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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...
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...
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Published: 01 June 2019
Fig. 3 These shear lips have shear lips of their own. More
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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 More
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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. More
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Published: 01 January 2002
Fig. 23 Shear displacement of a spall prior to complete separation along the shear band. 330× More
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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 More
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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 More
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Published: 15 May 2022
Fig. 7 Viscosity and shear stress versus shear rate for PDMS (polydimethylsiloxane) from rotational rheometry More
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...
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Published: 01 June 2019
Fig. 1 Micrograph showing shear failure of a resistance plug weld (1× magnification) More
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Published: 01 June 2019
Fig. 9 Electron micrographs of the shear band regions of the pins tested to failure for comparison. The manufacturer A shear band (a) is at a much lower angle to the pin axis than the other manufacturer's shear band (b). More
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Published: 01 June 2019
Fig. 8 Maximum shear stress as a function of displacement for two spring heights. The compressor that exhibited failures had a spring height of 25.0 mm. Lowering the compressor weight reduces the height, thus lowering the maximum stress as a function of lateral displacement. The fatigue bench More
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Published: 01 June 2019
Fig. 6 Adiabatic shear (a) eminating from white-etch layer (c). Note variation of microhardness indentations as they proceed into the white-etching layer. Etched in 2% nital. More
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Published: 01 June 2019
Fig. 7 Network of adiabatic shear deformation resulting from complex stress state in the gun during detonation. Etched in picral. More
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Published: 01 June 2019
Fig. 8 Microhardness indentations (10gf load) in a region of adiabatic shear. A light unresolved substructure is apparent in the shear band. Etched in 2% nital. DIC illumination. More
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Published: 01 June 2019
Fig. 5 Lower magnification SEM of the bolt fracture surface. The shear lip (final overload) is denoted by the arrow. Although the fracture surface was characterized completely by microvoid coalescence, a “ratcheting” effect (suggestive of cyclic crack growth or a somewhat discon-tinuous More
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Published: 01 June 2019
Fig. 1 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 More
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Published: 01 June 2019
Fig. 4 Showing shear fracture of weld metal and root defects. More
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Published: 01 June 2019
Fig. 6 Appearance of surface of major crack after breaking open. Note shear lip adjacent to inside surface (top of photograph). More