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- W2024707413 abstract "A model for studying the effects of defect surface roughness on ultrasonic signals is described. The model contains many aspects of a real inspection system, giving predictions of interest to practical ultrasonic non-destructive testing. Acoustic Kirchhoff theory is used in a full time-dependent calculation, to give A, B or C scan information for arbitrary inspection geometries. This paper presents comparisons of the model predictions and experimental results. Comparison with time-harmonic pulse-echo measurements from a corrugated surface shows agreement to within 2 dB for average scan amplitudes. Comparison is also made with time-dependent pulse-echo measurement of the variation of average signal amplitude with angle of incidence, for surfaces ranging from smooth to very rough. Agreement between the experimental results and the model predictions is typically to within 3 dB, except for very rough surfaces. Model predictions are then presented for 45° tandem inspection and 60° pulse-echo inspection of defects of various orientations. The model shows how roughness decreases the detectability of well-oriented defects but enhances the detectability of defects which are mis-oriented by more than ≈ 20°. The effects of roughness on sizing techniques are also briefly discussed. It is shown that amplitude measurements for the dB drop technique may require careful interpretation when surface roughness is present. Time-based sizing techniques may also be affected, since roughness can lead to the loss of distinct diffracted signals from which to make timing measurements." @default.
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- W2024707413 date "1989-03-01" @default.
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- W2024707413 title "Model for the ultrasonic inspection of rough defects" @default.
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- W2024707413 doi "https://doi.org/10.1016/0041-624x(89)90016-4" @default.
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