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Debut De Propagation De Fissures De Fatigue Dans Un Superalliage Base Nickel De Metallurgie Des Poudres
Download Debut De Propagation De Fissures De Fatigue Dans Un Superalliage Base Nickel De Metallurgie Des Poudres full books in PDF, epub, and Kindle. Read online Debut De Propagation De Fissures De Fatigue Dans Un Superalliage Base Nickel De Metallurgie Des Poudres ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Bachelet: high temp- erature mater by : E. Bachelet
Download or read book Bachelet: high temp- erature mater written by E. Bachelet and published by Springer Science & Business Media. This book was released on 1990-10-15 with total page 930 pages. Available in PDF, EPUB and Kindle. Book excerpt: Themes reflect the work carried out within the framework of COST-501 and of COST-505 the latter being concerned with materials for steam turbines and the first results of the concerted action COST-501/II 'High temperature materials for power engineering' initiated in 1988.
Book Synopsis Effect of Dwell-times on Crack Propagation in Superalloys by : Jonas Saarimäki
Download or read book Effect of Dwell-times on Crack Propagation in Superalloys written by Jonas Saarimäki and published by Linköping University Electronic Press. This book was released on 2015-12-10 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas turbines are widely used in industry for power generation and as a power source at "hard to reach" locations where other possibilities for electrical supply are insufficient. There is a strong need for greener energy, considering the effect that pollution has had on global warming, and we need to come up with ways of producing cleaner electricity. A way to achieve this is by increasing the combustion temperature in gas turbines. This increases the demand on the high temperature performance of the materials used e.g. superalloys in the turbine. These high combustion temperatures can lead to detrimental degradation of critical components. These components are commonly subjected to cyclic loading of different types e.g. combined with dwell-times and overloads at elevated temperatures, which influence the crack growth. Dwell-times have shown to accelerate crack growth and change the cracking behaviour in both Inconel 718 and Haynes 282. Overloads at the beginning of the dwell-time cycle have shown to retard the dwell time effect on crack growth in Inconel 718. To understand these effects more microstructural investigations are needed. The work presented in this licentiate thesis was conducted under the umbrella of the research program Turbo Power; "High temperature fatigue crack propagation in nickel-based superalloys", concentrating on fatigue crack growth mechanisms in superalloys during dwell-times, which have shown to have a devastating effect on the crack propagation behaviour. Mechanical testing was performed under operation-like conditions in order to achieve representative microstructures and material data for the subsequent microstructural work. The microstructures were microscopically investigated in a scanning electron microscope (SEM) using electron channeling contrast imaging (ECCI) as well as using light optical microscopy. The outcome of this work has shown that there is a significant increase in crack growth rate when dwell-times are introduced at the maximum load (0% overload) in the fatigue cycle. With the introduction of a dwell-time there is also a shift from transgranular to intergranular crack growth for both Inconel 718 and Haynes 282. When an overload is applied prior to the dwell-time, the crack growth rate decreases with increasing overload levels in Inconel 718. At high temperature crack growth in Inconel 718 took place as intergranular crack growth along grain boundaries due to oxidation and the creation of nanometric voids. Another observed growth mechanism was crack advance along phase boundaries with subsequent severe oxidation of the phase. This thesis comprises two parts. The first giving an introduction to the field of superalloys and the acting microstructural mechanisms that influence fatigue during dwell times. The second part consists of two appended papers, which report the work completed so far in the project.
Book Synopsis Fatigue Crack Propagation in Metals and Alloys by : Ulrich Krupp
Download or read book Fatigue Crack Propagation in Metals and Alloys written by Ulrich Krupp and published by John Wiley & Sons. This book was released on 2007-04-09 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive overview of the whole field of fatigue and fracture of metallic materials covers both the theoretical background and some of the latest experimental techniques. It provides a summary of the complex interactions between material microstructure and cracks, classifying them with respect to the overall damage process with a focus on microstructurally short cracks and dynamic embrittlement. It furthermore introduces new concepts for the numerical treatment of fatigue microcrack propagation and their implementation in fatigue-life prediction models.This comprehensive overview of the whole field of fatigue and fracture of metallic materials covers both the theoretical background and the latest experimental techniques. It provides a summary of the complex interactions between material microstructure and cracks, classifying them with respect to the overall damage process. It furthermore introduces new concepts for the numerical treatment of fatigue microcrack propagation and their implementation in fatigue-life prediction models.
