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Fatigue De Composites A Matrice Metallique Base Titane A Renfort Unidirectionnel De Fibres Sic
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Book Synopsis Fatigue de composites à matrice métallique base titane à renfort unidirectionnel de fibres SiC by : Nicolas Legrand
Download or read book Fatigue de composites à matrice métallique base titane à renfort unidirectionnel de fibres SiC written by Nicolas Legrand and published by . This book was released on 1997 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail a essayé de comprendre l'origine physique de la rupture en fatigue à haute température des composites à matrice métallique SCS6/TA6V, SM1140+/Ti6242 et SCS6/Ti6242. Le comportement en fatigue du matériau a été étudié selon deux orientations : longitudinale (axe de chargement parallèle à l'axe des fibres) et transversale (axe de sollicitation perpendiculaire à l'axe des fibres). En fatigue longitudinale, effectuée à 450 et 550°C sur le SCS6/TA6V, trois processus majeurs d'endommagement ont été identifiés : le report de charge global de la matrice aux fibres lié à son adoucissement cyclique, la dégradation locale des interfaces au droit des ruptures de fibres et la dégradation des propriétés à rupture du renfort par l'environnement. Les cinétiques d'endommagement de ces différents mécanismes ont pu être évaluées grâce à des observations et à l'émission acoustique. Un modèle micromécanique, prenant en compte le comportement statistique des fibres, a alors permis de confirmer et de quantifier l'influence de ces trois mécanismes d'endommagement sur la rupture en fatigue de composite. Il a ainsi été montré qu'à des niveaux de sollicitation suffisamment élevés (contrainte supérieure à 1000MPa), la dégradation locale des interfaces au droit des ruptures de fibres peut conditionner à elle seule la durée de vie en fatigue du composite. Enfin, en se basant sur les résultats expérimentaux d'émission acoustique, le modèle a permis, au moins semi quantitativement, d'être prédictif en cinétique d'endommagement et en rupture.
Book Synopsis Fatigue in SiC Fibre Reinforced Titanium Metal Matrix Composites by : Matthew Nicholas Dear
Download or read book Fatigue in SiC Fibre Reinforced Titanium Metal Matrix Composites written by Matthew Nicholas Dear and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Thermomechanical Fatigue of Unidirectional Titanium Metal Matrix Composites by : YA. Bahei-El-Din
Download or read book Analysis of Thermomechanical Fatigue of Unidirectional Titanium Metal Matrix Composites written by YA. Bahei-El-Din and published by . This book was released on 1993 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermomechanical fatigue (TMF) data have been generated for a Ti-15V-3Cr-3Al-3Sn (Ti-15-3) material reinforced with SCS-6 silicon carbide fibers for both in-phase and out-of-phase testing. Significant differences in failure mechanisms and fatigue life are noted for the in-phase and out-of-phase testing. The purpose of the research reported in this paper is to apply a micromechanics model to analysis of the data. The analysis predicts the stresses in the fiber and in the matrix material during the thermal and mechanical cycling by calculating both the thermal and mechanical stresses and their time-dependent behavior. The rate-dependent behavior of the matrix was characterized and was used to calculate the constituent stresses in the composite. The predicted 0° fiber stress range was used to explain the composite failure. It was found that for a given condition, temperature, loading frequency, and time at temperature, the 0° fiber stress range may control the fatigue life of the unidirectional composite.
