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An overview of the ultrasonic (US) methods used for the detection of creep damage in the form of cavities on grain boundaries or intergranular microcracks is given. After an introduction to the problem of creep damage, US-techniques such as US-velocity measurements, attenuation measurements and backscattered noise analysis are discussed. It is shown that the greatest potential for further development and application to components exists in the case of velocity measurements. The comparison of experimentally determined velocity changes in different steels with theoretical models shows that a careful analysis of the data is necessary in order to assess reliably the actual state of creep damage. Comparisons with results of other, destructive, damage determination methods demonstrate that under laboratory conditions the resolution potential of US-velocity measurements is comparable to those achieved with other methods.

Additional information

Authors: STAMM H, JRC Ispra (IT)
Bibliographic Reference: Article: The European Journal of Research in Non-Destructive Testing, Vol. 1 (1992) No. 4, pp. 169-178
Record Number: 199211045 / Last updated on: 1994-12-02
Original language: en
Available languages: en