Book Synopsis Fatigue of Materials III by : T. S. Srivatsan
Download or read book Fatigue of Materials III written by T. S. Srivatsan and published by John Wiley & Sons. This book was released on 2014-12-01 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains papers presented in the third international symposium titled Fatigue of Materials: Advances and Emergences in Understanding held during the Materials Science and Technology 2014 meeting in Pittsburgh, Pennsylvania, USA, in October 2014. The book contains contributions from engineers, technologists, and scientists from academia, research laboratories, and industries. The 19 papers are divided into five topical areas: Session 1: Aluminum Alloys Session 2: Ferrous Materials I Session 3: Ferrous Materials II Session 4: Composite Materials Session 5: Advanced Materials Session 6: Modeling The papers cover a broad spectrum of topics that represent the truly diverse nature of the subject of fatigue as it relates to the world of materials.
Book Synopsis The Role of Crack Growth in Metal Fatigue by : L. P. Pook
Download or read book The Role of Crack Growth in Metal Fatigue written by L. P. Pook and published by CRC Press. This book was released on 1983 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Fatigue Crack Propagation in Metallic Structures by : A. Carpinteri
Download or read book Handbook of Fatigue Crack Propagation in Metallic Structures written by A. Carpinteri and published by Newnes. This book was released on 2012-12-02 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this Handbook is to provide a review of the knowledge and experiences in the field of fatigue fracture mechanics. It is well-known that engineering structures can fail due to cyclic loading. For instance, a cyclically time-varying loading reduces the structure strength and can provoke a fatigue failure consisting of three stages: (a) crack initiation (b) crack propagation and (c) catastrophic failure. Since last century many scientists have tried to understand the reasons for the above-mentioned failures and how to prevent them. This Handbook contains valuable contributions from leading experts within the international scientific community and covers many of the important problems associated with the fatigue phenomena in civil, mechanical and nuclear engineering.
Book Synopsis Cracks in superalloys by : Jonas Saarimäki
Download or read book Cracks in superalloys written by Jonas Saarimäki and published by Linköping University Electronic Press. This book was released on 2018-01-18 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas turbines are widely used in industry for power generation and as a power source at hard to reach locations where other possibilities for electrical power supplies are insufficient. New ways of producing greener energy is needed to reduce emission levels. This can be achieved by increasing the combustion temperature of gas turbines. High combustion temperatures can be detrimental and degrade critical components. This raises the demands on the high temperature performance of the superalloys used in gas turbine components. These components are frequently subjected to different cyclic loads combined with for example dwell-times and overloads at elevated temperatures, which can influence the crack growth. Dwell-times have been shown to accelerate crack growth and change cracking behaviour in both Inconel 718, Haynes 282 and Hastelloy X. On the other hand, overloads at the beginning of a dwell-time cycle have been shown to retard the dwell-time effect on crack growth in Inconel 718. More experiments and microstructural investigations are needed to better understand these effects. The work presented in this thesis was conducted under the umbrella of the research program Turbo Power; "High temperature fatigue crack propagation in nickel-based superalloys", where I have mainly looked at fatigue crack growth mechanisms in superalloys subjected to dwell-fatigue, which can have a devastating effect on crack propagation behaviour. Mechanical testing was performed under operation-like cycles in order to achieve representative microstructures and material data for the subsequent microstructural work. Microstructures were investigated using light optical microscopy and scanning electron microscopy (SEM) techniques such as electron channeling contrast imaging (ECCI) and electron backscatter diffraction (EBSD). The outcome of this work has shown that there is a significant increase in crack growth rate when dwell-times are introduced at maximum load (0 % overload) in the fatigue cycle. With the introduction of a dwell-time there is also a shift from transgranular to intergranular crack growth for both Inconel 718 and Haynes 282. The crack growth rate decreases with increasing overload levels in Inconel 718 when an overload is applied prior to the dwell-time. At high temperature, intergranular crack growth was observed in Inconel 718 as a result of oxidation and the creation of nanometric voids. Another observed growth mechanism was crack advance along ?-phase boundaries with subsequent oxidation of the ?-phase. This thesis comprises two parts. Part I gives an introduction to the field of superalloys and the acting microstructural mechanisms related to fatigue and crack propagation. Part II consists of five appended papers, which report the work completed as part of the project.
