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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048026
EISBN: 978-1-62708-224-2
... ). The construction and mechanical properties of the rope were as specified. Fig. 1 Steel wire rope, used on a cleaning-line crane, that failed from fatigue resulting from vibration caused by shock loading. (a) Section of the wire rope adjacent to the fracture. Approximately 1 1 2 ×. (b) Unetched...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0047220
EISBN: 978-1-62708-220-4
... the desired resistance to shock and wear yet retained high strength and good ductility. No further gear failures occurred. The shape of a casting can contribute to residual stresses if it entails sections of markedly different thicknesses, which can undergo different cooling rates in the mold. This effect...
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
... the roots of spline teeth. To find out the cause of fracture of the shaft, a finite element analysis was carried out to predict the stress state of the shaft under steady loading and shock loading, respectively. The steady loading was produced under normal operation, while the shock loading could...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0047846
EISBN: 978-1-62708-218-1
... from shock loading. It was revealed by visual examination that the fracture had initiated in the sharp corner at the bottom of a longitudinal hole which was part of a force feed lubricating system. Beach marks were observed on the fracture surfaces. It was revealed by further examination that the slip...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001295
EISBN: 978-1-62708-215-0
... noted. A close examination of wire that had been flown several times without failure was also made, and dynamic tests were conducted to investigate the fracture characteristics of wire subjected to dynamic loading. It was concluded that dynamic shock loading transmitted by the target during unsteady...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048273
EISBN: 978-1-62708-225-9
... to have failed by tooth-bending fatigue. Spalling was also noted on the pressure (drive) side of each tooth at the toe end which indicated some mechanical misalignment of the pinion with the mating gear that caused the cyclic shock load to be applied to the toe ends of the teeth. Cyclic loads Gear...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006830
EISBN: 978-1-62708-329-4
... the failure analysis of wire ropes and the failure of wire ropes due to corrosion, a common cause of wire-rope failure. Further, it reviews the characteristics of shock loading, abrasive wear, and stress-corrosion cracking of a wire rope. Then, the article provides information on the failure analysis...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001196
EISBN: 978-1-62708-224-2
.... The metallographic examination revealed a rather coarse bainitic structure as shown in Fig. 2 , which is an indication that the resistance of the steel to withstand shock loads was low. Shock loads are unavoidable in the operation of a fork lifter. Impact tests (Charpy-V-Notch) on test specimens with square cross...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047187
EISBN: 978-1-62708-225-9
... of the gears showed severe wear on the side of the teeth that came into contact with the opposing gear during engagement ( Fig. 1 ). This contact point is where high shock loads had to be accommodated at large differences in peripheral speed. The microstructure at the periphery of a worn tooth at its unworn...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001461
EISBN: 978-1-62708-224-2
... in service by overload or shock load conditions. The stress concentration effect of the sharp corner served to increase the stresses developed in this region to a magnitude which sufficed to initiate a crack. It is evident that when the fatigue crack had reached a certain depth, the notch so formed served...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001018
EISBN: 978-1-62708-217-4
..., fresh, and indicative of a shock type of failure pattern. Closer examination, however, showed a fatigue crack at one corner. At this point, there was definite evidence of progression and oxidation. It was concluded that the corner in question was subjected to repeated brinelling resulting from normal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001449
EISBN: 978-1-62708-221-1
...-ductility the plates were liable to fail in a brittle manner at a location where a stress-raiser, such as a crack, was present, particularly under the conditions of shock loading usually experienced by excavating machinery. The importance of the stress-raiser in determining the location of fracture is shown...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001261
EISBN: 978-1-62708-219-8
... and then was welded yet. The bar could withstand mounting and subsequent static loading as long as it was treated with care, as could be expected from the good deformation characteristics of the static tensile test. The question is, however, whether occasional impacts or shocks can be assuredly avoided. This risk...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047315
EISBN: 978-1-62708-225-9
... by shock loads in bending, the roughly symmetrical array of radial cracks leading from the main fracture face suggested that the flange had been subjected to bending. The evidence indicated that the nut had been seated improperly against the roll holder (a result of careless installation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001473
EISBN: 978-1-62708-229-7
... the gearbox was subjected at the time of the accident, the makers made an independent examination of the damaged parts and they also concluded that the failure occurred under conditions of shock loading. They calculated, from the damage to the gearing teeth, that the duration of the shock must have been...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001460
EISBN: 978-1-62708-221-1
... rapid manner without mutual polishing of the surface. The resulting shock load led to rapid failure of one of the welded joints in the other tie bar; that shown in Figure 2 . Subsequent to this mishap the corresponding welds in two other excavators of similar design were examined by ultrasonic...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001811
EISBN: 978-1-62708-180-1
... service. Shock Loading Shock loading of a wire rope can cause it to vibrate, producing high-frequency cyclic bending stresses in the rope. Vibration is most severe at the connection end of the rope, and can result in fatigue failure. Example 2: Fatigue Failure of a Steel Wire Rope Resulting...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001471
EISBN: 978-1-62708-221-1
... under impact but not under slow loading. The material of the body of the hook deformed satisfactorily when the load was applied slowly, but it also tended to behave in a notch-brittle manner under shock loading conditions. It was evident from these tests that the fracture of this hook had not resulted...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001474
EISBN: 978-1-62708-224-2
... to bring about failure in a brittle manner, particularly if, as seems likely, shock loading conditions prevailed at the time of failure. In addition, the material was found to he susceptible to strain-age hardening and, therefore, probably strain-age embrittlement, and it is possible that its notch...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001809
EISBN: 978-1-62708-180-1
... is low, but axial grooves are easier to make. The above discussion relates to a near steady state of bearing operation. In some instances, a shock load may be imposed on a bearing in which an equilibrium fluid film was established. The value of h cannot decrease instantaneously: Time is required...