Development of advanced techniques for damage detection using phased-array UT and SMArt thermography

 

Phased-array UT probes consists of an array of ultrasonic probes that can be used for the control of a structural element. The redundancy of active UT probes and the possibility to change the parameters of measurement (e.g. number of element, angle of the beam, etc) allow a better resolution of the detected damages and an easier interpretation of measurements.

However, the potentiality of these probes is not well known in industry, and a calibration is generally required. SMArt thermography exploits the electro-thermal properties of multifunctional smart structures, which are created by embedding shape memory alloy (SMA) wires in traditional carbon or glass fibre reinforced composite laminates (known as SMArt composites), in order to detect the structural flaws using an embedded source. Such a system enables a built-in, fast, cost-effective and in-depth assessment of the structural damage as it overcomes the limitations of standard thermography techniques.

In this WP a panel with embedded SMA wires and FBG sensors will be built and used for the calibration of the two techniques. Finally, the special case of defects induced by damage detection transducers embedded in the structural part will be studied, especially in case of fatigue related problems.

Experimental fatigue test on specimen with embedded sensors

 

In this WP several specimen with embedded sensors like FBG or SMA wires will be loaded in fatigue. Sensor will be used to perform a continuous monitoring of the material, trying to relate damage phenomena induced by fatigue to change of measurement evaluated by Stuctural Health Monitoring system.