introduction of the transient crosslinks, the breaking of these transient bonds dissipate strain energy and redistribute local forces, preventing the irreversible rupture of the permanent bonds, while the permanent bonds prevent the network from plastic flow. The linear rheology, nonlinear tensile and fracture properties of two different dual crosslink gels have been studied: a poly(vinyl alcohol) gel chemically crosslinked by glutaraldehyde and physically crosslinked with borate ion (PVA-borax gel), and a poly(acrylamide-co-1-vinylimidazole) gel chemically crosslinked by N,N'-Methylenebisacrylamide and physically crosslinked by metal ions (AAm-VIm-M2+ gel). These two dual crosslink gels have very different relaxation times, which made it possible to investigate the dynamics over a large time range. For optimized strain rates, both gel systems exhibited strong mechanical reinforcement in terms of stiffness, strain at failure, and the ability to resist crack propagation. However the extensibility and fracture toughness of the AAm-VIm-M2+ gel increased with strain rate and [M2+] while the opposite trend was observed for the Borax system, suggesting that, beyond the main relaxation time, the details of the chemical and equilibrium physical network architecture are important for the fracture process
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Li, Qiaochu Ph D. Massachusetts Institute of Technology. "Designing dynamic mechanics in self-healing nanocomposite hydrogels." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115711.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2018.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 127-136).
The functional versatility and endurable self-healing capacity of soft materials in nature is found to originate from the dynamic supramolecular scaffolds assembled via reversible interactions. To mimic this strategy, extensive efforts have been made to design polymer networks with transient crosslinks, which lays the foundation for synthetic self-healing hydrogels. Towards the development of stronger and faster self-healing hydrogels, understanding and controlling the gel network dynamics is of critical importance, since it provides design principles for key properties such as dynamic mechanics and self-healing performance. For this purpose, a universal strategy independent of exact crosslinking chemistry would be regulating the polymer material's dynamic behavior by optimal network design, yet current understanding of the relationship between network structure and macroscopic dynamic mechanics is still limited, and implementation of complex network structure has always been challenging. In this thesis, we show how the dynamic mechanical properties in a hydrogel can be controlled by rational design of polymer network structures. Using mussel-inspired reversible catechol coordination chemistry, we developed a nanocomposite hydrogel network (NP gel) with hierarchical assembly of polymer chains on iron oxide (Fe3O4) nanoparticles as network crosslinks. With NP gel as a model system, we first investigated its unique dynamic mechanics in comparison with traditional permanent and dynamic gels, and discovered a general approach to manipulate the network dynamics by controlling the crosslink structural functionality. Then we further explored the underlying relationship between polymer network structure and two key parameters in relaxation mechanics, which elucidated universal approaches for designing relaxation patterns in supramolecular transient gel network. Finally, by utilizing these design principles, we designed a hybrid gel network using two crosslinking structures with distinct relaxation timescales. By simply adjusting the ratio of two crosslinks, we can precisely tune the material's dynamic mechanics from a viscoelastic fluid to a rigid solid. Such controllability in dynamic mechanics enabled performance optimization towards mechanically rigid and fast self-healing hydrogel materials.
by Qiaochu Li.
Ph. D.
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Nguyen, Thanh Ha. "Influence de l'incorporation des bactéries et des granulats légers sur les performances des bétons à matrice cimentaire." Thesis, Cergy-Pontoise, 2019. http://www.theses.fr/2019CERG1011.

