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chevron cracking

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Published: 01 February 2005
Fig. 18.4 Simulation of chevron cracks and experimental validation [ Hannan et al., 2000 ] More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930189
EISBN: 978-1-62708-359-1
... propagating cracks that travel adjacent to the fusion line in the heat-affected zone. The typical hydrogen crack travels one or two grains from the fusion line in the heat-affected zone. Weld metal hydrogen cracking often takes the form of chevron cracks ( Ref 32 - 34 ). Chevron crack formation...
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...
Image
Published: 01 August 2005
Fig. 2.46 Chevron patterns typical when crack propagation is fastest below the surface. It is also observed in fracture of parts having a thickness much smaller than the length or width (see middle illustration in Fig. 2.47 ). More
Image
Published: 01 December 2018
Fig. 6.171 (a) Close-up view of the tube indicating a transverse crack with irregular contours in the HAZ of the weld. (b) Crack surface view showing chevron marks emanating from the outer surface More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270120
EISBN: 978-1-62708-301-0
... 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 the outer periphery of the half-moon-shaped zone representing fast...
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Published: 30 November 2013
Fig. 2 Sketch of pattern of brittle fracture of a normally ductile steel plate, sheet, or flat 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 More
Image
Published: 01 November 2012
Fig. 20 Sketch of pattern of brittle fracture of a normally ductile steel plate, sheet, or flat 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 More
Image
Published: 01 January 2017
Fig. 17.27 Alternative chevron notch (a) and face groove (b) designs for single-edge cracked specimens More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410315
EISBN: 978-1-62708-265-5
... appear v-shaped, leading to the term chevron cracking to describe this type of fracture. The cracks are in fact axisymmetric, and when a wire breaks, the fracture surface appears conical, a fracture appearance termed cuppy fracture in the wire industry. Fig. 15.12 shows an example of the latter...
Image
Published: 30 November 2013
Fig. 5 Surface of a torsional fatigue crack 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 was about More
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Published: 30 November 2013
are visible because of the continuous testing and that both origins are near the inner edge of the induction-hardened zone. The larger fatigue crack (from A) was in the left third of the fracture before it triggered a brittle fracture in the case (notice the chevron marks at lower right) and ductile fracture More
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Published: 01 August 2005
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. Original magnification 5×; note that fracture nuclei differ in texture from the main More
Image
Published: 01 November 2012
Fig. 4 Fracture of a steel tube. (a) Fracture surface at approximately actual size, showing point of crack initiation (at arrow), chevron and fanlike marks, and development of shear lips. (b) Fracture-origin area at 5×; note that fracture nuclei differ in texture from the main fracture surface More
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Published: 01 November 2012
) Embedded scale from excessive scaling during prior heating operations. (g) Cracks with little or no oxide present on their edges when the metal cools in the mold, setting up highly stressed areas. (h) Seams that develop from elongated trapped-gas pockets or from cracks during working. (i) Laps when More
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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 November 2012
Fig. 24 Fatigue fracture of an 8.25 cm (3.25 in.) diameter 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. Fatigue crack More
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Published: 30 November 2013
of this book.) Fatigue crack A, the larger of the two, propagated through the core and case regions on the left side; then the shaft suddenly fractured in a brittle manner around the right side of the case. Note the chevron marks on the lower right pointing in a clockwise direction toward fracture origin A. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270115
EISBN: 978-1-62708-301-0
.... Discussion The presence of two distinct regions on the fracture surface of the broken dovetail clearly indicates delayed failure. The discolored half-moon-shaped regions represent slow, progressive crack growth, while the brighter regions with chevron marks represent rapid fracture. Intergranular...
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 fracture. In many 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...