Abstract
The acoustic emission source wave analysis was carried out to examine the dynamic information about the magnitude of energy release and time-scale of fracture events. The response function of specimens and transducer was obtained experimentally by the standard step response due to breaking pencil lead, and using this response function, the source waves were determined in terms of energy release-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 pop-in deduced was about 0.9-2.8 μs, which indicates the mean velocity of pop-in crack growth to be about 80-900 m·s−1 and the maximum velocity approximately 1500 m·s−1. The energy release obtained by this method corresponded well to that calculated from the linear fracture mechanics.
