HIGHLIGHTS
SUMMARY
In this regard, to ensure the high quality and required reliability of the structures of critical fiberglass products, it becomes necessary to determine the depth of the folds by non-destructive testing methods. The high value of the correlation coefficient indicates the possibility of determining the depth of the folds by changing the propagation time of ultrasonic waves on the folds. Using the least squares method, a regression line was determined, described by the equation: h=0,49×Δt + 0,34, which makes it possible to determine the depth of the folds based on . . .
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