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Статті в журналах з теми "Friction-induced structures"
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Stelter, Peter. "Nonlinear vibrations of structures induced by dry friction." Nonlinear Dynamics 3, no. 5 (1992): 329–45. http://dx.doi.org/10.1007/bf00045070.
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Tovstopyat-Nelip, I., and H. G. E. Hentschel. "Friction and noise-induced coherent structures in boundary lubrication." Physical Review E 61, no. 4 (2000): 3318–24. http://dx.doi.org/10.1103/physreve.61.3318.
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Eichstädt, J., G. R. B. E. Römer, and A. J. Huis in’t Veld. "Towards Friction Control using laser-induced periodic Surface Structures." Physics Procedia 12 (2011): 7–15. http://dx.doi.org/10.1016/j.phpro.2011.03.099.
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Rung, Stefan, Kevin Bokan, Frederick Kleinwort, et al. "Possibilities of Dry and Lubricated Friction Modification Enabled by Different Ultrashort Laser-Based Surface Structuring Methods." Lubricants 7, no. 5 (2019): 43. http://dx.doi.org/10.3390/lubricants7050043.
Повний текст джерелаАнотація:
In this contribution we report on the possibilities of dry and lubricated friction modification introduced by different laser surface texturing methods. We compare the potential of Laser-Induced Periodic Surface Structures and Laser Beam Interference Ablation on 100Cr6 steel in a linear reciprocating ball-on-disc configuration using 100Cr6 steel and tungsten carbide balls with load forces between 50 mN and 1000 mN. For dry friction, we find a possibility to reduce the coefficient of friction and we observe a pronounced direction dependency for surfaces fabricated by Laser Beam Interference Ablation. Furthermore, Laser-Induced Periodic Surface Structures result in a load-dependent friction reduction for lubricated linear reciprocating movements. This work helps to identify the modification behaviour of laser generated micro structures with feature sizes of approximately 1 µm and reveals new possibilities for surface engineering.
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van der Poel, Sanne, Marek Mezera, Gert-willem Römer, Erik de Vries, and Dave Matthews. "Fabricating Laser-Induced Periodic Surface Structures on Medical Grade Cobalt–Chrome–Molybdenum: Tribological, Wetting and Leaching Properties." Lubricants 7, no. 8 (2019): 70. http://dx.doi.org/10.3390/lubricants7080070.
Повний текст джерелаАнотація:
Hip-implants structured with anti-bacterial textures should show a low-friction coefficient and should not leach hazardous substances into the human body. The surface of a typical material used for hip-implants, namely Cobalt–Chrome–Molybdenum (CoCrMo) was textured with different types of laser-induced periodic surface structures (LIPSS)—i.e., low spatial frequency LIPSS (LSFL), hierarchical structures consisting of grooves superimposed with high spatial frequency LIPSS (HSFL) and Triangular shaped Nanopillars (TNP)—using a picosecond pulsed laser source. The effect of LIPSS on the wettability, friction, as well as wear of the structures, when slid against a polyethylene (PE) counter surface and biocompatibility was analyzed. Surfaces covered with LSFL show superhydrophobicity and grooves with superimposed HSFL, as well as TNP, show hydrophobic behavior. The coefficient of friction (CoF) of LIPSS against a polyethylene (PE) counter surface was found to be higher (ranging from 0.40 to 0.66) than the CoF of (polished) CoCrMo, which was found to equal 0.22. It was found that the samples release cobalt within biocompatible limits. Compared to polished reference surfaces, LIPSS cause higher friction of CoCrMo against PE contact. However, the wear of the PE counter surface only increased significantly for the LSFL textures. For these reasons, it is concluded that LIPSS are not suitable for a heavily loaded metal-on-plastic bearing contact.
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Shohag, Md Abu S., Zhengqian Jiang, Emily C. Hammel, et al. "Development of friction-induced triboluminescent sensor for load monitoring." Journal of Intelligent Material Systems and Structures 29, no. 5 (2017): 883–95. http://dx.doi.org/10.1177/1045389x17721049.
Повний текст джерелаАнотація:
Real-time load monitoring of critical civil and mechanical structures especially dynamic structures such as wind turbine blades is imperative for longer service life. This article proposed a novel sensor system based on the proprietary in situ triboluminescent optical fiber (ITOF) sensor for dynamic load monitoring. The new ITOF sensor patch consists of an ITOF sensor network with micro-exciters integrated within a polymer matrix. The sensor patch was subjected to repeated flexural loading and produced triboluminescent emissions due to the friction between micro-exciters and ITOF sensors corresponding to each loading cycle. The friction-induced triboluminescent intensity directly depends on the loading rate, the coefficient of friction, and the applied load on patch. In general, the triboluminescent intensity increases exponentially with an increase in load. Additionally, the sensor patches comprising the coarser micro-exciters exhibited better results. Similarly, better results were achieved at higher loading rates although a threshold loading rate is required to excite the triboluminescent crystals for this sample configuration. The proposed new sensor has the ability to monitor dynamic continuous applied loads.
