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Thermal fatigue failure and conventional fatigue crack propagation fracture...
Available to PurchasePublished: 01 December 2003
Fig. 3 Thermal fatigue failure and conventional fatigue crack propagation fracture during reversed load cycling of acetal. Source: Ref 10
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Book Chapter
Fatigue
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430325
EISBN: 978-1-62708-253-2
... tube fatigue, including mechanical or vibrational fatigue, corrosion fatigue, thermal fatigue, and creep-fatigue interaction. It discusses the causes, characteristics, and impacts of each type and provides several case studies. boiler tubes corrosion fatigue creep-fatigue interaction fatigue...
Abstract
Boiler tubes subjected to cyclic or fluctuating loads over extended periods of time are prone to fatigue failure. Fatigue can occur at relatively low stresses and is implicated in almost 80% of the tube failures in firetube boilers. This chapter covers the most common forms of boiler tube fatigue, including mechanical or vibrational fatigue, corrosion fatigue, thermal fatigue, and creep-fatigue interaction. It discusses the causes, characteristics, and impacts of each type and provides several case studies.
Book Chapter
Elevated-Temperature Failures
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630237
EISBN: 978-1-62708-270-9
... or its absence and the patterns on the fracture surface. Thermal Fatigue Fatigue may be caused either by cyclic mechanical stressing or by cyclic thermal stressing. Thermal-fatigue cracks are the result of repeated heating and cooling cycles, producing alternate expansion and contraction. When...
Abstract
Elevated-temperature failures are the most complex type of failure because all of the modes of failures can occur at elevated temperatures (with the obvious exception of low-temperature brittle fracture). Elevated-temperature problems are real concerns in industrial applications. The principal types of elevated-temperature failure mechanisms discussed in this chapter are creep, stress rupture, overheating failure, elevated-temperature fatigue, thermal fatigue, metallurgical instabilities, and environmentally induced failure. The causes, features, and effects of these failures are discussed. The cooling techniques for preventing elevated-temperature failures are also covered.
Book Chapter
High-Temperature Failures
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
... at temperatures greater than approximately 0.3 to 0.5 of the absolute melting point. In creep, thermal activation enables plastic deformation at stresses below those needed to deform the lattice without thermal activation. When a metal is placed under a constant load, it stretches elastically but also gradually...
Abstract
This chapter compares and contrasts the high-temperature behaviors of metals and composites. It describes the use of creep curves and stress-rupture testing along with the underlying mechanisms in creep deformation and elevated-temperature fracture. It also discusses creep-life prediction and related design methods and some of the factors involved in high-temperature fatigue, including creep-fatigue interaction and thermomechanical damage.
Book Chapter
Fatigue Failure Mechanisms
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780249
EISBN: 978-1-62708-281-5
... frequency is also found to cause fatigue fracture by conventional crack propagation at high stress amplitude. The interrelation of the two mechanisms, stress amplitude and frequency, for polyoxymethylene (acetal) is shown in Fig. 3 ( Ref 10 ). Fig. 3 Thermal fatigue failure and conventional fatigue...
Abstract
This article is a detailed account of the mechanisms of fatigue failure of polymers, namely thermal fatigue failure and mechanical fatigue failure. The mechanical fatigue failure is discussed in terms of fatigue crack initiation and fatigue crack propagation.
Book Chapter
Fatigue
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240243
EISBN: 978-1-62708-251-8
.... It describes the most effective methods of improving fatigue life. The chapter also explains the effect of geometrical stress concentrations on fatigue. In addition, it explores the environmental effects of corrosion fatigue, low-temperature fatigue, high-temperature fatigue, and thermal fatigue. Finally...
