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torsional overload

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001792
EISBN: 978-1-62708-241-9
... beach marks, suggesting rotary-bending fatigue. The fracture surfaces on the clutch shaft exhibited a star-shaped pattern, suggesting that the failure was due to torsional overload which may have initiated at corrosion pits discovered during the examination. Based on the observations, it was concluded...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001733
EISBN: 978-1-62708-225-9
...Abstract Abstract Drive cables from a rubber processing machine were failing in less than 8 h of operation, the expected service life being much greater than 100 h. Comparison cables were tested to failure under known stress conditions, including tensile overload, torsional loading, reversed...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001802
EISBN: 978-1-62708-241-9
... microscopy strain nitinol (nickel-titanium shape memory alloy) UNS N01555 Introduction Experimental Tensile Overload Torsional Overload Fatigue Hydrogen Embrittlement Compressive Damage Kinking Failures Conclusions Acknowledgments References References 1. Gall K...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001119
EISBN: 978-1-62708-214-3
... on the ID of the coil and then proceeded perpendicularly to the longitudinal axis of the wire toward the wire center. The crack then propagated approximately along the axis of the wire in a manner representative of torsional overload. Fig. 1 Closeup view of one fracture surface. A secondary...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001094
EISBN: 978-1-62708-214-3
... was brittle in the type 410 screws. Bright, lower left area was shear fracture from torsional overload during retorquing. Surface Examination Metallography Simulation Tests Fractographic and metallographic examinations clearly showed that the fractures had occurred in a brittle manner from...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0091096
EISBN: 978-1-62708-234-1
... groove in the shaft had performed its function, but at a lower overload level than intended. Recommendations included increasing the fatigue strength of the shaft by shot peening the shear groove to minimize chatter. Shafts (power) Shot peening Torsional fatigue 4340 UNS G43400 Fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001810
EISBN: 978-1-62708-241-9
...Abstract Abstract Several torsion bars had failed in a projectile weaving machine and were analyzed to determine the cause. Specimens prepared from the damaged components were subjected to visual inspection, hardness testing, chemical analysis, and metallurgical evaluations. The failed torsion...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001805
EISBN: 978-1-62708-241-9
... with ductile overload ( Fig. 8 ). The coil wire exhibited a flat fracture surface with circumferentially oriented features and microvoid coalescence at the center, consistent with ductile fracture due to torsional overload, as shown in Fig. 10 . Given that the core wire is significantly larger and stiffer...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001368
EISBN: 978-1-62708-215-0
... to the No. 1 runner by rapid brittle fracture caused by bending, probably as the shaft went through the casing. Subsequently, the second shaft failed adjacent to the No. 3 runner by torsional overload, probably when the first shaft separated and jammed the No. 2 runner. The turbine was almost completely...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001230
EISBN: 978-1-62708-236-5
... Torsional fatigue Surface-hardened steel Fatigue fracture A crankshaft which was overloaded on a test stand suffered an incipient crack in the crank pin ( Fig. 1 ). The crack run generally parallel to the longitudinal axis and branched off at the entrance into the two fillets at the transition...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001763
EISBN: 978-1-62708-241-9
.... splined shaft fatigue fracture transient torsional overloading medium carbon steel spline teeth deformation stress analysis fracture toughness SAE/AISI 1045 (medium-carbon alloy steel) UNS G10450 Introduction Visual Examination Stress Analysis Conclusions References References...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006836
EISBN: 978-1-62708-329-4
... was reduced enough for final propagation by torsional overload. The presence of the residual tensile stress on the spring inside diameter could be due to insufficient stress relief after coiling the spring. Indeed, when one of the failed springs was examined for the presence of residual tensile stress, fairly...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006760
EISBN: 978-1-62708-295-2
... (a) Before and (b) after cleaning with acetone pressure-sensitive film to remove corrosion products How the stress is applied to the component influences the features associated with the damage event. Tensile, shear, impact, and torsion have different identifying features. Tensile Overload...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0091092
EISBN: 978-1-62708-224-2
... hub. Investigation (visual inspection, inspection records review, optical and scanning electron microscopy, and fractography) supported the conclusion that the fracture mode for both shafts was low-cycle rotating-bending fatigue initiating and propagating by combined torsional and reverse bending...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006810
EISBN: 978-1-62708-329-4
.... Original magnification: 100× 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...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006776
EISBN: 978-1-62708-295-2
.... Fatigue crack at left of arrows is flat and perpendicular to side surfaces (note absence of beach marks in this laboratory fatigue fracture). Overload fracture to right of arrows has 45° shear lips extending upward at the top side of the sample and downward at the bottom side. Fig. 14 Fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001800
EISBN: 978-1-62708-241-9
...Abstract Abstract An electric transport vehicle, similar to an electric trolley or subway rail car, experienced frequent breakdowns due to in-service fractures of torsion springs that support the weight of an overhead electric pickup assembly. Scanning electron microscopy and metallographic...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
... shows simplified, two-dimensional, free-body diagrams illustrating the orientations of the normal-stress and shear-stress systems at any internal point in a shaft loaded in pure tension, torsion, and compression. Also, the single-overload fracture behavior of both ductile and brittle materials...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001672
EISBN: 978-1-62708-236-5
...) that was the source of each crack. The fracture of the oil quenched and tempered (HRC 50 ASTM A229) spring was by stress-corrosion cracking after the crane fell into the sea because fatigue cannot account for the fractures observed. The crane failure was caused by an overload created by the operator catching a free...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003539
EISBN: 978-1-62708-180-1
... (initiation sites), a region of progressive fatigue crack propagation, and a final fast overload fracture zone. Identification of the location and nature of origin sites is important in failure analysis of fatigue, as fatigue crack initiation is frequently the life-controlling step in the failure process...