Abstract
The b-value analysis is closely connected mainly with research in the field of geosciences such as earthquakes and rock failure processes. However, the given approach can also be applied in conjunction with the acoustic emission method, which processes signals arising on a similar physical principle as in the case of geological events mentioned above. The b-value analysis, including its modification in the form of an improved b-value, was mainly used during its existence to characterize the state of structural damage in several industrial applications. A certain advantage and disadvantage at the same time in the case of the improved b-value approach is the possibility to specify the interval range on which the calculation of the Ib-value is performed. The aim of this publication is to introduce a methodology for autonomous determination of the interval range within the Ib-value calculation process, since the given functionality may cause certain errors for an inexperienced user. The proposed methodology is subsequently verified on a tensile test of a multilayer carbon fibre reinforced plastic composite material, which is supplemented by monitoring the deformation of individual laminae using the digital image correlation technique and compared with the conventional evaluation of the (I)b-value method. The results obtained point to a conclusion that the proposed methodology makes it possible to react more sensitively to possibly occurring violations in structural integrity and, at the same time, more accurately characterise the cumulative amplitude distribution itself.
Published Version
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