Numéro
J. Phys. IV France
Volume 02, Numéro C1, Avril 1992
Deuxième Congrès Français d'Acoustique / Second French Conference on Acoustics
Page(s) C1-495 - C1-498
DOI http://dx.doi.org/10.1051/jp4:19921106
Deuxième Congrès Français d'Acoustique / Second French Conference on Acoustics

J. Phys. IV France 02 (1992) C1-495-C1-498

DOI: 10.1051/jp4:19921106

MÉCANISMES D'ENDOMMAGEMENT ET DE RUPTURE EN TRACTION DE MATÉRIAUX CHAUSSÉES PAR ÉMISSION ACOUSTIQUE

R. LINDER1, M.C. REYMOND2 and J. VECOVEN3

1  LCPC, Service de Mécanique, UMR 113, La courtine, F-93167 Noisy le Grand, France
2  CNRS - UMR 113, LCPC, 58 Bd Lefebvre, F-75732 Paris cedex 15, France
3  Laboratoire Régional des Ponts et Chaussées, Zone Industrielle, BP. 141, F-41405 Autun, France


Abstract
The study deals with the damage of road materials treated with hydraulic binder. The experimental method consists in applying to each test cylinder a small number load-unloading cycles in tension with increasing amplitude. The evolution of the behavior is analyzed using the events of acoustic emission sent by the damaged aera. The main mechanism appears as decohesion between the coarse grains and the matrix. There relatively low number and their random spatial distribution, known thanks to the longitudinal location of emission sources, allows to modelise the damaged material to a spherical heterogeneous material made-up with an envelope representing the sound material and an empty core representing the detached grain. The macroscopic failure starts from a coalescence on one of the resulting gaps.



© EDP Sciences 1992