Acoustic Emission from Quasi-Brittle Failure of Cementitious Composites - Experimental Measurements and Cohesive Crack Model Simulations

Veselý, Václav; Vodák, Ondřej; Trčka, Tomáš; Sobek, Jakub; Koktavý, Pavel; Keršner, Zbyněk; Koktavy, B.

doi:10.4028/www.scientific.net/kem.592-593.676

Cited by 2 publications

(2 citation statements)

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“…The so-called lattice-model allows for a detailed discretization of the microstructure, and acoustic emission events can be related to the rupture of lattice elements or bundle of elements [20]. Alternatively, continuous discretization can be coupled with discontinuities described with the cohesive crack model [21], and crack advancements can be directly related to the occurrence of acoustic emissions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Models for the Assessment of Historical Masonry Structures and Materials, Monitored by Acoustic Emission

2016

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Abstract:The paper reviews some recent numerical applications for the interpretation and exploitation of acoustic emission (AE) monitoring results obtained from historical masonry structures and materials. Among possible numerical techniques, the finite element method and the distinct method are considered. The analyzed numerical models cover the entire scale range, from microstructure and meso-structure, up to full-size real structures. The micro-modeling includes heterogeneous concrete-like materials, but mainly focuses on the masonry texture meso-structure, where each brick and mortar joint is modeled singularly. The full-size models consider the different typology of historical structures such as masonry towers, cathedrals and chapels. The main difficulties and advantages of the different numerical approaches, depending on the problem typology and scale, are critically analyzed. The main insight we can achieve from micro and meso numerical modeling concerns the scaling of AE as a function of volume and time, since it is also able to simulate the b-value temporal evolution as the damage spread into the structure. The finite element modeling of the whole structure provides useful hints for the optimal placement of the AE sensors, while the combination of AE monitoring results is crucial for a reliable assessment of structural safety.

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Section: Introductionmentioning

confidence: 99%

Numerical Models for the Assessment of Historical Masonry Structures and Materials, Monitored by Acoustic Emission

2016

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“…1a) and subjected to tests in 3 different configurations. During these tests, apart from the typical outputs such as the load-displacement curves, signals from failure events causing acoustic emission, were recorded (in detail, see Vodák [3] and Veselý et al [4]). The AE events records were then processed in order to estimate the extent of the material failure zone in the specimens [5].…”

Section: Introductionmentioning

confidence: 99%

Fracture Events Localization by Numerical Simulations of Cementitious Composites

Sobek

Štafa

Veselý

2015

KEM

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This paper presents a numerical study of failure behavior of cementitious composite materials differing in their composition (aggregate size). A set of four different materials was tested in atypical 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. However, reliability of the procedures of the failure events localization might seem questionable in some cases – therefore, the test evaluation procedures were accompanied by analyses using 3D numerical simulation tools based on nonlinear fracture-mechanics approach and propagation of fracture events 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 one is an own developed discrete lattice-type model. The comparison of AE records from the tests with the results of the performed numerical simulations can answer questions on the distribution and magnitude (and possibly the energy dissipation amount) of the recorded failure events and generally help in the interpretation and exploitation of AE in the research of failure of non-electric building materials.

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Acoustic Emission from Quasi-Brittle Failure of Cementitious Composites - Experimental Measurements and Cohesive Crack Model Simulations

Cited by 2 publications

References 6 publications

Numerical Models for the Assessment of Historical Masonry Structures and Materials, Monitored by Acoustic Emission

Numerical Models for the Assessment of Historical Masonry Structures and Materials, Monitored by Acoustic Emission

Fracture Events Localization by Numerical Simulations of Cementitious Composites

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