Fracture process zone size and true fracture energy of concrete using acoustic emission

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Influence of damage in the acoustic emission parameters (2013, background): “Therefore, the number of recorded hits and key waveform features like amplitude, energy and frequency carry information from the damage mode and the fracture process [4–7].”
Fracture examination in concrete through combined digital image correlation and acoustic emission techniques (2014, background): “Extensive studies have shown that the absolute acoustic energy is the most important parameter to characterize an event [26,27].”
Determination of Tensile Strength and Fracture Toughness of Granite Using Notched Three-Point-Bend Samples (2016, unknown): “The fine measurements can capture quasibrittle fracture activities prior to the peak loads, as confirmed by acoustic emission (Hashida and Takahashi 1993; Muralidhara et al. 2010; Ohno et al. 2014).”
Cracking and crackling in concrete-like materials: A dynamic energy balance (2016, background): “From the viewpoint of energy dissipation and emission, the cumulative number of AE events and the energy content of the AE events are usually correlated to the mechanical energy dissipated during the complete failure process, namely fracture energy in tension and crushing energy in compression [18,1”