抄録
The acoustic emission source characterization was carried out to examine the dynamic information about the microfracture processes. The response function of specimens and transducer was obtained experimentally by use of breaking pencil lead as a reference simulated AE source, and the source waves were determined in terms of crack volume-time functions explicitly through a time-domain deconvolution. This method was tested by measuring the acoustic waveforms from pop-in crack growth in 7075-T6 aluminum alloy. The lifetime of each pop-in deduced was about 0.9–2.8 μs, and the crack volumes obtained by this method were consistent with fractographic observations. From these results, the maximum crack velocity was shown to reach about 1000 m/s.