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Ce travail traite de l’auto-cicatrisation bactérienne de béton C35/45 de classe de consistance de S4 et une classe d'environnement d’exposition XF3.Un adjuvant bactérien a été incorporé à la formulation avec une concentration de 105 cellules/ml. Il est constitué de Bacillus Subtilis de peptone et d’extrait de levure. On montre que l’incorporation de l’adjuvant bactérien entraîne une diminution de la porosité et de la perméabilité aux gaz, une augmentation des résistances mécaniques, du module dynamique et une amélioration de la durabilité. Une auto-cicatrisation complète des échantillons micro fissurés a été observée à 44 jours. La validité de l'utilisation du modèle EuroCode 2, pour prédire l’acquisition des résistances au cours du temps, a été vérifiée et validée. Cependant on observe, qu’après 90 jours de cure, l’effet de l’adjuvant bactérien sur les propriétés étudiées s’estompe, phénomène dû au passage des bactéries d’un état actif à un état inactif et par conséquent d’une forme végétative à un état sporulé. Ainsi, l’utilisation de ce type d’adjuvant bactérien ne permettra pas la réparation des structures qui s’endommagent après quelques années de leur mise en service. La méthode, dite « indirecte », semble la mieux appropriée dans ces cas de figure. La bactérie est, alors, immobilisée avec des nutriments dans d'autres matériaux poreux. On propose d’utiliser les granulats légers de type argile expansée. Une étude préliminaire, conduite dans ce travail, consiste à trouver le % de granulats légers à incorporer dans la formulation du béton sans en affecter les propriétés d’usage. Pour ce faire une étude a été réalisée sur le mortier du béton équivalent. Six mortiers ont été élaborés en faisant varier le taux de substitution du sable naturel par le sable leger, Tv (0, 10%, 25%, 50%, 75%, 100%). Elle a conduit à l’établissement de relations entre les propriétés du mortier et sa résistance à la compression ainsi que sa masse volumique, cette dernière propriété étant reliée au taux d’incorporation, Tv, ainsi que la masse volumique du sable.On démontre que Tv=10% est la fraction volumique optimale de granulats légers. Un béton incorporant 10% de granulat léger a été élaboré et ses caractéristiques comparées au béton de contrôle. On montre que le béton incorporant 10% de granulat léger peut être utilisé comme un béton de structure
This work deals with bacterial self-healing of concrete of C35 / 45 resistance class, S4 consistency class and an XF3 exposure environment class.A bacterial adjuvant was included in the formulation with a concentration of 105 cells / ml. It consists of Bacillus Subtilis peptone and yeast extract. It is shown that the incorporation of the bacterial adjuvant results in a decrease in porosity and gas permeability, an increase in mechanical strength, dynamic modulus and an improvement in durability. Complete self-healing of micro fissured specimens was observed at 44 days. The validity of the use of the EuroCode 2 model, to predict the acquisition of resistances over the time, was verified and validated. However, it is observed that after 90 days, the effect of the bacterial adjuvant on the studied properties reaches a steady state, due to the passage of bacteria from an active state to an inactive state and therefore of a form vegetative to a sporulated state. Thus, the use of this type of bacterial adjuvant will not allow the repair of damaged structures after a few years of their service life. The so-called "indirect" method seems the most appropriate in these cases. The bacterium is, then, immobilized with nutrients in other porous materials. It is proposed to use expanded clay type aggregates.A preliminary study has been conducted in order to find the percentage of lightweight aggregates to incorporate in the concrete formulation without affecting the properties of use. Hence, six mortars were elaborated by incorporating different volumetric rates of lightweight sand (0%, 10%, 25%, 50%, 75% and 100%). Relationships between the mechanical and thermal characteristics and the compressive strength as well the density of mortars were established. The density was related to the rate of incorporation, Tv, as well as the density of the sand.It is exhibited that Tv = 10% is the optimum volume fraction of lightweight sand. A concrete incorporating 10% of lightweight aggregate has been formulated and its characteristics compared to control concrete. It is shown that concrete incorporating 10% light aggregate can be used as structural concrete
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Deshpande, Rutooj D. "UNDERSTANDING AND IMPROVING LITHIUM ION BATTERIES THROUGH MATHEMATICAL MODELING AND EXPERIMENTS." UKnowledge, 2011. http://uknowledge.uky.edu/cme_etds/4.

