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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
... 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 Ultrasonic cleaning has been known for years to have...
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
... 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 an essentially corrosive...
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 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, temperature...
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
... they are subjected to virtually continuous low-level vibration. This suggests that if the intensity of the vibration is below the material's fatigue “threshold” (K th ), fatigue damage does not accumulate in the joint. [1] This K th is a property of the particular material and varies with the metallurgical...
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
... was damaged; therefore, the amplitude of vibration was increased in the unit and marriage bolts were broken one by one. Finally, the rotor was separated and the journal shaft no. 1 was damaged. Case 3: Failure originated from the journal shaft no. 1. We assumed that the journal shaft no. 1 was damaged...
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 Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006758
EISBN: 978-1-62708-295-2
... 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 to determine...
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
... the result of external vibration, but in many cases, it is the consequence of one of the members of the contact being subjected to a cyclic stress (that is, fatigue), which gives rise to another and usually more damaging aspect of fretting, namely the early initiation of fatigue cracks. This characteristic...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006936
EISBN: 978-1-62708-395-9
...-transmission technique is also extremely useful for detecting disbonds, core damage, and moisture intrusion in sandwich structures (parts with a honeycomb or foam core surrounded by laminate face sheets). Pulse echo Pulse-echo ultrasonic inspection provides the most information about the material...
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
... 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 the remaining life...
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
... was probably compounded by system vibration. The hydraulic pressure was not constant, as it varied with the changing load on the boiler. Although cavitation was observed macroscopically on the impeller, SEM fractography did not reveal any association between the fracture and the cavitation damage. EDX analyses...
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
... Abstract Factors which may lead to premature roller bearing failure in service include incorrect fitting, excessive pre-load during installation, insufficient or unsuitable lubrication, over-load, impact load vibration, excessive temperature, contamination by abrasive matter, ingress of harmful...
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
... is usually the result of external vibration, but in many cases, it is the consequence of one of the members of the contact being subjected to a cyclic stress (that is, fatigue), which gives rise to another and usually more damaging aspect of fretting fatigue or contact fatigue. Fatigue cracks...
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
... More than half of all metallic springs that fail in testing or service do so by a fatigue mechanism. Many times, the fatigue crack is initiated by preexisting defects or cracks, corrosion, wear, or mechanical damage. However, in the majority of cases, there is no significant identifiable cause...
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 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.a0006834
EISBN: 978-1-62708-329-4
... bearings are also explained. Finally, the article discusses in detail the characteristics and prevention of the various types of failures of REBs: wear, fretting, corrosion, plastic flow, rolling-contact fatigue, and damage. The article includes an Appendix, which lists REB-related abbreviations...
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.a0006756
EISBN: 978-1-62708-295-2
... mechanisms that can result in a fatigue damage mode must be examined. Examples include corrosion fatigue, thermomechanical fatigue, vibrationally induced fatigue, creep-fatigue interaction, and fatigue induced only by mechanical cyclic stresses. Determination of damage mechanisms starts by characterizing...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003521
EISBN: 978-1-62708-180-1
... for proper strength, surface finish, assembly, and operation. Prior damage by mechanical or corrosion modes may have initiated cracking. Alignment, vibration, balance High cycle low stress: large fatigue zone; low cycle high stress: small fatigue zone Attack morphology and alloy type must...
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...