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Zheng, Jin, Bo Chen, and Chun Yang Ye. "Energy Properties of Building Structures Subjected to Strong Earthquake." Advanced Materials Research 150-151 (October 2010): 1570–73. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.1570.
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The evaluation on energy characteristics of earthquake-excited building structures with seismic protection devices is actively carried out in this study. The mechanical model of passive friction dampers is first introduced and the dynamic model of building-damper system is proposed. The evaluation criteria of energy responses are developed and applied to the earthquake response mitigation of a real multi-story building incorporated with friction dampers. The observations indicate that the earthquake-induced vibration of the structure can be substantially suppressed and the proposed energy evaluation criteria can be effectively utilized in the examination on seismic mitigation performance.
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Onufrijevs, Pavels, Liga Grase, Juozas Padgurskas, et al. "Anisotropy of the Tribological Performance of Periodically Oxidated Laser-Induced Periodic Surface Structures." Coatings 13, no. 7 (2023): 1199. http://dx.doi.org/10.3390/coatings13071199.
Повний текст джерелаАнотація:
Laser-induced periodic surface structures (LIPSS) enable advanced surface functionalization with broad applications in various fields such as micro- and nanoelectronics, medicine, microbiology, tribology, anti-icing systems, and more. This study demonstrates the possibility of achieving anisotropy in the tribological behavior of C45-grade steel structured by nanosecond laser radiation using the LIPSS method. The lateral surface of the steel roller was irradiated with a pulsed Nd:YAG laser at an optimum intensity I = 870 MW/cm2 for the formation of LIPSS. Two sets of samples were formed with LIPSS that were perpendicular and parallel to the roller’s rotational motion direction. The Raman intensity maps revealed that the LIPSS structure consisted of periodically arranged oxides at the top of hills. At the same time, the valleys of the LIPSS structures were almost not oxidized. These results correlated well with scanning electron microscopy energy dispersive X-ray spectroscopy mapping and atomic force microscopy measurements. A comparison of Raman and X-ray photoelectron spectroscopy spectra revealed that both the magnetite phase and traces of the hematite phase were present on the surface of the samples. Tribological tests were performed in two cycles with periodic changes in the normal clamping force and sliding speed. It was found that the LIPSS structures which were formed perpendicularly to the sliding direction on the roller had a significantly greater impact on the friction processes. Structures oriented perpendicular to the direction of motion had a positive influence on reducing the energy consumption of a friction process as well as increasing the wear resistance compared to LIPSS formed parallel to the direction of motion or ones having a non-texturized surface. Laser texturing to produce LIPSS perpendicular to the direction of motion could be recommended for friction pairs operating under low-load conditions.
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Dong, Ping, and Jian Fan. "Semiactive Wind Response Control of 76-Story Benchmark Building with Smart Piezoelectric Friction Dampers." Advanced Materials Research 250-253 (May 2011): 2196–201. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.2196.
Повний текст джерелаАнотація:
A smart piezoelectric friction damper (SPFD) is presented based on improved Pall friction dampers and its damping force model is analyzed. The wind-induced vibration control of Benchmark model using semi-active control strategies based on the classical LQR is studied. The results of simulation analysis show that the semi-active control effects of the standard wind-control model with SPFD is evident. Compared to uncontrolled structures, the wind-induced vibration responses of the controlled structures are effectively reduced. In addition, parameter optimization of the semi-active control system based on the limit Hrovat optimal control algorithm is carried out. The analysis shows that the robustness of the semi-active control system to the stiffness uncertainty of Benchmark Model is very good, but the robustness to the damping uncertainty is not so good.
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Kolesnikov, V. I., S. F. Ermakov, E. B. Shershnev, and A. P. Sychev. "Structural-induced lubricity of liquid crystal nanomaterials of cholesterol at metal friction." Доклады Академии наук 488, no. 1 (2019): 24–28. http://dx.doi.org/10.31857/s0869-5652488124-28.
Повний текст джерелаАнотація:
Experimentally, it was found that with the change in temperature there is a structural-induced increase in the lubricating capacity of liquid-crystal nanomaterials induced by transformations in the cholesteric mesophase. It is shown that in this temperature range, the minimum values of the friction coefficient practically coincide with the peak values of the dynamic viscosity, which together indicates in favor of the ordered state of the cholesterol liquid-crystal structures at these temperatures. As a result, it can be assumed that in this temperature range, spirally twisted layers of liquid-crystal cholesterol molecules with high antifriction action are formed in the friction zone. It is noted that the thickness of the friction-implemented cholesteric liquid-crystal films is sensitive to temperature changes in the contact area, changing the color and energy loss.
