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- W2793719749 abstract "The integrity of flange joints is critical in all pipe systems. To test this integrity, an ultrasonic method characterizing the condition of the flange joint would be a vital tool. In this study, we analyzed the contact conditions on a metal/gasket/metal connection. The instantaneous frequency profile, i.e., the phase change of the wave with time for longitudinal waves transmitted in an Al alloy/gasket/Al alloy system, was evaluated under various contact pressures. The instantaneous frequency (IF) was calculated with a complex continuous wavelet transform with a modified Morlet function as a mother wavelet. The maximum IF of the waves monotonically increased with contact pressure, showing similar properties as the amplitude of the waves. A one-dimensional numerical calculation with a finite difference time domain method with a spring condition for expressing various contact conditions or contact stiffness revealed that a large phase delay of the transmission wave was generated at a low contact stiffness interface, and the amount of delay was correlated with the contact stiffness. On the other hand, the delay in the reflected wave was very small." @default.
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- W2793719749 date "2018-01-01" @default.
- W2793719749 modified "2023-10-16" @default.
- W2793719749 title "Characterization of contact condition in a flange connection by longitudinal waves" @default.
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- W2793719749 doi "https://doi.org/10.1299/mej.17-00568" @default.
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