Thermomechanical Fatigue Crack Propagation in an Anisotropic (Directionally Solidified) Nickel-Base Superalloy

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ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Thermomechanical Fatigue Crack Propagation in an Anisotropic (Directionally Solidified) Nickel-Base Superalloy by : AE. Gemma

Download or read book Thermomechanical Fatigue Crack Propagation in an Anisotropic (Directionally Solidified) Nickel-Base Superalloy written by AE. Gemma and published by . This book was released on 1976 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strain-controlled thermomechanical fatigue tests were performed on two nickel-base superalloys, directionally solidified (DS) Mar-M200 plus hafnium and conventionally cast B-1900 plus hafnium. The DS alloy was tested at various angles (?) to the direction of grain growth. It was found that crack growth rates were a minimum for the DS alloy tested parallel to the direction of grain growth (crack propagating normal to the direction of grain growth). The crack growth rate increased for other orientations in the sequence ? = 15, 30 or 90, and 45 deg until equivalence was reached with rates for the conventionally cast alloy, B-1900 plus hafnium. A linear elastic fracture mechanics approach was extended to strain-controlled crack growth as a function of ? for the DS alloy. Prediction of crack growth rates as a function of ? was achieved by normalizing with the elastic modulus. The sequencing of crack growth rates with ? and a smooth-to-rough fracture surface transition are explained on the basis of the orientation dependence of crack opening displacement for a given strain intensity range.

Thermomechanical fatigue behavior of materials

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Publisher : ASTM International
ISBN 13 : 080312001X
Total Pages : 382 pages
Book Rating : 4.8/5 (31 download)

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Book Synopsis Thermomechanical fatigue behavior of materials by : Michael J. Verrilli

Download or read book Thermomechanical fatigue behavior of materials written by Michael J. Verrilli and published by ASTM International. This book was released on 1996 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Scatter in Fatigue Crack Growth Rate in a Directionally Solidified Nickel-Base Superalloy

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ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Scatter in Fatigue Crack Growth Rate in a Directionally Solidified Nickel-Base Superalloy by : S. Highsmith

Download or read book Scatter in Fatigue Crack Growth Rate in a Directionally Solidified Nickel-Base Superalloy written by S. Highsmith and published by . This book was released on 2004 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Directional solidification of nickel-base superalloy components for gas turbine rotor blades offers a significant improvement in creep strength while at the same time yielding an anisotropic, heterogeneous microstructure. In such a material, some of the continuum assumptions of linear elastic fracture mechanics begin to break down, and local (microscopic) conditions can lead to significant deviation in fatigue crack growth rate from the global (macroscopic) trend. Fatigue crack life prediction for a large population of fielded components requires a probabilistic treatment of the material fatigue crack growth behavior. A common approach to probabilistic fatigue crack life prediction involves sampling the Paris law coefficients from a large number of crack growth experiments, which can lead to effectively "smoothing" the local intraspecimen variability out of the model. The length scale of variability is discussed as it relates to material microstructure and crack life prediction. Results from fatigue crack growth experiments on a directionally solidified superalloy are presented and spatial variation in the fatigue crack growth rate is examined. Periodicity of the crack growth rate variation is compared with the scale of microstructural heterogeneity.

Thermal Fatigue of Materials and Components

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Publisher : ASTM International
ISBN 13 :
Total Pages : 271 pages
Book Rating : 4./5 ( download)

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Book Synopsis Thermal Fatigue of Materials and Components by : David A. Spera

Download or read book Thermal Fatigue of Materials and Components written by David A. Spera and published by ASTM International. This book was released on 1976 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Thermal-Mechanical Fatigue Crack Propagation in Nickel- and Cobalt-Base Superalloys Under Various Strain-Temperature Cycles

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ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Thermal-Mechanical Fatigue Crack Propagation in Nickel- and Cobalt-Base Superalloys Under Various Strain-Temperature Cycles by : AE. Gemma