Book Synopsis Fracture and Fatigue of Selectively Continuous Silicon Carbide Fibre Reinforced Titanium Metal Matrix Composites for Advanced Aerospace Applications by : Supachai Fakpiam
Download or read book Fracture and Fatigue of Selectively Continuous Silicon Carbide Fibre Reinforced Titanium Metal Matrix Composites for Advanced Aerospace Applications written by Supachai Fakpiam and published by . This book was released on 2005 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comportement en fatigue anisotherme des composites unidirectionnels à matrice titane renforcée par des fibres de carbure de silicium by : Faten Bourbita
Download or read book Comportement en fatigue anisotherme des composites unidirectionnels à matrice titane renforcée par des fibres de carbure de silicium written by Faten Bourbita and published by . This book was released on 2011 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'objectif de cette étude est de déterminer la tenue du composite SCS-6/Ti6242, alliage de titane avec un renfort unidirectionnel de fibres SiC, pour des applications à température moyenne notamment pour des pièces critiques de moteurs aéronautiques, sous sollicitations thermiques et mécaniques combinées. Les conditions de chargement en service sont simulées en laboratoire par des essais de fatigue mécano-thermique, réalisés dans la plage de températures 100°C - 450°C, en contrainte imposée, sous un rapport de charge nul. Les observations des faciès de rupture réalisées par microscopie optique et électronique à balayage ont montré l'existence de deux mécanismes d'endommagement : la rupture des fibres comme en rupture monotone et la fissuration de la matrice par fatigue. Une analyse par éléments finis a été mise en place pour étudier le comportement mécanique du composite, à partir d'une méthode d'homogénéisation et du comportement de ses constituants. Les calculs montrent l'importance de la redistribution des contraintes entre les fibres et la matrice. Les résultats sont utilisés pour expliquer les mécanismes d'endommagement observés et les conséquences sur la prévision des durées de vie en fatigue anisotherme. La croissance de fissures longues en conditions anisotherme et isotherme a fait l'objet d'une étude expérimentale. Une analyse de mécanique de la rupture recourant à une méthode de zone cohésive a permis de rationaliser les vitesses fissuration observées.
Book Synopsis Fatigue Damage Growth Mechanisms in Continuous Fiber Reinforced Titanium Matrix Composites by :
Download or read book Fatigue Damage Growth Mechanisms in Continuous Fiber Reinforced Titanium Matrix Composites written by and published by . This book was released on 1990 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fracture and Fatigue of SiC Fibre Reinforced Titanium Matrix Laminated Composites by : Figen Kaya
Download or read book Fracture and Fatigue of SiC Fibre Reinforced Titanium Matrix Laminated Composites written by Figen Kaya and published by . This book was released on 1999 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Behavior of SiC Reinforced Titanium Composites by : R.T. Bhatt
Download or read book Fatigue Behavior of SiC Reinforced Titanium Composites written by R.T. Bhatt and published by . This book was released on 1979 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The low cycle axial fatigue properties of 25 and 44 fiber volume percent SiC/Ti(6Al-4V) composites were measured at room temperature and at 650 C. At room temperature, the S-N curves for the composites showed no anticipated improvement over bulk matrix behavior. Although axial and transverse tensile strength results suggest a degradation in SiC fiber strength during composite fabrication, it appears that the poor fatigue life of the composites was caused by a reduced fatigue resistance of the reinforced Ti(6Al-4V) matrix. Microstructural studies indicate that the reduced matrix behavior was due, in part, to the presence of flawed and fractured fibers created near the specimen surfaces by preparation techniques. Another possible contributing factor is the large residual tensile stresses that can exist in fiber-reinforced matrices. These effects, as well as the effects of fatigue testing at high temperature, are discussed.
Book Synopsis Fatigue Damage Evolution and Degradation of Mechanical Properties in Silicon-Carbide (SiC) Fiber-Reinforced Titanium Matrix Composites by : SM. Jeng
Download or read book Fatigue Damage Evolution and Degradation of Mechanical Properties in Silicon-Carbide (SiC) Fiber-Reinforced Titanium Matrix Composites written by SM. Jeng and published by . This book was released on 1996 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue damage accumulation and failure modes of several unidirectional and angle-ply SCS-6 fiber-reinforced titanium matrix composites are reviewed. The fatigue damage characteristics of the notched and unnotched composites were classified using several schematic diagrams based upon the constituent's properties and loading conditions. Quantitative relationships between the microstructural damage and stiffness reduction were also established. A shear-lag model incorporating a damage function (which involved the cracking density and length, fiber/matrix frictional stress, and debonding length) was also used to predict residual stiffness of the composites.
