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natural frequency

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Published: 01 December 2019
Fig. 12 Shape assumed by stent when resonance occurs at a natural frequency of 139.6, 139.7, 140.0, and 140.5 kHz. At each frequency the maximum amplitude occurs at the end crowns (where failure was observed during crimping) More
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Published: 01 December 2019
Fig. 13 Close up of stent shape when resonance occurs at a natural frequency of 140.0 kHz More
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Published: 01 December 2019
Fig. 8 Natural frequencies of studied spinning system More
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 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 to cause...
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
... 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 configuration. A number...
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
.... 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 Fatigue fracture...
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
... together. It was determined that the induction furnace was exciting the natural frequencies of the plate, creating standing waves that resulted in the stripes being formed as the molten zinc flowed to the wave nodes. The thin plate had several natural frequencies within the normal operating range...
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
.... Recall that once placed in operation with a felt speed of 3100 ft/min (946 m/min) 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...
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
... on the shaft running speed, with two times the revolutions 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...
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
... on the blade. One pair of a blade and a ring was removed from the rotor and fixed firmly on a electro-magnetic vibration tester. As shown in Fig. 7 , it was mounted in a cantilever style. Fig. 7 S-N curve of blade corner The exciting frequency of the vibration tester was adjusted to the natural...
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
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001052
EISBN: 978-1-62708-214-3
... 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 was redesigned...
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
...., “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 Reference 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
... as the result of a component vibrating at its 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...
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 Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001594
EISBN: 978-1-62708-229-7
.... Only small amounts of vibrational energy are needed to induce cyclic bending forces of sufficient magnitude to exceed the pipe's ability to support the object, particularly if the frequency of vibration matches the natural frequency of the cantilever. The locations of the two opposing major cracks...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006930
EISBN: 978-1-62708-395-9
... time scale, and the viscous nature predominates. The crossover point can often be correlated with the molecular weight and molecular weight distribution of the polymer ( Ref 6 ). The molecular weight is related in an inverse way to the crossover frequency, and the crossover modulus is related also...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006940
EISBN: 978-1-62708-395-9
... of polymers, it can be even more time-consuming because the cyclic loadings should be run under slower frequencies as compared, for example, to metals. In addition, several repeats at each stress level may be required to account for the statistical nature of the data obtained. A factor of 3 orders...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006913
EISBN: 978-1-62708-395-9
... where an electrical field is present, the dielectric breakdown property is an important factor. The dielectric strength of a material is, in many situations, the deciding factor in the nature of the system in which it is to be used. Results obtained using this test provide part of the information...
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
... 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 fatigue (HCF). Early...