ACOUSTIC EMISSION MONITORING OF FRACTURE OF TRC CURVED STRUCTURAL PLATES

Acoustic emission (AE) is commonly applied for structural evaluation of materials. It uses piezoelectric sensors to detect elastic waves coming from failure processes within the material. Concerning textile reinforced cementitious (TRC) plates, AE parameters have proven their potential to characterize not only the location and the fracture mode of defects but also the developing strain field before visible damage evolves. Matrix cracking events create short elastic signals with high frequencies whereas debonding between layers or fiber pull-out results in longer signals of lower frequency. However, the wave propagation path, plate wave dispersion and heterogeneity result in attenuation and distortion of the signal. These factors change the received AE parameters and therefore, complicate the evaluation especially for large sample dimensions. In this study, curved textile reinforced cement plates with different widths are loaded in bending with concurrent AE monitoring. The aim is to evaluate if damage characterization based on small laboratory specimens can be upgraded to larger scales and different geometries.

Jaar van publicatie:2021