Book Synopsis Fiber Volume Fraction Effects on Fatigue Response of a SCS-6/Ti-15-3 Metal Matrix Composite at Elevated Temperature by : Sean C. Coghlan
Download or read book Fiber Volume Fraction Effects on Fatigue Response of a SCS-6/Ti-15-3 Metal Matrix Composite at Elevated Temperature written by Sean C. Coghlan and published by . This book was released on 1997-09-01 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to determine the effects of fiber volume fraction on the fatigue behavior of Silicon Carbide fiber-reinforced Titanium alloy, SCS-6/Ti-15-3. Three fiber volume fractions were investigated; 15%, 25%, and 42%. The tests were performed under fully-reversed, strain- controlled conditions at 427 C. The primary objectives of this study were to develop a fatigue life diagram and to document the damage and failure mechanisms. Compressive loads on the slender specimens were kept from buckling the specimens through the use of a buckling guide. This device allows unrestricted axial movement of the composite, while preventing any out-of-plane motion. No buckling damage due to compression was found in any of the specimens. Modulus behavior and stress versus strain curves were recorded during cycling for each test. An applied strain range between 0.5% and 1.1% was used for the majority of the tests. This resulted in fatigue lives between approximately 10, 000 and 100,000 cycles. The resulting fatigue life diagram showed similar life at strain ranges at and above 0.008 mm/mm for all fiber volume fractions. At strain levels below 0.008 mm/mm, there was an increasing fatigue life with increasing fiber volume fraction. The 15% and 42% V sub f material was consolidated with a molybdenum cross-weave to hold the fibers in alignment. The 25% V sub f material had a titanium-niobium cross-weave for the same purpose. The Mo cross-weave was present on every fracture surface of the 15% and 42% V sub f material. This indicated that it was detrimental to the fatigue life of the composite. No cross-weave material was found on the fracture surfaces of the 25% V sub f. Major cause of specimen failure was the initiation and propagation of fatigue cracks in the matrix that were perpendicular to the applied load.
Book Synopsis Fatigue Behavior of Silicon-Carbide Reinforced Titanium Composites by : RT. Bhatt
Download or read book Fatigue Behavior of Silicon-Carbide Reinforced Titanium Composites written by RT. Bhatt and published by . This book was released on 1981 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The low cycle axial fatigue properties of 25 and 44-fiber volume percent SiC/Ti(6Al-4V) composites were measured at room temperature and at 650°C. At room temperature, the S-N curves for the composites showed no anticipated improvement over bulk matrix behavior. Although axial and transverse tensile strength results suggest a degradation in silicon-carbide fiber strength during composite fabrication, it appears that the poor fatigue life of the composites was caused by a reduced fatigue resistance of the reinforced Ti(6Al-4V) matrix. Microstructural studies indicate that the reduced matrix behavior was due, in part, to the presence of flawed and fractured fibers created near the specimen surfaces by preparation techniques. Another possible contributing factor is the large residual tensile stresses that can exist in fiber-reinforced matrices. These effects as well as the effects of fatigue testing at high temperature are discussed.
Book Synopsis Fatigue Behavior of SiC Reinforced Titanium Composites by : R. T. Bhatt
Download or read book Fatigue Behavior of SiC Reinforced Titanium Composites written by R. T. Bhatt and published by . This book was released on 1979 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The low cycle axial fatigue properties of 25 and 44 fiber volume percent SiC/Ti(6Al-4V) composites were measured at room temperature and at 650 C. At room temperature, the S-N curves for the composites showed no anticipated improvement over bulk matrix behavior. Although axial and transverse tensile strength results suggest a degradation in SiC fiber strength during composite fabrication, it appears that the poor fatigue life of the composites was caused by a reduced fatigue resistance of the reinforced Ti(6Al-4V) matrix. Microstructural studies indicate that the reduced matrix behavior was due, in part, to the presence of flawed and fractured fibers created near the specimen surfaces by preparation techniques. Another possible contributing factor is the large residual tensile stresses that can exist in fiber-reinforced matrices. These effects, as well as the effects of fatigue testing at high temperature, are discussed.
