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Report No.

Evaluation of globally- & locally-distributed erosion/cavitation damage by using laser ultrasonics

Wan, T.; Obayashi, Hironari; Sasa, Toshinobu

An ADS Target Test Facility (TEF-T) will be constructed within the framework of J-PARC project. A LBE spallation target will be installed in the TEF-T, and be bombarded by high power pulsed proton beams. During the operation, the erosion/cavitation damage imposed on the target vessel might be a key factor that determines its lifetime. Therefore, an in-situ structural integrity evaluation technique for the TEF-T target is expected to be established to inspect the damage. The vibration of LBE target vessel excited by pressure waves, which caused by the heat deposition in a short time due to the pulsed proton beam injection, will be monitored remotely to establish the technique. In this study, the basic research was carried out to investigate the relationship between structural vibration and damage. Samples with global- and locally-distributed erosion/cavitation damage were remotely evaluated by using laser generator and detector of ultrasonic waves. The influences of number and depth of damage on sample to structural vibration were studied through experiments and numerical simulations. A technique, Wavelet Differential Analysis (WDA), was developed to quantitatively and clearly "visualize" the differences caused by damage in the vibration signals. The results showed that the structural vibration is very dependent on damage, and the developed technique is applicable of quantitatively indicate this dependency.



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