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Fatigue striations

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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
... the presence of fatigue striations in the smooth region and dimpling elsewhere. Based on their findings, investigators concluded that fatigue loading initiated a crack in the universal joint that progressed with time and that the final fracture occurred due to bending tensile overload. fatigue crack...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270120
EISBN: 978-1-62708-301-0
... surface indicated that cracking initiated at the outer periphery of the strut and propagated inward until overload fracture occurred. SEM imaging revealed fatigue striations along the outer periphery and dimples elsewhere, indicative of tensile overload. Based on these observations, investigators...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780417
EISBN: 978-1-62708-281-5
.... 2000×. Source: Ref 1 Fig. 6 Schematic of mode I (a) and mode II (b) failure Fig. 7 Fatigue striations in a carbon-fiber composite. 2000× Specimens tested under mode I tension and mode II shear fatigue loading generally result in fracture surfaces that contain fatigue...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430325
EISBN: 978-1-62708-253-2
.... Figure 6.136 shows an SEM image with fatigue striations on the fracture surface, and an optical micrograph showing blunt crack tips. Propagation of some of these cracks through the thickness of the tube gives rise to final fracture. Fig. 6.136 (a) SEM image with fatigue striations on the fracture...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270165
EISBN: 978-1-62708-301-0
.... Under the SEM, the flat region showed well-defined, uniformly spaced fatigue striations ( Fig. CH43.5 ). The slant region showed dimple rupture ( Fig. CH43.6 ). Fig. CH43.4 SEM fractograph showing the slow crack growth (flat) and overload (slant) regions Fig. CH43.5 Well-defined...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270189
EISBN: 978-1-62708-301-0
... of fatigue, which had progressed to about one-third of the vane width; and a final fracture region with tensile overload features ( Fig. CH52.2 ). Examination of replicas of the fracture surface in the SEM did not show fatigue striations. Fig. CH52.2 Fracture surface showing the fatigue and rapid...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270150
EISBN: 978-1-62708-301-0
... from the origin but still within the region of beach marks, the striation appeared much finer and without cracks ( Fig. 36.4 ). The rapid fracture region showed the presence of dimples. Fig. CH36.3 SEM fractograph near the origin showing fatigue striations along with cracking Fig. CH36.4...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270065
EISBN: 978-1-62708-301-0
.... Figure CH1.3 shows the characteristic dimple structure from one of these regions. Immediately adjacent to this region, fatigue striations were observed ( Fig. CH1.4 ). Fig. CH1.3 SEM fractograph of region A of Fig. CH1.1 , close to the rivet hole, showing tearing mode of fracture Fig...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270154
EISBN: 978-1-62708-301-0
... the underside of the rivet hole. A small piece of the sheet metal from this region was cut and examined in the SEM. Fatigue striations were clearly seen ( Fig. CH38.1 ). The fracture on the outer skin region away from the rivet hole up to the leading edge showed reverse slant fracture edge...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270087
EISBN: 978-1-62708-301-0
... found to be normal. Scanning Electron Fractography and Metallography Discussion Conclusion The fracture surface of the failed blade was examined in a SEM. The gross features of the flat area containing beach marks are shown in Fig. CH11.2 . Fatigue striations were observed in this region...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270102
EISBN: 978-1-62708-301-0
... Fig. CH17.9 Wear marks in the bolt holes Fig. CH17.10 Marks resembling erosion tracks with the origin at the bolt hole The failed bolts were examined in a SEM. In each assembly, there were a few bolts with two fracture origins. At the origin, fatigue striations were observed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270138
EISBN: 978-1-62708-301-0
... crack within the blade, indicated by arrow Fig. CH31.3 (a) SEM fractograph showing low-cycle fatigue striations in zone 2. (b) SEM fractograph showing the transition from fatigue to intercrystalline fracture. Arrows indicate the transition. Fig. CH31.4 SEM fractograph of region 3...
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...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610147
EISBN: 978-1-62708-303-4
... Fig. 30 Fatigue crack propagation. Source: Ref 17 Fig. 31 Scanning electron micrograph showing fatigue striations. Source: Ref 2 Fig. 29 Transition from stage I to stage II fatigue. (a) Highly enlarged schematic cross-sectional sketch. The edge of the metal is at left. When...
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
... on Fatigue: Striations and Their Measure , Journal of Failure Analysis and Prevention , Vol 10 ( No. 2 ), April 2010 , p 120 – 137 10.1007/s11668-009-9320-4 3. Miner M.A. , Estimation of Fatigue Life with Particular Emphasis on Cumulative Damage , Metal Fatigue , Sines G...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270180
EISBN: 978-1-62708-301-0
... the fatigue zone, were found on the fracture surface ( Fig. CH49.1 ), the crack initiating at a thread root and extending to about 20% of the cross section. Fig. CH49.1 Fracture surface of the failed stud showing the fatigue zone Under the SEM, fatigue striations were seen in the region of beach...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270156
EISBN: 978-1-62708-301-0
... ). The section thickness had reduced considerably at these locations. Fig. CH39.3 SEM of the inside surface of the skin at the cracked region showing localized pitting Away from this region, the fracture surface showed striations, indicating crack propagation by fatigue ( Fig. CH39.4 ). To find...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.9781627083010
EISBN: 978-1-62708-301-0
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270072
EISBN: 978-1-62708-301-0
.... CH4.2 , as further proof of fatigue crack propagation. The microstructure and hardness did not reveal any abnormalities in the material. Fig. CH4.4 SEM photograph showing fatigue striations At the time of the last overhaul, the component had served 290 hours. It was reported...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130351
EISBN: 978-1-62708-284-6
...× A scanning electron microscope (SEM) was used to examine the fracture surfaces and to document the mode of failure. Figure 5 shows the fracture topographies of the primary fracture in the strain bar. The secondary fractures in the strain bar are shown in Fig. 6 . Fatigue striations emanated from fatigue...