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Content available remote Numerical simulation of elastic wave propagation in masonry compared with acoustic emission experimental results
Livitsanos G., Shetty N., Verstrynge E., Wevers M., Van Hemelrijck D., Aggelis D. G.
Archives of Civil and Mechanical Engineering
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2020
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Vol. 20, no. 1
236--246
EN
It has been shown in acoustic emission literature that the distance between a possible cracking event and a receiver is affecting the signal parameters providing a wrong image of the real fracture characteristics. In this study, lab-scale experimental tests on masonry components are performed in order to determine the disturbance of the acoustic emission wave properties and verify the experimental observations via numerical wave propagation analysis. The investigation is extended to different geometries including “couplets,” “triplets” and masonry walls. The simulations allow to understand, verify and predict the acoustic emission signal properties alterations in many different types of masonry experiments as well as the correct characterization of the fracture mode.
2
Content available remote Study on mechanical acoustic emission sources in fresh concrete
Dzaye E. D., de Schutter G., Aggelis D. G.
Archives of Civil and Mechanical Engineering
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2018
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Vol. 18, no. 3
742--754
EN
Acoustic emission testing has proven very useful as a non-invasive monitoring method for several material processes. Recently several studies have emerged related to fresh concrete monitoring, as AE has the sensitivity to record waves from many different processes, even though no external load is applied to the specimens. Due to the complexity of the activity including among others formation of hydrates, settlement, water migration, early age cracking, the accumulated AE cannot be easily explained. In the present paper, two mechanisms of mechanical origin (aggregate and bubble movement through the paste) are isolated and the characteristics of their emissions are studied. Experimental results are complemented with numerical simulations to enhance the understanding due to the complexity of the wave propagation problem.
3
Content available remote Acoustic emission monitoring of granite under bending and shear loading
Mpalaskas A. C., Matikas T. E., Van Hemelrijck D., Papakitsos G. S., Aggelis D. G.
Archives of Civil and Mechanical Engineering
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2016
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Vol. 16, no. 3
313--324
EN
In this study bending and shear fracture experiments on healthy and adhesively repaired granite samples with concurrent acoustic emission (AE) monitoring are discussed. AE can characterize the difference between the fracture modes using simple features analysis based on the activity of the early loading. It is the first time that such a direct correspondence between the stress field and the results of a monitoring technique emerge for granite. This offers new insight in the material's behavior especially in relation to complicated geometries where the dominant stress mode is not known a priori.
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