DREA - ROYAL NETHERLANDS NAVY COOPERATIVE PROGRAM ON INSPECTION OF THIN-WALLED PLATE

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Authors
  1. Hay, R.D.
  2. Hay, T.D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);TEKTREND International Inc, Montreal QUE (CAN)
Abstract
Twenty-one steel plates into which artificial defects had been introduced were provided by the Royal Netherlands Navy to evaluate the potential of ultrasonics for inspection thin plate used in surface ships compared to radiography and to provide preliminary classifications of the defects using pattern recognition methods. The Canadian Forces APHIUS ultrasonic system was used for all these tasks. At the present state of the art, the detectability of both methods is approximately the same with some advantage to ultrasonics. With respect to flaw identification both methods have certain strengths, but the overall advantage belongs to ultrasonics due to the improved ability to identify lack of fusion. Good pattern classification performance was achieved on the 12 and 15 mm plates. Since no time domain features were used the results are relatively independent of the testing setup. The ultrasonic method offers potential for improvement of detectability through procedure optimization and interpretability through development of graphical and artificial intelligence tools.
Report Number
DREA-CR-95-427 — Contractor Report
Date of publication
01 May 1995
Number of Pages
44
DSTKIM No
95-04138
CANDIS No
153241
Format(s):
Document Image stored on Optical Disk;Hardcopy

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