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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
...Abstract Abstract Ultrasonic cleaning is widely used in the production of medical devices such as guide wires and vascular implants. There are many cases, however, where cleaning frequencies have been close to the natural frequency of the device, producing resonant vibrations large enough...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001082
EISBN: 978-1-62708-214-3
... were also constructed. It was determined that the blades failed by fatigue that had been accelerated by stress-corrosion cracking. The mechanism of failure was flow-induced vibration, in which the vortex-shedding frequencies of the blades were attuned to the natural frequency of the blade/hub...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001551
EISBN: 978-1-62708-233-4
... were ground. It was found that the natural frequency of the wheel truing device was the culprit. A tuned damped absorber was designed and built to modify the resonance. This eliminated the problem. Grinding machines Printing press rolls Shafts (power) Vibration analysis Structural steel...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001052
EISBN: 978-1-62708-214-3
... and an abnormal degree of titanium-base stringers. Wall thickness was about 0.15 mm (0.006 in.) underside. It was concluded that the high vane pass frequency excited the natural vibration of the bellows to a higher resonance and cracked the bellows after a relatively short service period. The assembly...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001578
EISBN: 978-1-62708-233-4
... Speed Compressors Case #1: Balancing a Large Fan Case #2: Incorrect Selection of Isolators Case #3: High Axial Vibration on a Fan Due to a Disk Wobble Natural Frequency Case #4: High Cross Effect from Fan to Motor Case #5: Unequal Air Gap Case #6: Large 3600 rpm Motor in Venezuela...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001842
EISBN: 978-1-62708-241-9
...) the roll would be turning at 743 rpm. In addition to balancing, another critical parameter would be the natural frequency of the roll. A theory concerning the fracture of the roll was that the roll was in operation with sufficient imbalance and operating at sufficient proximity to a natural frequency...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001851
EISBN: 978-1-62708-241-9
... per minute (rpm) harmonic being predominant. The magnitude of the harmonics increases as the natural frequency of the system is approached. Perreira and Dubowsky [ 2 ] developed techniques for predicting noise levels of linked mechanical systems. Their work shows that the noise-generation process...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001576
EISBN: 978-1-62708-219-8
... of the vibration tester was adjusted to the natural frequency of the blade to effect resonance. Stress was monitored by strain gages. The blades in three different corners contour as shown in Fig. 2 were excited until cracks occurred. Figure 7 shows the S-N curve thus obtained. The blade with the corner shape...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0065826
EISBN: 978-1-62708-233-4
... at the tube opening. Calculation of the natural frequency of the wire showed that its third harmonic was almost exactly 60 Hz. Consequently, it was felt that this could be another source of stresses. To prevent future problems, either from corrosion fatigue or SCC, wires were made from annealed type 430...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001469
EISBN: 978-1-62708-229-7
... lateral vibration, i.e., “fluttering,” of the ring; as the jointing material eroded away progressively and cracks developed, the natural frequency of vibration would fall and so would the pitch of the note emitted, disintegration of the ring occurring when the cracks had extended sufficiently. Selected...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001366
EISBN: 978-1-62708-215-0
... natural frequency, the resonant frequency decreases, generally resulting in reduction of the vibratory amplitude. It is apparent that as the cracks propagated in the impeller, the reduction in the vibratory amplitude offsets the effect of the increase in crack lengths such that the stress-intensity range...
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
... equipment, change pump impellers), changing the natural frequency ( i.e. add supports, increase wall thickness), modifying system design ( i.e. reroute pipe, eliminate lollipops), and isolating the vibration energy ( i.e. install flexible hose). Material Response to Cyclic Stress Weld...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001412
EISBN: 978-1-62708-229-7
... of the vibrating system. A decrease in the rigidity of fixing results in a decrease of frequency, thus it seems likely that, in the case of those blades which were not a satisfactory fit in the wheel grooves, the natural frequency of vibration would be lowered to the point where it would coincide with the exciting...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006824
EISBN: 978-1-62708-329-4
... loading in gas and steam turbines, much higher in frequency than start/stop cycles, that can result in component damage over short periods of time. While the cyclic stresses involved are much lower than the yield stress, the repetitive nature of the stress leads to a damage mechanism known as high-cycle...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003526
EISBN: 978-1-62708-180-1
...-purpose program. Vibration and dynamic response is another area where general-purpose FEA software analysis provides useful information to design engineers and failure analysis investigations. Modal analyses to determine natural and harmonic frequencies of structures and components are often performed...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006773
EISBN: 978-1-62708-295-2
... the thermomechanical fatigue behavior of the most highly loaded components. Vibration and dynamic response is another area where general-purpose FEA software analysis provides useful information to design engineers and failure analysis investigations. Modal analyses to determine natural and harmonic frequencies...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003520
EISBN: 978-1-62708-180-1
... of performing these steps varies somewhat, depending on the nature of the investigation. Assemble background data, including (a) all information pertaining to the failure; (b) the history of the part, that is, processing and service; and (c) pertinent codes, specifications, and standards. Perform...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001024
EISBN: 978-1-62708-214-3
... in the main rotor blade of any helicopter can be generated from a variety of sources: the differences in relative air speed encountered during a revolution, the perturbations in air flow when the blade passes over the fuselage, the natural frequencies of the blade, and so forth. Because the main rotor blades...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003522
EISBN: 978-1-62708-180-1
... in fatigue, but the dark nature of the oxide on part of the fracture surface indicates that this cracking occurred a long time (years, in this case) before the later cracking. If the bolt had been cleaned in an attempt to display the underlying fracture surface of the metal, this somewhat dramatic evidence...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006757
EISBN: 978-1-62708-295-2
... for the failure analyst. This type of hardness tester uses a Vickers diamond attached to one end of a magnetostrictive metal rod. When the diamond-tipped rod is excited to its natural frequency by a piezoelectric converter and the free end with the diamond tip brought into contact with the surface of a solid body...