Дисертації з теми "Friction-induced structures"
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Sadet, Jérémy. "Surrogate models for the analysis of friction induced vibrations under uncertainty." Electronic Thesis or Diss., Valenciennes, Université Polytechnique Hauts-de-France, 2022. http://www.theses.fr/2022UPHF0014.
Повний текст джерелаАнотація:
Le crissement automobile est une nuisance sonore qui intéresse à la fois les chercheurs et les industriels. Ce phénomène fugace, perçu par les acquéreurs de véhicule comme gage de piètre qualité, induit un coût de plus en plus important pour les équipementiers automobiles dû aux réclamations-client. Par conséquent, il est primordial de proposer et développer des méthodes permettant de prédire avec efficacité l’occurrence de cette nuisance sonore grâce à des modèles de simulation numérique. Ainsi, cette thèse se propose de poursuivre les récents travaux montrant l’apport certain d’une intégration des incertitudes au sein des simulations numériques de crissement. L’objectif est de proposer une stratégie de propagation d’incertitudes pour des simulations de crissement en maintenant des coûts numériques acceptables (en phase d’avant-projet). Plusieurs méthodes numériques sont évaluées et améliorées pour permettre des calculs à la fois précis et dans des temps de calcul compatibles avec les contraintes de l’industrie. Après avoir positionné ce travail de thèse par rapport aux avancées des chercheurs travaillant sur la thématique du crissement, une nouvelle méthode d’amélioration des solutions propres d’un problème aux valeurs propres complexes est proposée. Pour réduire les coûts numériques de telles études, trois modèles de substitution (processus gaussien, processus gaussien profond et réseau de neurones profonds) sont étudiés et comparés pour proposer les stratégies optimales que ce soit en termes de méthode ou de paramétrage. La construction de l’ensemble d’apprentissage est un élément clé pour assurer les futures prédictions des modèles de substitution. Une nouvelle stratégie/méthode d’optimisation exploitant l’optimisation bayésienne est présentée pour cibler idéalement le choix des données de l’ensemble d’apprentissage, données potentiellement coûteuses d’un point de vue numérique. Ces méthodes sont ensuite exploitées pour proposer une technique de propagation des incertitudes selon une modélisation par sous-ensembles flous<br>The automotive squeal is a noise disturbance, which has won the interest of the research and industrialists over the year. This elusive phenomenon, perceived by the vehicle purchasers as a poor-quality indicator, causes a cost which becomes more and more important for the car manufacturers, due to client’s claims. Thus, it is all the more important to propose and develop methods allowing predicting the occurring of this noise disturbance with efficiency, thanks to numerical simulations. Hence, this thesis proposes to pursue the recent works that showed the certain contributions of an integration of uncertainties into the squeal numerical simulations. The objective is to suggest a strategy of uncertainty propagation, for squeal simulations, maintaining numerical cost acceptable (especially, for pre-design phases). Several numerical methods are evaluated and improved to allow precise computations and with computational time compatible with the constraints of the industry. After positioning this thesis work with respect to the progress of the researchers working on the squeal subject, a new numerical method is proposed to improve the computation of the eigensolutions of a large quadratic eigenvalue problem. To reduce the numerical cost of such studies, three surrogate models (gaussian process, deep gaussian process and deep neural network) are studied and compared to suggest the optimal strategy in terms of methodology or model setting. The construction of the training set is a key aspect to insure the predictions of these surrogate models. A new optimisation strategy, hinging on bayesian optimisation, is proposed to efficiently target the samples of the training set, samples which are probably expensive to compute from a numerical point of view. These optimisation methods are then used to present a new uncertainty propagation method, relying on a fuzzy set modelisation
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Boschkova, Katrin. "Adsorption and frictional properties of surfactant assemblies at surfaces." Doctoral thesis, KTH, Chemistry, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3296.
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Corradi, Grégoire. "Approches numérique et expérimentale pour des structures à interfaces frottantes : Application au crissement de frein." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEC044.