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There is an intense, worldwide effort to develop durable lithium ion batteries with high energy and power densities for a wide range of applications, including electric and hybrid electric vehicles. For improvement of battery technology understanding the capacity fading mechanism in batteries is of utmost importance. Novel electrode material and improved electrode designs are needed for high energy- high power batteries with less capacity fading. Furthermore, for applications such as automotive applications, precise cycle-life prediction of batteries is necessary. One of the critical challenges in advancing lithium ion battery technologies is fracture and decrepitation of the electrodes as a result of lithium diffusion during charging and discharging operations. When lithium is inserted in either the positive or negative electrode, there is a volume change associated with insertion or de-insertion. Diffusion-induced stresses (DISs) can therefore cause the nucleation and growth of cracks, leading to mechanical degradation of the batteries. With different mathematical models we studied the behavior of diffusion induces stresses and effects of electrode shape, size, concentration dependent material properties, pre-existing cracks, phase transformations, operating conditions etc. on the diffusion induced stresses. Thus we develop tools to guide the design of the electrode material with better mechanical stability for durable batteries. Along with mechanical degradation, chemical degradation of batteries also plays an important role in deciding battery cycle life. The instability of commonly employed electrolytes results in solid electrolyte interphase (SEI) formation. Although SEI formation contributes to irreversible capacity loss, the SEI layer is necessary, as it passivates the electrode-electrolyte interface from further solvent decomposition. SEI layer and diffusion induced stresses are inter-dependent and affect each-other. We study coupled chemical-mechanical degradation of electrode materials to understand the capacity fading of the battery with cycling. With the understanding of chemical and mechanical degradation, we develop a simple phenomenological model to predict battery life. On the experimental part we come up with a novel concept of using liquid metal alloy as a self-healing battery electrode. We develop a method to prepare thin film liquid gallium electrode on a conductive substrate. This enabled us to perform a series of electrochemical and characterization experiments which certify that liquid electrode undergo liquid-solid-liquid transition and thus self-heals the cracks formed during de-insertion. Thus the mechanical degradation can be avoided. We also perform ab-initio calculations to understand the equilibrium potential of various lithium-gallium phases.
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Solouki, Bonab Vahab. "Polyurethane (PU) Nanocomposites; Interplay of Composition, Morphology, and Properties." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1542634359353501.

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Yousfi, Ismail. "Caractérisation de l'endommagement thermique et mécanique dans le mortier par les ondes acoustiques non linéaires." Thèse, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/7941.

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Abstract : The objective of this work is the characterization of heat and mechanical damage in the mortar by the nonlinear acoustic waves. The correlation between non-linear/linear acoustic parameters and damage in mortar is studied based on experiments and modelling. Experimental measurements of non-linear acoustic parameters as a function of temperature and crack size were performed on mortar. The velocities showed a decrease when increasing the degradation and the non-linear parameters showed an increase when increasing the damage. For the heat damage, cylindrical specimens were prepared and were characterized by studying the porosity and saturation. Then, the temperature controls the degradation. Indeed, the linear acoustic (UPV) and non-linear acoustic (Higher harmonic generation) were applied to characterize the damage. The linear acoustic tests have shown that the longitudinal, transverse velocities and modulus of Young of the mortar decreases in function of the temperature. The non-linear acoustic tests have shown that beta increases in function of the temperature. For the mechanical damage and the self-healing, an annular specimens were prepared and cracked by controlling the size of each crack. Then the self-healing phenomenon was characterized by the permeability and the acoustic tests. Indeed, the permeability tests have shown that the airflow and the crack size decreases quickly in the first month then slowly for the rest of the self-healing process. On the other hand, the non-linear acoustic tests shown that the alpha and beta decreases according to the self-healing process which means that the nonlinear parameters are good indicators to characterize the self-healing. Moreover, the analysis of the experimental results indicates that the frequency resonant technique is more efficient to characterize the defects in the mortar than the higher harmonic generation. From the experimental tests and to get a general result independent for our case study, the nonlinear parameters were related to a damage index. A polynomial correlations of a 2nd degree was established between the nonlinear parameters and the index damage. A numerical model based on the finite element volume was proposed to establish a correlation between the crack size and the airflow. The numerical results were compared with the results of the permeability tests and shown a good agreement. The findings of this work should be most appropriate as a foundation for the study of the self-healing by the nonlinear acoustic waves.
Résumé : L'objectif de ce travail est la caractérisation de l’endommagement thermique et mécanique dans le mortier par les ondes acoustiques non linéaires. La corrélation entre les paramètres acoustiques linéaires et non linéaires est basée sur les essais expérimentaux et la modélisation. Des mesures expérimentales des paramètres acoustiques non linéaires en fonction de la taille de la fissure et la température ont été effectuées sur mortier. Les vitesses ont montré une diminution et les paramètres non linéaires ont montré une augmentation en augmentant le degré de fissuration. Pour l’endommagement thermique, des éprouvettes cylindriques ont été préparées et ont été caractérisées par l'étude de la porosité et de la saturation. L'acoustique linéaire (UPV) et l’acoustique non linéaire (génération d'harmoniques) ont été appliquées afin de quantifier l’endommagement. Les essais acoustiques linéaires ont montré que les vitesses transversales, longitudinales et le module d'Young du mortier diminuent en fonction de la température. Les essais acoustiques non linéaires ont montré l'augmentation du bêta est fonction de l’endommagement thermique. Pour l’endommagement mécanique et l'autocicatrisation, des anneaux de mortier ont été préparés et fissurés en contrôlant la taille de chaque fissure. Ensuite, le phénomène d'autocicatrisation est suivi par la perméabilité et des essais acoustiques. Les essais de perméabilité ont montré que le débit d'air et la taille de la fissure diminuent rapidement au cours du premier mois, puis lentement durant le reste du processus d'autocicatrisation. D'autre part, les tests acoustiques non linéaires ont montré que « alpha » et « bêta » diminuent durant le processus de l’autocicatrisation, ce qui signifie que les paramètres non linéaires sont des bons indicateurs pour caractériser ce phénomène. En outre, l'analyse des résultats expérimentaux indique que la technique de résonance de fréquence est plus efficace pour caractériser les défauts dans le mortier que la génération d'harmoniques plus élevés. À partir des essais expérimentaux et dans le but d'obtenir un résultat plus général indépendant de notre cas d’étude, les paramètres non linéaires ont été liés à un index d’endommagement. Une corrélation polynomiale de 2e degré a été établie entre les paramètres non linéaires et l’index d’endommagement. Un modèle numérique basé sur la méthode des volumes finis a été proposé afin d'établir une corrélation entre la taille de la fissure et le flux d'air. Les résultats numériques ont été comparés avec les résultats des tests de perméabilité et montré un bon accord. Les résultats de ce travail représentent un bon départ pour étudier le phénomène de l'autocicatrisation par les ondes acoustiques non linéaires.
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Yousfi, Ismail. "Caractérisation de l’endommagement thermique et mécanique dans le mortier par les ondes acoustiques non linéaires." Thesis, Ecole centrale de Lille, 2015. http://www.theses.fr/2015ECLI0009/document.

