PSI - Issue 32

O.V. Bocharova et al. / Procedia Structural Integrity 32 (2021) 299–305 Bocharova O.V., Andzjikovich I.E., Sedov A.V., Kalinchuk V.V. / Structural Integrity Procedia 00 (2021) 000 – 000

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4

a

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acceleration (mV)

-2

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time (ms)

slot

1 steel plate

2 steel plates

without defects

b

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-0.5 acceleration (mV)

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0.5

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time (ms)

slot

1 steel plate

2 steel plates

without defects

Fig. 3. Surface wave field for samples with various types of defects. (a) accelerometer 1; (b) accelerometer 2.

Two accelerometers have been used in experiments. Accelerometer 1 was located at the distance of 237 mm from the left end of the beam and detected the reflected wave; accelerometer 2 was located at the distance of 720 mm from the left end of the beam and detected transmitted wave. The possibility of detecting and the efficiency of recognizing the presence of a defect, its type and size by the reflected and transmitted wave fields has been investigated. Fig. 3 (a) and (b) show accelerograms of the wave field measured on the surface of the samples by accelerometers 1 and 2, respectively. To increase the informativeness of the proposed method, an original approach has been developed previously in Bocharova et al. (2016), Bocharova et al. (2017), Sedov et al. (2017), which makes it possible to catch insignificant differences in wave fields and, thereby, identify the presence of inhomogeneities in the object under study. This