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chevron cracking

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Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002485
EISBN: 978-1-62708-194-8
... considerations in applying a deformation process. Some fundamental aspects of plastic flow, flow stress, cold and hot working, workability, and formability are presented. The article provides information on free-surface cracking, central burst or chevron cracking, and cracking on die contact surface, as well...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001471
EISBN: 978-1-62708-173-3
... 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 , 33 , 34 ). Chevron crack formation and propagation are influenced by the combination...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006835
EISBN: 978-1-62708-329-4
...: for example, internal bursts or chevron cracks, cracks on free surfaces, cracks on die-contacted surfaces Metal-flow-related problems: for example, inhomogeneous grain size; shear bands and locally weakened structures; cold shuts, folds, and laps; flow-through defects and improper grain flow Poor...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004021
EISBN: 978-1-62708-185-6
.... Fracture Prediction Chevron Cracks Forward extrusion is a process used extensively in the automotive manufacturing industry. Certain extruded components, such as axle shafts, are considered critical for safe operation of the vehicle and must be free of defects. During the mid-1960s, automotive...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005539
EISBN: 978-1-62708-197-9
... die moves in a downward direction Fig. 45 Two-dimensional flownet of a single tooth in a bevel-gear forming process. The bottom die moves in an upward direction Fracture Prediction Chevron Cracks Forward extrusion is a process used extensively in the automotive manufacturing...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
..., internal bursts or chevron cracks, cracks on free surfaces, cracks on die-contacted surfaces Metal-flow-related problems: for example, end grain and poor surface performance; inhomogeneous grain size; shear bands and locally weakened structures; cold shuts, folds, and laps; flow-through defects...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006385
EISBN: 978-1-62708-192-4
... contact length, as illustrated in Fig. 9 . The h - L ratio also is an important parameter; the higher this ratio, the more inhomogeneous is the deformation. Fig. 9 Examples of defects in extrusion. (a) Chevron cracking in round steel bars during extrusion. Unless the part is inspected...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006534
EISBN: 978-1-62708-207-5
... fracture, and chevron cracking, can develop at the center of an extruded and drawn product ( Fig. 1 ). They occur when the center of the billet is not in a fully plastic state and are attributed to a state of hydrostatic tensile stress at the centerline of the deformation zone in the die. The various types...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003258
EISBN: 978-1-62708-176-4
... subjected to high levels of triaxial (hydrostatic) tensile stresses. Center-burst (chevron) cracking of solid rods in drawing and extrusion, plane-strain drawing of sheet or plate, and tube drawing or spinning are due to the high hydrostatic tensile stress component at the centerline of the workpiece during...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002380
EISBN: 978-1-62708-193-1
... starting K -value for a given environmental exposure. This prevents fatigue damage or residual compressive stress at the crack tip, which may alter the fracture toughness behavior, particularly when testing at a K -level near the K Q value for the specimen. Chevron notches are sometimes used...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000606
EISBN: 978-1-62708-181-8
... surface in Fig. 173 , displaying clearly the two dark arc-strike crescents that are indicated in both views by arrows at the top edge of the fracture surface. Chevron marks pointing to these crescents (which are the crack nuclei) are visible both here and in Fig. 171 . ∼0.9× Fig. 176 Polished...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003312
EISBN: 978-1-62708-176-4
... 1421. SCF, surface crack in flexure; SEPB, single-edge precracked beam; CNB, chevron notched beam In the case of the single-edge precracked beam (SEPB) test specimen, prior to fracture testing, a compression bridge anvil is used with the 3 by 4 mm (0.12 × 0.16 in.) cross section “bend bar” test...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003311
EISBN: 978-1-62708-176-4
... intensities have to be estimated using numerical methods at both very short and very long crack lengths ( Ref 65 ). Fig. 9 Schematic sketch of the Browne/Chandler test geometry. Adapted from Ref 65 Chevron Notch Methods (CHV) The chevron notch is used in three specimens ( Ref 58 , 66...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001834
EISBN: 978-1-62708-181-8
... rail. The fracture origin is not on the section shown. Fig. 40 Schematics showing a model for chevron crack formation. (a) Crack front propagation model. (b) Crack front at any given time. (c) Analogy between chevron formation in plate and cup-and-cone fracture. Source: Ref 108 Fig...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003720
EISBN: 978-1-62708-177-1
..., quench cracks Radial marks and chevrons (V-shape) • Point toward crack initiation site • Show crack propagation direction Crack arrest lines (monotonic loading) (U-shape) • Lines point in direction of crack propagation • Indicate incomplete constraint Crack arrest lines (cyclic loading) (beach...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001820
EISBN: 978-1-62708-180-1
... propagation: brittle and ductile. Figure 1 shows a brittle, or cleavage, fracture. As shown in Fig. 1(a) , brittle fractures in pipelines exhibit herringbone or chevron markings on the fracture surface. These markings are continuous and relatively uniform. This fracture pattern is produced because...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001347
EISBN: 978-1-62708-173-3
.... , and McMeeking R.M. , “A Test for Determining the Fracture Resistance of Bimaterial Interfaces,” Report M87-4, Materials Department, College of Engineering, UC Santa Barbara 2. Suo Z. and Hutchinson J.W. , “Interface Crack Between Two Elastic Layers,” Report MECH-118, Division...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006774
EISBN: 978-1-62708-295-2
... and shear lips present on fracture surface Crack propagation direction parallel to shear lips Mixed-mode fracture (incomplete constraint) Tightly closed crack on surface Possible cyclic loading Possible processing imperfection, e.g., from shot peening, quench cracks Radial marks and chevrons (V...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003227
EISBN: 978-1-62708-199-3
... (and conversely, the direction toward the origin), such as chevron marks, crack branching, and river patterns, have been treated earlier in this Section. Type of Loading The design of a part anticipates a specific mode of loading in service. Whether or not loading was as expected is of prime concern...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003537
EISBN: 978-1-62708-180-1
... propagation direction parallel to shear lips Mixed-mode fracture (incomplete constraint) Tightly closed crack on surface Possible cyclic loading Possible processing imperfection, e.g., from shot peening, quench cracks Radial marks and chevrons (v-shape) Point toward crack initiation...