Book Synopsis Fatigue Damage, Crack Growth and Life Prediction by : F. Ellyin
Download or read book Fatigue Damage, Crack Growth and Life Prediction written by F. Ellyin and published by Springer Science & Business Media. This book was released on 1996-11-30 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue failure is a multi-stage process. It begins with the initiation of cracks, and with continued cyclic loading the cracks propagate, finally leading to the rupture of a component or specimen. The demarcation between the above stages is not well-defined. Depending upon the scale of interest, the variation may span three orders of magnitude. For example, to a material scientist an initiated crack may be of the order of a micron, whereas for an engineer it can be of the order of a millimetre. It is not surprising therefore to see that investigation of the fatigue process has followed different paths depending upon the scale of phenomenon under investigation. Interest in the study of fatigue failure increased with the advent of industrial ization. Because of the urgent need to design against fatigue failure, early investiga tors focused on prototype testing and proposed failure criteria similar to design formulae. Thus, a methodology developed whereby the fatigue theories were proposed based on experimental observations, albeit at times with limited scope. This type of phenomenological approach progressed rapidly during the past four decades as closed-loop testing machines became available.
Book Synopsis Analysis of Metallurgical Failures by : Vito J. Colangelo
Download or read book Analysis of Metallurgical Failures written by Vito J. Colangelo and published by Wiley-Interscience. This book was released on 1974 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reference guide or undergraduate text shows how to determine, by analyzing metallurgical failures, the validity of a product design. This revision of a successful work features new techniques in electron microscopy, testing fracture toughness, and fracture mechanics. Describes destructive and nondestructive techniques regarding their advantages, limitations, applications, and meaning. Written to be understood by all engineers concerned about component failure this edition approaches typical problem areas from a physical and mechanical viewpoint. Describes the relationship between the practical and the theoretical, so that failure analyses can best be resolved and failure recurrence prevented. Maintains English and SI units throughout.
Book Synopsis Limite de fatigue des métaux by : Claude Bathias
Download or read book Limite de fatigue des métaux written by Claude Bathias and published by ISTE Group. This book was released on 2015-01-01 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: S’il est démontré que la rupture par fatigue peut se produire au-delà de 10^10 cycles, la question de la crédibilité de la notion de limite de fatigue normalisée se pose tant du point de vue pratique que fondamental. Après un état de l'art sur la fatigue gigacyclique des alliages industriels, cet ouvrage compile les résultats les plus récents sur cette même fatigue, incluant les phénomènes liés au champ de contraintes autour des défauts, la microplasticité, les transformations de phases, la dissipation thermique à haute fréquence, l'effet de la température et de la fréquence sur la courbe SN. Plus fondamentalement, le cas du fer Armco, bien connu pour sa courbe SN normalisée quasi-hyperbolique, est discuté dans le régime gigacyclique. Sur le plan pratique, la nonexistence du concept de durée de vie infinie est démontrée.
Book Synopsis Fatigue and Fracture of Non-metallic Materials and Structures by : Andrea Spagnoli
Download or read book Fatigue and Fracture of Non-metallic Materials and Structures written by Andrea Spagnoli and published by MDPI. This book was released on 2020-06-23 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanics of fracture and fatigue have produced a huge body of research work in relation to applications to metal materials and structures. However, a variety of non-metallic materials (e.g., concrete and cementitious composites, rocks, glass, ceramics, bituminous mixtures, composites, polymers, rubber and soft matter, bones and biological materials, and advanced and multifunctional materials) have received relatively less attention, despite their attractiveness for a large spectrum of applications related to the components and structures of diverse engineering branches, applied sciences and architecture, and to the load-carrying systems of biological organisms. This book covers the broad topic of structural integrity of non-metallic materials, considering the modelling, assessment, and reliability of structural elements of any scale. Original contributions from engineers, mechanical materials scientists, computer scientists, physicists, chemists, and mathematicians are presented, applying both experimental and theoretical approaches.