Abstract
Fatigue failures occur due to the application of fluctuating stresses that are much lower than the stress required to cause failure during a single application of stress. This chapter describes three basic factors that cause fatigue: a maximum tensile stress of sufficiently high value, a large enough variation or fluctuation in the applied stress, and a sufficiently large number of cycles of the applied stress. The discussion covers high-cycle fatigue, low-cycle fatigue, and fatigue crack propagation. The chapter then discusses the stages where fatigue crack nucleation and growth occurs. It describes the most effective methods of improving fatigue life. The chapter also explains the effect of geometrical stress concentrations on fatigue. In addition, it explores the environmental effects of corrosion fatigue, low-temperature fatigue, high-temperature fatigue, and thermal fatigue. Finally, the chapter discusses a number of design philosophies or methodologies to deal with design against fatigue failures.
Book Chapter
The Durability of Metals and Alloys
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060385
EISBN: 978-1-62708-261-7
...-Induced Failures High temperature and stress are common operating conditions for various parts and equipment in a number of industries. The principal types of elevated-temperature mechanical failure are creep and stress rupture, stress relaxation, low-cycle or high-cycle fatigue, thermal fatigue...
Abstract
Durability is a generic term used to describe the performance of a material or a component made from that material in a given application. In order to be durable, a material must resist failure by wear, corrosion, fracture, fatigue, deformation, and exposure to a range of service temperatures. This chapter covers several types of component and material failure associated with wear, temperature effects, and crack growth. It examines temperature-induced, brittle, ductile, and fatigue failures as well as failures due to abrasive, erosive, adhesive, and fretting wear and cavitation fatigue. It also discusses preventative measures.
Book Chapter
Introduction to Fatigue and Fracture
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610001
EISBN: 978-1-62708-303-4
... are often performed to predict when the next internal or external inspection should be performed. Typical life-limiting mechanisms include stress-corrosion cracking, fatigue, and thermal fatigue. Welded structures that could initiate a crack are often susceptible to these mechanisms. The leak-before-break...
Abstract
This chapter provides a brief review of industry’s battle with fatigue and fracture and what has been learned about the underlying failure mechanisms and their effect on product lifetime and service. It recounts some of the tragic events that led to the discovery of fatigue and brittle fracture and explains how they reshaped design philosophies, procedures, and tools. It also discusses the influence of material and manufacturing defects, operating conditions, stress concentration and intensity, temperature and pressure, and cyclic loading, all of which play a role in the onset of fatigue cracking and thus should be considered when predicting useful product life.
Book Chapter
Fatigue Fracture
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630117
EISBN: 978-1-62708-270-9
... Abstract Fatigue fractures are generally considered the most serious type of fracture in machinery parts simply because fatigue fractures can and do occur in normal service, without excessive overloads, and under normal operating conditions. This chapter first discusses the three stages...
Abstract
Fatigue fractures are generally considered the most serious type of fracture in machinery parts simply because fatigue fractures can and do occur in normal service, without excessive overloads, and under normal operating conditions. This chapter first discusses the three stages (initiation, propagation, and final rupture) of fatigue fracture followed by a discussion of its microscopic and macroscopic characteristics. The relationship between stress and strength in fatigue is explained. The next section provides information that may help the uninitiated to appreciate some of the problems of laboratory fatigue testing and of the fatigue process itself. Finally, information on types and statistical aspects of fatigue is provided along with examples.
Book Chapter
Fatigue
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490111
EISBN: 978-1-62708-340-9
..., and frequency) and factors such as temperature, material defects, component geometry, and processing history. It provides a detailed overview of the damage mechanisms associated with high-cycle and low-cycle fatigue as well as thermal fatigue, creep-fatigue, and fatigue-crack growth. It also demonstrates...
Abstract
This chapter describes the phenomenological aspects of fatigue and how to assess its effect on the life of components operating in high-temperature environments. It explains how fatigue is measured and expressed and how it is affected by loading conditions (stress cycles, amplitude, and frequency) and factors such as temperature, material defects, component geometry, and processing history. It provides a detailed overview of the damage mechanisms associated with high-cycle and low-cycle fatigue as well as thermal fatigue, creep-fatigue, and fatigue-crack growth. It also demonstrates the use of tools and techniques that have been developed to quantify fatigue-related damage and its effect on the remaining life of components.