Download or read book Thermal-Mechanical Fatigue Crack Propagation in Nickel- and Cobalt-Base Superalloys Under Various Strain-Temperature Cycles written by AE. Gemma and published by . This book was released on 1973 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crack propagation rates under isothermal and thermal fatigue cycling have been determined for a conventionally-cast cobalt-base superalloy, and conventionally-cast and directionally-solidified nickel-base superalloys. Linear elastic fracture mechanics, where the crack growth rates under different strain ranges or for various crack lengths depend only on the strain intensity factor range, was found to be applicable over the range of crack growth rates of most practical importance. A comparison of crack growth rates is made for thermal fatigue under various strain-temperature cycles and isothermal low-cycle fatigue, and the influence of coatings and superimposed creep is discussed.

ASM Specialty Handbook

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Publisher : ASM International
ISBN 13 : 9780871705969
Total Pages : 608 pages
Book Rating : 4.7/5 (59 download)

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Book Synopsis ASM Specialty Handbook by : Joseph R. Davis

Download or read book ASM Specialty Handbook written by Joseph R. Davis and published by ASM International. This book was released on 1997-01-01 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials covered include carbon, alloy and stainless steels; alloy cast irons; high-alloy cast steels; superalloys; titanium and titanium alloys; refractory metals and alloys; nickel-chromium and nickel-thoria alloys; structural intermetallics; structural ceramics, cermets, and cemented carbides; and carbon-composites.

Aerospace Structural Metals Handbook

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Publisher :
ISBN 13 :
Total Pages : 828 pages
Book Rating : 4.:/5 (327 download)

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Book Synopsis Aerospace Structural Metals Handbook by :

Download or read book Aerospace Structural Metals Handbook written by and published by . This book was released on 1989 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Modelling of Crack Growth in Single-Crystal Nickel-Base Superalloys

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Publisher : Linköping University Electronic Press
ISBN 13 : 9179299830
Total Pages : 55 pages
Book Rating : 4.1/5 (792 download)

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Book Synopsis Modelling of Crack Growth in Single-Crystal Nickel-Base Superalloys by : Christian Busse

Download or read book Modelling of Crack Growth in Single-Crystal Nickel-Base Superalloys written by Christian Busse and published by Linköping University Electronic Press. This book was released on 2019-09-24 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation was produced at the Division of Solid Mechanics at Linköping University and is part of a research project, which comprises modelling, microstructure investigations and material testing of cast nickel-base superalloys. The main objective of this work was to deepen the understanding of the fracture behaviour of single-crystal nickel-base superalloys and to develop a model to predict the fatigue crack growth behaviour. Frequently, crack growth in these materials has been observed to follow one of two distinct cracking modes; Mode I like cracking perpendicular to the loading direction or crystallographic crack growth on the octahedral {111}-planes, where the latter is associated with an increased fatigue crack growth rate. Thus, it is of major importance to account for this behaviour in component life prediction. Consequently, a model for the prediction of the transition of cracking modes and the correct active crystallographic plane, i.e. the crack path, and the crystallographic crack growth rate has been developed. This model is based on the evaluation of appropriate crack driving forces using three-dimensional finite-element simulations. A special focus was given towards the influence of the crystallographic orientation on the fracture behaviour. Further, a model to incorporate residual stresses in the crack growth modelling is presented. All modelling work is calibrated and validated by experiments on different specimen geometries with different crystallographic orientations. This dissertation consists of two parts, where Part I gives an introduction and background to the field of research, while Part II consists of six appended papers. Die vorliegende Dissertation wurde in der Abteilung für Festigkeitslehre an der Universität von Linköping erstellt und ist Teil eines Forschungsprojektes, welches Modellierung, Mikrostrukturuntersuchungen und Materialtests von gegossenen nickelbasierten Superlegierungen umfasst. Das Hauptziel dieser Arbeit war es, das Verständnis des Bruchverhaltens von einkristallinen Superlegierungen auf Nickelbasis zu vertiefen und ein Modell zur Vorhersage des Wachstumsverhaltens von Ermüdungsrissen zu entwickeln. Es wurde beobachtet, dass das Risswachstum in diesen Materialien einem von zwei unterschiedlichen Rissmodi folgt; Modus I Rissfortschritt senkrecht zur Belastungsrichtung oder kristallographisches Risswachstum auf den oktaedrischen f111g-Ebenen, wobei letzteres mit einer erhöhten Ermüdungsrisswachstumsrate verbunden ist. Somit ist es von grosser Bedeutung dieses Verhalten in der Lebensdauervorhersage einer Komponente zu berücksichtigen. Demzufolge wurde ein Modell für die Vorhersage des Übergangs zwischen den Rissmodi und der korrekten aktiven kristallographischen Ebene, d.h. des Risspfades, sowie der kristallographischen Risswachstumsrate erarbeitet. Dieses Modell basiert auf geeigneten Rissantriebskräften, welche mit Hilfe dreidimensionaler Finite-Elemente-Simulationen berechnet werden. Im Fokus stand insbesondere der Einuss der kristallographischen Orientierung auf das Bruchverhalten. Ausserdem wird ein Modell zur Berücksichtigung von Restspannungen in der Risswachstumsmodellierung präsentiert. Alle Modellierungsarbeiten wurden durch Experimente an verschiedenen Probengeometrien mit unterschiedlichen kristallographischen Orientierungen kalibriert und validiert. Diese Dissertation besteht aus zwei Teilen, wobei Teil I aus einer Einführung und einem Hintergrund in das Forschungsgebiet und Teil II aus sechs beigefügten Forschungsartikeln besteht.

