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Book Chapter

Series: 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...
Book Chapter

By Aleksander Nakonieczny
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130241
EISBN: 978-1-62708-284-6
... 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...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610209
EISBN: 978-1-62708-303-4
... Abstract This chapter provides information and data on the fatigue and fracture properties of steel, aluminum, and titanium alloys. It explains how microstructure, grain size, inclusions, and other factors affect the fracture toughness and fatigue life of these materials and the extent to which...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610001
EISBN: 978-1-62708-303-4
... 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...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610327
EISBN: 978-1-62708-303-4
... 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610377
EISBN: 978-1-62708-303-4
... Abstract Unlike metals, in which fatigue failures are due to a single crack that grows to a critical length, the effects of fatigue in composites are much more distributed and varied. As the chapter explains, there are five major damage mechanisms that contribute to the progression of composite...
Book Chapter

By Tarsem Jutla
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930113
EISBN: 978-1-62708-359-1
... Abstract This article discusses the various options for controlling fatigue and fracture in welded steel structures, the factors that influence them the most, and some of the leading codes and standards for designing against these failure mechanisms. The two most widely used approaches...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.9781627083034
EISBN: 978-1-62708-303-4
Image
Published: 01 November 2012
Fig. 23 Surface of a torsional fatigue fracture that caused brittle fracture of the case of an induction-hardened axle of 1541 steel. The fatigue crack originated (arrow) at a fillet (with a radius smaller than specified) at a change in shaft diameter near a keyway runout. Case hardness More
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Published: 01 March 2006
Fig. 10.8 Scanning electron microscopy studies of fatigue-fracture surface by replication. Material: 7075-T6 aluminum alloy; fatigue life, 56,000 cycles. Source: Ref 10.31 More
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Published: 01 March 2006
Fig. 10.30 Fatigue fracture surface of 7075-T6 aluminum showing the striations produced by a program consisting of a severe overload followed by ten constant amplitude load cycles. Source: Ref 10.24 More
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Published: 01 December 1999
Fig. 5.40 Fatigue fracture of bearing steel caused by inclusions in rotary bending. Distance from steel surface vs. diameter of inclusions that initiated fatigue fracture. Source: Ref 60 , 73 Steel Composition, % C Si Mn P S Cr Ni Cu ○ 1.04 0.27 0.40 0.013 0.011 More
Image
Published: 01 September 2005
Fig. 8 Fatigue fracture in gas-carburized and modified 4320 steel. (a) Overview of initiation, stable crack propagation, and unstable crack propagation. (b) Same area as shown in (a), but with extent of stable crack indicated by dashed line. (c) Higher magnification of intergranular initiation More
Image
Published: 01 September 2005
Fig. 7 Bending-fatigue fracture in the heel of one tooth of a spiral bevel pinion of AISI 8617 steel, carburized and hardened to 57 HRC in the case. Fracture resulted from severe pitting. Note that pitting had begun in an adjoining tooth (near top). Original magnification at 0.75× More
Image
Published: 01 September 2005
Fig. 8 Bending-fatigue fracture in two teeth of a reverse idler gear of AISI 8617 steel, carburized and hardened to 60 HRC in the case. Arrows point to the root fillets on both sides of each tooth, where fracture began due to excessive stress in these locations. Original magnification at ~2× More
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Published: 01 September 2005
Fig. 10 Surface of a bending-fatigue fracture in a tooth (upper tooth in this view) of a large spiral bevel pinion of AISI 8620 steel carburized and hardened to 60 HRC at the surface. The arrow marks the fatigue-crack origin, in the root fillet. The absence of this tooth resulted in fracture More
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Published: 01 September 2005
Fig. 27 Surface of a spalling-fatigue fracture in a single tooth of a heavily loaded final-drive pinion of AISI 8620 steel, carburized and hardened to 60 HRC in the case, showing vertical scratches, which indicate that appreciable abrasive wear took place also. The surface ripples at right More
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Published: 01 September 2005
Fig. 42 Fatigue fracture of AISI 4140 bull gear due to improper heat treatment. The one-of-a-kind replacement gear had a service life of just 2 weeks. Heat treatment did not produce full hardness in gear teeth. Hardness at tooth face, 15 HRC; at tooth core, 82 HRB. (a) Outside diameter of gear More
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Published: 30 November 2013
Fig. 6 Fatigue fracture of a 3¼ in. diam induction-hardened shaft of 1541 steel after fatigue testing in rotary bending. Fatigue fracture origins A and B were subsurface due to the steep induction-hardened gradient and lack of an external stress concentration. (See Fig. 9 in Chapter 3 More
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Published: 30 November 2013
Fig. 13 Multiple-origin fatigue fracture of a short, stubby ⅝ in. bolt that fractured under tensile fatigue. (a) Numerous fatigue origins separated by radial ratchet marks. (b) Close-up of several fatigue origins separated by ratchet marks. Because this bolt was in a continuously operated test More