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Acoustic emission measurements on an intermediate size vessel

: Knoch, P.; Deuster, G.; Maier, H.J.; Waschkies, E.


Nuclear Engineering and Design 129 (1991), S.217-228
ISSN: 0029-5493
MPA-Seminar <7, 1981, Stuttgart>
Fraunhofer IZFP ()
acoustic emission; crack growth; cycle fatigue test; Druckbehälter; Ermüdungsbelastung; Fehlerdetektion; hydrotest; pressure vessel; Rißwachstum; Schallemission; Wasserdruckprobe

To demonstrate and to extend the performance of acoustic emission testing as a method of detecting and classifying flaws, six instituts conducted acoustic emission measurements in the course of varous loading tests on a medium-sized, thickwalled vessel (model of a reactor pressure vessel) containing natural flaws. This paper will present a description of the vessel and the preparation of the foaw patch with 14 natural flaws, the performance of the loading tests to simulate pressure test and operating conditions existing in the primary systems of pressurized water reactors, and especially the conduction of acoustic emission measurements by using various monitoring systems.In the pressure tests conducted with slowly rising pressures, only one flaw was detected unequivocally by the acoustic emission monitoring, although several flaws had grown in the test phases between the pressure test. Cyclic loading over prolonged periods of time produced clear signals of larger flaws, which calculati ons and subsequent destructive investigations showed to have grown. The small foaws which, most probably, had not changed, dould not be detected.