Spatio-Temporal Distribution of the Sources of Acoustic Events in Notched Fiber-Reinforced Concrete Beams under Three-Point Bending.

During both these periods (i.e., the period of rapid increase in the acoustic activity and the period of its rapid decrease), namely, for the interval t f − τ < 8 s, the average distance between the acoustic sources exhibits an increasing trend from the global minimum value of 3.3 cm toward a maximum value approaching (for the last group of events) the value of 7.7 cm, which was attained during the very early loading steps (first group of events).

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Finally, during the third interval (0.4 s < (t f − τ) < 1 s), both the frequency of generation of acoustic events and the load applied exhibit a decreasing trend until the specimens are macroscopically fractured.

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