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Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270141
EISBN: 978-1-62708-301-0
... well-defined chevron marks along the fracture surface that end in a shear lip on the convex side. Further examination using a SEM shows that the failure was due to overload. Based on these observations and the results of tensile testing and microstructural analysis, investigators concluded...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270120
EISBN: 978-1-62708-301-0
.... Fig. CH23.2 Fracture surface of the failed starboard strut Figure CH23.3 shows three distinct zones in region A: (a), a half-moon-shaped region with beach marks typical of slow crack growth extending inward to a depth of 2 mm from the periphery; (b), a region of chevron marks emanating from...
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
... instances, the origin is apparent even to the naked eye. Once a crack is initiated, then during the propagation of the crack, other features such as radial lines, chevron marks, and beach marks develop and are left behind. A ductile tensile fracture in a component of circular cross section consists...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630081
EISBN: 978-1-62708-270-9
... on the fracture surface frequently, but not always, point back to the location from which the fracture originated. In the case of flat steel, such as sheet, plate, or flat bars, and also case-hardened regions, there are characteristic V-shaped “chevron” or “herringbone” marks that point toward the origin...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270115
EISBN: 978-1-62708-301-0
... failure and a region of rapid fracture with clearly delineated chevron markings ( Fig. CH21.2 ). The extent of the half-moon-shaped region varied among the fractured dovetails. The half-moon-shaped regions were considerably corroded and were dark brown in color compared with the light gray color...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610055
EISBN: 978-1-62708-303-4
... bar. Note the classic chevron or herringbone marks that point toward the origin of the fracture, where there usually is some type of stress concentration, such as a welding defect, fatigue crack, or stress-corrosion crack. The plane of the fracture is always perpendicular to the principal tensile...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610549
EISBN: 978-1-62708-303-4
... Fig. 3 Surface of a fatigue fracture in a 4330V steel part. Chevron marks point to origin of fatigue in lower left corner. Arrows identify shear rupture along the periphery. Source: Ref 1 Fig. 4 Fracture of a steel tube. (a) Fracture surface at approximately actual size, showing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430351
EISBN: 978-1-62708-253-2
... surface view showing chevron marks emanating from the outer surface Fig. 6.172 (a) Parent metal microstructure of tempered martensite, 200×; microstructures (b) 400× and (c) 200× are of the outer edge and HAZ consisting of martensite with acicular needles Fig. 6.173 Microhardness...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180151
EISBN: 978-1-62708-256-3
... on fatigue fracture beach marks reveals the direction of shaft rotation during operations Fig. 4 (a) Fracture surface of a steel tube, at approximately actual size, showing point of crack initiation (at arrow), chevron and fanlike marks, and development of shear lips. (b) Fracture-origin area...
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
.... 6.141b ). Low-magnification examination of the fracture surface highlighted the presence of chevron marks and the brittle nature of the rupture contours on the coarse fracture surface, with crack initiation from the inner surface ( Fig. 6.138b ). Scanning electron microscopy analysis...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130043
EISBN: 978-1-62708-284-6
... through the SEM. (c) Microvoid coalescence (dimples) Fig. 12 Chevron markings point back to the origin of failure in brittle steels. Source: Ref 19 Fig. 13 Cleavage fracture in a low-carbon steel, seen through an SEM. Cleavage fracture in a notched impact specimen of hot-rolled 1040...
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
.... Fig. 34 Torsional fatigue fracture of a 1050 steel axle shaft induction-hardened to about 50 HRC. The arrow indicates the longitudinal shear fatigue origin, which then changed direction and grew to the small circular beach mark, or “halo.” Final brittle fracture (note chevron marks in the case...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130351
EISBN: 978-1-62708-284-6
... at the discolored region. Chevron marks were evident that indicated the crack propagated away from the ends of the discolored region, terminating at an area diametrically across from it, as shown in Fig. 35(b) . The discolored region extended along the circumference of the axle for a cord distance of 22.15 mm...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.9781627083010
EISBN: 978-1-62708-301-0
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
... in . Compute the life of the part. The macroscopic fracture appearance will depend on part geometry, type of loading, and stress level. Typical fracture appearances are shown in Fig. 38 and 39 . The second characteristic of a fast fracture zone is chevron marks that point back to the origin...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040237
EISBN: 978-1-62708-300-3
... for vehicle safety and must be free of defects. These defects could be visible external ones, such as laps or cracks, or nonvisible internal defects, such as chevron cracking ( Fig. 18.2 ) [ Hannan et al., 2000 ]. Fig. 18.2 Automotive axle shaft with chevrons [ Hannan et al., 2000 ] Spherical...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540047
EISBN: 978-1-62708-309-6
... for the engineering stress-strain curve is the average linear strain, which is obtained by dividing the elongation (the amount of extension) by the original gage length that was marked on the specimen: (Eq 2.2) ε = ( l − l 0 ) / l 0 where ε is the average linear strain (also known...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060385
EISBN: 978-1-62708-261-7
..., illustrating adjacent regions of ductile fracture and intergranular stress-corrosion cracking (SCC). Courtesy of Marcus Brown, NDE Technology Inc. Fig. 16.12 Area marked for contour adjustment just upstream of cavitation damage on a turbine blade. Source: Ref 16.2 Fig. 16.14 Creep damage...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720321
EISBN: 978-1-62708-305-8
..., or other conditions that may nullify acceptability of the material. The term also encompasses such terms as pipe, porosity, laminations, slivers, scabs, pits, embedded scale, cracks, seams, laps , and chevrons , as well as blisters and slag inclusions in hot rolled products. For products...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910475
EISBN: 978-1-62708-250-1
... of failure/damage (e.g., beach markings on fatigue fracture surfaces, chevron markings on brittle fracture surfaces) May be carried out on site. Whole sample/plant may be examined. Photographic recording possible. Requires no specialized equipment Low resolution of damage initiation/mechanism(s), etc...