%0 Journal Article %T Passive monitoring of nonlinear relaxation of cracked polymer concrete samples using Acoustic Emission %+ Laboratoire d'Acoustique de l'Université du Mans (LAUM) %+ Centre de Transfert de Technologie du Mans (CTTM) %A Yu, Xiaoyang %A Bentahar, Mourad %A Mechri, Charfeddine %A Montrésor, Silvio %< avec comité de lecture %@ 0001-4966 %J Journal of the Acoustical Society of America %I Acoustical Society of America %8 2019-10-03 %D 2019 %R 10.1121/1.5127519 %K Elastic modulus %K Elastic energy %K Superposition principle %K Viscoelastic properties %K Signal processing %K Acoustic phenomena %K Acoustic signatures %K Linear filters %K Granular materials %K Polymers %Z Engineering Sciences [physics]/Acoustics [physics.class-ph]Journal articles %X This work presents an acoustic emission (AE) monitoring ofslow dynamics in micro-cracked polymer concrete (PC) samples. Inorder to obtain calibrated damage states, AE was first used to characterize the micro-damage mechanisms in real time when PC samples aresubmitted to three-point bending tests. Then, an unsupervised classification of AE data based on the Principle Component Analysis and thek-means clustering was applied to classify AE data. The AE monitoringof the nonlinear relaxation of PC samples revealed the existence of asilence period followed by AE hits belonging to two different damageclasses. A similarity appeared between the properties of the detected AEhits obtained during the nonlinear relaxation and the quasi-static tests.Finally, this work shows that the dynamics of both mechanisms duringthe nonlinear relaxation are clearly different. %G English %2 https://hal-univ-lemans.archives-ouvertes.fr/hal-02462731/document %2 https://hal-univ-lemans.archives-ouvertes.fr/hal-02462731/file/1.5127519-1.pdf %L hal-02462731 %U https://hal-univ-lemans.archives-ouvertes.fr/hal-02462731 %~ CNRS %~ UNIV-LEMANS %~ LAUM