Fatigue Crack Characterization in Conducting Sheets by Non Contact Stimulation of Resonant Modes

Wincheski, Buzz; Fulton, J. P.; Todhunter, R. G.; Namkung, M.

doi:10.1007/978-1-4615-2848-7_275

Cited by 1 publication

(2 citation statements)

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“…5 displays the output voltage of the microphone at the frequency of the drive signal over a wide frequency range for an unflawed sample. The three peaks in the curve correspond to the second, third, and forth resonant modes of the sample, as verified in earlier work through finite element modeling [3].…”

Section: Q=5supporting

confidence: 79%

“…It has previously been shown that resonant modal analysis can provide a fast effective method for inspecting thin metal plates for fatigue cracks [1][2][3][4]. A non-contacting electromagnetic driver is used to stimulate resonant vibrations and the amplitude of the plate vibrations are monitored with acoustic emission or audio microphones as a function of the frequency of the applied force.…”

Section: Introductionmentioning

confidence: 99%

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Quality factor and microslipping of fatigue cracks in thin plates at resonant vibration

Wincheski

Namkung

Fulton³

1993

1993 Proceedings IEEE Ultrasonics Symposium

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Resonant vibrations have been stimulated in thin metal plates using a non-contacting electromagnetic driver. A sinusoidal force was applied in a swept frequency fashion and the resulting surface displacements were monitored through the use of an acoustic microphone. It has been found that the presence of a fatigue crack in the sample causes a broadening of the second resonance peak. The Q factors of the resonance curves were determined and are directly correlated with the presence of fatigue cracks in the samples. The broadening of the curves is explained in terms of a microslipping at the crack face walls which reduces the amplitude of the resonant vibration by increasing the damping of the system. A comparison is made between the resonance characteristics of fatigue damaged and notched samples, where the stiffness of the two systems is nearly constant while the interaction between crack face walls is eliminated in the latter.

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Section: Q=5supporting

confidence: 79%