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L'objectif de ce travail est la caractérisation de l’endommagement thermique et mécanique dans le mortier par les ondes acoustiques non linéaires. La corrélation entre les paramètres acoustiques linéaires et non-linéaires étudiée est basée sur les essais expérimentaux et la modélisation. Pour l’endommagement thermique, des éprouvettes cylindriques ont été préparées et caractérisées par l'étude de la porosité et la saturation. Ensuite, l'acoustique linéaire et l’acoustique non linéaire (génération d'harmoniques) ont été appliquées afin de quantifier l’endommagement. Les essais acoustiques linéaires ont prouvé que les vitesses transversales, longitudinales et le module d'Young du mortier diminue en fonction de la température. Les essais acoustiques non linéaires ont montré l'augmentation du bêta fonction de la température. Pour l’endommagement mécanique, le phénomène d'autocicatrisation est suivi par la perméabilité et les essais acoustiques. Les essais de perméabilité ont montré que le débit d'air et la taille de la fissure diminue rapidement au cours du premier mois, puis lentement durant le reste du processus d'autocicatrisation. D'autre part, les tests acoustiques non linéaires ont montré que « alpha » et « bêta » diminuent durant le processus de l’autocicatrisation qui signifie que les paramètres non linéaires sont un bon indicateur pour caractériser ce phénomène. A partir des résultats expérimentaux, une corrélation polynomiale de 2ème degré a été établie entre les paramètres non linéaires et l’index d’endommagement. Les résultats de ce travail représentent un bon départ pour étudier le phénomène de l'autocicatrisation par les ondes acoustiques non linéaires
The objective of this work is the characterization of heat and mechanical damage in the mortar by the nonlinear acoustic waves. The correlation between non-linear/linear acoustic parameters and damage in mortar is studied based on experiments and modelling. For the heat damage, cylindrical specimens were prepared and were characterized by studying the porosity and saturation. Indeed, the linear acoustic (UPV) and non-linear acoustic (Higher harmonic generation) were applied to characterize the damage. The linear acoustic tests have shown that velocities and modulus of Young of the mortar decreases in function of the temperature. The non-linear acoustic tests have shown that beta increases in function of the temperature.For the mechanical damage. The self-healing phenomenon was characterized by the permeability and the acoustic tests. Indeed, the permeability tests have shown that the airflow and the crack size decreases quickly in the first month then slowly for the rest of the self-healing process. On the other hand, the non-linear acoustic tests shown that the alpha and beta decreases according to the self healing process which means that the nonlinear parameters are a good indicators to characterize the self-healing. Moreover, the analysis of the experimental results indicates that the frequency resonant technique is more efficient to characterize the defects in the mortar than the higher harmonic generation. A polynomial correlations of a 2nd degree was established between the nonlinear parameters and the index damage. The findings of this work should be most appropriate as a foundation for the study of the self healing by the nonlinear acoustic waves
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Merindol, Rémi. "Layer-by-layer assembly of strong bio-inspired nanocomposites." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAE015/document.

