Defect characterization by ultrasonic diffraction techniques

Jorma Pitkänen

Research output: Book/ReportReport

Abstract

Different ultrasonic diffraction techniques are described. Two diffraction techniques have been chosen for the experiments. Three steel blocks with notches of different sizes and orientations were tested with satellite-pulse-observation (SPOT) and peak-echo techniques (PE). The shear-wave mode was used in the experiments. The best results in sizing defects were achieved by using the peakecho technique with a 45° angle probe. The average error was -0.5 mm and the standard deviation ±1.3 mm. The corresponding values using the same technique and a 60° angle probe were 2.8 mm and ±2.1 mm. The average error was -0.5 mm and standard deviation ±2.3 mm by transit time differences in SPOT. The evaluation from the frequency content in sizing defects by SPOT gave an average error of -0.3 mm and a standard deviation of ±2.3 mm.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages40
ISBN (Print)951-38-2721-6
Publication statusPublished - 1986
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
Number444
ISSN0358-5077

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Keywords

  • ultrasonic tests
  • nondestructive tests

Cite this

Pitkänen, J. (1986). Defect characterization by ultrasonic diffraction techniques. VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 444