Book Chapter
Special Materials: Polymers, Bone, Ceramics, and Composites
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870325
EISBN: 978-1-62708-344-7
.... Because large hysteresis loops can develop in polymers, the energy dissipated per cycle as heat may be considerably larger than in metals. And, also because of polymer’s low thermal conductivity, temperatures tend to become higher in localized regions, especially at cracks developed by fatigue. Even small...
Abstract
This chapter discusses the effect of fatigue on polymers, ceramics, composites, and bone. It begins with a general comparison of polymers and metals, noting important differences in microstructure and cyclic loading response. It then presents the results of several studies that shed light on the fatigue behavior and crack growth mechanisms of common structural polymers and moves on from there to discuss the fatigue behavior of bone and how it compares to stable and cyclically softening metals. It also discusses the fatigue characteristics of engineered and composited ceramics and ceramic fiber-reinforced metal-matrix composites.
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040295
EISBN: 978-1-62708-300-3
... to be manufactured. The second most common cause of die failure is fatigue fracture. Fatigue occurs as the result of the continual stress cycles that the dies are subjected to. The stress cycles are attributed to both mechanical and thermal loading and unloading of the dies. Fatigue is accelerated in the vicinity...
Abstract
This chapter addresses the issue of die failures in hot and cold forging operations. It describes failure classifications, fatigue fracture and wear mechanisms, analytical wear models, and the various factors that limit die life. It also includes several case studies in which finite-element modeling is used to predict die failure and extend die life.
Book Chapter
Residual Stresses
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630035
EISBN: 978-1-62708-270-9
... in the beam. Fig. 1 Spontaneous residual stress fracture in a 40-ft-long I-beam under no external load. Source: Ref 1 Residual stresses are defined as those stresses that are internal or locked into a part or assembly, even though the part or assembly is free from external forces or thermal...
Abstract
Residual, or locked-in internal, stresses are regions of misfit within a metal part or assembly that can cause distortion and fracture just as can the more obvious applied, or service, stresses. This chapter describes the fundamental facts about residual stresses and discusses the basic mechanisms of residual stress formation: thermal, transformational, mechanical, and chemical.
Book Chapter
Modes of Gear Failure
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 June 1985
DOI: 10.31399/asm.tb.sagf.t63420085
EISBN: 978-1-62708-452-9
... exerting a high amount of thrust. Figure 4-27(a) is an example of high end thrust that resulted in frictional heat. The thermal expansion and contraction initiated a large number of radial cracks that progressed as a fatigue fracture ( Fig. 4-27b ) both into the bore of the part and along the roots...
Abstract
This chapter presents a detailed discussion on the three most frequent gear failure modes. These include tooth bending fatigue, tooth bending impact, and abrasive tooth wear. Tooth bending fatigue includes surface contact fatigue (pitting), rolling contact fatigue, contact fatigue (spalling), thermal fatigue, and shaft fatigue. Tooth bending impact includes tooth shear, tooth chipping, case crushing, and torsional shear.
Book Chapter
Life Assessment of Steam-Turbine Components
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490265
EISBN: 978-1-62708-340-9
... materials and designs with improved thermal fatigue resistance. This chapter will review the material-property requirements, damage mechanisms, and damage-assessment procedures for the key components of the steam turbine. Damage mechanisms and the general principles of remaining-life assessment for steam...
Abstract
This chapter covers the failure modes and mechanisms of concern in steam turbines and the methods used to assess remaining component life. It provides a detailed overview of the design considerations, material requirements, damage mechanisms, and remaining-life-assessment methods for the most-failure prone components beginning with rotors and continuing on to casings, blades, nozzles, and high-temperature bolts. The chapter makes extensive use of images, diagrams, data plots, and tables and includes step-by-step instructions where relevant.