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Les performances exceptionnelles des composites naturels comme la nacre ou le bois émergent de l’arrangement précis d’éléments souples et rigides à l’échelle nanométrique. L’assemblage couche-par-couche permet la fabrication de films avec un contrôle nanométrique de l’organisation et de la composition. Ce travail décrit l’assemblage et les propriétés de nouveaux nano-composites contenant des nano-renforts 1-D (fibrilles de cellulose) et 2-D (plaquettes d’argile). Nous avons combiné les argiles avec une matrice extrêmement souple de poly(diméthylsiloxane) dans une architecture lamellaire imitant celle de la nacre. Nous avons étudié des composites à base de fibrilles de cellulose aléatoirement orientées dans le plan, puis alignées dans une direction pour mieux imiter les parois cellulaires du bois. Les propriétés mécaniques de ces composites bio-inspirés égalent ou surpassent celles de leurs homologues naturels, tout en étant transparents et dans certains cas auto-réparants
Natural materials such as nacre or wood gain their exceptional mechanical performances from the precise organisation of rigid and soft components at the nano-scale. Layer-by-layer assembly allows the preparation of films with a nano-scale control over their organisation and composition. This work describes the assembly and properties of new nano-composites containing 1-D (cellulose nano-fibrils) and 2-D (clay nano-platelets) reinforcing elements. The clay platelets were combined with an extremely soft matrix (poly(dimethylsiloxane)) to mimic the lamellar architecture of nacre. Cellulose based composites with a random in plane orientation of the fibrils were studied first, later we aligned the fibrils in a single direction to mimic further the cell wall of wood. The mechanical properties of these bio-inspired composites match or surpass those of their natural counterparts, while being transparent and in one case self-repairing
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Books on the topic "Mechanical Self-healing"

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K, Rohatgi P., ed. Biomimetics in materials science: Self-healing, self-lubricating, and self-cleaning materials. New York, NY: Springer, 2012.

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Rooij, Mario de. Self-Healing Phenomena in Cement-Based Materials: State-of-the-Art Report of RILEM Technical Committee 221-SHC: Self-Healing Phenomena in Cement-Based Materials. Dordrecht: Springer Netherlands, 2013.

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Healable Polymer Systems. Royal Society of Chemistry, The, 2013.

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Hayes, Wayne, Marek W. Urban, Christopher J. Kloxin, Michael W. Keller, and Stuart J. Rowan. Healable Polymer Systems. Royal Society of Chemistry, The, 2013.

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Li, Guoqiang. Self-Healing Composites. Wiley & Sons, Incorporated, John, 2014.

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Li, Guoqiang. Self-Healing Composites: Shape Memory Polymer Based Structures. Wiley & Sons, Incorporated, John, 2014.

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Li, Guoqiang. Self-Healing Composites: Shape Memory Polymer Based Structures. Wiley & Sons, Incorporated, John, 2014.

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Li, Guoqiang. Self-Healing Composites: Shape Memory Polymer Based Structures. Wiley & Sons, Limited, John, 2014.

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Li, Guoqiang. Self-Healing Composites: Shape Memory Polymer Based Structures. Wiley, 2014.

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Self Healing Materials Springer Series in Materials Science. Springer, 2007.

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Book chapters on the topic "Mechanical Self-healing"

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Specht, Steffen, Joachim Bluhm, and Jörg Schröder. "Continuum Mechanical Description of an Extrinsic and Autonomous Self-Healing Material Based on the Theory of Porous Media." In Self-healing Materials, 143–84. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/12_2015_338.

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Gupta, Nitin Kumar, Nalin Somani, Tushar Panwar, Nishant Ranaa, Faisal Ahmeda, and Abhinav Dimri. "An Outlook on Self-healing Materials." In Lecture Notes in Mechanical Engineering, 245–54. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4147-4_26.

