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Testing of NDT procedures on realistic structures containing realistic flaws is an important method of qualification. The flaws may not necessarily be real ones, but must be ones which induce the real physical phenomena that the inspection technique is intended to handle effectively. Limiting cases that could be imagined during actual plant inspections should also be considered. PISC category A flaws (artificial sharp, planar and smooth) are very useful in this respect. They can be introduced in a reproducible way in blocks and structures. In this paper, the crack tip diffraction from real fatigue cracks is compared in detail with that from realistic PISC category A flaws in ferritic steel. The possibility of detecting crack tip diffraction in stainless steels is also discussed.

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Authors: LEMAITRE P, JRC Ispra (IT);LAKESTANI F, JRC Ispra (IT);CRUTZEN S, JRC Ispra (IT);DOMBRET P, AIB-Vinçotte, Bruxelles (BE);MAES G, AIB-Vinçotte, Bruxelles (BE)
Bibliographic Reference: Paper presented: 12th International Conference on NDE in the Nuclear and Pressure Vessel Industries, Philadelphia (US), October 11-13, 1993
Availability: Available from (1) as Paper EN 38464 ORA
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