Book Chapter
Fatigue and Fracture of Ceramics and Polymers
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610327
EISBN: 978-1-62708-303-4
... components, burner nozzles, heat exchanger heating elements, noniron metallurgy insulating parts, thermal barrier coatings Mechanical Long-term, high-temperature resistance, fatigue, thermal shock, wear resistance Wear parts; sealings; bearings; cutting tools; engine, motor, and gas turbine parts...
Abstract
This chapter covers the fatigue and fracture behaviors of ceramics and polymers. It discusses the benefits of transformation toughening, the use of ceramic-matrix composites, fracture mechanisms, and the relationship between fatigue and subcritical crack growth. In regard to polymers, it covers general characteristics, viscoelastic properties, and static strength. It also discusses fatigue life, impact strength, fracture toughness, and stress-rupture behaviors as well as environmental effects such as plasticization, solvation, swelling, stress cracking, degradation, and surface embrittlement.
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130241
EISBN: 978-1-62708-284-6
...). These problems have been sufficiently dealt with in the technical literature. In the process of searching for methods to increase fatigue resistance, there are some constant elements that have a favorable effect, including enhancing treatments such as thermal, thermochemical, as well as surface work...
Abstract
This chapter discusses the various factors influencing the evaluation of fatigue fracture of nitrided layers. It begins by describing the problems of enhancing the fatigue resistance of machine components. The significance and detailed assessment of the effect of a structural flaw are then explained, using investigations of the effect of variable core conditions on fatigue resistance as an example. This is followed by a discussion on the processes involved in the evaluation of fatigue properties of nitrided steels. The chapter also describes the determination of the fatigue characteristics of nitrided steels after the carbonitriding treatment.
Book Chapter
Introduction to Damage Mechanisms with Case Studies
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430147
EISBN: 978-1-62708-253-2
...-side erosion: Soot blower erosion Fly ash erosion Coal particle erosion Falling slag erosion Erosion due to steam cutting Fatigue: Mechanical fatigue Thermal fatigue Corrosion fatigue Creep-fatigue interaction Operation failures: Failures due to operational...
Abstract
This chapter provides an outline of the failure modes and mechanisms associated with most boiler tube failures in coal-fired power plants. Primary categories include stress rupture failures, water-side corrosion, fire-side corrosion, fire-side erosion, fatigue, operation failures, and insufficient quality control.
Book Chapter
Aerospace Applications—Example Fatigue Problems
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060231
EISBN: 978-1-62708-343-0
... place? Was this a case of mechanical fatigue, environmentally assisted fatigue, thermal fatigue, brittle fracturing, stress-corrosion cracking, improper machining and fabrication processes, or improper alloy chemistry or heat treatment? What had been the mission loading history of the disk prior...
Abstract
This chapter explains how the authors assessed the potential risks of creep-fatigue in several aerospace applications using the tools and techniques presented in earlier chapters. It begins by identifying the fatigue regimes encountered in the main engines of the Space Shuttle. It then describes the types of damage observed in engine components and the methods used to mitigate problems. It also discusses the results of analyses that led to changes in design or approach and examines fatigue-related issues in turbine engines used in commercial aircraft.
Book Chapter
Introduction
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870001
EISBN: 978-1-62708-344-7
... Fretting fatigue Thermal shock Buckling Costs taken into account Costs incurred because of actual failures Cost of pain, injury, death, and medical treatment to victims Business delays or property damage Insurance administration Cargo losses Environmental cleanups Prevention...
Abstract
This chapter gives a brief overview of the role of fatigue in component failures. It presents examples of fatigue failures along with statistics on the causes and costs of fatigue damage in various industries. It also includes a chapter-by-chapter summary of the content in the book, noting that the book deals primarily with fatigue at temperatures below the creep range with high-temperature fatigue being treated in a companion publication.
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