Повний текст джерелаАнотація:
Les systèmes de freins sont parfois sujets au crissement qui sont des vibrations auto-entretenues induites par le frottement et caractérisées par un contenu fréquentiel formé de raies à hautes fréquences supérieures à 1kHz. Ces vibrations et bruits intenses sont une source de gêne pour les usagers automobile, un problème de santé publique pour les riverains de gares lors du freinage de TGV et peuvent amener à l'endommagement du train d'atterrissage sur les avions.Afin de comprendre ce phénomène et pour le reproduire numériquement, une stratégie complète d'étude est développée. Elle se base sur l'observation expérimentale d'essais de crissement sur un banc d'essais qui permet de formuler des hypothèses de modélisation. Ces dernières sont un guide pour la construction d'un modèle numérique de frein simple. Une méthode de Double Synthèse Modale est appliquée au modèle afin d'en réduire la taille et de permettre des simulation numériques en temps raisonnable et ne nécessitant pas trop de ressources informatiques.La démarche numérique qui suit commence classiquement par une analyse de stabilité par la méthode CEA où les valeurs propres du modèle linéarisé autour de la position d'équilibre glissante sont évaluées. Puis une intégration temporelle est effectuée dans les cas détectés comme instables afin de calculer les niveaux de vibrations. L'étude se termine par une estimation du champ acoustique rayonné par la structure complète.Dans chacune des phases de l'analyse numérique, des outils spécifiques sont utilisés pour comparer le modèle de référence aux modèles obtenus par les deux étapes de réduction. Un critère d'erreur sur les valeurs propres et un critère de MAC sont utilisés pour l'analyse de stabilité. Pour l'étude temporelle, les allures des signaux sont comparées, ainsi que leurs cycles limites et leurs spectrogrammes. Les participations des modes instables sont également calculées pour observer le régime transitoire. En ce qui concerne la partie acoustique, les signaux sont comparés dans un premier temps de façon qualitative pour observer les différences entre les champs émis en fonction des différentes tailles de bases de réduction. Puis un outil basé sur une décomposition en 2D par wavelet des motifs acoustiques est introduit et appliqué pour estimer de façon quantitative les convergences des champs rayonnés<br>Brake systems are sometimes prone to squeal noise, which is due to friction-induced self-sustained vibrations, characterized by a set of frequencies above 1kHz. Those vibrations and resulting noises are a source of perturbations for car occupants, which can be nowadays considered as a health issue.This thesis deals with a global strategy to better understand this phenomenon from an experimental point of view and to propose the prediction of squeal noise by numerical approaches. Moreover, experimental observations of squeal occurrences are analyzed to lead to assumptions about the modelisation of numerical finite element models for squeal prediction. A Double Modal Synthesis is also applied to reduce the size of the discrete finite element model of brake system and to save computational time and ressources. The proposed numerical approach starts with a stability analysis with the classical CEA method. Then the determination of nonlinear self-excited vibrations are performed for the unstable cases detected via the CEA method. Finally the acoustic field emitted by the brake system is computed to predict squeal noise.Specific tools are applied for each computational step to assess the efficiency of reduced model versus the reference model: criteria based on the mean error on eigenvalues and the Modal Assurance Criterion analysis (MAC) are used for the stability analysis; comparisons of the limit cycles, spectrograms and the modal contributions of unstable modes are undertaken for the transient responses; patterns of the acoustic intensity are computed on several observations surfaces and a decomposition based on the theory of 2D wavelets is introduced and applied to assess the convergence of patterns
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Гуменюк, Ігор Анатолійович. "Триботехнічні властивості сталі 12Х18Н10Т, поверхнево модифікованої комбінованими покриттями". Thesis, Національний авіаційний університет, 2018. http://er.nau.edu.ua/handle/NAU/36124.
Повний текст джерелаАнотація:
Гуменюк І.А. Триботехнічні властивості сталі 12Х18Н10Т, поверхнево модифікованої комбінованими покриттями. – На правах рукопису.
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю: 05.02.04 – тертя та зношування в машинах (13 – Механічна інженерія). Національний авіаційний університет, МОН України, Київ, 2018.
Дисертаційна робота присвячена вирішенню актуального науково-технічного завдання підвищення зносостійкості поверхневих шарів корозійностійкої сталі 12Х18Н10Т шляхом формування зносостійких комбінованих дифузійних, електроіскрових та композиційних електролітичних покриттів дискретного і градієнтного типу та встановлення закономірностей впливу їх структурно-фазового складу, фізико-механічних властивостей і параметрів структури на триботехнічні характеристики.
Дослідженні закономірності формування та механізми зношування багатокомпонентного хромоалітованого покриття в умовах тертя ковзання без змащення в залежності від хімічного і структурно-фазового складу.
Представлено та описано результати експериментальних досліджень технологічного процесу азотування попередньо обробленої дискретно лазером сталі 12Х18Н10Т. Встановлено закономірності зношування від параметрів дискретної структури.
Досліджено закономірності формування високотемпературним відпалом триботехнічних властивостей електроіскрових і композиційних електролітичних покриттів з евтектичним наповнювачем від ступеня нерівноважності структурно-фазових станів.
Теоретично обґрунтовано та експериментально підтверджено вплив дифузійної перехідної зони між твердим наповнювачем і м’якою матрицею на напружено-деформований стан та зносостійкість композиційних електролітичних покриттів.
