Experimental results are presented for fracture tests carried out on concrete and rock specimens under compression, and an analysis is performed for low-frequency acoustic emissions (elastic emissions, or ELE) due to crack growth. ELEs are vibrations of the specimen surface with relevant amplitudes and low frequencies (between 1 kHz and 20 kHz), appearing at the very last stages of the test and then revealing imminent failure. A spectral analysis of the ELEs is performed by measuring with a calibrated transducer the local acceleration of the specimen surface in the application point of the transducer. Quantitative estimation of ELE released energy is given in terms of kinetic energy using a simple kinematic model.
Analysis of energy released by elastic emission in brittle materials under compression / Schiavi, Alessandro; G., Niccolini; P., Tarizzo; G., Lacidogna; A., Manuello; A., Carpinteri. - (2010). (Intervento presentato al convegno Proceedings of the SEM Annual Conference June 7-10, 2010 Indianapolis, Indiana USA tenutosi a Indianapolis, Indiana USA nel June 7-10, 2010).
Analysis of energy released by elastic emission in brittle materials under compression
SCHIAVI, ALESSANDRO;
2010
Abstract
Experimental results are presented for fracture tests carried out on concrete and rock specimens under compression, and an analysis is performed for low-frequency acoustic emissions (elastic emissions, or ELE) due to crack growth. ELEs are vibrations of the specimen surface with relevant amplitudes and low frequencies (between 1 kHz and 20 kHz), appearing at the very last stages of the test and then revealing imminent failure. A spectral analysis of the ELEs is performed by measuring with a calibrated transducer the local acceleration of the specimen surface in the application point of the transducer. Quantitative estimation of ELE released energy is given in terms of kinetic energy using a simple kinematic model.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