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Li, V. C., A. R. Sakulich, H. W. Reinhardt, E. Schlangen, K. Van Tittelboom, D. Snoeck, N. De Belie, et al. "Recovery against Mechanical Actions." In Self-Healing Phenomena in Cement-Based Materials, 119–215. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6624-2_4.

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Jacob, Chinnu Susan, and Vidya Jose. "Study on Mechanical Properties of Self Healing Self Curing Concrete." In Lecture Notes in Civil Engineering, 935–43. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-26365-2_85.

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Shinya, Norio. "Self Healing of Mechanical Damage in Metallic Materials." In Advances in Science and Technology, 152–57. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908158-11-7.152.

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Gupta, Nitin Kumar, Manoj Kumar, and G. D. Thakre. "Mechanical Characterization of 60Pb40Sn Reinforced Al6061 Self-healing Composite." In Lecture Notes in Mechanical Engineering, 49–59. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4059-2_4.

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Yarin, Alexander L., Min Wook Lee, Seongpil An, and Sam S. Yoon. "Self-Healing of Mechanical Properties: Evaluation by Tensile Testing." In Advanced Structured Materials, 165–94. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05267-6_7.

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Osada, Toshio, Wataru Nakao, Koji Takahashi, and Kotoji Ando. "Self-Crack-Healing Behavior Under Combustion Gas Atmosphere." In Mechanical Properties and Performance of Engineering Ceramics and Composites IV, 155–66. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470584262.ch14.

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Gupta, Nitin Kumar, G. D. Thakre, and Manoj Kumar. "Self-Healing Al 6061 Alloy Reinforced with Low Melting Point Alloys." In Lecture Notes in Mechanical Engineering, 543–50. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6412-9_53.

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Sreenatha Reddy, S., Rajagopal Dhanasekaran, Sujeet Kumar, Shiv Shankar Kanwar, R. Shruthi, and T. Navaneetha. "Studies on Application and Mechanism of Self-Healing Polymer and Nanocomposite Materials." In Lecture Notes in Mechanical Engineering, 487–97. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1124-0_42.

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Conference papers on the topic "Mechanical Self-healing"

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Barbero, Ever J., and Paolo Lonetti. "Application of Continuum Damage Healing Mechanics to Self-Healing Composites." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43738.

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Contimuum Damage Healig Mechanics is an extension of CDM recently developed by the authors to model healing process in a variety of materials including rock salt, sinterized metals, ceramics, and polymer-matrix composties, bone and so. on. While the theoretical framework, of CDHM is general, parameter identification depends on the particular material being modeled and the specific material tests that are feasible to conduct for that class of materials. This presentation deals with the application of CDHM to the specific field of fiber-reinforced polymer-matrix composites. An overview of CDHM will be presented followed by a description of parameter identification. Results are shown in order in validate the numerical model of healing behavior of damaged polymeric matrix composite. Healed and not healed cases discussed in order show the model capability and to describe possible evoltution of the healed system.
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Ibrahim, Mohamed A., Iman S. El-Mahallawi, Tarek M. Hatem, and Sarah Khalil. "Intrinsic Mechanisms of Self-Healing in Metallic Structures." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24094.

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Abstract Self-healing is the ability of a material to repair damages automatically. Approaches to self-healing are separated into two major categories, those are: 1) autonomous healing methods that depend on intrinsic mechanisms, and 2) assisted healing methods that need an external intervention. Recently, computational methods have gained a wide application to study self-healing in metals using molecular dynamics (MD) and finite element (FE) methods. These methods can be used to demonstrate and optimize different metallic alloys potential to self-heal, and to further tailor these metallic structures toward improving their mechanical and fracture properties through self-healing. Computational studies of self-healing phenomenon in metals have been small in number and scope till recently. Therefore, the current paper starts with a general introduction of different mechanisms of intrinsic self-healing in metallic structures. The paper highlights previous studies using different experimental and computational approaches to explore self-healing in metallic systems, while focusing on Iron/Steel alloys. Furthermore, the paper present authors work to study self-healing and its impact on mechanical properties of Iron. Simulations are carried on bi-crystalline iron sample to investigate the effect of alloying elements diffusion on the fracture / healing properties of iron alloys and their impact on its mechanical properties. Then the effect of the alloying elements diffusion on healing is studied upon stress application after annealing. Different samples been compared to healthy samples and cracked samples without self-healing to demonstrate the effectiveness of self-healing in Iron alloys.
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Bakhtiyarov, Sayavur I., and Elguja R. Kutelia. "Bio-Inspired Engineering: Self-Healing Materials." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65030.

