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striation spacings

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270102
EISBN: 978-1-62708-301-0
... bolts with two fracture origins. At the origin, fatigue striations were observed with an average spacing of 2.5 μm ( Fig. CH17.11 ). At other places on the same fracture surface, striations were also observed with an average spacing of 0.4 μm. The bolts with double fracture origins showed dimple rupture...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270143
EISBN: 978-1-62708-301-0
... fractograph at the fatigue crack origin Fig. CH33.6 SEM fractograph showing two fatigue cracks At higher magnifications, striations typical of fatigue were observed ( Fig. CH33.7 ). Examination revealed wide variations in striation spacing as well as localized change in the direction...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270025
EISBN: 978-1-62708-301-0
... of the material through metallography Path of fracture Mode of fracture Length of the crack that preexisted and propagated by fatigue Length of the fatigue crack before it became critical Presence of inclusions, pits, or other flaws at the origin Striation spacing of the fatigue crack...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130503
EISBN: 978-1-62708-284-6
... of weld defects such as undercut or porosity present in the section. Scanning electron microscopy showed fine striations within the beach mark areas of the pipe. The SEM showed a ductile dimpling structure within the brightly colored band of the fracture surface. Energy-dispersive spectroscopy...
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
.... The exact process is still being studied, but for practical purposes, the above description is adequate. Electron micrographs of striations in forged titanium alloys are shown in Fig. 5 and 6 . Note the range of striation appearance and spacing and the slight curvature of the striations as opposed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060385
EISBN: 978-1-62708-261-7
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850410
EISBN: 978-1-62708-260-0
... of Grain Density in Space-Filling Geometries from Measurable Two-Dimensional Parameters, ” Acta Metall. , vol. 27 , 1979 , pp. 515 – 521 . 10.1016/0001-6160(79)90003-8 61. Vander Voort G. F. : “ Inclusion Measurement, ” Metallography as a Quality Control Tool , Plenum Press, Plenum...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540297
EISBN: 978-1-62708-309-6
.... That is, for a given stress cycle, the microscopic striation spacing and the macroscopically measured da/dN should have the same magnitude. Fig. 7.18 Fatigue striations in PMMA. Arrow indicates crack growth direction. Source: Ref 7.27 Figure 7.19 shows comparisons for striations in three types...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540121
EISBN: 978-1-62708-309-6
... yield. If crack initiation occurs at locations on two closely spaced parallel planes, then the cracks eventually join to form a steplike feature or ratchet mark ( Fig. 3.13 ). The mechanisms of fatigue crack initiation have been studied with highly homogeneous, single-phase metals (without...
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
... of the crack that produce, within the grains, striations that are parallel to the crack front. The process of fatigue consists of three stages: Stage I: Initial fatigue damage leading to crack nucleation and crack initiation Stage II: Progressive cyclic growth of a crack (crack propagation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270165
EISBN: 978-1-62708-301-0
... ( Fig. CH43.4 ). These features indicated progressive failure. 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270150
EISBN: 978-1-62708-301-0
... spaced striations near the origin with cracks running parallel to the striations ( Fig. CH36.3 ). Away 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540215
EISBN: 978-1-62708-309-6
... striation spacing due to the load amplitude A4-B1, preceded by three smaller striations corresponding to the load cycles of block A. The arrow indicates the crack propagation direction. Source: Ref 5.39 In this example, a loading block contains a total of 24 constant-amplitude stress cycles. All 24...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610327
EISBN: 978-1-62708-303-4
... and glasses, are not fatigue striations, nor are they true crack front markings. They form when reflected stress waves intersect a propagating crack. The curved crack front appearance of these markings is another useful feature that helps to locate the fracture origin, which is on the concave side...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090257
EISBN: 978-1-62708-266-2
... and Trevena to conclude that SCC occurred by a very localized microvoid-coalescence process, rather than by cleavage. Very fine, parallel striations, spaced approximately 1 μm or less apart, have been observed during transmission electron microscopy (TEM) examination of transgranular SCC fracture surfaces...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270067
EISBN: 978-1-62708-301-0
... principally along the grain boundaries normal to the major stress axis of the blade. The progress of the crack in the second zone is purely by transgranular mode. The incremental crack growth is evidenced by the presence of closely spaced striations. Therefore, it appears that the crack initiated...
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 December 2003
DOI: 10.31399/asm.tb.cfap.t69780404
EISBN: 978-1-62708-281-5
... wall, where compressive residual stresses may be dominant. Fig. 29 Reflected-light optical micrograph of the fracture surface of medium-density polyethylene pipe. Arrows indicate the direction of crack propagation. Concentric circular striations originate from the crack starter and grow...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270031
EISBN: 978-1-62708-301-0
... on the fracture surface and when there is a one-to-one correspondence between such features and the load cycle, the crack growth rate can be readily determined from striation spacing. In stress-corrosion cracking (SCC), repeated formation and fracture of the corrosion product layer at the crack tip may produce...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030117
EISBN: 978-1-62708-282-2
... and Space Administration, 1974 15. Waterhouse R.B. , The Fretting Wear of Nitrogen-Bearing Austenitic Stainless Steel at Temperatures to 600 °C , Trans. ASME , Vol 08 , p 359 – 363 10.1115/1.3261201 16. Taylor D.E. , Fretting Fatigue in High-Temperature Oxidizing Gases...