На основі енергетичної моделі трибопроцесу виконано аналітичне дослідження умов утворення частинок зносу в процесі фрикційного руйнування приповерхневих шарів композиційного покриття.
Застосовуючи енергетичний підхід до оцінювання зносостійкості поверхневих шарів за умов їх руйнування при терті розроблено технологічний процес формування на сталі 12Х18Н10Т градієнтного покриття з високою припрацьовуваністю і зносостійкістю. Проведено статистичний аналіз та побудовано регресійні моделі залежностей критеріїв оптимізації.<br>Gumenyuk I.A. Tribotechnical properties of steel 12C-18Cr-10Ni-Тi, surface-modified by combined coatings. – Manuscript.
Thesis intended for getting scientific degree of Candidate of technical science by specialty: 05.02.04 – Friction and wear in machines (131 – Mechanical Engineering). National Aviation University, Ministry of Education and Science of Ukraine, Kyiv, 2018.
The thesis is devoted to solving the actual scientific and technical task of increasing the wear resistance of surface layers of corrosion–resistant steel 12C-18Cr-10Ni-Тi by forming wear resistant combined diffusion, electrospray and composite electrolytic coatings of discrete and gradient type and establishing regularities of influence of their structural-phase composition, physical and mechanical properties and structural parameters on tribotechnical behavior.
Investigation of regularities of formation and mechanisms of wear of multi-component chromoalluminized coating in conditions of dry sliding friction, depending on the chemical and structural-phase composition have been done.
The results of experimental examinations of technological process of nitriding of selectively laser pre-treated steel 12C-18Cr-10Ni-Тi are presented and described. The regularities of wear on parameters of a discrete structure have been established.
The regularities of formation of tribotechnical properties of electrospray and composite electrolytic coatings with eutectic filler by high-temperature annealing on the degree of nonequilibrim of structural-phase states were studied.
The influence of the diffusion transition zone between the solid filler and the soft matrix on the stress-strain state and the wear resistance of composite electrolytic coatings was theoretically proved and experimentally confirmed.
Based on the energy model of triboprocess, an analytical study of conditions for the formation of wear particles in the process of frictional destruction of near-surface layers of composite coating was carried out.
Using the energy approach to evaluation of wear-resistance of surface layers in conditions of their fracture at friction, a technological process of forming gradient coating on the surface of 12C-18Cr-10Ni-Тi steel with high workability and wear resistance was developed. A statistical analysis was carried out. Regression models of dependencies of optimization criteria were constructed.
Частини книг з теми "Friction-induced structures"
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Pires, Ingrid, Bruno C. Cayres, Djenane C. Pamplona, and Hans I. Weber. "Torsional Friction-Induced Vibrations in Slender Rotating Structures." In Advances in Mechanism and Machine Science. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20131-9_340.
Повний текст джерела
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Popp, K., and P. Stelter. "Nonlinear Oscillations of Structures Induced by Dry Friction." In Nonlinear Dynamics in Engineering Systems. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-83578-0_29.
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Lawal, Iyabo G., Michael R. Haberman, and Keegan J. Moore. "Simulating Nonlinear Beating Phenomena Induced by Dry Friction in Dynamic Systems." In Nonlinear Structures & Systems, Volume 1. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-36999-5_12.
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Jiang, Hao, Wu Liu, Jin Cheng, Huayan Yao, Renjie Li, and Jinhang Shang. "Numerical Analysis of Large-Diameter Shield Tunneling Disturbance Considering Stratum Strength Anisotropy." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-5814-2_45.
Повний текст джерелаАнотація:
AbstractThe anisotropic characteristics of natural strata could have a significant effect on the tunneling disturbance of shield tunnels. A shield tunneling disturbance simulation method considering the effect of stratum strength anisotropy is proposed in this study. The proposed method adopts the microstructure tensor theory to characterize the anisotropy effects of the stratum material cohesion c and the internal friction angle φ, and finely simulates the shield tunneling processes, including the shield shell advancement, the lining installation, and the shield tail grouting. The shield tunneling refined simulation method is validated by simulating the tunneling process in a certain section of a super-large-diameter shield tunnel in Wuhu City, Anhui Province, China, with good agreement between the simulated surface settlements on the axial and transverse profiles of the excavated tunnel after tunneling to different lining-ring numbers and the monitoring data. On this basis, according to the anisotropic compression strength property of the layered stratum in other sections, the effect of the stratum shear strength anisotropy on the shield tunneling disturbance is analyzed. The shield tunneling-induced surface settlement under the case considering stratum shear strength parameters anisotropy is obviously greater than that without accounting for the anisotropy, demonstrating the importance of considering strata anisotropy caused by geological structures during shield tunneling disturbance modeling.