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The objective of this study was to develop a composite metallic material with self-healing capabilities. A developed heterogeneous metal/ceramic composite is able to self-heal at temperatures as high as 1,200 °C.
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Jung, D., A. Hegeman, N. R. Sottos, P. H. Geubelle, and S. R. White. "Self-Healing Composites Using Embedded Microspheres." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0673.

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Abstract A self-repairing polyester matrix composite material is described which utilizes embedded polyoxymethylene urea (PMU) microspheres to store a crack filling agent to be released into the crack and rebond the crack faces. The developed repair mechanism uses naturally occurring functional sites in the polyester matrix network to trigger the repair action. The repair agent is mostly composed of styrene monomers and high molecular weight polystyrene. Microscopic observations of the microsphere/crack interaction are presented. Of particular interest is the process with which the microspheres break and release their content when encountered by a crack. The effects of the microspheres on the stiffness and toughness of the polyester resin are also studied. Using standard tensile samples, the composite elastic modulus has been found to decrease with the volume fraction of microspheres, while the fracture toughness of tapered double cantilever beam (TDCB) specimens is shown to reach a maximum value at approximately 10% volume fraction. Examinations of the fracture surfaces show tails extending from the microspheres, indicating crack pinning and crack front bowing as the primary toughening mechanisms. An enhanced level of adhesion between the microsphere and matrix has been found to decrease the composite fracture toughness and increase the incidence of sphere breakage on the fracture surface.
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Martinez Lucci, Jose, R. S. Amano, Pradeep Rohatgi, and Benjamin Schultz. "Experiment and Computational Analysis of Self-Healing in an Aluminum Alloy." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68304.

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The development of self-healing metals is a novel idea that has not been explored in great detail yet. The concept of self-healing described in this paper consists of incorporating a low temperature melting alloy imbedded within a higher temperature alloy to create a self healing composite (SHC). When the SHC is damaged or cracked, heat may be applied to the affected area whereupon the low melting alloy will melt and flow into the crack healing the damage and sealing the crack. This study consists of theoretical analysis and design of self-healing in aluminum alloy matrix. The experimental and Computational Fluid Dynamics of a self-healing were designed by the authors, the design consists in an aluminum alloy matrix reinforced with microtubes of alumina (Al2O3) that are filled with a low melting point solder alloy. The objective of the study reported here was to find the influence and efficiency of a low melting solder alloy in healing an aluminum matrix. To check this effect a crack was created in the metal surface, piercing the microtube(s) filled with solder, and then the SHC was heated above the melting point of the solder alloy to melt and examine the flow of molten solder alloy into the crack.
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Wan, Baoquan, and Jun-Wei Zha. "Self-Healing of Electrical/Mechanical Damage in Smart Copolyimide." In 2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE). IEEE, 2022. http://dx.doi.org/10.1109/ichve53725.2022.9961746.

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Rae, S. I., I. P. Bond, R. S. Trask, and D. F. Wass. "Novel Self-Healing Systems: Expanding and Inhibited Healing Agents." In ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/smasis2014-7637.

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A new approach to self-healing systems is presented that aims to overcome the inherent drawbacks of conventional liquid resin based healing systems within composites. Finite embedded systems offer limited healing potential for small volume delaminations and as such cannot effectively heal large damage volumes often associated with shear damaged sandwich panel structures or debonding between skin and core. An expanding polymer based approach aims to overcome such limitations. The mechanical and physical properties of a prepared polyepoxide foam are investigated and how the inclusion of a carbon fibre reinforcement within the foam affects processability and performance. The healing efficiency of different polymer foams to heal damaged structures is also investigated. A secondary investigation is also presented that aimed to overcome the drawbacks associated with the requirement for stoichiometric mixing of two part healing agents, or for healing agent to come into direct contact with a catalyst embedded within the matrix material. Different approaches were taken to develop a self-healing system that once deployed required no additional mixing or stimuli for healing to occur.
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Phamduy, Paul, and Byungki Kim. "Microcapsules Containing Solvent and Epoxy With Multi-Walled Carbon Nanotubes for Self-Healing." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38040.

