期刊
INSIGHT
卷 54, 期 4, 页码 208-216出版社
BRITISH INST NON-DESTRUCTIVE TESTING
DOI: 10.1784/insi.2012.54.4.208
关键词
ultrasonic testing; rotating shafts; fatigue cracks; artificial notches; probability of detection
The structural integrity of safety components during service is strictly related to different factors, such as the performance of the adopted non-destructive method, the crack growth behaviour of the material and the load history during service. The present research is focused on ultrasonic non-destructive testing effectiveness which, during both the manufacturing stage and in-service inspections, is essentially based on the adoption of suitable sample blocks for sensitivity calibration and the reliable knowledge of the probability of detection curve of the adopted non-destructive testing method. Firstly, a comparison between the ultrasonic responses coming from artificial flaws and natural fatigue cracks is carried out, proposing a novel approach for their interpretation and coming to some interesting conclusions regarding the effective design of sample blocks for sensitivity calibration. Eventually, in order to improve their flexibility and the possible extrapolation to similar cases, probability of detection curves were also derived based on the proposed approach, showing interesting advantages with respect to the traditional one.
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