Nondestructive tests, commonly employed in rock mechanics, estimate mechanical parameters without affecting the rocks situ properties. This study evaluates non-destructive tests (ultrasonic pulse velocity and Schmidt hammer) for forecasting strength physical properties of used rocks. Weathering grades moisture content are provided as variables that produce variances both tests. The coefficient ...

The performance of an ultrasonic flaw detection system is valued by its success in differentiating flaw echoes from those scattered by microstructures (e.g. grain scattering or clutter). In order to successfully detect and classify the target echoes from background noise, an effective feature extracting method and a robust decision process are required. In this study, we present a comparative e...

Continuous ultrasonic in-situ monitoring for industrial applications is difficult owing to the high operating temperatures in industrial fields. It is expected that ultrasonic transducers consisting of a CaBi₄Ti₄O15(CBT)/Pb(Zr,Ti)O₃(PZT) sol-gel composite could be one solution for ultrasonic nondestructive testing (NDT) above 500 °C because no couplant is required and CBT has a high Curie tempe...

Coatings play a crucial role in protecting ships and marine structures from corrosion extending their service life. The reliability of these coatings depends on proper maintenance, which turn, relies the application reliable diagnostic techniques. Non-destructive testing (NDT) techniques are useful material diagnostics, such as detecting debonded zone water. However, challenging access environm...

Ultrasonic guided waves are used to detect the delamination between skin and honeycomb of a composite helicopter rotor blade. Theoretical work is carried out for guided waves in the trailing edge of a rotor blade, which is a multilayer composite skin/NOMEX half space structure. The dispersion relation is obtained with the global matrix method. Theoretically driven experiments are conducted on a...