Literatura científica selecionada sobre o tema "Tribologically Transformed Structure (TTS)"
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Artigos de revistas sobre o assunto "Tribologically Transformed Structure (TTS)"
Zhou, Z. R., E. Sauger, J. J. Liu e L. Vincent. "Nucleation and early growth of tribologically transformed structure (TTS) induced by fretting". Wear 212, n.º 1 (novembro de 1997): 50–58. http://dx.doi.org/10.1016/s0043-1648(97)00141-5.
Texto completo da fonteXin, Long, Yongming Han, Ligong Ling, Weidong Zhang, Yonghao Lu e Tetsuo Shoji. "The Evolution of Fretting Wear Behavior and Damage Mechanism in Alloy 690TT with Cycle Number". Materials 13, n.º 10 (25 de maio de 2020): 2417. http://dx.doi.org/10.3390/ma13102417.
Texto completo da fonteWang, Shengjie, e Magd Abdel Wahab. "A Numerical Study on the Effect of Variable Wear Coefficient on Fretting Wear Characteristics". Materials 14, n.º 8 (8 de abril de 2021): 1840. http://dx.doi.org/10.3390/ma14081840.
Texto completo da fonteMaestracci, R., N. Fabrègue, M. Jeandin, G. Bouvard, M. Messaadi, P. Kapsa, A. Sova, I. Movtchan, J. F. Coulon e J. M. Malhaire. "Study of Damage Mechanisms in Cold-Sprayed 316L-Matrix Composite Coatings Using Novel Impact-Sliding Testing". Advanced Materials Research 922 (maio de 2014): 452–62. http://dx.doi.org/10.4028/www.scientific.net/amr.922.452.
Texto completo da fonteSauger, E., S. Fouvry, L. Ponsonnet, Ph Kapsa, J. M. Martin e L. Vincent. "Tribologically transformed structure in fretting". Wear 245, n.º 1-2 (outubro de 2000): 39–52. http://dx.doi.org/10.1016/s0043-1648(00)00464-6.
Texto completo da fonteLanglade, C., A. Roman, D. Schlegel, E. Gete e M. Folea. "Formation of a Tribologically Transformed Surface (TTS) on AISI 1045 Steel by Friction Stir Processing". Materials and Manufacturing Processes 31, n.º 12 (29 de abril de 2016): 1565–72. http://dx.doi.org/10.1080/10426914.2015.1090584.
Texto completo da fonteSauger, E., L. Ponsonnet, J. M. Martin e L. Vincent. "Study of the tribologically transformed structure created during fretting tests". Tribology International 33, n.º 11 (novembro de 2000): 743–50. http://dx.doi.org/10.1016/s0301-679x(00)00088-8.
Texto completo da fonteSekkal, A. C., C. Langlade e A. B. Vannes. "Tribologically transformed structure of titanium alloy (TiAl6V4) in surface fatigue induced by repeated impacts". Materials Science and Engineering: A 393, n.º 1-2 (fevereiro de 2005): 140–46. http://dx.doi.org/10.1016/j.msea.2004.10.008.
Texto completo da fonteKirk, A. M., P. H. Shipway, W. Sun e C. J. Bennett. "The effect of frequency on both the debris and the development of the tribologically transformed structure during fretting wear of a high strength steel". Wear 426-427 (abril de 2019): 694–703. http://dx.doi.org/10.1016/j.wear.2018.12.035.
Texto completo da fonteLefranc, Vivien, Soha Baydoun, Camille Gandiolle, Eva Héripré, Maxime Vallet, Siegfried Fouvry e Véronique Aubin. "Heterogeneity in Tribologically Transformed Structures (TTS) of Ti-6Al-4V under fretting". Wear, março de 2023, 204680. http://dx.doi.org/10.1016/j.wear.2023.204680.
Texto completo da fonteTeses / dissertações sobre o assunto "Tribologically Transformed Structure (TTS)"
Lefranc, Vivien. "Etude des Transformations Tribologiques Superficielles de TA6V formées par fretting : mécanismes de création, propriétés micromécaniques et modélisation de l’usure". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST039.