Book Synopsis Analysis of Thermomechanical Fatigue of Unidirectional Titanium Metal Matrix Composites by :
Download or read book Analysis of Thermomechanical Fatigue of Unidirectional Titanium Metal Matrix Composites written by and published by . This book was released on 1991 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Response of Metal Matrix Composites by : R. Leucht
Download or read book Fatigue Response of Metal Matrix Composites written by R. Leucht and published by . This book was released on 1994 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are presented on the fatigue behavior of continuous fiber-reinforced aluminum and titanium alloys, both reinforced with SiC fibers. The pure aluminum matrix was reinforced with the "Tyranno" fiber of Ube, Japan, while the Ti6Al4V matrix was reinforced with the SCS-6 fiber of Textron. Also investigated was an Al-2.5Li alloy reinforced with ?-Al2O3 FP fiber from DuPont.
Book Synopsis Fatigue Damage Mechanisms of a Continuous Silicon Carbide (SiC) Fiber Reinforced Titanium Matrix Composite by : Ochang Jin
Download or read book Fatigue Damage Mechanisms of a Continuous Silicon Carbide (SiC) Fiber Reinforced Titanium Matrix Composite written by Ochang Jin and published by . This book was released on 1998 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Materiaux composites a matrice metallique by :
Download or read book Materiaux composites a matrice metallique written by and published by Ed. Techniques Ingénieur. This book was released on 1993 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Etude d'un composite à matrice métallique Al-SiC de fonderie by : Pierre Hottebart
Download or read book Etude d'un composite à matrice métallique Al-SiC de fonderie written by Pierre Hottebart and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: L'apparition recente des composites a matrice metallique alsic de fonderie a renforts discontinus ouvre de nouvelles perspectives, notamment pour l'industrie automobile. Le but de cette etude est la determination du comportement sous sollicitations cycliques ainsi que des mecanismes physiques d'endommagement et d'amorcage de fissures par fatigue, a temperature ambiante, d'un tel materiau. L'influence de l'etat de surface sur les proprietes mecaniques est egalement etudiee. Dans un premier temps, une etude bibliographique approfondie traite des aspects materiau et proprietes mecaniques des composites alsic a renforts discontinus. Dans un deuxieme temps, est plus particulierement etudie un composite a matrice aluminium renforce par 10 pour-cent de particules sic, compare a l'alliage non renforce. Une etude microstructurale permet de definir les conditions de traitement thermique t6 et met en evidence une microstructure resultante complexe. Des observations au microscope electronique a balayage montrent que l'endommagement en traction monotone consiste en la rupture de particules et en les decohesions a l'interface matrice/renfort. Le composite montre une grande sensibilite a l'etat de surface, et notamment a l'endommagement initial a l'etat usine. L'etude en fatigue oligocyclique du composite montre un durcissement cyclique plus important compare a celui de l'alliage non renforce. Le composite montre une resistance superieure dans le domaine de la fatigue endurance, mais moindre dans le domaine de la fatigue oligocyclique. A bas niveau de contrainte, l'endommagement du composite a lieu par decohesions matrice/renfort et par rupture et/ou decohesions precipites/matrice. A haut niveau de contrainte, la rupture des particules sic les plus grandes s'ajoute aux mecanismes intervenant a bas niveau. Les fissures se propagent de maniere privilegiee dans les espaces interdendritiques, ou se concentrent les particules sic et les nombreux precipites. A l'etat de surface brut de fonderie, les resistances a la fatigue du composite de l'alliage non renforce sont comparables, et nettement superieures a celles a l'etat de surface usiné-poli.