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Wong, C. W., Y. Zhou, Y. Z. Li, and B. F. Zhang. "Skin Friction Drag Reduction Based on Plasma-Induced Streamwise Vortices." In Fluid-Structure-Sound Interactions and Control. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-48868-3_22.
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Eliseev, Alexander A., Tatiana A. Kalashnikova, Andrey V. Filippov, and Evgeny A. Kolubaev. "Material Transfer by Friction Stir Processing." In Springer Tracts in Mechanical Engineering. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_8.
Повний текст джерелаАнотація:
AbstractMechanical surface hardening processes have long been of interest to science and technology. Today, surface modification technologies have reached a new level. One of them is friction stir processing that refines the grain structure of the material to a submicrocrystalline state. Previously, the severe plastic deformation occurring during processing was mainly described from the standpoint of temperature and deformation, because the process is primarily thermomechanical. Modeling of friction stir welding and processing predicted well the heat generation in a quasi-liquid medium. However, the friction stir process takes place in the solid phase, and therefore the mass transfer issues remained unresolved. The present work develops the concept of adhesive-cohesive mass transfer during which the rotating tool entrains the material due to adhesion, builds up a transfer layer due to cohesion, and then leaves it behind. Thus, the transfer layer thickness is a clear criterion for the mass transfer effectiveness. Here we investigate the effect of the load on the transfer layer and analyze it from the viewpoint of the friction coefficient and heat generation. It is shown that the transfer layer thickness increases with increasing load, reaches a maximum, and then decreases. In so doing, the average moment on the tool and the temperature constantly grow, while the friction coefficient decreases. This means that the mass transfer cannot be fully described in terms of temperature and strain. The given load dependence of the transfer layer thickness is explained by an increase in the cohesion forces with increasing load, and then by a decrease in cohesion due to material overheating. The maximum transfer layer thickness is equal to the feed to rotation rate ratio and is observed at the axial load that causes a stress close to the yield point of the material. Additional plasticization of the material resulting from the acoustoplastic effect induced by ultrasonic treatment slightly reduces the transfer layer thickness, but has almost no effect on the moment, friction coefficient, and temperature. The surface roughness of the processed material is found to have a similar load dependence.
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Shaikh, Mohammad Yasir Mohammad Hasan, and Sourav Gur. "Underground Blast Induced Vibration Control of Building Isolated with Shape Memory Alloy Friction Pendulum." In Recent Developments in Structural Engineering, Volume 1. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-9625-4_12.
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Sinning, Hans-Rainer, and Norbert Matz. "Crystallization and Structural Transformations in Cozr2 Studied by Hydrogen-Induced Internal Friction." In Ordering and Disordering in Alloys. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2886-5_38.
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Denimal, E., L. Nechak, J. J. Sinou, and S. Nacivet. "A New Surrogate Modeling Method Associating Generalized Polynomial Chaos Expansion and Kriging for Mechanical Systems Subjected to Friction-Induced Vibration." In Special Topics in Structural Dynamics, Volume 6. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53841-9_2.
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"Fundamentals: The Tensor Structures Induced by Contact Friction." In Granular Geomaterials Dissipative Mechanics. John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119476887.ch1.
Повний текст джерелаТези доповідей конференцій з теми "Friction-induced structures"
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Wang, H., B. Brown, S. Nesic, and A. Pailleret. "In Situ Atomic Force Microscopy Study of Microstructure Dependent Inhibitor Adsorption Mechanism on Carbon Steel." In CONFERENCE 2022. AMPP, 2022. https://doi.org/10.5006/c2022-17739.
Повний текст джерелаАнотація:
ABSTRACT Organic surfactant-type corrosion inhibitors are widely applied in the oil and gas industry considering their high efficiency at low ppm concentrations. The investigation of organic inhibitor adsorption and inhibition mechanisms on carbon steel has been limited by the difficulties with surface characterization techniques at a molecular level. Atomic force microscopy (AFM) can provide localized visual observation, and can also achieve characterization of mechanical properties of an inhibitor film, through friction and surface stiffness measurements in multiple operational modes. Reported research has systematically studied the frictional properties of self-assembled surfactant monolayers on mica using lateral force microscopy. However, there has been no such studies done on carbon steels. In the work reported herein, in situ AFM topography measurements in contact mode, in situ AFM friction imaging and in situ AFM phase imaging techniques have been applied to investigate the influence of different microstructures present in a ferritic-pearlitic carbon steel on inhibitor adsorption mechanisms as well as corrosion inhibition of CO2 corrosion. AFM c friction images show a large friction contrast between inhibitor covered cementite structures and ferrite structures, while in the absence of inhibitor this friction contrast almost disappears, indicating the inhibitor adsorption induced this difference. AFM phase images indicate no preferential adsorption of inhibitor on cementite or ferrite structures. These results indicate that either the adhesion force of inhibitor molecules on the cementite structures could be much smaller than on ferrite structures, or the molecular orientations of inhibitor molecules adsorbed on the cementite and ferrite structures could be different. In either case, it is hypothesized that the carbide component of the steel microstructure directly influences inhibitor adsorption, which could decrease inhibitor efficiency in ferritic/pearlitic regions and areas where iron carbide is more prevalent.