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Microcapsules containing epoxy resin EPON 862, phenyl acetate solvent, and multi-walled carbon nanotubes were fabricated by in-situ polymerization for the development of a self-healing composite. The microcapsules were embedded in an epoxy matrix in single-edged notch bend shapes for fracture testing on a three-point bend test fixture. Healing efficiency was calculated for specimens with various microcapsule loading ratios. Fracture tests confirmed healing ability with the microcapsules. Preliminary results indicated higher healing efficiencies with increased microcapsule loading.
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Gontcharov, Alexandre, Joe Liburdi, Paul Lowden, Douglas Nagy, and Nikesh Patel. "Self Healing Fusion Welding Technology." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26412.

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The properties of laser, microplasma and GTAW welds on representative gas turbine blade materials are disclosed. Proprietary filler materials and technology were used to clad multipass welds onto IN738, RenéN5 and CMSX4 alloys which were then subject to vacuum heat treatment before testing. It was found that welds with a bulk content of boron up to 0.6 wt. % demonstrated a capability to heal cracks adjacent to the fusion line (HAZ cracks) and they exhibited superior tensile and stress-rupture properties at a temperature of 982°C. Welds that comprised 1.5 to 2% silicon had superior oxidation resistance at a temperature of 995°C. Combined alloying of welds with moderate amount of boron and silicon produced a unique combination of both high mechanical and oxidation properties. Healing of HAZ cracks took place during post weld heat treatment at a temperature exceeding the solidus temperature of the weld metal eutectics but below of a solidus temperature of the base material. It was found that boron and silicon additives reduced welding pool solidification temperature and increased the solidus–liquidus range. At this temperature a partial re-melt of eutectics occurred allowing healing of HAZ and weld solidification cracks while weld geometry was supported by a continuous framework of high temperature dendrites. This allows the tip repair of turbine blades manufactured of precipitation strengthened superalloys that are normally prone to weld cracking.
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Karpov, Eduard G., and Mykhailo V. Grankin. "Nondeterministic Multiscale Modelling of Biomimetic Crack Self-Healing in Nanocrystalline Materials." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40601.

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A nondeterministic multiple scale approach based on numerical solution of the Monte-Carlo master equation coupled with a standard finite-element formulation of material mechanics is presented. The approach is illustrated in application to the processes of long-term self-diffusion, precipitation and crack/void healing in nanocrystalline bcc and fcc solids. Effect of static and dynamic loading patterns on the crack healing rates are investigated. The approach is widely applicable to the modeling and characterization of advanced functional materials with evolutionary internal structure.
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Reports on the topic "Mechanical Self-healing"

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Huang, Cihang, Yen-Fang Su, and Na Lu. Self-Healing Cementitious Composites (SHCC) with Ultrahigh Ductility for Pavement and Bridge Construction. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317403.

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Cracks and their formations in concrete structures have been a common and long-lived problem, mainly due to the intrinsic brittleness of the concrete. Concrete structures, such as rigid pavement and bridge decks, are prone to deformations and deteriorations caused by shrinkage, temperature fluctuation, and traffic load, which can affect their service life. Rehabilitation of concrete structures is expensive and challenging—not only from maintenance viewpoints but also because they cannot be used for services during maintenance. It is critical to significantly improve the ductility of concrete to overcome such issues and to enable better infrastructure quality. To this end, the self-healing cementitious composites (SHCC) investigated in this work could be a promising solution to the aforementioned problems. In this project, the team has designed a series of cementitious composites to investigate their mechanical performances and self-healing abilities. Firstly, various types of fibers were investigated for improving ductility of the designed SHCC. To enhance the self-healing of SHCC, we proposed and examined that the combination of the internal curing method with SHCC mixture design can further improve self-healing performance. Three types of internal curing agents were used on the SHCC mixture design, and their self-healing efficiency was evaluated by multiple destructive and non-destructive tests. Results indicated a significant improvement in the self-healing capacity with the incorporation of internal curing agents such as zeolite and lightweight aggregate. To control the fiber distribution and workability of the SHCC, the mix design was further adjusted by controlling rheology using different types of viscosity modifiers. The team also explored the feasibility of the incorporation of colloidal nano-silica into the mix design of SHCC. Results suggest that optimum amounts of nano-silica have positive influence on self-healing efficiency and mechanical properties of the SHCC. Better hydration was also achieved by adding the nano-silica. The bonding strength of the SHCC with conventional concrete was also improved. At last, a standardized mixing procedure for the large scale SHCC was drafted and proposed.
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