Texto completo da fonteFretting is a surface degradation phenomenon occurring under low-amplitude alternating sliding. During fretting loading, superficial layers undergo microstructural transformations, appearing white after chemical etching, and become brittle. These layers are named Tribologically Transformed Structures (TTS) and contribute to debris formation. This research aims to understand the genesis of TTS in a plane-plane contact of Ti-Al-4V alloy subjected to fretting loading and to characterize their mechanical behavior.First, TTS formation was evaluated under various contact conditions, particularly by modifying the contact pressure. The kinetics of TTS formation are studied by analyzing the localization and morphology of TTS for different fretting cycle numbers. EDX chemical analyses, optical observations, and SEM of cross-sectional cuts of fretting scars after chemical etching are conducted. The results show that TTS initially appear locally as islands before forming a single, enlarged zone at the center of the contact with a thickness smaller than 100 microns. However, pressures inferior or equal to 200 MPa do not allow TTS to form, suggesting the establishment of a pressure threshold for their appearance in the contact.The second part of the study focuses on the characterization of the microstructure and crystallographic texture of TTS. Since TTS are nanograin materials, TEM analyses are needed to describe their structure. The phases are identified through electron diffraction patterns, while EDS and EELS chemical analyses are executed. The Astar method is employed to establish the local texture of TTS zones at a nanoscopic resolution. It emerges that TTS consist of two alternating layers of nanograins. One layer comprises larger alpha phase grains (20 to 50 nm) with a distinct crystallographic texture, while the other consists of smaller grains (also of the alpha phase) with a few nanometers in diameter and lacking an untextured. The presence of nitrogen is also detected in this layer. A mechanism of TTS formation by continuous dynamic recrystallization coupled with localization of plastic deformation into bands is introduced to explain the observed heterogeneous microstructure.The destruction of TTS is also a critical issue. However, the very low thickness of TTS (<100 microns) renders the determination of their mechanical characteristics challenging. Flexural tests of notched micro-cantilevers, machined and loaded in a SEM-FIB, were used to identify the fracture toughness of TTS and revealed their significant brittleness. Their heterogeneous microstructure also impacts the crack propagation path.Finally, a novel numerical approach has been implemented to estimate cumulative levels of plastic deformation within the contacts. This simulation is conducted in two stages. First, wear is simulated using a multiphysical model that takes into account surface oxidation phenomena. Then, an elasto-plastic calculation is performed on the worn surface to estimate the cumulative plastic deformation during fretting. These simulations confirm the appearance of TTS in the form of islands via a plastic process, highlighting the utility of simulations in explaining TTS formation
Tumbajoy, Spinel David. "Caractérisation du comportement mécanique de surfaces hyper-déformées par des phénomènes de contact". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEM025/document.
Texto completo da fonteThe mechanical surface treatments confer better local mechanical properties against wear or fatigue service conditions. In the case of impact-based treatments, the material is exposed to repeated mechanical loadings, producing a severe plastic deformation in the near-surface. It leads to a local and progressive refinement of the microstructure into the affected zone, commonly known as Tribologically Transformed Surface (TTS). For this project, two mechanical surface treatments are used in a model material (pure α-iron): (i) shot-peening and (ii) micro-percussion.The resulting surfaces are characterized by a mechanical property gradient in-depth as a consequence of the microstructural transformation over a few tens of microns. Nowadays, it is well-known that this rise of local mechanical properties could improve the service lifetime of materials. However, a simple micro-hardness test is not quite enough to quantify precisely the engendered variation of mechanical properties and understand the influence of several microstructural effects. For this purpose, two micro-mechanical tests are considered: (i) nano-indentation and (ii) in situ micro-pillar compression.The main issue of this work is to characterize the mechanically-induced transformed surfaces and correlate the mechanical properties gradients with the local microstructural evolutions. Indeed, three main goals are considered: (i) quantify the mechanical and microstructural gradients induced by the surface treatments (shot-peening and micro-percussion), (ii) correlate the results obtained by the means of both mechanical tests (nano-indentation and micro-pillar compression) and finally (iii) investigate the influence of several microstructural effects related with the graded strengthening of hyper-deformed surfaces