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Fretting Et Fretting Fatigue A Haute Temperature Dalliages De Titane Revetus
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Book Synopsis Fretting et fretting-fatigue à haute température d'alliages de titane revêtus by : Benjamin Van Peteghem
Download or read book Fretting et fretting-fatigue à haute température d'alliages de titane revêtus written by Benjamin Van Peteghem and published by . This book was released on 2013 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les endommagements provoqués par le fretting sont multiples et peuvent causer de sévères disfonctionnements. Il est donc nécessaire d’étudier le fretting, en particulier dans le cas des alliages de titanes fréquemment employés dans l’aéronautique. Les endommagements générés par fretting peuvent être de l’usure, de la fissuration ou bien une combinaison des deux. La distinction entre ces deux comportements entraine régulièrement une dichotomie dans le choix des sujets traités. L’étude présentée ici fait le choix de rassembler en une seule démarche les études d’usure et de fissuration. Cette approche permet d’avoir une vision d’ensemble du comportement en fretting et fretting-fatigue d’un contact aube-disque dans un compresseur haute pression. Afin de respecter les contraintes industrielles, l’étude est réalisée à haute température (450°C) avec un contact plan sur plan revêtu. Pour réaliser cette étude, un dispositif expérimental original a été mis en place et validé. Les premiers résultats tribologiques montrent un effet majeur de la pression de contact sur le comportement tribologique de l’interface. Le coefficient de frottement du traitement de surface étudié diminue quand la pression de contact augmente. Une hypothèse d’expulsion du lubrifiant solide inclus dans le dépôt est proposée pour expliquer ce phénomène. Les résultats d’usure et notamment les analyses physicochimiques montrent un comportement sacrificiel du dépôt qui est usé préférentiellement au contre-corps. Cette caractéristique est bénéfique car dans l’application industrielle le contre-corps (le disque) doit être protégé en priorité par rapport à la pièce revêtue (l’aube). Les résultats d’usure dans la configuration industrielle sont complétés par une étude plus fondamentale mettant en évidence l’influence de la fréquence et du cycle de chargement du contact. La morphologie des traces d’usure est modifiée par ces deux facteurs, et le taux d’usure énergétique est également modifié. L’étude de la fissuration est menée en fretting simple et en fretting-fatigue. La fissuration du contre-corps non revêtu est modifiée par l’application d’un dépôt sur le poinçon revêtu. L’effet est principalement observable sur la longueur maximale de fissure, qui est divisée par deux dans le cas revêtu. Les résultats en fretting-fatigue sont également modifiés par la présence du revêtement, dont l’effet est plus présent pour les grands nombre de cycles. Enfin, une représentation des résultats sous forme de diagramme polaire normalisé est proposée afin de donner une image claire de l’ensemble des performances du dépôt.
Book Synopsis High Temperature Fretting Fatigue of Nickel and Titanium Alloys by : Muhammad Mahmud Hamdy
Download or read book High Temperature Fretting Fatigue of Nickel and Titanium Alloys written by Muhammad Mahmud Hamdy and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fretting Fatigue Behavior of a Titanium Alloy Ti-6AL-4V at Elevated Temperature by : Onder Sahan
Download or read book Fretting Fatigue Behavior of a Titanium Alloy Ti-6AL-4V at Elevated Temperature written by Onder Sahan and published by . This book was released on 2002-03-01 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this research is to investigate the fretting fatigue behavior of the titanium alloy Ti-6Al-4V at elevated temperature is investigated. Fretting and plain fatigue experiments are conducted at 260 . Crack initiation location and crack initiation orientation is measured and fretting and plain fatigue life data of the specimens from these tests are obtained. Fatigue parameters capable of predicting the number of cycles to specimen failure, the crack location and the crack orientation along the contact surface are analyzed. The parameters are calculated by using the computed stresses and strains obtained from the finite element analysis. The mechanisms responsible for the fretting fatigue crack initiation are determined. The effect of elevated temperature is examined by comparing room and elevated temperature fretting and plain fatigue data.
Book Synopsis Notched Fatigue and Fretting Fatigue Life of Textured Titanium by : Anthone Zarkades
Download or read book Notched Fatigue and Fretting Fatigue Life of Textured Titanium written by Anthone Zarkades and published by . This book was released on 1981 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of texture, (0002) poles in the transverse direction, on the notched and fretting fatigue life of a Ti-4Al-4V alloy was examined. Notched fatigue and pin-loaded flat fretting fatigue specimens were tested at room temperature in the longitudinal and transverse directions and compared to smooth bar fatigue results. Fractured fretting fatigue specimens were examined with the scanning electron microscope. Indications are that no fretting or notch fatigue anisotropy exists for the transverse type texture and specimen orientations examined. However, as expected, a significant reduction of the fatigue life is displayed for specimens subjected to fretting fatigue. (Author).
Book Synopsis High Temperature Fretting Fatigue Behavior in an XDTM ?-base TiAl by : B. Pettersson
Download or read book High Temperature Fretting Fatigue Behavior in an XDTM ?-base TiAl written by B. Pettersson and published by . This book was released on 2000 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The plain and fretting fatigue behavior was studied of a ?-base TiAl intermetallics at 675°C in air. he TiAl material was produced by the XDTM process and had a nominal composition of Ti-47Al-2Nb-2Mn+0.8vol%TiB2. The contact material was Inconel 718. The reduction of fatigue strength by fretting was very small (around 20%) compared to metallic materials (3060%). The plain and fretting fatigue S-N curves were flat, which resembled the behavior of ceramic materials. The flat S-N curves are corresponding to the very steep crack growth curve reported for TiAl-based materials containing TiB2. A fretting fatigue crack nucleated in the very late stage of fatigue life (later than 0.75Nf), while it is known to nucleate in the very early stage of fatigue life (less than few percent of Nf) for steels. The fatigue lifetimes of this material were suggested to be determined by the cycles needed for nucleation of a crack rather than by crack propagation.
Book Synopsis Fretting Fatigue Characteristics of Titanium Alloy Ti-6Al-4V in Ultra High Cycle Regime by : S. Shirai
Download or read book Fretting Fatigue Characteristics of Titanium Alloy Ti-6Al-4V in Ultra High Cycle Regime written by S. Shirai and published by . This book was released on 2003 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the present study, fretting fatigue behavior of a Ti-6Al-4V alloy under high stress ratios in the ultra high cycle regime (up to 109 cycles) has been investigated. The slope of S-N curve decreased with increasing stress ratio. The slope was steeper in short fatigue life region and became flatter in longer life region. The test results under various stress ratios followed the modified Goodman diagram for both the fatigue strengths defined at 107 cycles and 108 cycles. The so-called non-propagating cracks, which were often observed in steels and aluminum alloys, could not be found in the run-out specimens tested up to 107 cycles. In the further loading cycles up to 109 cycles at the same stress amplitude, no crack initiation and propagation could be observed, which indicated that the conventional fretting fatigue strength defined 107 cycles was still effective at least up to 109 cycles. Different behavior between the titanium alloy used and the other materials mainly results from the different crack initiation behavior.
Book Synopsis Fretting Fatigue Strength of Titanium Alloy RC 130B by : H. W. Liu
Download or read book Fretting Fatigue Strength of Titanium Alloy RC 130B written by H. W. Liu and published by . This book was released on 1956 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