Low-cycle Thermal Fatigue

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ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Low-cycle Thermal Fatigue by : Gary R. Halford

Download or read book Low-cycle Thermal Fatigue written by Gary R. Halford and published by . This book was released on 1986 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Comprehensive Structural Integrity

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Publisher : Elsevier
ISBN 13 : 0080490735
Total Pages : 4647 pages
Book Rating : 4.0/5 (84 download)

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Book Synopsis Comprehensive Structural Integrity by : Ian Milne

Download or read book Comprehensive Structural Integrity written by Ian Milne and published by Elsevier. This book was released on 2003-07-25 with total page 4647 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this major reference work is to provide a first point of entry to the literature for the researchers in any field relating to structural integrity in the form of a definitive research/reference tool which links the various sub-disciplines that comprise the whole of structural integrity. Special emphasis will be given to the interaction between mechanics and materials and structural integrity applications. Because of the interdisciplinary and applied nature of the work, it will be of interest to mechanical engineers and materials scientists from both academic and industrial backgrounds including bioengineering, interface engineering and nanotechnology. The scope of this work encompasses, but is not restricted to: fracture mechanics, fatigue, creep, materials, dynamics, environmental degradation, numerical methods, failure mechanisms and damage mechanics, interfacial fracture and nano-technology, structural analysis, surface behaviour and heart valves. The structures under consideration include: pressure vessels and piping, off-shore structures, gas installations and pipelines, chemical plants, aircraft, railways, bridges, plates and shells, electronic circuits, interfaces, nanotechnology, artificial organs, biomaterial prostheses, cast structures, mining... and more. Case studies will form an integral part of the work.

High Temperature Fatigue

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Publisher : Springer Science & Business Media
ISBN 13 : 940093453X
Total Pages : 330 pages
Book Rating : 4.4/5 (9 download)

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Book Synopsis High Temperature Fatigue by : R.P. Skelton

