Abstract
Acoustic emission (AE) is applied for the structural health evaluation of materials. It commonly uses piezoelectric sensors to detect elastic waves coming from energy releases within the material. Concerning cementitious composites as well as polymers, AE parameters have proven their potential to not only detect the existence of a defect, its location and the fracture mode, but also the developing strain field even before visible damage evolves. However, the wave propagation distance, wave dispersion due to plate geometry, heterogeneity and reflections result in attenuation and distortion of the AE waveforms. These factors render the interpretation more complex, especially for large samples. In this study, the effect of wave propagation on plain glass textile-reinforced cement (TRC) plates is investigated. Then, curved plates with different widths are mechanically loaded for bending with concurrent AE monitoring. The aim is to evaluate to what extent the plate dimensions and propagation distance influence the original AE characteristics corresponding to a certain fracture mechanism.
Highlights
Acoustic emission (AE) has successfully been used to monitor the failure process of composite media for a long time
It utilizes piezoelectric sensors to monitor the elastic waves emitted by irreversible processes like cracking and the general failure process in materials
It has been recently demonstrated that acoustic emission is sensitive to the applied stress field long before damage is inflicted to the polymer and cementitious composites [6–8]
Summary
1. Introduction Acoustic emission (AE) has successfully been used to monitor the failure process of composite media for a long time. It utilizes piezoelectric sensors to monitor the elastic waves emitted by irreversible processes like cracking and the general failure process in materials. The detection of active cracking and information on the fracture mode, something very essential for composites, as well as source localization have been extensively utilized [1–5]. It has been recently demonstrated that acoustic emission is sensitive to the applied stress field long before damage is inflicted to the polymer and cementitious composites [6–8].
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