Particle simulation of AE statistics and fracture in concrete TPB test

摘要

We present some experimental results and numerical simulations of acoustic emissions (AE) due to damage propagation in a concrete specimen subjected to the three-point bending (TPB) test.The test is performed under Crack-mouth opening displacement control.Moreover,AE are detected by an eight sensors experimental device,which allows for signal localization and complete storing of the signal wave.The AE cumulative number,the time frequency analysis and the statistical properties of AE time series will be numerically simulated adopting the so-called 'particle method strategy'.The method provides the velocity of particles in a set simulating the behavior of a granular system and,therefore,is suitable to model the compressive wave propagation and AE (corresponding to cracking) in a solid body.The localization of AE events is correctly reproduced.In addition,the Gutenberg-Richter statistics of AE events due to cracking,crucial for the evaluation of damage and remaining lifetime,were simulated and result in agreement with the experimental evidences.