Download or read book High Temperature Fatigue written by R.P. Skelton and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: About 35 years ago, thermal fatigue was identified as an important phenomenon which limited the lifetime of high temperature plant. In the intervening years many investigations have been carried out, primarily to give guidance on likely endurance (especially in the presence of time dependent deformation) but latterly, with the introduction of sophisticated testing machines, to provide knowledge of the underlying mechanisms of failure. A previous edited book (Fatigue at High Temperature, Elsevier Applied Science Publishers, 1983) summarised the state-of-the-art of high temperature fatigue testing and examined the factors influencing life, such as stress state, environment and microstructural effects. It also considered, in some detail, cyclic crack growth as a more rigorous approach to life limitation. The aim of the present volume (which in style and format follows exactly the same lines as its predecessor) is once again to pursue the desire to translate detailed laboratory knowledge into engineering design and assessment. There is, for example, a need to consider the limitations of the laboratory specimen and its relationship with engineering features. Many design procedures still rely on a simple endurance approach based on failure of a smooth specimen, and this is taken to indicate crack initiation in the component. In this volume, therefore, crack propagation is covered only incidentally, emphasis being placed instead on basic cyclic stress strain properties, non-isothermal behaviour, metallography, failure criteria and the need for agreed testing procedures.

Numerical Modeling of Fatigue Crack Growth in Single Crystal Nickel Based Superalloys

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ISBN 13 :
Total Pages : 159 pages
Book Rating : 4.:/5 (8 download)

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Book Synopsis Numerical Modeling of Fatigue Crack Growth in Single Crystal Nickel Based Superalloys by : Ozgur Aslan

Download or read book Numerical Modeling of Fatigue Crack Growth in Single Crystal Nickel Based Superalloys written by Ozgur Aslan and published by . This book was released on 2010 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single crystal components operating at elevated temperatures are subjected to severe thermomechanical loading conditions. The geometry and behaviour of these components are now very complex. A major issue is to develop models to predict crack initiation and crack growth in the presence of strong stress and temperature gradients. The strongly anisotropic elastoviscoplastic behaviour of the material which is a single crystal nickel base superalloy, must be taken into account. The corresponding model should be able to account for anisotropic crack growth and crack bifurcation in complex stress elds. Moreoever the model must be capable of predicting not only the crack growth rate but also the non-straight crack paths. Anisotropic damage mechanics is a well-suited theoretical framework for the development of crack growth models in single crystals. A model coupling crystal plasticity and cyclic damage has been developed in a previous project, that shows the interest of the approach, but also its current limits, in particular the strong mesh dependence of the results. Recent development of nonlocal models within the framework of the mechanics of generalized continua could help overcoming these difficulties. A large experimental basis exists concerning initiation and crack growth in single crystal nickel base superalloys. Finite element simulations of the thermomechanics of turbine blades provide detailed information about stress and plastic strain distribution, in particular near geometrical singularities like cooling holes and slits. First of all, on the basis of crystal plasticity theory which provides a solid link between stress and plastic strains, an uncoupled damage mechanics model based on the history of FE calculations will be presented. Afterwards, an incremental damage model based on generalized continua will be proposed and model predictions for the initiation and growth of microcracks by solving the mesh dependency, will be discussed.

ASTM Special Technical Publication

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ISBN 13 :
Total Pages : 280 pages
Book Rating : 4.3/5 (126 download)

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Book Synopsis ASTM Special Technical Publication by :

Download or read book ASTM Special Technical Publication written by and published by . This book was released on 1976 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Constitutive modelling of an additively manufactured alloy for fatigue lifing in high temperature applications

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Publisher : Linköping University Electronic Press
ISBN 13 : 9179298494
Total Pages : 27 pages
Book Rating : 4.1/5 (792 download)

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Book Synopsis Constitutive modelling of an additively manufactured alloy for fatigue lifing in high temperature applications by : Thomas Lindström

