Strain · 2010 · 65 citations · 17 references
Natural SciencesMaterials EngineeringMaterials ScienceAcousticsMechanical Behavior Of MaterialsStructural MaterialsAcoustic MeasurementDamage MechanicsDuctilityFracture MechanicsStructural AcousticsAcoustic EmissionAcoustic Emission AnalysisAcoustic Emission MeasurementBrittle DamageCompressionElastic WavesGutenberg-richter RelationWave Propagation Analysis
Abstract: The damage process in a concrete specimen subjected to uniaxial compression test is investigated by detection of the propagating elastic waves because of micro‐ and macrocrack growth. Besides the high‐frequency acoustic emissions (AEs), the presence of low‐frequency elastic emissions (ELEs), from 1 to 10 kHz, is detected just before the specimen failure. A spectral analysis of the ELEs is performed by measuring with a calibrated transducer the local acceleration of the specimen surface. Quantitative information about the macrocrack effects in terms of released energy is thus obtained. Furthermore, the evolution of damage is followed through the analysis of the amplitude distribution of AE and ELE signals, distributed according to the Gutenberg–Richter (GR) statistics.
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