Abstract
The kinetics offracture of cupped brass samples in a HgNO3 solution (according to ISO-R196 standard) is investigated by means of acoustic emission(AE). Measured parameters are the root-mean-square, VRMS, of the AE signal and the pulse count rate, No, above a fixed threshold. Both low and high levelAE signals are detected during fracture nUfleation and progress. Some characteristic patterns of acoustic activity can be recognised and correlated to specific stages of the fracture process. The observed differences in acoustic activity between different samples is attributed to corresponding differences in the homogeneity of residual stress distribution on a microstructural scale. The potential of AE measurements in the study of environment-assisted fracture is pointed out, especially if combined with other independent techniques.
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