The transparency of fatigue cracks to NDT methods used for the inspection of offshore structures
This paper presents results from a study of crack transparency to NDT techniques, which has been completed for sponsors of the Harwell Offshore Inspection R and D Service. Different mechanisms which could lead to transparency to the different inspection methods are described, including crack tightness, crack morphology, and the bridging of cracks by corrosion or calcareous deposits. Results are presented from experimental measurements with several NDT methods for a range of cracks grown under different conditions. Most techniques available or under development for underwater detection and sizing of cracks are included - magnetic particle inspection, AC potential drop, pulse-echo and time-of-flight diffraction ultrasonics, and eddy current methods, together with some acoustic emission measurements.
- OSTI ID:
- 5968865
- Report Number(s):
- CONF-870993-
- Country of Publication:
- United States
- Language:
- English
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ACOUSTIC EMISSION TESTING
ACOUSTIC TESTING
CONTROL SYSTEMS
CORROSION FATIGUE
CRACKS
CURRENTS
DIFFRACTION METHODS
EDDY CURRENTS
ELECTRIC CURRENTS
ELECTRICAL SURVEYS
ELECTROMAGNETIC SURVEYS
FATIGUE
GEOPHYSICAL SURVEYS
JOINTS
MATERIALS TESTING
MECHANICAL PROPERTIES
NONDESTRUCTIVE TESTING
OFFSHORE PLATFORMS
ON-LINE CONTROL SYSTEMS
ON-LINE SYSTEMS
STRESS ANALYSIS
SURVEYS
TECHNOLOGY ASSESSMENT
TESTING
TIME-OF-FLIGHT METHOD
UNDERWATER OPERATIONS
VALIDATION
WELDED JOINTS