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ultrasonic vibration damage

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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.c9001841
EISBN: 978-1-62708-241-9
... stents fracture ultrasonic vibration damage stainless steel nitinol striations beach marks SEM analysis natural frequency 316L (austenitic wrought stainless steel) UNS S31603 nitinol (nickel-titanium shape memory alloy) UNS N01555 Background Case Study 1: 316L Stainless Steel Stent...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001470
EISBN: 978-1-62708-220-4
...Abstract Abstract One 49-in. impeller of a two-stage centrifugal air compressor disrupted without warning, causing extensive damage to the casings, the second impeller, and the driving gear box. Prior to the mishap, the machine had run normally, with no indications of abnormal vibration...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001486
EISBN: 978-1-62708-234-1
... the effects of cavitation by vibrations induced by ultrasonic or other transducers. Although cavitation damage appears to result basically from a mechanical cause, the exact mechanism is not entirely clear and two schools of thought have developed, one supporting an essentially erosive, and the other...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001594
EISBN: 978-1-62708-229-7
... to cyclic stress that produces stress intensity below the “fatigue threshold” can be expected to last indefinitely. Remember that every time a component is exposed to a stress that causes crack propagation that component is now susceptible to damage from lower intensity vibrations. If a fatigue-induced...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
... by corrosive fluids. (a) Drawn cup for a needle-roller bearing damaged by vibration in the presence of dirt and moisture. Roller spacing is indicated by polished indentations. (b) and (c) Corrosion or water etch on bearing components resulting from a defective seal in a grease-lubricated bearing application...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001830
EISBN: 978-1-62708-241-9
... and finally the journal shaft no. 1 was broken by an overload. Case 2: Failure originated from the second stage bucket. In this case, initially one of the second stage buckets was damaged; therefore, the amplitude of vibration was increased in the unit and marriage bolts were broken one by one. Finally...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001569
EISBN: 978-1-62708-229-7
..., and/or changes in maintenance. Nondestructive inspections by visual, magnetic particle, ultrasonic, and radiographic methods for detecting and monitoring damage are discussed. These failures are presented to provide hindsight that will help others in increasing the success rate for anticipating and analyzing...
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
... image of cracks from other locations on the nitinol stent The frequency of the ultrasonic cleaning excited resonance at the natural frequency of the stent and initiated a fatigue crack. At and near resonance, relatively small energy input can result in large vibration amplitudes. These large...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001084
EISBN: 978-1-62708-214-3
... practice to balance the impeller prior to installation by grinding selected areas. The grinding marks are visible in Fig. 1(a) and (b) on surfaces A and C. Fig. 1 As-received fractured second-stage impeller. (a) Overview of damaged impeller showing the fracture surface (FS) and groups 1 and 2...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006758
EISBN: 978-1-62708-295-2
...Abstract Abstract The goal of using nondestructive evaluation (NDE) in conjunction with failure analysis is to obtain the most comprehensive set of data in order to characterize the details of the damage and determine the factors that allowed the damage to occur. The NDE results can be used...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003524
EISBN: 978-1-62708-180-1
... of samples Preliminary examination of the failed part (visual examination and record keeping) Nondestructive testing These preliminary steps may then be followed by assessment of the damage and conditions leading to failure. These stages may differ depending on whether fracture, corrosion...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006834
EISBN: 978-1-62708-329-4
..., such as bearing or gear materials, sand, or machining chips. Fig. 31 Bearings that were damaged by corrosive fluids. (a) Drawn cup for a needle-roller bearing damaged by vibration in the presence of dirt and moisture. Roller spacing is indicated by polished indentations. (b, c) Corrosion or water etch...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006764
EISBN: 978-1-62708-295-2
...-particle inspection radiography surface discontinuities surface inspection ultrasonic inspection NONDESTRUCTIVE TESTING (NDT), also known as nondestructive evaluation (NDE), includes various techniques to characterize materials without damage. The methods of NDE involve dimensional metrology...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001485
EISBN: 978-1-62708-225-9
...” which is related to the form of damage detailed under ( b ) but which arises from a different cause. It does not occur during normal running, but is found in bearings of plant which is subjected to vibrations while at rest. In the example shown in Figure 16 , fairly deep grooves having a corroded...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001828
EISBN: 978-1-62708-241-9
...Abstract Abstract A heat transport pump in a heavy water reactor failed (exhibiting excessive vibration) during a restart following a brief interruption in coolant flow due to a faulty valve. The pump had developed a large crack across the entire length of a bearing journal. An investigation...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006822
EISBN: 978-1-62708-329-4
..., and vibration. Nondestructive Examination Destructive Examination Pipelines can leak and rupture for numerous reasons. Some of these reasons are related to manufacturing, fabrication, or repair/remediation issues, whereas others are related to damage mechanisms that occur during service. Table 1...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001459
EISBN: 978-1-62708-234-1
....a0003539 In carrying out an investigation into the cause of breakdown of some engine or machine that has been damaged or wrecked while working, it is essential to be able to recognize a fatigue failure of some component part. The ability to interpret the various features exhibited...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001731
EISBN: 978-1-62708-217-4
... is parked or taxiing or being towed, and not during landing when the gear may be subjected to extremely high shock and vibration loads. Many of the failures have been attributed to stress-corrosion or to “delayed” fracture starting in areas where the surface had been damaged. Either mechanical...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006829
EISBN: 978-1-62708-295-2
... Fig. 1 Example of fretting and related visible imprint on the main bearing shell. Adapted from Ref 10 . Reprinted with permission from MAN Energy Solutions Fig. 2 Fatigue crack generated by fretting damage in a rivet hole and fastened assemblies. Bottom two images reprinted from...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003562
EISBN: 978-1-62708-180-1
... damage that occurs in machine components such as ball bearings, where craters caused by the vibration of the ball against the race are circular and resemble Brinell impressions. Another type of fretting damage observed in machinery is known as fitting rust , where gages or shims are clamped together...