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- W1992058997 abstract "Abstract The acoustic emission (AE) method was applied to monitor the initiation of macroscopic and microscopic cracks in three artificial graphite electrodes under three-point bending by using notched specimens. AE signals detected by piezoelectric transducer were classified into eight levels of amplitude. The load-displacement curves on three samples show non-linear behaviour. Low-level AE signals are detected from the early stage of loading. On the other hand, high-level AE signals above 2·0V are detected around the maximum load. The sample with high Young's modulus gives late initiation of AE signals, but a large number of the signals at each AE level. The J-values determined from the abrupt increase in cumulative AE energy, J iAE , are considered to correspond to the critical value J IC for the initiation of macroscopic crack; 0·0135, 0·0155 and 0·0165kg/mm being determined on three samples. The load corresponding to the J iAE -value is in the range of 85 to 90% of the maximum load. The crack-opening displacement corresponding to J iAE -value shows a similar value and does not coincide in position with maximum load on each sample. The AE signal generating model on porous artificial graphite electrode is also discussed." @default.
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- W1992058997 date "1991-01-01" @default.
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- W1992058997 title "Acoustic emission characteristics and fracture toughness of artificial graphite electrodes" @default.
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- W1992058997 doi "https://doi.org/10.1016/0955-2219(91)90053-3" @default.
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