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Barone, Stefano. "Italian Perspectives on Seismic Retrofitting: Unraveling the State of the Art in Building Isolation Techniques." In IABSE Congress, San José 2024: Beyond Structural Engineering in a Changing World. International Association for Bridge and Structural Engineering (IABSE), 2024. https://doi.org/10.2749/sanjose.2024.0386.
Повний текст джерелаАнотація:
<p>The seismic retrofit of existing buildings stands as a proven and vital strategy in mitigating earthquake-induced damage. This method centers around the strategic integration of anti-seismic devices at the building's base to effectively decouple ground motion from the structure. Particularly crucial for existing structures, this retrofit strategy addresses the unique challenges posed by older buildings and ensures enhanced resilience against seismic events. These anti-seismic devices are characterized by their high vertical stiffness, substantial horizontal flexibility, and medium to high dissipative capacity. Italy is among the world's most advanced countries in the widespread implementation of seismic isolation in existing buildings. This article indeed describes recent applications of this technology in buildings with completely different purposes: from private condominiums to school buildings, from healthcare facilities to agricultural structures. Various types of anti-seismic devices (rubber and friction isolators) are presented with a particular focus on experimental response. Finally, the article offers detailed insights into the various construction activities necessary for installing these devices, particularly in the context of reinforced concrete and masonry structures.</p>
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Porcher, G., and E. de Langre. "A Friction-Based Model for Fluidelastic Forces Induced by Axial Flow." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0098.
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Abstract Self excitations of slender structures under axial flow have been reported in a large variety of local flow configurations. This paper reports on the analytical results of a research program aimed at studying basic phenomena leading to fluidelastic instabilities. A friction-based model is proposed to calculate the fluidelastic forces induced by axial flow. It is developed here for an axial flow between two surfaces. This method is an extension of the studies which were carried out by Miller (1970), Hobson (1982) and Mulcahy (1988). A pressure drop is introduced in the system with a local or continuous pressure drop factor. This model is based on a modal analysis and is presented for structures with several degrees-of-freedom. The continuity and momentum equations are integrated along the fluid domain thickness with the boundary conditions on the structure. A linearization of these equations gives the expression of the fluctuating velocity and pressure. With a modal analysis, the fluidelastic force expression is obtained by the integration of the pressure on the structure wall. Three terms, called added terms, are identified: inertial, damping and stiffness. For several cases and different locations of the pressure drop, the behavior of this system and the flutter instability are analysed.
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Meliani, Hasnaa, Mohamed Assoul, Michaël Fontaine, Guy Monteil, and Vahan Malkhasyan. "The effect of Laser Induced Periodic Surface Structures on Wear and Friction Coefficient." In Frontiers in Optics. OSA, 2017. http://dx.doi.org/10.1364/fio.2017.jtu3a.34.
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Ingole, Sudeep, and Hong Liang. "Friction-Induced Phase Transformations of Cu-Al During Severe Wear." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63690.
Повний текст джерелаАнотація:
Surface modification and performance depend largely on the properties of surface atoms and structures. Fundamental investigation of friction was conducted in a Cu-Al sliding system. Deformation, wear, and transfer were studied. Detailed study was focused on friction-induced phase transformations. Surface characterization was carried out using an atomic force microscope (AFM). The debris analysis was done using a transmission electron microscope (TEM). Results showed that debris formed during sliding were amorphous. On the wear track, there is indication of surface melting and hardening. This presentation will discuss wear mechanisms involved in oxidation and property-performance of metallic materials.
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Luo, Albert C. J., and Tingting Mao. "On Motion Switchability in a Two Degree of Freedom, Friction-Induced Oscillator Traveling on Constant Speed Belts." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11473.
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In this paper, all possible stick and non-stick motions in such a friction-induced oscillator are discussed and the corresponding analytical conditions for the stick and non-stick motions to the traveling belts are presented. The mapping structures are introduced and the periodic motions of the two oscillators are presented through the corresponding mapping structure. Velocity and force responses for stick and non-stick, periodic motions in the 2-DOF friction-induced system are illustrated for a better understanding of the motion complexity in such many degrees of freedom systems.
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Prasad, S. V., J. R. Michael, C. Battaile, P. G. Kotula, and B. S. Majumdar. "On the Evolution of Friction-Induced Nanostructures in Single Crystal Nickel." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63577.
