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Vibro-enhanced fluorescent penetrant inspection (FPI)

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The potential of vibration as a means of encouraging liquid penetrant to fill and bleed out of cracks, by changing the crack mouth opening or the surface energy of the liquid-solid interface, was investigated. An image-processing algorithm was used to automatically detect crack indications. Tests were carried out with both static and dynamic loading; the change in crack mouth opening with static load was measured optically. The probability of detection of the penetrant process was observed to increase if the crack was loaded either statically or dynamically. The cross-crack strain required to observe an improvement was the same for static and dynamic loading (>500 ). Therefore, there is no advantage in loading the crack with this mode of vibration. Also, the dynamic strains approached the fatigue threshold for crack propagation and so would be unacceptable from a structural integrity point of view.
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Keywords: POD; Penetrant; small defects

Document Type: Research Article

Affiliations: 1 Leads the UK Research Centre in NDE at the Department of Mechanical Engineering, Imperial College London, SW7 2AZ, UK.

Publication date: July 1, 2009

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