Download or read book Constitutive modelling of an additively manufactured alloy for fatigue lifing in high temperature applications written by Thomas Lindström and published by Linköping University Electronic Press. This book was released on 2020-04-28 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of the work presented in this Licentiate thesis is to investigate and model the cyclic behaviour of an additively manufactured ductile nickel-based superalloy, with special emphasis on modelling the stabilised material behaviour, which is of interest for fatigue life predictions. Cyclic fatigue tests at different temperatures have been performed to investigate the cyclic mechanical behaviour of the material, where specimens built in different orientations have been used to also study the anisotropic behaviour of the material. Based on the tests, a constitutive description has progressively been developed and implemented in a finite element context that incorporates the anisotropic behaviour under both elastic and inelastic deformations. In addition, the room temperature crack initiation behaviour has been studied and modelled. This thesis is divided into two parts. The first part gives an introduction and background to the research, while the second part consists of three included papers. Det huvudsakliga målet med arbetet som presenteras i denna avhandling har varit att studera och modellera det cykliska beteendet hos en additivt tillverkad duktil nickelbaserad superlegering, med fokus på att modellera det stabiliserade materialbeteendet, vilket är av intresse vid livslängdprediktering. Cykliska utmattningsprov vid olika temperaturer har utförts för att studera det cykliska beteendet hos materialet, där provstavar byggda i olika riktningar har använts för att studera materialets anisotropi. Baserat på proven har en konstitutiv beskrivning av material progressivt utvecklats och implementerats i ett finita element-verktyg, där modellen tar hänsyn till det anisotropa materialbeteendet för både elastiska och plastiska deformationer. En modell för prediktering av sprickinitiering vid rumstemperatur har också tagits fram. Denna avhandling består av två delar. Den första delen ger en introduktion samt bakgrund till forskningen, medan den andra delen består av tre inkluderade artiklar.

Elevated Temperature Fretting and Oxidation Processes of Nickel-base Superalloy Turbine Blade Attachments

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Publisher :
ISBN 13 :
Total Pages : 324 pages
Book Rating : 4.3/5 (129 download)

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Book Synopsis Elevated Temperature Fretting and Oxidation Processes of Nickel-base Superalloy Turbine Blade Attachments by : Kim K. Van den Ende

Download or read book Elevated Temperature Fretting and Oxidation Processes of Nickel-base Superalloy Turbine Blade Attachments written by Kim K. Van den Ende and published by . This book was released on 1987 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Thermo-mechanical Fatigue Crack Growth Modeling of a Nickel-based Superalloy

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (825 download)

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Book Synopsis Thermo-mechanical Fatigue Crack Growth Modeling of a Nickel-based Superalloy by : Vincent Mark Barker

Download or read book Thermo-mechanical Fatigue Crack Growth Modeling of a Nickel-based Superalloy written by Vincent Mark Barker and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A model was created to predict the thermo-mechanical fatigue crack growth rates under typical engine spectrum loading conditions. This model serves as both a crack growth analysis tool to determine residual lifetime of ageing turbine components and as a design tool to assess the effects of temperature and loading variables on crack propagation. The material used in the development of this model was a polycrystalline superalloy, Inconel 100 (IN-100). The first step in creating a reliable model was to define the first order effects that influence TMF crack growth in a typical engine spectrum. Load interaction effects were determined to be major contributors to lifetime estimates by influencing crack growth rates based upon previous load histories. A yield zone model was modified to include temperature dependent properties that controlled the effects of crack growth retardation and acceleration based upon overloads and underloads, respectively. Multiple overload effects were included in the model to create enhanced retardation compared to single overload tests. Temperature interaction effects were also considered very important due to the wide temperature ranges of turbine engine components. Oxidation and changing temperature effects were accounted for by accelerating crack growth in regions that had been affected by higher temperatures. Constant amplitude crack growth rates were used as a baseline, upon which load and temperature interaction effects were applied. Experimental data of isolated first order effects was used to calibrate and verify the model. Experimental data provided the means to verify that the model was a good fit to experimental results. The load interaction effects were described by a yield zone model, which included temperature dependent properties. These properties were determined experimentally and were essential in the model's development to include load and temperature contributions. Other interesting factors became apparent through testing. It was seen that specific combinations of strain rate and temperature would lead to serrated yielding, discovered to be the Portevin-Le Chatelier effect. This effect manifested itself as enhanced hardening, leading to unstable strain bursts in specimens that cyclically yielded while changing temperature.

Scientific and Technical Aerospace Reports

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Publisher :
ISBN 13 :
Total Pages : 968 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt: