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fatigue fracture appearance

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270100
EISBN: 978-1-62708-301-0
... that opens and closes the doors to the undercarriage compartment. The failed component was removed from the aircraft and examined using optical and electron microscopes. Under low magnification, the fracture surface appeared jagged except for one corner that was relatively smooth. SEM fractography revealed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270118
EISBN: 978-1-62708-301-0
...Abstract Abstract A first-stage compressor blade failed prematurely in an aircraft engine, fracturing at the midpoint of the root transition region. An examination of the fracture surface revealed beach marks, striations, and pitting, indicating that the blade failed by fatigue due to a crack...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770077
EISBN: 978-1-62708-337-9
..., and how to effectively stabilize or otherwise control it. It presents detailed images and data plots showing how retained austenite appears and how it influences hardness, tensile properties, residual stresses, fatigue and fracture behaviors, and wear resistance. References References 1. Rose...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540121
EISBN: 978-1-62708-309-6
... and demonstrate their use on different metals and alloys. The chapter also discusses design-based approaches for preventing fatigue failures. crack initiation crack propagation fatigue analysis fatigue fracture appearance fatigue life fatigue strength THE DEFINITION OF “FATIGUE” according to ASTM...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780404
EISBN: 978-1-62708-281-5
... of macroscopic appearance, and the examination and interpretation of the features of fracture surfaces. In addition, the article considers several cases of field failure in various polymers to illustrate the applicability of available analytical tools in conjunction with an understanding of failure mechanisms...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240243
EISBN: 978-1-62708-251-8
.... , Fatigue Fracture Appearances , Failure Analysis and Prevention , Vol 11 , ASM Handbook , ASM International , 2002 There are three basic factors necessary to cause fatigue: (1) a maximum tensile stress of sufficiently high value, (2) a large enough variation or fluctuation in the applied stress...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780417
EISBN: 978-1-62708-281-5
... of this material exhibit the feature known as matrix rollers. This feature consists of resin that tends to roll up on itself, as shown in Fig. 20 . The appearance of these rollers, either between two fibers and/or on the top of the fracture surface, also indicates fatigue failure of the part. Fig. 19...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130351
EISBN: 978-1-62708-284-6
... (25 μm) Fig. 75 As-received condition of the failed bolt Fig. 76 Fracture surface of the failed bolt Fig. 77 Machining marks and polishing evident on the shank of the failed bolt Fig. 78 SEM micrograph of representative multiple fatigue origins associated...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270092
EISBN: 978-1-62708-301-0
..., and the rest showed a jagged surface. The features on the flat region had the appearance of beach marks, although the surface had been rubbed ( Fig. CH13.6 ). Scanning electron microscopy did not clearly reveal fatigue striations. Fig. CH13.6 Features resembling beach marks on the fracture surface...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270067
EISBN: 978-1-62708-301-0
... surface revealed a well-defined crescent-shaped area with smooth fracture features ( Fig. CH2.2a ), indicative of fatigue fracture. The fatigue crack was found to have initiated at the leading edge of the blade. The remaining fracture surface had a crystalline appearance, typical of high-temperature...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250257
EISBN: 978-1-62708-345-4
... to that radius As the fracture progressed, the tooth deflected at each cycle until the load was picked up simultaneously by the top corner of the next tooth, which (because it was now overloaded) soon started a tooth-bending fatigue failure in the same area. The fracture of the second tooth appears...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630063
EISBN: 978-1-62708-270-9
... and fatigue fractures occurred because the metal had “crystallized.” Understandably, this usage arose because certain types of fractures are bright and sparkling when they first occur and do appear to be crystalline. In fact, however, the metals were crystalline when they solidified from the liquid, or molten...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.9781627083096
EISBN: 978-1-62708-309-6
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060385
EISBN: 978-1-62708-261-7
... ). The ratchet mark appears on the fracture surface in the vicinity of the multiple initiation sites. Although ratchet marks may also form in monotonic loading in some cases, they are significantly smaller in number and less frequently seen than fatigue ratchet marks. Radial marks are another feature...
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
... is visible, appearing to swing counterclockwise on this section because the rotation was in a clockwise direction. Fig. 30 Rotating bending fatigue fracture of a 2-in.-diam grade 1035 steel shaft, hardness 143 HB. The part was designed with a large radius joining the shaft to the shoulder...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780109
EISBN: 978-1-62708-268-6
... by the failed part were within the predicted fatigue life for the part. Fig. 12.4 Fatigue fracture surface appearance of a failed crankshaft, showing beach marks on the lower part. The origin of the primary fracture is indicated by the arrow. Source: Ref 1 Deformation refers to the occurrence...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130111
EISBN: 978-1-62708-284-6
...-contact fatigue appears like wear in early stages Multiple intergranular fissures covered with reaction scale Grain faces may show porosity Metallographic inspection, 50 to 1000× (cross section) Grain distortion and flow near fracture Irregular, transgranular fracture Little...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180151
EISBN: 978-1-62708-256-3
..., viewed under the scanning electron microscope. Note that fracture takes place between the grains; thus the fracture surface has a “rock-candy” appearance that reveals the shapes of part of the individual grains. Original magnification at 2000× Fig. 9 Fatigue striations in low-carbon alloy steel...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030117
EISBN: 978-1-62708-282-2
... alloy tested in ambient air. Intergranular cracking and fatigue striations are evident on the fracture surface; the grain appears to have separated from the rest of the microstructure. Source: Ref 21 Corrosion Fatigue Crack Initiation The influence of an aggressive environment on fatigue...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130043
EISBN: 978-1-62708-284-6
..., with no gross deformation. The fracture surface is usually normal to the main principal tensile stress. Fatigue failures are recognized by the appearance of a smooth, rubbed type of surface, generally in a semicircular pattern. The progress of the fracture (and crack propagation) is generally suggested by beach...