Book Synopsis Metallurgical Failure Analysis by : Charlie R. Brooks
Download or read book Metallurgical Failure Analysis written by Charlie R. Brooks and published by McGraw-Hill Companies. This book was released on 1993 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metallurgical failure analysis is vitally important to materials, metallurgical, and mechanical engineers responsible for the evaluation of faulty machinery and structural components. This reference provides an introduction to the basic principles of conditions leading to fracture and the methods for determining the causes of failure in metal parts.
Book Synopsis Metallography in Failure Analysis by : J. McCall
Download or read book Metallography in Failure Analysis written by J. McCall and published by Springer. This book was released on 1978-06 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed analyses of failures of material components have proved to be valuable in many ways; by preventing further failures, by assessing the validity of designs and the selection of materials, by uncovering shortcomings in the processing of the materials in volved through characterizations of defects, and by revealing problems introduced during the manufacture or fabrication of the component. Increased recognition of the value of performing failure analyses has caused the field to develop into a very active area of tech nical endeavor. Failure analysis has been employed in numerous different technical dis ciplines and has proven beneficial. The increased activity has caused many new and im proved methods for performing these analyses to be developed. Among these are many methods which can be characterized as generally belonging to the field of metallography. In recognition of the important role that metallography plays in the performance of failure analyses, the absence of a text that specifically discusses this subject, and the be lief that communication of information on the subject would be of technical interest, The American Society for Metals and The International Metallographic Society co sponsored a symposium. The intent was to bring together world-recognized authorities working in various aspects of the failure analysis and metallographic fields to share meth ods they use, results they have obtained, and the purposes to which they utilized these results. The symposium, entitled "Metallography in Failure Analysis", was held in Hous ton, Texas, USA, July 17-18, 1977.
Book Synopsis Mécanique de la rupture by : C. Bouhelier
Download or read book Mécanique de la rupture written by C. Bouhelier and published by . This book was released on 1989 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Current Research on Fatigue Cracks by : Tsuneshichi Tanaka
Download or read book Current Research on Fatigue Cracks written by Tsuneshichi Tanaka and published by . This book was released on 1987 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fracture, Fatigue and Structural Integrity of Metallic Materials by : Sergio Cicero
Download or read book Fracture, Fatigue and Structural Integrity of Metallic Materials written by Sergio Cicero and published by MDPI. This book was released on 2020-05-13 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture, fatigue, and other subcritical processes, such as creep crack growth or stress corrosion cracking, present numerous open issues from both scientific and industrial points of view. These phenomena are of special interest in industrial and civil metallic structures, such as pipes, vessels, machinery, aircrafts, ship hulls, and bridges, given that their failure may imply catastrophic consequences for human life, the natural environment, and/or the economy. Moreover, an adequate management of their operational life, defining suitable inspection periods, repairs, or replacements, requires their safety or unsafety conditions to be defined. The analysis of these technological challenges requires accurate comprehensive assessment tools based on solid theoretical foundations as well as structural integrity assessment standards or procedures incorporating such tools into industrial practice. This volume is focused on new advances in fracture, fatigue, and structural integrity of metallic structural components containing defects (e.g., cracks, notches, metal loss, etc.), and also on those developments that are being or could be incorporated into structural integrity assessment procedures, such as BS7910, R6, or API 579-1/ASME FFS-1.
Book Synopsis Effects of Changing Stress Amplitude on the Rate of Fatigue-crack Propagation in Two Aluminum Alloys by : C. M. Hudson
Download or read book Effects of Changing Stress Amplitude on the Rate of Fatigue-crack Propagation in Two Aluminum Alloys written by C. M. Hudson and published by . This book was released on 1961 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of fatigue tests with specimens subjected to constant amplitude and two-step axial loads were conducted on 12-inch-wide sheet specimens of 2024-T3 and 7075-T6 aluminum alloy to study the effects of a change in stress level on fatigue-crack propagation. Comparison of the results of the tests in which the specimens were tested at first a high and then a low stress level with those of the constant-stress-amplitude tests indicated that crack propagation was generally delayed after the transition to the lower stress level. In the tests in which the specimens were tested at first a low and then a high stress level, crack propagation continued at the expected rate after the change in stress levels.
