Numerical simulations towards verification of acoustic emission events localization in splitting tests of cementitious composites

Numerical simulations towards verification of acoustic emission events localization in splitting tests of cementitious composites

Paper in proceedings (conference paper)

The paper presents a numerical study of failure behavior of cement-based composite materials differing in their composition, particularly the aggregate size. A set of four different materials was tested in two variants of splitting test geometry. During these tests, apart from the typical outputs such as the load–displacement curves, signals from failure events causing acoustic emission (AE) were recorded. Subsequently, the event’s localization analysis was performed. However, reliability of the procedures of the failure events localization might seem questionable in some cases. There-fore, the test evaluation procedures were accompanied by analyses using numerical simulation tools based on non-linear fracture-mechanics approach. 3D numerical simulations of the stress distribution evolution and the crack (more precisely the fracture process zone) propagation in the specimens are performed using two computational codes. One is a commercial non-linear FEM code with implementation of cohesive crack model (in the smeared cracks formulation). The second is an own developed discrete lattice-type model. Both approaches are compared with experimental AE data.

The paper presents a numerical study of failure behavior of cement-based composite materials differing in their composition, particularly the aggregate size. A set of four different materials was tested in two variants of splitting test geometry. During these tests, apart from the typical outputs such as the load–displacement curves, signals from failure events causing acoustic emission (AE) were recorded. Subsequently, the event’s localization analysis was performed. However, reliability of the procedures of the failure events localization might seem questionable in some cases. There-fore, the test evaluation procedures were accompanied by analyses using numerical simulation tools based on non-linear fracture-mechanics approach. 3D numerical simulations of the stress distribution evolution and the crack (more precisely the fracture process zone) propagation in the specimens are performed using two computational codes. One is a commercial non-linear FEM code with implementation of cohesive crack model (in the smeared cracks formulation). The second is an own developed discrete lattice-type model. Both approaches are compared with experimental AE data.

Quasi-brittle fracture, splitting test, numerical simulation, cohesive crack model, smeared crack approach, lattice model, acoustic emission, fracture events localization

Quasi-brittle fracture, splitting test, numerical simulation, cohesive crack model, smeared crack approach, lattice model, acoustic emission, fracture events localization

SOBEK, J.; ŠTAFA, M.; VESELÝ, V.

2016

27.04.2015

J. Toribio, B. Gonzáles, J-C. Matos

Zamora, Spain

32th Spanish Conference on Fracture and Structural Integrity – Encuentro del Grupo Español de Fractura 32 GEF (Anales de Mécanica de la Fractura)

0213-3725

Anales de Mecánica de la Fractura

2015

32

Kingdom of Spain

160

165

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