Повний текст джерелаАнотація:
We have investigated the fundamental phenomena governing the friction-induced microstructures in single crystal nickel. Friction measurements were made using a unidirectional linear wear tester against a hard Si3N4 ball so that deformation is confined to the softer Ni surface. To minimize the environmental effects on friction, we conducted the experiments in dry nitrogen atmosphere. A high precision rotary stage was designed and built to enable friction measurements to be made in specific crystallographic directions. Measurements were made on (100), (110) and (111) crystal faces. Focused ion beam (FIB) microscopy was used to prepare cross-sections of wear scars suitable for electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) analyses. The EBSD data revealed the formation of low-angle grain boundaries leading to the development of fine-grained equiaxed recrystallized substructues underneath the wear scars. The extent of subsurface deformation and the steady state friction coefficients were strongly dependent on the crystal orientation. At higher contact stresses, TEM analysis confirmed the formation of fine-grained equiaxed nanocrystalline grain structures. Subsequent friction tests on these nanostructured layers performed at much reduced contact stresses showed significant reductions in the friction coefficients. The role of the friction-induced nanostructures on the mechanisms of metallic friction is discussed.
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Yang, Chaozhen, Fuming Kuang, Ting Wang, and Meixia Chen. "Friction-Induced Vibration and Noise in Water-Lubricated Stern Bearings: A Comprehensive Review of Mechanisms and Design." In ASME 2024 43rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/omae2024-126464.
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Abstract Water-lubricated stern bearings are critical components of marine propulsion systems, influencing ship stability under extreme conditions such as low speed and heavy load. The acoustic stealth performance of underwater vehicles is closely tied to the friction-induced vibration and noise of the bearing system. Extensive research has been conducted to investigate the underlying mechanisms of these phenomena and explore novel materials and structural designs to address them. However, a complete resolution has yet to be achieved. While a significant portion of scholarly attention is dedicated to the design of novel bearing materials, encompassing ceramic, modified rubber, and polymer bearings, and innovative bearing structures such as micro-texture, honeycomb, and flume structures, there exists a critical gap in our understanding of the intricate relationship between nonlinear vibrations induced by friction lubrication and the resultant effects on shafting and overall ship vibration. Further research is warranted to unravel the nuanced connections between these elements, fostering a more comprehensive comprehension of bearing dynamics in the context of ship performance. This paper presents a comprehensive review that encompasses the generation mechanisms of friction-induced vibration and noise in water-lubricated stern bearings, along with an analysis of innovative structural design schemes and control strategies aimed at minimizing noise. The limitations of existing technologies are summarized, and potential future trends are identified, establishing a robust theoretical foundation for optimizing water-lubricated bearings and developing “silent” water-lubricated stern tube bearings.
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Reuss, Pascal, Jens Becker, and Lothar Gaul. "Efficient Damping Prediction of Bolted Structures Using Harmonic Balance Method." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71140.
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In this paper damping induced by extensive friction occurring in the interface between bolted structures is considered by simulations and experiments. A friction damper is attached to a beam-like flexible structure by screws such that the normal force in the interface can be varied by the clamping force of the screws. Contact and friction force parameters are identified by the comparison of simulated and experimentally determined FRFs for a particular normal force. Afterward a prediction of damping for different configurations is established. For simulations a finite element model is used where suitable contact and friction models are implemented. A time simulation of the system is expensive due to the large number of DoFs of the discretized substructures and the required small step size due to the high contact stiffness. Therefore model reduction methods are used. A further reduction of the computation time can be achieved by using the Harmonic Balance Method (HBM) for a direct frequency domain computation of FRFs. This enables an efficient procedure to approximate the reachable damping as well as to search the optimal damper position and the optimal normal force. The dependency of the friction to the vibration amplitude is therefore taken into account. A more detailed investigation of the nonlinear effects, e.g. higher harmonic response, is then accomplished by transient simulations for the optimal configured system in the time domain and the results are compared to experimental results.
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Petrov, E. P. "Analysis of Flutter-Induced Limit Cycle Oscillations in Gas-Turbine Structures With Friction, Gap and Other Nonlinear Contact Interfaces." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-46188.
Повний текст джерелаАнотація:
A frequency-domain method has been developed to predict and comprehensively analyse the limit-cycle flutter-induced vibrations in bladed discs and other structures with nonlinear contact interfaces. The method allows, for the first time, direct calculation of the limit-cycle amplitudes and frequencies as functions of contact interface parameters and aerodynamic characteristics using realistic large-scale finite element models of structures. The effects of the parameters of nonlinear contact interfaces on limit-cycle amplitudes and frequencies have been explored for major types of nonlinearities occurring in gasturbine structures. New mechanisms of limiting the flutter-induced vibrations have been revealed and explained.