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shearing
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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048403
EISBN: 978-1-62708-226-6
... direction. A zone of heavily deformed grains at the fracture edge was revealed by longitudinal metallographic examination. The shearing fractures of a commercially pure titanium screw and a cast cobalt-chromium-molybdenum alloy were discussed for purpose of comparison. Deformation Surcigal implants...
Abstract
During the internal fixation, the type 316LR stainless steel cortical bone screw failed. Extensive spiral deformation was revealed by the fracture surface. Dimple structure characteristic of a ductile failure mode was observed with dimples oriented uniformly in the deformation direction. A zone of heavily deformed grains at the fracture edge was revealed by longitudinal metallographic examination. The shearing fractures of a commercially pure titanium screw and a cast cobalt-chromium-molybdenum alloy were discussed for purpose of comparison.
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Published: 01 January 2002
Fig. 11 Mechanically forced shearing fracture of type 316LR stainless steel screw. (a) Fracture surface with typical spiral deformation texture. SEM. (b) Close-up of fracture surface with shear dimples oriented in twisting direction. (c) Fracture edge with flow lines. (d) Longitudinal
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in Failures of Jib Tie-Bar Components of Tower Cranes Manufactured from Rimming Steel
> ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment
Published: 01 June 2019
Fig. 18 Brittle fracture produced during shearing operation
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in Shearing Fracture of a Type 316LR Stainless Steel Screw
> ASM Failure Analysis Case Histories: Medical and Biomedical Devices
Published: 01 June 2019
Fig. 1 Mechanically forced shearing fracture of type 316LR stainless steel screw. (a) Fracture surface with typical spiral deformation texture. SEM. (b) Close-up of fracture surface with shear dimples oriented in twisting direction. (c) Fracture edge with flow lines. (d) Longitudinal
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Published: 15 January 2021
Fig. 5 Adhesive wear mechanisms. (a) Adhesive bonding. (b) Plastic shearing. (c) Fracture-induced formation of third-body particles. Adapted from Ref 25
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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001203
EISBN: 978-1-62708-235-8
... Abstract Three bearing bosses from the cover of scrap shears were sent in for examination. They had torn off the base plate to which they had been welded by fillet welds all around. Two of these were examined. They showed entirely the same symptoms. The bosses had broken away on three sides...
Abstract
Three bearing bosses from the cover of scrap shears were sent in for examination. They had torn off the base plate to which they had been welded by fillet welds all around. Two of these were examined. They showed entirely the same symptoms. The bosses had broken away on three sides along the welds. The cleaved fractures in the burned notches propagated partially above and partially below several incipient cracks which may have been fatigue fractures. Metallographic sections showed that the fractures had occurred either at the burned notches near the transition from the weld to the sheet, or else they ran in the sheet material next to the weld. The quality of the welds could not be judged because the opposite fracture pieces to which they adhered had not been sent in. It was concluded that the breakaway of these bosses was at least favored by overheating and hardening.
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001660
EISBN: 978-1-62708-236-5
... Abstract Failure analysis was performed on threaded Ti-6Al-4V fasteners that had fractured in the threads during installation. Scanning electron microscopy (SEM) and optical metallography revealed that the fractures initiated in circumferential shear bands present at the thread roots...
Abstract
Failure analysis was performed on threaded Ti-6Al-4V fasteners that had fractured in the threads during installation. Scanning electron microscopy (SEM) and optical metallography revealed that the fractures initiated in circumferential shear bands present at the thread roots. The fractures propagated by microvoid coalescence typical of that observed in notched tensile specimen fractures of the same material. For comparison, Ti-6Al-4V fasteners from various commercial sources were tested to failure in uniaxial tension and examined in the SEM. In all cases, the fracture appearances were similar to that exhibited by the fasteners that failed during installation. In addition, results of optical microscopy indicated that the geometry and extent of the shear bands appeared to depend on the fabrication process employed by the individual manufacturers. Causes of shear band formation are discussed along with potential methods to eliminate these microstructural in homogeneities.
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in Mechanisms and Appearances of Ductile and Brittle Fracture in Metals
> Failure Analysis and Prevention
Published: 01 January 2002
Fig. 46 Crack propagation in shear bands in a 7075-T6 plate specimen. Shear banding has occurred on four planes of high shear stress (two containing the width direction and two containing the thickness direction). Crack initiation has occurred in multiple locations, including the edge
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Published: 01 January 2002
Fig. 46 Applied shear stress and material shear strength as a function of depth representing types of fatigue damage. (a) No damage. (b) Subsurface-origin, macropitting fatigue. (c) Micropitting or surface-origin macropitting fatigue. (d) Subcase fatigue.
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Published: 01 January 2002
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Published: 01 June 2019
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Published: 15 May 2022
Fig. 7 Viscosity and shear stress versus shear rate for PDMS (polydimethylsiloxane) from rotational rheometry
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Published: 15 January 2021
Fig. 11 Measuring crack depth by a shear-wave technique. (a) Pulse-echo shear wave to crack root. (b) Scan on surface ( x ) and reflection from crack tip. (c) Differences in pulse arrival times shown in A-scan. Defect size estimated from geometry (b) or x shown in (c). Source: Ref 26
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Published: 15 January 2021
Fig. 55 Applied shear stress and material shear strength as a function of depth representing types of fatigue damage. (a) No damage . (b) Subsurface-origin, macropitting fatigue . (c) Micropitting or surface-origin macropitting fatigue . (d) Subcase fatigue
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Published: 01 January 2002
Fig. 28 Spall cavity formed by the action of several shear bands. (a) 7×. (b) 29.5×. (c) 11×. (d) 11×
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Published: 01 January 2002
Fig. 1 Free-body diagrams showing orientation of normal stresses and shear stresses in a shaft and the single-overload fracture behavior of ductile and brittle materials. (a) Under simple tension. (b) Under torsion. (c) Under compression loading. See text for discussion.
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Published: 01 January 2002
Fig. 7 4340 steel rotor shaft that failed by torsional fatigue. (a) Shear groove designed to protect gear mechanism from sudden overload. Dimensions are in inches. (b) Star-shaped pattern on a fracture surface of the shaft. (c) Longitudinal and transverse shear cracks on the surface
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Published: 01 January 2002
Fig. 15 Shear stresses produced by a cylindrical roller below the surface of o bearing raceway. Source: Ref 5
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Published: 01 January 2002
Fig. 26 Fatigue failure of fasteners in single-lop shear carbon-graphite composite joints. (a) Fastener pullout resulting from a static tensile load. (b) Fatigue failure of fasteners initiated by cocking of the fasteners. Both 1 1 3 ×
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Published: 01 January 2002
Fig. 44 Two shear knives made from AISI H13 tool steel. The knives were used to grip hot-rolled bars after rolling so that they could be separated. The knives failed by spalling of the gripping edge after normal service life.
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